diff --git a/java/src/com/android/inputmethod/latin/DictionaryFacilitatorForSuggest.java b/java/src/com/android/inputmethod/latin/DictionaryFacilitatorForSuggest.java
index d6178fc..8b8d577 100644
--- a/java/src/com/android/inputmethod/latin/DictionaryFacilitatorForSuggest.java
+++ b/java/src/com/android/inputmethod/latin/DictionaryFacilitatorForSuggest.java
@@ -26,15 +26,14 @@
 import com.android.inputmethod.latin.personalization.PersonalizationDictionary;
 import com.android.inputmethod.latin.personalization.PersonalizationHelper;
 import com.android.inputmethod.latin.personalization.UserHistoryDictionary;
-import com.android.inputmethod.latin.settings.SettingsValues;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.ExecutorUtils;
 import com.android.inputmethod.latin.utils.LanguageModelParam;
+import com.android.inputmethod.latin.utils.SuggestionResults;
 
 import java.io.File;
 import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
@@ -50,197 +49,314 @@
     // dictionary.
     private static final int CAPITALIZED_FORM_MAX_PROBABILITY_FOR_INSERT = 140;
 
-    private final Context mContext;
-    public final Locale mLocale;
+    private Dictionaries mDictionaries = new Dictionaries();
+    private volatile CountDownLatch mLatchForWaitingLoadingMainDictionary = new CountDownLatch(0);
+    // To synchronize assigning mDictionaries to ensure closing dictionaries.
+    private Object mLock = new Object();
 
-    private final ConcurrentHashMap<String, Dictionary> mDictionaries =
-            CollectionUtils.newConcurrentHashMap();
+    /**
+     * Class contains dictionaries for a locale.
+     */
+    private static class Dictionaries {
+        public final Locale mLocale;
+        public final ConcurrentHashMap<String, Dictionary> mDictMap =
+                CollectionUtils.newConcurrentHashMap();
+        // Main dictionary will be asynchronously loaded.
+        public Dictionary mMainDictionary;
+        public final ContactsBinaryDictionary mContactsDictionary;
+        public final UserBinaryDictionary mUserDictionary;
+        public final UserHistoryDictionary mUserHistoryDictionary;
+        public final PersonalizationDictionary mPersonalizationDictionary;
 
-    private Dictionary mMainDictionary;
-    private ContactsBinaryDictionary mContactsDictionary;
-    private UserBinaryDictionary mUserDictionary;
-    private UserHistoryDictionary mUserHistoryDictionary;
-    private PersonalizationDictionary mPersonalizationDictionary;
+        public Dictionaries() {
+            mLocale = null;
+            mMainDictionary = null;
+            mContactsDictionary = null;
+            mUserDictionary = null;
+            mUserHistoryDictionary = null;
+            mPersonalizationDictionary = null;
+        }
 
-    private final CountDownLatch mLatchForWaitingLoadingMainDictionary;
+        public Dictionaries(final Locale locale, final Dictionary mainDict,
+            final ContactsBinaryDictionary contactsDict, final UserBinaryDictionary userDict,
+            final UserHistoryDictionary userHistoryDict,
+            final PersonalizationDictionary personalizationDict) {
+            mLocale = locale;
+            setMainDict(mainDict);
+            mContactsDictionary = contactsDict;
+            if (mContactsDictionary != null) {
+                mDictMap.put(Dictionary.TYPE_CONTACTS, mContactsDictionary);
+            }
+            mUserDictionary = userDict;
+            if (mUserDictionary != null) {
+                mDictMap.put(Dictionary.TYPE_USER, mUserDictionary);
+            }
+            mUserHistoryDictionary = userHistoryDict;
+            if (mUserHistoryDictionary != null) {
+                mDictMap.put(Dictionary.TYPE_USER_HISTORY, mUserHistoryDictionary);
+            }
+            mPersonalizationDictionary = personalizationDict;
+            if (mPersonalizationDictionary != null) {
+                mDictMap.put(Dictionary.TYPE_PERSONALIZATION, mPersonalizationDictionary);
+            }
+        }
+
+        public void setMainDict(final Dictionary mainDict) {
+            mMainDictionary = mainDict;
+            // Close old dictionary if exists. Main dictionary can be assigned multiple times.
+            final Dictionary oldDict;
+            if (mMainDictionary != null) {
+                oldDict = mDictMap.put(Dictionary.TYPE_MAIN, mMainDictionary);
+            } else {
+                oldDict = mDictMap.remove(Dictionary.TYPE_MAIN);
+            }
+            if (oldDict != null && mMainDictionary != oldDict) {
+                oldDict.close();
+            }
+        }
+
+        public boolean hasMainDict() {
+            return mMainDictionary != null;
+        }
+
+        public boolean hasContactsDict() {
+            return mContactsDictionary != null;
+        }
+
+        public boolean hasUserDict() {
+            return mUserDictionary != null;
+        }
+
+        public boolean hasUserHistoryDict() {
+            return mUserHistoryDictionary != null;
+        }
+
+        public boolean hasPersonalizationDict() {
+            return mPersonalizationDictionary != null;
+        }
+    }
 
     public interface DictionaryInitializationListener {
         public void onUpdateMainDictionaryAvailability(boolean isMainDictionaryAvailable);
     }
 
-    /**
-     * Creates instance for initialization or when the locale is changed.
-     *
-     * @param context the context
-     * @param locale the locale
-     * @param settingsValues current settings values to control what dictionaries should be used
-     * @param listener the listener
-     * @param oldDictionaryFacilitator the instance having old dictionaries. This is null when the
-     * instance is initially created.
-     */
-    public DictionaryFacilitatorForSuggest(final Context context, final Locale locale,
-            final SettingsValues settingsValues, final DictionaryInitializationListener listener,
-            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator) {
-        mContext = context;
-        mLocale = locale;
-        mLatchForWaitingLoadingMainDictionary = new CountDownLatch(1);
-        loadMainDict(context, locale, listener);
-        setUserDictionary(new UserBinaryDictionary(context, locale));
-        resetAdditionalDictionaries(oldDictionaryFacilitator, settingsValues);
+    public DictionaryFacilitatorForSuggest() {}
+
+    public Locale getLocale() {
+        return mDictionaries.mLocale;
     }
 
