Merge "[MS40.2] Remove Clock dependencies from NetworkStatsService"
diff --git a/staticlibs/framework/com/android/net/module/util/BestClock.java b/staticlibs/framework/com/android/net/module/util/BestClock.java
new file mode 100644
index 0000000..35391ad
--- /dev/null
+++ b/staticlibs/framework/com/android/net/module/util/BestClock.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2021 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.net.module.util;
+
+import android.util.Log;
+
+import java.time.Clock;
+import java.time.DateTimeException;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.util.Arrays;
+
+/**
+ * Single {@link Clock} that will return the best available time from a set of
+ * prioritized {@link Clock} instances.
+ * <p>
+ * For example, when {@link SystemClock#currentNetworkTimeClock()} isn't able to
+ * provide the time, this class could use {@link Clock#systemUTC()} instead.
+ *
+ * Note that this is re-implemented based on {@code android.os.BestClock} to be used inside
+ * the mainline module. And the class does NOT support serialization.
+ *
+ * @hide
+ */
+final public class BestClock extends Clock {
+ private static final String TAG = "BestClock";
+ private final ZoneId mZone;
+ private final Clock[] mClocks;
+
+ public BestClock(ZoneId zone, Clock... clocks) {
+ super();
+ this.mZone = zone;
+ this.mClocks = clocks;
+ }
+
+ @Override
+ public long millis() {
+ for (Clock clock : mClocks) {
+ try {
+ return clock.millis();
+ } catch (DateTimeException e) {
+ // Ignore and attempt the next clock
+ Log.w(TAG, e.toString());
+ }
+ }
+ throw new DateTimeException(
+ "No clocks in " + Arrays.toString(mClocks) + " were able to provide time");
+ }
+
+ @Override
+ public ZoneId getZone() {
+ return mZone;
+ }
+
+ @Override
+ public Clock withZone(ZoneId zone) {
+ return new BestClock(zone, mClocks);
+ }
+
+ @Override
+ public Instant instant() {
+ return Instant.ofEpochMilli(millis());
+ }
+}