diff --git a/update_attempter.cc b/update_attempter.cc
index ad3bd9e..ebfcd1d 100644
--- a/update_attempter.cc
+++ b/update_attempter.cc
@@ -3,10 +3,18 @@
 // found in the LICENSE file.
 
 #include "update_engine/update_attempter.h"
+
+// From 'man clock_gettime': feature test macro: _POSIX_C_SOURCE >= 199309L
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 199309L
+#endif  // _POSIX_C_SOURCE
+#include <time.h>
+
 #include <tr1/memory>
 #include <string>
 #include <vector>
 #include <glib.h>
+#include "update_engine/dbus_service.h"
 #include "update_engine/download_action.h"
 #include "update_engine/filesystem_copier_action.h"
 #include "update_engine/libcurl_http_fetcher.h"
@@ -22,6 +30,59 @@
 
 namespace chromeos_update_engine {
 
+namespace {
+// Returns true on success.
+bool GetCPUClockTime(struct timespec* out) {
+  return clock_gettime(CLOCK_REALTIME, out) == 0;
+}
+// Returns stop - start.
+struct timespec CPUClockTimeElapsed(const struct timespec& start,
+                                    const struct timespec& stop) {
+  CHECK(start.tv_sec >= 0);
+  CHECK(stop.tv_sec >= 0);
+  CHECK(start.tv_nsec >= 0);
+  CHECK(stop.tv_nsec >= 0);
+
+  const int64_t kOneBillion = 1000000000L;
+  const int64_t start64 = start.tv_sec * kOneBillion + start.tv_nsec;
+  const int64_t stop64 = stop.tv_sec * kOneBillion + stop.tv_nsec;
+
+  const int64_t result64 = stop64 - start64;
+
+  struct timespec ret;
+  ret.tv_sec = result64 / kOneBillion;
+  ret.tv_nsec = result64 % kOneBillion;
+
+  return ret;
+}
+bool CPUClockTimeGreaterThanHalfSecond(const struct timespec& spec) {
+  if (spec.tv_sec >= 1)
+    return true;
+  return (spec.tv_nsec > 500000000);
+}
+}
+
+const char* UpdateStatusToString(UpdateStatus status) {
+  switch (status) {
+    case UPDATE_STATUS_IDLE:
+      return "UPDATE_STATUS_IDLE";
+    case UPDATE_STATUS_CHECKING_FOR_UPDATE:
+      return "UPDATE_STATUS_CHECKING_FOR_UPDATE";
+    case UPDATE_STATUS_UPDATE_AVAILABLE:
+      return "UPDATE_STATUS_UPDATE_AVAILABLE";
+    case UPDATE_STATUS_DOWNLOADING:
+      return "UPDATE_STATUS_DOWNLOADING";
+    case UPDATE_STATUS_VERIFYING:
+      return "UPDATE_STATUS_VERIFYING";
+    case UPDATE_STATUS_FINALIZING:
+      return "UPDATE_STATUS_FINALIZING";
+    case UPDATE_STATUS_UPDATED_NEED_REBOOT:
+      return "UPDATE_STATUS_UPDATED_NEED_REBOOT";
+    default:
+      return "unknown status";
+  }
+}
+
 void UpdateAttempter::Update(bool force_full_update) {
   full_update_ = force_full_update;
   CHECK(!processor_.IsRunning());
@@ -46,7 +107,8 @@
       new SetBootableFlagAction);
   shared_ptr<PostinstallRunnerAction> postinstall_runner_action_postcommit(
       new PostinstallRunnerAction(false));
-      
+  
+  download_action->set_delegate(this);
   response_handler_action_ = response_handler_action;
 
   actions_.push_back(shared_ptr<AbstractAction>(request_prep_action));
@@ -87,22 +149,63 @@
   BondActions(set_bootable_flag_action.get(),
               postinstall_runner_action_postcommit.get());
 
+  SetStatusAndNotify(UPDATE_STATUS_CHECKING_FOR_UPDATE);
   processor_.StartProcessing();
 }
 