-    /**
-     * Creates instance for reloading the main dict.
-     *
-     * @param listener the listener
-     * @param oldDictionaryFacilitator the instance having old dictionaries. This must not be null.
-     */
-    public DictionaryFacilitatorForSuggest(final DictionaryInitializationListener listener,
-            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator) {
-        mContext = oldDictionaryFacilitator.mContext;
-        mLocale = oldDictionaryFacilitator.mLocale;
-        mLatchForWaitingLoadingMainDictionary = new CountDownLatch(1);
-        loadMainDict(mContext, mLocale, listener);
-        // Transfer user dictionary.
-        setUserDictionary(oldDictionaryFacilitator.mUserDictionary);
-        oldDictionaryFacilitator.removeDictionary(Dictionary.TYPE_USER);
-        // Transfer contacts dictionary.
-        setContactsDictionary(oldDictionaryFacilitator.mContactsDictionary);
-        oldDictionaryFacilitator.removeDictionary(Dictionary.TYPE_CONTACTS);
-        // Transfer user history dictionary.
-        setUserHistoryDictionary(oldDictionaryFacilitator.mUserHistoryDictionary);
-        oldDictionaryFacilitator.removeDictionary(Dictionary.TYPE_USER_HISTORY);
-        // Transfer personalization dictionary.
-        setPersonalizationDictionary(oldDictionaryFacilitator.mPersonalizationDictionary);
-        oldDictionaryFacilitator.removeDictionary(Dictionary.TYPE_PERSONALIZATION);
+    public void resetDictionaries(final Context context, final Locale newLocale,
+            final boolean useContactsDict, final boolean usePersonalizedDicts,
+            final boolean forceReloadMainDictionary,
+            final DictionaryInitializationListener listener) {
+        final boolean localeHasBeenChanged = !newLocale.equals(mDictionaries.mLocale);
+        // We always try to have the main dictionary. Other dictionaries can be unused.
+        final boolean reloadMainDictionary = localeHasBeenChanged || forceReloadMainDictionary;
+        final boolean closeContactsDictionary = localeHasBeenChanged || !useContactsDict;
+        final boolean closeUserDictionary = localeHasBeenChanged;
+        final boolean closeUserHistoryDictionary = localeHasBeenChanged || !usePersonalizedDicts;
+        final boolean closePersonalizationDictionary =
+                localeHasBeenChanged || !usePersonalizedDicts;
+
+        final Dictionary newMainDict;
+        if (reloadMainDictionary) {
+            // The main dictionary will be asynchronously loaded.
+            newMainDict = null;
+        } else {
+            newMainDict = mDictionaries.mMainDictionary;
+        }
+
+        // Open or move contacts dictionary.
+        final ContactsBinaryDictionary newContactsDict;
+        if (!closeContactsDictionary && mDictionaries.hasContactsDict()) {
+            newContactsDict = mDictionaries.mContactsDictionary;
+        } else if (useContactsDict) {
+            newContactsDict = new ContactsBinaryDictionary(context, newLocale);
+        } else {
+            newContactsDict = null;
+        }
+
+        // Open or move user dictionary.
+        final UserBinaryDictionary newUserDictionary;
+        if (!closeUserDictionary && mDictionaries.hasUserDict()) {
+            newUserDictionary = mDictionaries.mUserDictionary;
+        } else {
+            newUserDictionary = new UserBinaryDictionary(context, newLocale);
+        }
+
+        // Open or move user history dictionary.
+        final UserHistoryDictionary newUserHistoryDict;
+        if (!closeUserHistoryDictionary && mDictionaries.hasUserHistoryDict()) {
+            newUserHistoryDict = mDictionaries.mUserHistoryDictionary;
+        } else if (usePersonalizedDicts) {
+            newUserHistoryDict = PersonalizationHelper.getUserHistoryDictionary(context, newLocale);
+        } else {
+            newUserHistoryDict = null;
+        }
+
+        // Open or move personalization dictionary.
+        final PersonalizationDictionary newPersonalizationDict;
+        if (!closePersonalizationDictionary && mDictionaries.hasPersonalizationDict()) {
+            newPersonalizationDict = mDictionaries.mPersonalizationDictionary;
+        } else if (usePersonalizedDicts) {
+            newPersonalizationDict =
+                    PersonalizationHelper.getPersonalizationDictionary(context, newLocale);
+        } else {
+            newPersonalizationDict = null;
+        }
+
+        // Replace Dictionaries.
+        final Dictionaries newDictionaries = new Dictionaries(newLocale, newMainDict,
+                newContactsDict,  newUserDictionary, newUserHistoryDict, newPersonalizationDict);
+        if (listener != null) {
+            listener.onUpdateMainDictionaryAvailability(newDictionaries.hasMainDict());
+        }
+        final Dictionaries oldDictionaries;
+        synchronized (mLock) {
+            oldDictionaries = mDictionaries;
+            mDictionaries = newDictionaries;
+            if (reloadMainDictionary) {
+                asyncReloadMainDictionary(context, newLocale, listener);
+            }
+        }
+
+        // Clean up old dictionaries.
+        oldDictionaries.mDictMap.clear();
+        if (reloadMainDictionary && oldDictionaries.hasMainDict()) {
+            oldDictionaries.mMainDictionary.close();
+        }
+        if (closeContactsDictionary && oldDictionaries.hasContactsDict()) {
+            oldDictionaries.mContactsDictionary.close();
+        }
+        if (closeUserDictionary && oldDictionaries.hasUserDict()) {
+            oldDictionaries.mUserDictionary.close();
+        }
+        if (closeUserHistoryDictionary && oldDictionaries.hasUserHistoryDict()) {
+            oldDictionaries.mUserHistoryDictionary.close();
+        }
+        if (closePersonalizationDictionary && oldDictionaries.hasPersonalizationDict()) {
+            oldDictionaries.mPersonalizationDictionary.close();
+        }
     }
 
-    /**
-     * Creates instance for when the settings values have been changed.
-     *
-     * @param settingsValues the new settings values
-     * @param oldDictionaryFacilitator the instance having old dictionaries. This must not be null.
-     */
-    //
-    public DictionaryFacilitatorForSuggest(final SettingsValues settingsValues,
-            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator) {
-        mContext = oldDictionaryFacilitator.mContext;
-        mLocale = oldDictionaryFacilitator.mLocale;
-        mLatchForWaitingLoadingMainDictionary = new CountDownLatch(0);
-        // Transfer main dictionary.
-        setMainDictionary(oldDictionaryFacilitator.mMainDictionary);
-        oldDictionaryFacilitator.removeDictionary(Dictionary.TYPE_MAIN);
-        // Transfer user dictionary.
-        setUserDictionary(oldDictionaryFacilitator.mUserDictionary);
-        oldDictionaryFacilitator.removeDictionary(Dictionary.TYPE_USER);
-        // Transfer or create additional dictionaries depending on the settings values.
-        resetAdditionalDictionaries(oldDictionaryFacilitator, settingsValues);
+    private void asyncReloadMainDictionary(final Context context, final Locale locale,
+            final DictionaryInitializationListener listener) {
+        final CountDownLatch latchForWaitingLoadingMainDictionary = new CountDownLatch(1);
+        mLatchForWaitingLoadingMainDictionary = latchForWaitingLoadingMainDictionary;
+        ExecutorUtils.getExecutor("InitializeBinaryDictionary").execute(new Runnable() {
+            @Override
+            public void run() {
+                final Dictionary mainDict =
+                        DictionaryFactory.createMainDictionaryFromManager(context, locale);
+                synchronized (mLock) {
+                    if (locale.equals(mDictionaries.mLocale)) {
+                        mDictionaries.setMainDict(mainDict);
+                    } else {
+                        // Dictionary facilitator has been reset for another locale.
+                        mainDict.close();
+                    }
+                }
+                if (listener != null) {
+                    listener.onUpdateMainDictionaryAvailability(mDictionaries.hasMainDict());
+                }
+                latchForWaitingLoadingMainDictionary.countDown();
+            }
+        });
     }
 
     @UsedForTesting
-    public DictionaryFacilitatorForSuggest(final Context context, final Locale locale,
+    public void resetDictionariesForTesting(final Context context, final Locale locale,
             final ArrayList<String> dictionaryTypes, final HashMap<String, File> dictionaryFiles,
             final Map<String, Map<String, String>> additionalDictAttributes) {
-        mContext = context;
-        mLocale = locale;
-        mLatchForWaitingLoadingMainDictionary = new CountDownLatch(0);
+        Dictionary mainDictionary = null;
+        ContactsBinaryDictionary contactsDictionary = null;
+        UserBinaryDictionary userDictionary = null;
+        UserHistoryDictionary userHistoryDictionary = null;
+        PersonalizationDictionary personalizationDictionary = null;
+
         for (final String dictType : dictionaryTypes) {
             if (dictType.equals(Dictionary.TYPE_MAIN)) {
-                final DictionaryCollection mainDictionary =
-                        DictionaryFactory.createMainDictionaryFromManager(context, locale);
-                setMainDictionary(mainDictionary);
+                mainDictionary = DictionaryFactory.createMainDictionaryFromManager(context, locale);
             } else if (dictType.equals(Dictionary.TYPE_USER_HISTORY)) {
-                final UserHistoryDictionary userHistoryDictionary =
+                userHistoryDictionary =
                         PersonalizationHelper.getUserHistoryDictionary(context, locale);
                 // Staring with an empty user history dictionary for testing.
                 // Testing program may populate this dictionary before actual testing.
                 userHistoryDictionary.reloadDictionaryIfRequired();
                 userHistoryDictionary.waitAllTasksForTests();
-                setUserHistoryDictionary(userHistoryDictionary);
                 if (additionalDictAttributes.containsKey(dictType)) {
                     userHistoryDictionary.clearAndFlushDictionaryWithAdditionalAttributes(
                             additionalDictAttributes.get(dictType));
                 }
             } else if (dictType.equals(Dictionary.TYPE_PERSONALIZATION)) {
-                final PersonalizationDictionary personalizationDictionary =
+                personalizationDictionary =
                         PersonalizationHelper.getPersonalizationDictionary(context, locale);
                 // Staring with an empty personalization dictionary for testing.
                 // Testing program may populate this dictionary before actual testing.
                 personalizationDictionary.reloadDictionaryIfRequired();
                 personalizationDictionary.waitAllTasksForTests();
-                setPersonalizationDictionary(personalizationDictionary);
                 if (additionalDictAttributes.containsKey(dictType)) {
                     personalizationDictionary.clearAndFlushDictionaryWithAdditionalAttributes(
                             additionalDictAttributes.get(dictType));
                 }
             } else if (dictType.equals(Dictionary.TYPE_USER)) {
                 final File file = dictionaryFiles.get(dictType);
-                final UserBinaryDictionary userDictionary = new UserBinaryDictionary(
-                        context, locale, file);
+                userDictionary = new UserBinaryDictionary(context, locale, file);
                 userDictionary.reloadDictionaryIfRequired();
                 userDictionary.waitAllTasksForTests();
-                setUserDictionary(userDictionary);
             } else if (dictType.equals(Dictionary.TYPE_CONTACTS)) {
                 final File file = dictionaryFiles.get(dictType);
-                final ContactsBinaryDictionary contactsDictionary = new ContactsBinaryDictionary(
-                        context, locale, file);
+                contactsDictionary = new ContactsBinaryDictionary(context, locale, file);
                 contactsDictionary.reloadDictionaryIfRequired();
                 contactsDictionary.waitAllTasksForTests();
-                setContactsDictionary(contactsDictionary);
             } else {
                 throw new RuntimeException("Unknown dictionary type: " + dictType);
             }
         }
+        mDictionaries = new Dictionaries(locale, mainDictionary, contactsDictionary,
+                userDictionary, userHistoryDictionary, personalizationDictionary);
     }
 
