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/*
* 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());
}
}
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