-// Delegate method:
+void UpdateAttempter::CheckForUpdate() {
+  if (status_ != UPDATE_STATUS_IDLE) {
+    LOG(INFO) << "Check for update requested, but status is "
+              << UpdateStatusToString(status_) << ", so not checking.";
+    return;
+  }
+  Update(false);
+}
+
+// Delegate methods:
 void UpdateAttempter::ProcessingDone(const ActionProcessor* processor,
                                      bool success) {
   CHECK(response_handler_action_);
-  if (response_handler_action_->GotNoUpdateResponse()) {
-    // All done.
-    g_main_loop_quit(loop_);
-    return;
-  }
-  if (!success) {
+  LOG(INFO) << "Processing Done.";
+  if (success) {
+    SetStatusAndNotify(UPDATE_STATUS_UPDATED_NEED_REBOOT);
+  } else {
     LOG(INFO) << "Update failed.";
+    SetStatusAndNotify(UPDATE_STATUS_IDLE);
   }
-  g_main_loop_quit(loop_);
+}
+
+void UpdateAttempter::ProcessingStopped(const ActionProcessor* processor) {
+  download_progress_ = 0.0;
+  SetStatusAndNotify(UPDATE_STATUS_IDLE);
+}
+
+// Called whenever an action has finished processing, either successfully
+// or otherwise.
+void UpdateAttempter::ActionCompleted(ActionProcessor* processor,
+                                      AbstractAction* action,
+                                      bool success) {
+  // Reset download progress regardless of whether or not the download action
+  // succeeded.
+  const string type = action->Type();
+  if (type == DownloadAction::StaticType())
+    download_progress_ = 0.0;
+  if (!success)
+    return;
+  // Find out which action completed.
+  if (type == OmahaResponseHandlerAction::StaticType()) {
+    SetStatusAndNotify(UPDATE_STATUS_DOWNLOADING);
+    OmahaResponseHandlerAction* omaha_response_handler_action = 
+        dynamic_cast<OmahaResponseHandlerAction*>(action);
+    CHECK(omaha_response_handler_action);
+    const InstallPlan& plan = omaha_response_handler_action->install_plan();
+    last_checked_time_ = time(NULL);
+    // TODO(adlr): put version in InstallPlan
+    new_version_ = "0.0.0.0";
+    new_size_ = plan.size;
+  } else if (type == DownloadAction::StaticType()) {
+    SetStatusAndNotify(UPDATE_STATUS_FINALIZING);
+  }
 }
 
 // Stop updating. An attempt will be made to record status to the disk
@@ -118,19 +221,49 @@
   NOTIMPLEMENTED();
 }
 
+void UpdateAttempter::BytesReceived(uint64_t bytes_received, uint64_t total) {
+  if (status_ != UPDATE_STATUS_DOWNLOADING) {
+    LOG(ERROR) << "BytesReceived called while not downloading.";
+    return;
+  }
+  download_progress_ = static_cast<double>(bytes_received) /
+      static_cast<double>(total);
+  // We self throttle here
+  timespec now;
+  now.tv_sec = 0;
+  now.tv_nsec = 0;
+  if (GetCPUClockTime(&now) &&
+      CPUClockTimeGreaterThanHalfSecond(
+          CPUClockTimeElapsed(last_notify_time_, now))) {
+    SetStatusAndNotify(UPDATE_STATUS_DOWNLOADING);
+  }
+}
+
 bool UpdateAttempter::GetStatus(int64_t* last_checked_time,
                                 double* progress,
                                 std::string* current_operation,
                                 std::string* new_version,
                                 int64_t* new_size) {
-  // TODO(adlr): Return actual status.
-  *last_checked_time = 123;
-  *progress = 0.2223;
-  *current_operation = "DOWNLOADING";
-  *new_version = "0.2.3.8";
-  *new_size = 10002;
+  *last_checked_time = last_checked_time_;
+  *progress = download_progress_;
+  *current_operation = UpdateStatusToString(status_);
+  *new_version = new_version_;
+  *new_size = new_size_;
   return true;
 }
 
+void UpdateAttempter::SetStatusAndNotify(UpdateStatus status) {
+  status_ = status;
+  if (!dbus_service_)
+    return;
+  GetCPUClockTime(&last_notify_time_);
+  update_engine_service_emit_status_update(
+      dbus_service_,
+      last_checked_time_,
+      download_progress_,
+      UpdateStatusToString(status_),
+      new_version_.c_str(),
+      new_size_);
+}
 
 }  // namespace chromeos_update_engine