-    public boolean needsToBeRecreated(final Locale newLocale,
-            final SettingsValues newSettingsValues) {
-        return !mLocale.equals(newLocale)
-                || (newSettingsValues.mUseContactsDict != (mContactsDictionary != null))
-                || (newSettingsValues.mUsePersonalizedDicts != (mUserHistoryDictionary != null))
-                || (newSettingsValues.mUsePersonalizedDicts != hasPersonalizationDictionary());
-    }
-
-    public void close() {
-        final HashSet<Dictionary> dictionaries = CollectionUtils.newHashSet();
-        dictionaries.addAll(mDictionaries.values());
-        for (final Dictionary dictionary : dictionaries) {
-            dictionary.close();
+    public void closeDictionaries() {
+        final Dictionaries dictionaries;
+        synchronized (mLock) {
+            dictionaries = mDictionaries;
+            mDictionaries = new Dictionaries();
         }
-    }
-
-    private void loadMainDict(final Context context, final Locale locale,
-            final DictionaryInitializationListener listener) {
-        mMainDictionary = null;
-        if (listener != null) {
-            listener.onUpdateMainDictionaryAvailability(hasMainDictionary());
+        if (dictionaries.hasMainDict()) {
+            dictionaries.mMainDictionary.close();
         }
-        ExecutorUtils.getExecutor("InitializeBinaryDictionary").execute(new Runnable() {
-            public void run() {
-                final DictionaryCollection newMainDict =
-                        DictionaryFactory.createMainDictionaryFromManager(context, locale);
-                setMainDictionary(newMainDict);
-                if (listener != null) {
-                    listener.onUpdateMainDictionaryAvailability(hasMainDictionary());
-                }
-                mLatchForWaitingLoadingMainDictionary.countDown();
-            }
-        });
+        if (dictionaries.hasContactsDict()) {
+            dictionaries.mContactsDictionary.close();
+        }
+        if (dictionaries.hasUserDict()) {
+            dictionaries.mUserDictionary.close();
+        }
+        if (dictionaries.hasUserHistoryDict()) {
+            dictionaries.mUserHistoryDictionary.close();
+        }
+        if (dictionaries.hasPersonalizationDict()) {
+            dictionaries.mPersonalizationDictionary.close();
+        }
     }
 
     // The main dictionary could have been loaded asynchronously.  Don't cache the return value
     // of this method.
-    public boolean hasMainDictionary() {
-        return null != mMainDictionary && mMainDictionary.isInitialized();
+    public boolean hasInitializedMainDictionary() {
+        final Dictionaries dictionaries = mDictionaries;
+        return dictionaries.hasMainDict() && dictionaries.mMainDictionary.isInitialized();
     }
 
     public boolean hasPersonalizationDictionary() {
-        return null != mPersonalizationDictionary;
+        return mDictionaries.hasPersonalizationDict();
     }
 
     public void flushPersonalizationDictionary() {
-        if (hasPersonalizationDictionary()) {
-            mPersonalizationDictionary.flush();
+        final PersonalizationDictionary personalizationDict =
+                mDictionaries.mPersonalizationDictionary;
+        if (personalizationDict != null) {
+            personalizationDict.flush();
         }
     }
 
@@ -253,177 +369,48 @@
     public void waitForLoadingDictionariesForTesting(final long timeout, final TimeUnit unit)
             throws InterruptedException {
         waitForLoadingMainDictionary(timeout, unit);
-        if (mContactsDictionary != null) {
-            mContactsDictionary.waitAllTasksForTests();
+        final Dictionaries dictionaries = mDictionaries;
+        if (dictionaries.hasContactsDict()) {
+            dictionaries.mContactsDictionary.waitAllTasksForTests();
         }
-        if (mUserDictionary != null) {
-            mUserDictionary.waitAllTasksForTests();
+        if (dictionaries.hasUserDict()) {
+            dictionaries.mUserDictionary.waitAllTasksForTests();
         }
-        if (mUserHistoryDictionary != null) {
-            mUserHistoryDictionary.waitAllTasksForTests();
+        if (dictionaries.hasUserHistoryDict()) {
+            dictionaries.mUserHistoryDictionary.waitAllTasksForTests();
         }
-        if (mPersonalizationDictionary != null) {
-            mPersonalizationDictionary.waitAllTasksForTests();
+        if (dictionaries.hasPersonalizationDict()) {
+            dictionaries.mPersonalizationDictionary.waitAllTasksForTests();
         }
     }
 
-    private void setMainDictionary(final Dictionary mainDictionary) {
-        mMainDictionary = mainDictionary;
-        addOrReplaceDictionary(Dictionary.TYPE_MAIN, mainDictionary);
-    }
-
-    /**
-     * Sets an optional user dictionary resource to be loaded. The user dictionary is consulted
-     * before the main dictionary, if set. This refers to the system-managed user dictionary.
-     */
-    private void setUserDictionary(final UserBinaryDictionary userDictionary) {
-        mUserDictionary = userDictionary;
-        addOrReplaceDictionary(Dictionary.TYPE_USER, userDictionary);
-    }
-
-    /**
-     * Sets an optional contacts dictionary resource to be loaded. It is also possible to remove
-     * the contacts dictionary by passing null to this method. In this case no contacts dictionary
-     * won't be used.
-     */
-    private void setContactsDictionary(final ContactsBinaryDictionary contactsDictionary) {
-        mContactsDictionary = contactsDictionary;
-        addOrReplaceDictionary(Dictionary.TYPE_CONTACTS, contactsDictionary);
-    }
-
-    private void setUserHistoryDictionary(final UserHistoryDictionary userHistoryDictionary) {
-        mUserHistoryDictionary = userHistoryDictionary;
-        addOrReplaceDictionary(Dictionary.TYPE_USER_HISTORY, userHistoryDictionary);
-    }
-
-    private void setPersonalizationDictionary(
-            final PersonalizationDictionary personalizationDictionary) {
-        mPersonalizationDictionary = personalizationDictionary;
-        addOrReplaceDictionary(Dictionary.TYPE_PERSONALIZATION, personalizationDictionary);
-    }
-
-    /**
-     * Reset dictionaries that can be turned off according to the user settings.
-     *
-     * @param oldDictionaryFacilitator the instance having old dictionaries
-     * @param settingsValues current SettingsValues
-     */
-    private void resetAdditionalDictionaries(
-            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator,
-            final SettingsValues settingsValues) {
-        // Contacts dictionary
-        resetContactsDictionary(null != oldDictionaryFacilitator ?
-                oldDictionaryFacilitator.mContactsDictionary : null, settingsValues);
-        // User history dictionary & Personalization dictionary
-        resetPersonalizedDictionaries(oldDictionaryFacilitator, settingsValues);
-    }
-
-    /**
-     * Set the user history dictionary and personalization dictionary according to the user
-     * settings.
-     *
-     * @param oldDictionaryFacilitator the instance that has been used
-     * @param settingsValues current settingsValues
-     */
-    // TODO: Consolidate resetPersonalizedDictionaries() and resetContactsDictionary(). Call up the
-    // new method for each dictionary.
-    private void resetPersonalizedDictionaries(
-            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator,
-            final SettingsValues settingsValues) {
-        final boolean shouldSetDictionaries = settingsValues.mUsePersonalizedDicts;
-
-        final UserHistoryDictionary oldUserHistoryDictionary = (null == oldDictionaryFacilitator) ?
-                null : oldDictionaryFacilitator.mUserHistoryDictionary;
-        final PersonalizationDictionary oldPersonalizationDictionary =
-                (null == oldDictionaryFacilitator) ? null :
-                        oldDictionaryFacilitator.mPersonalizationDictionary;
-        final UserHistoryDictionary userHistoryDictionaryToUse;
-        final PersonalizationDictionary personalizationDictionaryToUse;
-        if (!shouldSetDictionaries) {
-            userHistoryDictionaryToUse = null;
-            personalizationDictionaryToUse = null;
-        } else {
-            if (null != oldUserHistoryDictionary
-                    && oldUserHistoryDictionary.mLocale.equals(mLocale)) {
-                userHistoryDictionaryToUse = oldUserHistoryDictionary;
-            } else {
-                userHistoryDictionaryToUse =
-                        PersonalizationHelper.getUserHistoryDictionary(mContext, mLocale);
-            }
-            if (null != oldPersonalizationDictionary
-                    && oldPersonalizationDictionary.mLocale.equals(mLocale)) {
-                personalizationDictionaryToUse = oldPersonalizationDictionary;
-            } else {
-                personalizationDictionaryToUse =
-                        PersonalizationHelper.getPersonalizationDictionary(mContext, mLocale);
-            }
-        }
-        setUserHistoryDictionary(userHistoryDictionaryToUse);
-        setPersonalizationDictionary(personalizationDictionaryToUse);
-    }
-
-    /**
-     * Set the contacts dictionary according to the user settings.
-     *
-     * This method takes an optional contacts dictionary to use when the locale hasn't changed
-     * since the contacts dictionary can be opened or closed as necessary depending on the settings.
-     *
-     * @param oldContactsDictionary an optional dictionary to use, or null
-     * @param settingsValues current settingsValues
-     */
-    private void resetContactsDictionary(final ContactsBinaryDictionary oldContactsDictionary,
-            final SettingsValues settingsValues) {
-        final boolean shouldSetDictionary = settingsValues.mUseContactsDict;
-        final ContactsBinaryDictionary dictionaryToUse;
-        if (!shouldSetDictionary) {
-            // Make sure the dictionary is closed. If it is already closed, this is a no-op,
-            // so it's safe to call it anyways.
-            if (null != oldContactsDictionary) oldContactsDictionary.close();
-            dictionaryToUse = null;
-        } else {
-            if (null != oldContactsDictionary) {
-                if (!oldContactsDictionary.mLocale.equals(mLocale)) {
-                    // If the locale has changed then recreate the contacts dictionary. This
-                    // allows locale dependent rules for handling bigram name predictions.
-                    oldContactsDictionary.close();
-                    dictionaryToUse = new ContactsBinaryDictionary(mContext, mLocale);
-                } else {
-                    // Make sure the old contacts dictionary is opened. If it is already open,
-                    // this is a no-op, so it's safe to call it anyways.
-                    oldContactsDictionary.reopen(mContext);
-                    dictionaryToUse = oldContactsDictionary;
-                }
-            } else {
-                dictionaryToUse = new ContactsBinaryDictionary(mContext, mLocale);
-            }
-        }
-        setContactsDictionary(dictionaryToUse);
-    }
-
     public boolean isUserDictionaryEnabled() {
-        if (mUserDictionary == null) {
+        final UserBinaryDictionary userDictionary = mDictionaries.mUserDictionary;
+        if (userDictionary == null) {
             return false;
         }
-        return mUserDictionary.mEnabled;
+        return userDictionary.mEnabled;
     }
 
     public void addWordToUserDictionary(String word) {
-        if (mUserDictionary == null) {
+        final UserBinaryDictionary userDictionary = mDictionaries.mUserDictionary;
+        if (userDictionary == null) {
             return;
         }
-        mUserDictionary.addWordToUserDictionary(word);
+        userDictionary.addWordToUserDictionary(word);
     }
 
     public void addToUserHistory(final String suggestion, final boolean wasAutoCapitalized,
             final String previousWord, final int timeStampInSeconds) {
-        if (mUserHistoryDictionary == null) {
+        final Dictionaries dictionaries = mDictionaries;
+        if (!dictionaries.hasUserHistoryDict()) {
             return;
         }
         final int maxFreq = getMaxFrequency(suggestion);
         if (maxFreq == 0) {
             return;
         }
-        final String suggestionLowerCase = suggestion.toLowerCase(mLocale);
+        final String suggestionLowerCase = suggestion.toLowerCase(dictionaries.mLocale);
         final String secondWord;
         if (wasAutoCapitalized) {
             secondWord = suggestionLowerCase;
@@ -432,11 +419,11 @@
             // History dictionary in order to avoid suggesting them until the dictionary
             // consolidation is done.
             // TODO: Remove this hack when ready.
-            final int lowerCasefreqInMainDict = mMainDictionary != null ?
-                    mMainDictionary.getFrequency(suggestionLowerCase) :
+            final int lowerCaseFreqInMainDict = dictionaries.hasMainDict() ?
+                    dictionaries.mMainDictionary.getFrequency(suggestionLowerCase) :
                             Dictionary.NOT_A_PROBABILITY;
-            if (maxFreq < lowerCasefreqInMainDict
-                    && lowerCasefreqInMainDict >= CAPITALIZED_FORM_MAX_PROBABILITY_FOR_INSERT) {
+            if (maxFreq < lowerCaseFreqInMainDict
+                    && lowerCaseFreqInMainDict >= CAPITALIZED_FORM_MAX_PROBABILITY_FOR_INSERT) {
                 // Use lower cased word as the word can be a distracter of the popular word.
                 secondWord = suggestionLowerCase;
             } else {
@@ -446,54 +433,56 @@
         // We demote unrecognized words (frequency < 0, below) by specifying them as "invalid".
         // We don't add words with 0-frequency (assuming they would be profanity etc.).
         final boolean isValid = maxFreq > 0;
-        mUserHistoryDictionary.addToDictionary(
+        dictionaries.mUserHistoryDictionary.addToDictionary(
                 previousWord, secondWord, isValid, timeStampInSeconds);
     }
 
     public void cancelAddingUserHistory(final String previousWord, final String committedWord) {
-        if (mUserHistoryDictionary != null) {
-            mUserHistoryDictionary.cancelAddingUserHistory(previousWord, committedWord);
+        final UserHistoryDictionary userHistoryDictionary = mDictionaries.mUserHistoryDictionary;
+        if (userHistoryDictionary != null) {
+            userHistoryDictionary.cancelAddingUserHistory(previousWord, committedWord);
         }
     }
 
     // TODO: Revise the way to fusion suggestion results.
-    public void getSuggestions(final WordComposer composer,
+    public SuggestionResults getSuggestionResults(final WordComposer composer,
             final String prevWord, final ProximityInfo proximityInfo,
             final boolean blockOffensiveWords, final int[] additionalFeaturesOptions,
-            final int sessionId, final Set<SuggestedWordInfo> suggestionSet,
-            final ArrayList<SuggestedWordInfo> rawSuggestions) {
-        for (final String key : mDictionaries.keySet()) {
-            final Dictionary dictionary = mDictionaries.get(key);
+            final int sessionId, final ArrayList<SuggestedWordInfo> rawSuggestions) {
+        final Dictionaries dictionaries = mDictionaries;
+        final Map<String, Dictionary> dictMap = dictionaries.mDictMap;
+        final SuggestionResults suggestionResults =
+                new SuggestionResults(dictionaries.mLocale, SuggestedWords.MAX_SUGGESTIONS);
+        for (final Dictionary dictionary : dictMap.values()) {
             if (null == dictionary) continue;
             final ArrayList<SuggestedWordInfo> dictionarySuggestions =
                     dictionary.getSuggestionsWithSessionId(composer, prevWord, proximityInfo,
                             blockOffensiveWords, additionalFeaturesOptions, sessionId);
             if (null == dictionarySuggestions) continue;
-            suggestionSet.addAll(dictionarySuggestions);
+            suggestionResults.addAll(dictionarySuggestions);
             if (null != rawSuggestions) {
                 rawSuggestions.addAll(dictionarySuggestions);
             }
         }
+        return suggestionResults;
     }
 
     public boolean isValidMainDictWord(final String word) {
-        if (TextUtils.isEmpty(word) || !hasMainDictionary()) {
+        final Dictionaries dictionaries = mDictionaries;
+        if (TextUtils.isEmpty(word) || !dictionaries.hasMainDict()) {
             return false;
         }
-        return mMainDictionary.isValidWord(word);
+        return dictionaries.mMainDictionary.isValidWord(word);
     }
 
     public boolean isValidWord(final String word, final boolean ignoreCase) {
         if (TextUtils.isEmpty(word)) {
             return false;
         }
-        final String lowerCasedWord = word.toLowerCase(mLocale);
-        for (final String key : mDictionaries.keySet()) {
-            final Dictionary dictionary = mDictionaries.get(key);
-            // It's unclear how realistically 'dictionary' can be null, but the monkey is somehow
-            // managing to get null in here. Presumably the language is changing to a language with
-            // no main dictionary and the monkey manages to type a whole word before the thread
-            // that reads the dictionary is started or something?
+        final Dictionaries dictionaries = mDictionaries;
+        final String lowerCasedWord = word.toLowerCase(dictionaries.mLocale);
+        final Map<String, Dictionary> dictMap = dictionaries.mDictMap;
+        for (final Dictionary dictionary : dictMap.values()) {
             // Ideally the passed map would come out of a {@link java.util.concurrent.Future} and
             // would be immutable once it's finished initializing, but concretely a null test is
             // probably good enough for the time being.
@@ -511,9 +500,8 @@
             return Dictionary.NOT_A_PROBABILITY;
         }
         int maxFreq = -1;
-        for (final String key : mDictionaries.keySet()) {
-            final Dictionary dictionary = mDictionaries.get(key);
-            if (null == dictionary) continue;
+        final Map<String, Dictionary> dictMap = mDictionaries.mDictMap;
+        for (final Dictionary dictionary : dictMap.values()) {
             final int tempFreq = dictionary.getFrequency(word);
             if (tempFreq >= maxFreq) {
                 maxFreq = tempFreq;
@@ -522,61 +510,50 @@
         return maxFreq;
     }
 
-    private void removeDictionary(final String key) {
-        mDictionaries.remove(key);
-    }
-
-    private void addOrReplaceDictionary(final String key, final Dictionary dict) {
-        final Dictionary oldDict;
-        if (dict == null) {
-            oldDict = mDictionaries.remove(key);
-        } else {
-            oldDict = mDictionaries.put(key, dict);
-        }
-        if (oldDict != null && dict != oldDict) {
-            oldDict.close();
-        }
-    }
 
     public void clearUserHistoryDictionary() {
-        if (mUserHistoryDictionary == null) {
+        final UserHistoryDictionary userHistoryDict = mDictionaries.mUserHistoryDictionary;
+        if (userHistoryDict == null) {
             return;
         }
-        mUserHistoryDictionary.clearAndFlushDictionary();
+        userHistoryDict.clearAndFlushDictionary();
     }
 
     // This method gets called only when the IME receives a notification to remove the
     // personalization dictionary.
     public void clearPersonalizationDictionary() {
-        if (!hasPersonalizationDictionary()) {
+        final PersonalizationDictionary personalizationDict =
+                mDictionaries.mPersonalizationDictionary;
+        if (personalizationDict == null) {
             return;
         }
-        mPersonalizationDictionary.clearAndFlushDictionary();
+        personalizationDict.clearAndFlushDictionary();
     }
 
     public void addMultipleDictionaryEntriesToPersonalizationDictionary(
             final ArrayList<LanguageModelParam> languageModelParams,
             final ExpandableBinaryDictionary.AddMultipleDictionaryEntriesCallback callback) {
-        if (!hasPersonalizationDictionary()) {
+        final PersonalizationDictionary personalizationDict =
+                mDictionaries.mPersonalizationDictionary;
+        if (personalizationDict == null) {
             if (callback != null) {
                 callback.onFinished();
             }
             return;
         }
-        mPersonalizationDictionary.addMultipleDictionaryEntriesToDictionary(languageModelParams,
-                callback);
+        personalizationDict.addMultipleDictionaryEntriesToDictionary(languageModelParams, callback);
     }
 
     public void dumpDictionaryForDebug(final String dictName) {
         final ExpandableBinaryDictionary dictToDump;
         if (dictName.equals(Dictionary.TYPE_CONTACTS)) {
-            dictToDump = mContactsDictionary;
+            dictToDump = mDictionaries.mContactsDictionary;
         } else if (dictName.equals(Dictionary.TYPE_USER)) {
-            dictToDump = mUserDictionary;
+            dictToDump = mDictionaries.mUserDictionary;
         } else if (dictName.equals(Dictionary.TYPE_USER_HISTORY)) {
-            dictToDump = mUserHistoryDictionary;
+            dictToDump = mDictionaries.mUserHistoryDictionary;
         } else if (dictName.equals(Dictionary.TYPE_PERSONALIZATION)) {
-            dictToDump = mPersonalizationDictionary;
+            dictToDump = mDictionaries.mPersonalizationDictionary;
         } else {
             dictToDump = null;
         }
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 38e3864..0c0be82 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -215,7 +215,7 @@
                         false /* includeResumedWordInSuggestions */);
                 break;
             case MSG_REOPEN_DICTIONARIES:
-                latinIme.initSuggest();
+                latinIme.resetSuggest();
                 // In theory we could call latinIme.updateSuggestionStrip() right away, but
                 // in the practice, the dictionary is not finished opening yet so we wouldn't
                 // get any suggestions. Wait one frame.
@@ -478,10 +478,12 @@
 
         // TODO: Resolve mutual dependencies of {@link #loadSettings()} and {@link #initSuggest()}.
         loadSettings();
-        initSuggest();
+        resetSuggest();
 
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
             ResearchLogger.getInstance().init(this, mKeyboardSwitcher);
+            ResearchLogger.getInstance().initDictionary(
+                    mInputLogic.mSuggest.mDictionaryFacilitator);
         }
 
         // Register to receive ringer mode change and network state change.
@@ -520,31 +522,15 @@
         // This method is called on startup and language switch, before the new layout has
         // been displayed. Opening dictionaries never affects responsivity as dictionaries are
         // asynchronously loaded.
-        initOrResetSuggestForSettingsValues(mInputLogic.mSuggest, locale, currentSettingsValues);
-    }
-
-    private void initOrResetSuggestForSettingsValues(final Suggest oldSuggest,
-            final Locale locale, final SettingsValues settingsValues) {
-        if (!mHandler.hasPendingReopenDictionaries() && oldSuggest != null) {
-            // May need to reset dictionaries depending on the user settings.
-            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator =
-                    oldSuggest.mDictionaryFacilitator;
-            if (!oldDictionaryFacilitator.needsToBeRecreated(locale, settingsValues)) {
-                // Continue to use the same dictionary facilitator if no configuration has changed.
-                refreshPersonalizationDictionarySession();
-                return;
-            }
-            final DictionaryFacilitatorForSuggest dictionaryFacilitator =
-                    new DictionaryFacilitatorForSuggest(settingsValues, oldDictionaryFacilitator);
-            // Create Suggest instance with the new dictionary facilitator.
-            replaceSuggest(new Suggest(oldSuggest, dictionaryFacilitator));
-        } else if (oldSuggest == null) {
-            initSuggest();
+        if (!mHandler.hasPendingReopenDictionaries()) {
+            resetSuggestForLocale(locale);
         }
+        refreshPersonalizationDictionarySession();
     }
 
     private void refreshPersonalizationDictionarySession() {
-        final Suggest suggest = mInputLogic.mSuggest;
+        final DictionaryFacilitatorForSuggest dictionaryFacilitator =
+                mInputLogic.mSuggest.mDictionaryFacilitator;
         final boolean shouldKeepUserHistoryDictionaries;
         final boolean shouldKeepPersonalizationDictionaries;
         if (mSettings.getCurrent().mUsePersonalizedDicts) {
@@ -559,17 +545,13 @@
         if (!shouldKeepUserHistoryDictionaries) {
             // Remove user history dictionaries.
             PersonalizationHelper.removeAllUserHistoryDictionaries(this);
-            if (suggest != null) {
-                suggest.mDictionaryFacilitator.clearUserHistoryDictionary();
-            }
+            dictionaryFacilitator.clearUserHistoryDictionary();
         }
         if (!shouldKeepPersonalizationDictionaries) {
             // Remove personalization dictionaries.
             PersonalizationHelper.removeAllPersonalizationDictionaries(this);
             PersonalizationDictionarySessionRegistrar.resetAll(this);
         } else {
-            final DictionaryFacilitatorForSuggest dictionaryFacilitator =
-                    (suggest == null) ? null : suggest.mDictionaryFacilitator;
             PersonalizationDictionarySessionRegistrar.init(this, dictionaryFacilitator);
         }
     }
@@ -583,7 +565,7 @@
         }
     }
 
-    private void initSuggest() {
+    private void resetSuggest() {
         final Locale switcherSubtypeLocale = mSubtypeSwitcher.getCurrentSubtypeLocale();
         final String switcherLocaleStr = switcherSubtypeLocale.toString();
         final Locale subtypeLocale;
@@ -599,47 +581,42 @@
         } else {
             subtypeLocale = switcherSubtypeLocale;
         }
-        initSuggestForLocale(mInputLogic.mSuggest, subtypeLocale);
+        resetSuggestForLocale(subtypeLocale);
     }
 
-    private void initSuggestForLocale(final Suggest oldSuggest, final Locale locale) {
-        final SettingsValues settingsValues = mSettings.getCurrent();
-        final DictionaryFacilitatorForSuggest oldDictionaryFacilitator =
-                (oldSuggest == null) ? null : oldSuggest.mDictionaryFacilitator;
-        // Creates new dictionary facilitator for the new locale.
+    /**
+     * Reset suggest by loading dictionaries for the locale and the current settings values.
+     *
+     * @param locale the locale
+     */
+    private void resetSuggestForLocale(final Locale locale) {
         final DictionaryFacilitatorForSuggest dictionaryFacilitator =
-                new DictionaryFacilitatorForSuggest(this /* context */, locale, settingsValues,
-                        this /* DictionaryInitializationListener */, oldDictionaryFacilitator);
-        final Suggest newSuggest = new Suggest(locale, dictionaryFacilitator);
-        if (settingsValues.mCorrectionEnabled) {
-            newSuggest.setAutoCorrectionThreshold(settingsValues.mAutoCorrectionThreshold);
-        }
-        replaceSuggest(newSuggest);
-    }
-
-    /* package private */ void resetSuggestMainDict() {
-        final DictionaryFacilitatorForSuggest oldDictionaryFacilitator =
                 mInputLogic.mSuggest.mDictionaryFacilitator;
-        final DictionaryFacilitatorForSuggest dictionaryFacilitator =
-                new DictionaryFacilitatorForSuggest(this /* listener */, oldDictionaryFacilitator);
-        replaceSuggest(new Suggest(mInputLogic.mSuggest /* oldSuggest */, dictionaryFacilitator));
+        final SettingsValues settingsValues = mSettings.getCurrent();
+        dictionaryFacilitator.resetDictionaries(this /* context */, locale,
+                settingsValues.mUseContactsDict, settingsValues.mUsePersonalizedDicts,
+                false /* forceReloadMainDictionary */, this);
+        if (settingsValues.mCorrectionEnabled) {
+            mInputLogic.mSuggest.setAutoCorrectionThreshold(
+                    settingsValues.mAutoCorrectionThreshold);
+        }
     }
 
-    private void replaceSuggest(final Suggest newSuggest) {
-        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.getInstance().initDictionary(newSuggest.mDictionaryFacilitator);
-        }
-        mInputLogic.replaceSuggest(newSuggest);
-        refreshPersonalizationDictionarySession();
+    /**
+     * Reset suggest by loading the main dictionary of the current locale.
+     */
+    /* package private */ void resetSuggestMainDict() {
+        final DictionaryFacilitatorForSuggest dictionaryFacilitator =
+                mInputLogic.mSuggest.mDictionaryFacilitator;
+        final SettingsValues settingsValues = mSettings.getCurrent();
+        dictionaryFacilitator.resetDictionaries(this /* context */,
+                dictionaryFacilitator.getLocale(), settingsValues.mUseContactsDict,
+                settingsValues.mUsePersonalizedDicts, true /* forceReloadMainDictionary */, this);
     }
 
     @Override
     public void onDestroy() {
-        final Suggest suggest = mInputLogic.mSuggest;
-        if (suggest != null) {
-            suggest.close();
-            mInputLogic.mSuggest = null;
-        }
+        mInputLogic.mSuggest.mDictionaryFacilitator.closeDictionaries();
         mSettings.onDestroy();
         unregisterReceiver(mReceiver);
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
@@ -802,10 +779,10 @@
 
         // Note: the following does a round-trip IPC on the main thread: be careful
         final Locale currentLocale = mSubtypeSwitcher.getCurrentSubtypeLocale();
-        Suggest suggest = mInputLogic.mSuggest;
-        if (null != suggest && null != currentLocale && !currentLocale.equals(suggest.mLocale)) {
-            initSuggest();
-            suggest = mInputLogic.mSuggest;
+        final Suggest suggest = mInputLogic.mSuggest;
+        if (null != currentLocale && !currentLocale.equals(suggest.getLocale())) {
+            // TODO: Do this automatically.
+            resetSuggest();
         }
 
         // TODO[IL]: Can the following be moved to InputLogic#startInput?
@@ -833,13 +810,12 @@
         if (isDifferentTextField ||
                 !currentSettingsValues.hasSameOrientation(getResources().getConfiguration())) {
             loadSettings();
-            suggest = mInputLogic.mSuggest;
         }
         if (isDifferentTextField) {
             mainKeyboardView.closing();
             currentSettingsValues = mSettings.getCurrent();
 
-            if (suggest != null && currentSettingsValues.mCorrectionEnabled) {
+            if (currentSettingsValues.mCorrectionEnabled) {
                 suggest.setAutoCorrectionThreshold(currentSettingsValues.mAutoCorrectionThreshold);
             }
 
@@ -865,8 +841,8 @@
 
         mHandler.cancelUpdateSuggestionStrip();
 
-        mainKeyboardView.setMainDictionaryAvailability(null != suggest
-                ? suggest.mDictionaryFacilitator.hasMainDictionary() : false);
+        mainKeyboardView.setMainDictionaryAvailability(
+                suggest.mDictionaryFacilitator.hasInitializedMainDictionary());
         mainKeyboardView.setKeyPreviewPopupEnabled(currentSettingsValues.mKeyPreviewPopupOn,
                 currentSettingsValues.mKeyPreviewPopupDismissDelay);
         mainKeyboardView.setSlidingKeyInputPreviewEnabled(
@@ -1407,8 +1383,7 @@
     public void getSuggestedWords(final int sessionId, final int sequenceNumber,
             final OnGetSuggestedWordsCallback callback) {
         final Keyboard keyboard = mKeyboardSwitcher.getKeyboard();
-        final Suggest suggest = mInputLogic.mSuggest;
-        if (keyboard == null || suggest == null) {
+        if (keyboard == null) {
             callback.onGetSuggestedWords(SuggestedWords.EMPTY);
             return;
         }
@@ -1437,7 +1412,7 @@
                 }
             }
         }
-        suggest.getSuggestedWords(mInputLogic.mWordComposer,
+        mInputLogic.mSuggest.getSuggestedWords(mInputLogic.mWordComposer,
                 mInputLogic.mWordComposer.getPreviousWordForSuggestion(),
                 keyboard.getProximityInfo(), currentSettings.mBlockPotentiallyOffensive,
                 currentSettings.mCorrectionEnabled, additionalFeaturesOptions, sessionId,
@@ -1722,12 +1697,10 @@
     // DO NOT USE THIS for any other purpose than testing. This can break the keyboard badly.
     @UsedForTesting
     /* package for test */ void replaceDictionariesForTest(final Locale locale) {
-        final DictionaryFacilitatorForSuggest oldDictionaryFacilitator =
-                mInputLogic.mSuggest.mDictionaryFacilitator;
-        final DictionaryFacilitatorForSuggest dictionaryFacilitator =
-                new DictionaryFacilitatorForSuggest(this, locale, mSettings.getCurrent(),
-                        this /* listener */, oldDictionaryFacilitator);
-        replaceSuggest(new Suggest(locale, dictionaryFacilitator));
+        final SettingsValues settingsValues = mSettings.getCurrent();
+        mInputLogic.mSuggest.mDictionaryFacilitator.resetDictionaries(this, locale,
+            settingsValues.mUseContactsDict, settingsValues.mUsePersonalizedDicts,
+            false /* forceReloadMainDictionary */, this /* listener */);
     }
 
     // DO NOT USE THIS for any other purpose than testing.
@@ -1738,8 +1711,10 @@
     }
 
     public void dumpDictionaryForDebug(final String dictName) {
-        if (mInputLogic.mSuggest == null) {
-            initSuggest();
+        final DictionaryFacilitatorForSuggest dictionaryFacilitator =
+                mInputLogic.mSuggest.mDictionaryFacilitator;
+        if (dictionaryFacilitator.getLocale() == null) {
+            resetSuggest();
         }
         mInputLogic.mSuggest.mDictionaryFacilitator.dumpDictionaryForDebug(dictName);
     }
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index ba64028..9877dc8 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -23,12 +23,11 @@
 import com.android.inputmethod.latin.define.ProductionFlag;
 import com.android.inputmethod.latin.utils.AutoCorrectionUtils;
 import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
-import com.android.inputmethod.latin.utils.BoundedTreeSet;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.StringUtils;
+import com.android.inputmethod.latin.utils.SuggestionResults;
 
 import java.util.ArrayList;
-import java.util.Comparator;
 import java.util.Locale;
 
 /**
@@ -53,29 +52,16 @@
     private static final int SUPPRESS_SUGGEST_THRESHOLD = -2000000000;
 
     private static final boolean DBG = LatinImeLogger.sDBG;
-    public final DictionaryFacilitatorForSuggest mDictionaryFacilitator;
+    public final DictionaryFacilitatorForSuggest mDictionaryFacilitator =
+            new DictionaryFacilitatorForSuggest();
 
     private float mAutoCorrectionThreshold;
 
-    // Locale used for upper- and title-casing words
-    public final Locale mLocale;
-
-    // TODO: Move dictionaryFacilitator constructing logics from LatinIME to Suggest.
-    public Suggest(final Locale locale,
-            final DictionaryFacilitatorForSuggest dictionaryFacilitator) {
-        mLocale = locale;
-        mDictionaryFacilitator = dictionaryFacilitator;
+    public Locale getLocale() {
+        return mDictionaryFacilitator.getLocale();
     }
 
-    // Creates instance with new dictionary facilitator.
-    public Suggest(final Suggest oldSuggst,
-            final DictionaryFacilitatorForSuggest dictionaryFacilitator) {
-        mLocale = oldSuggst.mLocale;
-        mAutoCorrectionThreshold = oldSuggst.mAutoCorrectionThreshold;
-        mDictionaryFacilitator = dictionaryFacilitator;
-    }
-
-    public void setAutoCorrectionThreshold(float threshold) {
+    public void setAutoCorrectionThreshold(final float threshold) {
         mAutoCorrectionThreshold = threshold;
     }
 
@@ -108,9 +94,6 @@
             final int[] additionalFeaturesOptions, final int sequenceNumber,
             final OnGetSuggestedWordsCallback callback) {
         final int trailingSingleQuotesCount = wordComposer.trailingSingleQuotesCount();
-        final BoundedTreeSet suggestionsSet = new BoundedTreeSet(sSuggestedWordInfoComparator,
-                SuggestedWords.MAX_SUGGESTIONS);
-
         final String typedWord = wordComposer.getTypedWord();
         final String consideredWord = trailingSingleQuotesCount > 0
                 ? typedWord.substring(0, typedWord.length() - trailingSingleQuotesCount)
@@ -132,20 +115,20 @@
         } else {
             rawSuggestions = null;
         }
-        mDictionaryFacilitator.getSuggestions(wordComposerForLookup, prevWordForBigram,
-                proximityInfo, blockOffensiveWords, additionalFeaturesOptions, SESSION_TYPING,
-                suggestionsSet, rawSuggestions);
+        final SuggestionResults suggestionResults = mDictionaryFacilitator.getSuggestionResults(
+                wordComposerForLookup, prevWordForBigram, proximityInfo, blockOffensiveWords,
+                additionalFeaturesOptions, SESSION_TYPING, rawSuggestions);
 
         final boolean isFirstCharCapitalized = wordComposer.isFirstCharCapitalized();
         final boolean isAllUpperCase = wordComposer.isAllUpperCase();
         final String firstSuggestion;
         final String whitelistedWord;
-        if (suggestionsSet.isEmpty()) {
+        if (suggestionResults.isEmpty()) {
             whitelistedWord = firstSuggestion = null;
         } else {
             final SuggestedWordInfo firstSuggestedWordInfo = getTransformedSuggestedWordInfo(
-                    suggestionsSet.first(), mLocale, isAllUpperCase, isFirstCharCapitalized,
-                    trailingSingleQuotesCount);
+                    suggestionResults.first(), suggestionResults.mLocale, isAllUpperCase,
+                    isFirstCharCapitalized, trailingSingleQuotesCount);
             firstSuggestion = firstSuggestedWordInfo.mWord;
             if (SuggestedWordInfo.KIND_WHITELIST != firstSuggestedWordInfo.mKind) {
                 whitelistedWord = null;
@@ -175,10 +158,10 @@
         // the current settings. It may also be useful to know, when the setting is off, whether
         // the word *would* have been auto-corrected.
         if (!isCorrectionEnabled || !allowsToBeAutoCorrected || isPrediction
-                || suggestionsSet.isEmpty() || wordComposer.hasDigits()
+                || suggestionResults.isEmpty() || wordComposer.hasDigits()
                 || wordComposer.isMostlyCaps() || wordComposer.isResumed()
-                || !mDictionaryFacilitator.hasMainDictionary()
-                || SuggestedWordInfo.KIND_SHORTCUT == suggestionsSet.first().mKind) {
+                || !mDictionaryFacilitator.hasInitializedMainDictionary()
+                || SuggestedWordInfo.KIND_SHORTCUT == suggestionResults.first().mKind) {
             // If we don't have a main dictionary, we never want to auto-correct. The reason for
             // this is, the user may have a contact whose name happens to match a valid word in
             // their language, and it will unexpectedly auto-correct. For example, if the user
@@ -190,17 +173,17 @@
             hasAutoCorrection = false;
         } else {
             hasAutoCorrection = AutoCorrectionUtils.suggestionExceedsAutoCorrectionThreshold(
-                    suggestionsSet.first(), consideredWord, mAutoCorrectionThreshold);
+                    suggestionResults.first(), consideredWord, mAutoCorrectionThreshold);
         }
 
         final ArrayList<SuggestedWordInfo> suggestionsContainer =
-                CollectionUtils.newArrayList(suggestionsSet);
+                CollectionUtils.newArrayList(suggestionResults);
         final int suggestionsCount = suggestionsContainer.size();
         if (isFirstCharCapitalized || isAllUpperCase || 0 != trailingSingleQuotesCount) {
             for (int i = 0; i < suggestionsCount; ++i) {
                 final SuggestedWordInfo wordInfo = suggestionsContainer.get(i);
                 final SuggestedWordInfo transformedWordInfo = getTransformedSuggestedWordInfo(
-                        wordInfo, mLocale, isAllUpperCase, isFirstCharCapitalized,
+                        wordInfo, suggestionResults.mLocale, isAllUpperCase, isFirstCharCapitalized,
                         trailingSingleQuotesCount);
                 suggestionsContainer.set(i, transformedWordInfo);
             }
@@ -244,23 +227,21 @@
             final boolean blockOffensiveWords, final int[] additionalFeaturesOptions,
             final int sessionId, final int sequenceNumber,
             final OnGetSuggestedWordsCallback callback) {
-        final BoundedTreeSet suggestionsSet = new BoundedTreeSet(sSuggestedWordInfoComparator,
-                SuggestedWords.MAX_SUGGESTIONS);
         final ArrayList<SuggestedWordInfo> rawSuggestions;
         if (ProductionFlag.INCLUDE_RAW_SUGGESTIONS) {
             rawSuggestions = CollectionUtils.newArrayList();
         } else {
             rawSuggestions = null;
         }
-        mDictionaryFacilitator.getSuggestions(wordComposer, prevWordForBigram, proximityInfo,
-                blockOffensiveWords, additionalFeaturesOptions, sessionId, suggestionsSet,
-                rawSuggestions);
-        for (SuggestedWordInfo wordInfo : suggestionsSet) {
+        final SuggestionResults suggestionResults = mDictionaryFacilitator.getSuggestionResults(
+                wordComposer, prevWordForBigram, proximityInfo, blockOffensiveWords,
+                additionalFeaturesOptions, sessionId, rawSuggestions);
+        for (SuggestedWordInfo wordInfo : suggestionResults) {
             LatinImeLogger.onAddSuggestedWord(wordInfo.mWord, wordInfo.mSourceDict.mDictType);
         }
 
         final ArrayList<SuggestedWordInfo> suggestionsContainer =
-                CollectionUtils.newArrayList(suggestionsSet);
+                CollectionUtils.newArrayList(suggestionResults);
         final int suggestionsCount = suggestionsContainer.size();
         final boolean isFirstCharCapitalized = wordComposer.wasShiftedNoLock();
         final boolean isAllUpperCase = wordComposer.isAllUpperCase();
@@ -268,7 +249,7 @@
             for (int i = 0; i < suggestionsCount; ++i) {
                 final SuggestedWordInfo wordInfo = suggestionsContainer.get(i);
                 final SuggestedWordInfo transformedWordInfo = getTransformedSuggestedWordInfo(
-                        wordInfo, mLocale, isAllUpperCase, isFirstCharCapitalized,
+                        wordInfo, suggestionResults.mLocale, isAllUpperCase, isFirstCharCapitalized,
                         0 /* trailingSingleQuotesCount */);
                 suggestionsContainer.set(i, transformedWordInfo);
             }
@@ -326,22 +307,6 @@
         return suggestionsList;
     }
 
-    private static final class SuggestedWordInfoComparator
-            implements Comparator<SuggestedWordInfo> {
-        // This comparator ranks the word info with the higher frequency first. That's because
-        // that's the order we want our elements in.
-        @Override
-        public int compare(final SuggestedWordInfo o1, final SuggestedWordInfo o2) {
-            if (o1.mScore > o2.mScore) return -1;
-            if (o1.mScore < o2.mScore) return 1;
-            if (o1.mCodePointCount < o2.mCodePointCount) return -1;
-            if (o1.mCodePointCount > o2.mCodePointCount) return 1;
-            return o1.mWord.compareTo(o2.mWord);
-        }
-    }
-    private static final SuggestedWordInfoComparator sSuggestedWordInfoComparator =
-            new SuggestedWordInfoComparator();
-
     /* package for test */ static SuggestedWordInfo getTransformedSuggestedWordInfo(
             final SuggestedWordInfo wordInfo, final Locale locale, final boolean isAllUpperCase,
             final boolean isFirstCharCapitalized, final int trailingSingleQuotesCount) {
@@ -365,8 +330,4 @@
                 wordInfo.mSourceDict, wordInfo.mIndexOfTouchPointOfSecondWord,
                 wordInfo.mAutoCommitFirstWordConfidence);
     }
-
-    public void close() {
-        mDictionaryFacilitator.close();
-    }
 }
diff --git a/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java b/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
index 36b30ea..ffa5e8e 100644
--- a/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
+++ b/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
@@ -32,6 +32,7 @@
 import com.android.inputmethod.keyboard.KeyboardSwitcher;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.Dictionary;
+import com.android.inputmethod.latin.DictionaryFacilitatorForSuggest;
 import com.android.inputmethod.latin.InputPointers;
 import com.android.inputmethod.latin.LastComposedWord;
 import com.android.inputmethod.latin.LatinIME;
@@ -77,8 +78,7 @@
     private int mSpaceState;
     // Never null
     public SuggestedWords mSuggestedWords = SuggestedWords.EMPTY;
-    // TODO: mSuggest should be touched by a single thread.
-    public volatile Suggest mSuggest;
+    public final Suggest mSuggest = new Suggest();
 
     public LastComposedWord mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD;
     public final WordComposer mWordComposer;
@@ -106,15 +106,6 @@
         mInputLogicHandler = InputLogicHandler.NULL_HANDLER;
     }
 
-    // Replace the old Suggest with the passed Suggest and close it.
-    public void replaceSuggest(final Suggest newSuggest) {
-        final Suggest oldSuggest = mSuggest;
-        mSuggest = newSuggest;
-        if (oldSuggest != null) {
-            oldSuggest.close();
-        }
-    }
-
     /**
      * Initializes the input logic for input in an editor.
      *
@@ -283,23 +274,18 @@
 
         // We should show the "Touch again to save" hint if the user pressed the first entry
         // AND it's in none of our current dictionaries (main, user or otherwise).
-        // Please note that if mSuggest is null, it means that everything is off: suggestion
-        // and correction, so we shouldn't try to show the hint
-        final Suggest suggest = mSuggest;
+        final DictionaryFacilitatorForSuggest dictionaryFacilitator =
+                mSuggest.mDictionaryFacilitator;
         final boolean showingAddToDictionaryHint =
                 (SuggestedWordInfo.KIND_TYPED == suggestionInfo.mKind
                         || SuggestedWordInfo.KIND_OOV_CORRECTION == suggestionInfo.mKind)
-                        && suggest != null
-                        // If the suggestion is not in the dictionary, the hint should be shown.
-                        && !suggest.mDictionaryFacilitator.isValidWord(suggestion,
-                                true /* ignoreCase */);
+                        && !dictionaryFacilitator.isValidWord(suggestion, true /* ignoreCase */);
 
         if (settingsValues.mIsInternal) {
             LatinImeLoggerUtils.onSeparator((char)Constants.CODE_SPACE,
                     Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
         }
-        if (showingAddToDictionaryHint
-                && suggest.mDictionaryFacilitator.isUserDictionaryEnabled()) {
+        if (showingAddToDictionaryHint && dictionaryFacilitator.isUserDictionaryEnabled()) {
             mSuggestionStripViewAccessor.showAddToDictionaryHint(suggestion);
         } else {
             // If we're not showing the "Touch again to save", then update the suggestion strip.
@@ -1231,20 +1217,17 @@
         if (!settingsValues.mCorrectionEnabled) return;
 
         if (TextUtils.isEmpty(suggestion)) return;
-        final Suggest suggest = mSuggest;
-        if (suggest == null) return;
-
         final boolean wasAutoCapitalized =
                 mWordComposer.wasAutoCapitalized() && !mWordComposer.isMostlyCaps();
         final int timeStampInSeconds = (int)TimeUnit.MILLISECONDS.toSeconds(
                 System.currentTimeMillis());
-        suggest.mDictionaryFacilitator.addToUserHistory(suggestion, wasAutoCapitalized, prevWord,
+        mSuggest.mDictionaryFacilitator.addToUserHistory(suggestion, wasAutoCapitalized, prevWord,
                 timeStampInSeconds);
     }
 
     public void performUpdateSuggestionStripSync(final SettingsValues settingsValues) {
         // Check if we have a suggestion engine attached.
-        if (mSuggest == null || !settingsValues.isSuggestionsRequested()) {
+        if (!settingsValues.isSuggestionsRequested()) {
             if (mWordComposer.isComposingWord()) {
                 Log.w(TAG, "Called updateSuggestionsOrPredictions but suggestions were not "
                         + "requested!");
@@ -1446,10 +1429,8 @@
         }
         mConnection.deleteSurroundingText(deleteLength, 0);
         if (!TextUtils.isEmpty(previousWord) && !TextUtils.isEmpty(committedWord)) {
-            if (mSuggest != null) {
-                mSuggest.mDictionaryFacilitator.cancelAddingUserHistory(
-                        previousWord, committedWordString);
-            }
+            mSuggest.mDictionaryFacilitator.cancelAddingUserHistory(
+                    previousWord, committedWordString);
         }
         final String stringToCommit = originallyTypedWord + mLastComposedWord.mSeparatorString;
         final SpannableString textToCommit = new SpannableString(stringToCommit);
diff --git a/java/src/com/android/inputmethod/latin/utils/BoundedTreeSet.java b/java/src/com/android/inputmethod/latin/utils/BoundedTreeSet.java
deleted file mode 100644
index ae1fd3f..0000000
--- a/java/src/com/android/inputmethod/latin/utils/BoundedTreeSet.java
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.utils;
-
-import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
-
-import java.util.Collection;
-import java.util.Comparator;
-import java.util.TreeSet;
-
-/**
- * A TreeSet that is bounded in size and throws everything that's smaller than its limit
- */
-public final class BoundedTreeSet extends TreeSet<SuggestedWordInfo> {
-    private final int mCapacity;
-    public BoundedTreeSet(final Comparator<SuggestedWordInfo> comparator, final int capacity) {
-        super(comparator);
-        mCapacity = capacity;
-    }
-
-    @Override
-    public boolean add(final SuggestedWordInfo e) {
-        if (size() < mCapacity) return super.add(e);
-        if (comparator().compare(e, last()) > 0) return false;
-        super.add(e);
-        pollLast(); // removes the last element
-        return true;
-    }
-
-    @Override
-    public boolean addAll(final Collection<? extends SuggestedWordInfo> e) {
-        if (null == e) return false;
-        return super.addAll(e);
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/utils/LanguageModelParam.java b/java/src/com/android/inputmethod/latin/utils/LanguageModelParam.java
index 562ff9e..acd16a9 100644
--- a/java/src/com/android/inputmethod/latin/utils/LanguageModelParam.java
+++ b/java/src/com/android/inputmethod/latin/utils/LanguageModelParam.java
@@ -119,7 +119,7 @@
     private static LanguageModelParam detectWhetherVaildWordOrNotAndGetLanguageModelParam(
             final String prevWord, final String targetWord, final int timestamp,
             final DictionaryFacilitatorForSuggest dictionaryFacilitator) {
-        final Locale locale = dictionaryFacilitator.mLocale;
+        final Locale locale = dictionaryFacilitator.getLocale();
         if (!dictionaryFacilitator.isValidWord(targetWord, true /* ignoreCase */)) {
             // OOV word.
             return createAndGetLanguageModelParamOfWord(prevWord, targetWord, timestamp,
diff --git a/java/src/com/android/inputmethod/latin/utils/SuggestionResults.java b/java/src/com/android/inputmethod/latin/utils/SuggestionResults.java
new file mode 100644
index 0000000..0b362c4
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/utils/SuggestionResults.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.utils;
+
+import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.Locale;
+import java.util.TreeSet;
+
+/**
+ * A TreeSet of SuggestedWordInfo that is bounded in size and throws everything that's smaller
+ * than its limit
+ */
+public final class SuggestionResults extends TreeSet<SuggestedWordInfo> {
+    public final Locale mLocale;
+    private final int mCapacity;
+
+    public SuggestionResults(final Locale locale, final int capacity) {
+        this(locale, sSuggestedWordInfoComparator, capacity);
+    }
+
+    public SuggestionResults(final Locale locale, final Comparator<SuggestedWordInfo> comparator,
+            final int capacity) {
+        super(comparator);
+        mLocale = locale;
+        mCapacity = capacity;
+    }
+
+    @Override
+    public boolean add(final SuggestedWordInfo e) {
+        if (size() < mCapacity) return super.add(e);
+        if (comparator().compare(e, last()) > 0) return false;
+        super.add(e);
+        pollLast(); // removes the last element
+        return true;
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends SuggestedWordInfo> e) {
+        if (null == e) return false;
+        return super.addAll(e);
+    }
+
+    private static final class SuggestedWordInfoComparator
+            implements Comparator<SuggestedWordInfo> {
+        // This comparator ranks the word info with the higher frequency first. That's because
+        // that's the order we want our elements in.
+        @Override
+        public int compare(final SuggestedWordInfo o1, final SuggestedWordInfo o2) {
+            if (o1.mScore > o2.mScore) return -1;
+            if (o1.mScore < o2.mScore) return 1;
+            if (o1.mCodePointCount < o2.mCodePointCount) return -1;
+            if (o1.mCodePointCount > o2.mCodePointCount) return 1;
+            return o1.mWord.compareTo(o2.mWord);
+        }
+    }
+
+    private static final SuggestedWordInfoComparator sSuggestedWordInfoComparator =
+            new SuggestedWordInfoComparator();
+}
diff --git a/java/src/com/android/inputmethod/research/MainLogBuffer.java b/java/src/com/android/inputmethod/research/MainLogBuffer.java
index 9b1d8c5..ffdb43c 100644
--- a/java/src/com/android/inputmethod/research/MainLogBuffer.java
+++ b/java/src/com/android/inputmethod/research/MainLogBuffer.java
@@ -155,8 +155,9 @@
         }
         // Reload the dictionary in case it has changed (e.g., because the user has changed
         // languages).
-        if ((mDictionaryFacilitator == null || !mDictionaryFacilitator.hasMainDictionary())
-                && mDictionaryForTesting == null) {
+        if ((mDictionaryFacilitator == null
+                || !mDictionaryFacilitator.hasInitializedMainDictionary())
+                        && mDictionaryForTesting == null) {
             // Main dictionary is unavailable.  Since we cannot check it, we cannot tell if a
             // word is out-of-vocabulary or not.  Therefore, we must judge the entire buffer
             // contents to potentially pose a privacy risk.