| /* |
| * Copyright (C) 2018 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.internal.os; |
| |
| |
| import android.os.SystemClock; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * Stores the device state (e.g. charging/on battery, screen on/off) to be shared with |
| * the System Server telemetry services. |
| * |
| * @hide |
| */ |
| public class CachedDeviceState { |
| private volatile boolean mScreenInteractive; |
| private volatile boolean mCharging; |
| private final Object mStopwatchesLock = new Object(); |
| @GuardedBy("mStopwatchLock") |
| private final ArrayList<TimeInStateStopwatch> mOnBatteryStopwatches = new ArrayList<>(); |
| |
| public CachedDeviceState() { |
| mCharging = true; |
| mScreenInteractive = false; |
| } |
| |
| @VisibleForTesting |
| public CachedDeviceState(boolean isCharging, boolean isScreenInteractive) { |
| mCharging = isCharging; |
| mScreenInteractive = isScreenInteractive; |
| } |
| |
| public void setScreenInteractive(boolean screenInteractive) { |
| mScreenInteractive = screenInteractive; |
| } |
| |
| public void setCharging(boolean charging) { |
| if (mCharging != charging) { |
| mCharging = charging; |
| updateStopwatches(/* shouldStart= */ !charging); |
| } |
| } |
| |
| private void updateStopwatches(boolean shouldStart) { |
| synchronized (mStopwatchesLock) { |
| final int size = mOnBatteryStopwatches.size(); |
| for (int i = 0; i < size; i++) { |
| if (shouldStart) { |
| mOnBatteryStopwatches.get(i).start(); |
| } else { |
| mOnBatteryStopwatches.get(i).stop(); |
| } |
| } |
| } |
| } |
| |
| public Readonly getReadonlyClient() { |
| return new CachedDeviceState.Readonly(); |
| } |
| |
| /** |
| * Allows for only a readonly access to the device state. |
| */ |
| public class Readonly { |
| public boolean isCharging() { |
| return mCharging; |
| } |
| |
| public boolean isScreenInteractive() { |
| return mScreenInteractive; |
| } |
| |
| /** Creates a {@link TimeInStateStopwatch stopwatch} that tracks the time on battery. */ |
| public TimeInStateStopwatch createTimeOnBatteryStopwatch() { |
| synchronized (mStopwatchesLock) { |
| final TimeInStateStopwatch stopwatch = new TimeInStateStopwatch(); |
| mOnBatteryStopwatches.add(stopwatch); |
| if (!mCharging) { |
| stopwatch.start(); |
| } |
| return stopwatch; |
| } |
| } |
| } |
| |
| /** Tracks the time the device spent in a given state. */ |
| public class TimeInStateStopwatch implements AutoCloseable { |
| private final Object mLock = new Object(); |
| @GuardedBy("mLock") |
| private long mStartTimeMillis; |
| @GuardedBy("mLock") |
| private long mTotalTimeMillis; |
| |
| /** Returns the time in state since the last call to {@link TimeInStateStopwatch#reset}. */ |
| public long getMillis() { |
| synchronized (mLock) { |
| return mTotalTimeMillis + elapsedTime(); |
| } |
| } |
| |
| /** Resets the time in state to 0 without stopping the timer if it's started. */ |
| public void reset() { |
| synchronized (mLock) { |
| mTotalTimeMillis = 0; |
| mStartTimeMillis = isRunning() ? SystemClock.elapsedRealtime() : 0; |
| } |
| } |
| |
| private void start() { |
| synchronized (mLock) { |
| if (!isRunning()) { |
| mStartTimeMillis = SystemClock.elapsedRealtime(); |
| } |
| } |
| } |
| |
| private void stop() { |
| synchronized (mLock) { |
| if (isRunning()) { |
| mTotalTimeMillis += elapsedTime(); |
| mStartTimeMillis = 0; |
| } |
| } |
| } |
| |
| private long elapsedTime() { |
| return isRunning() ? SystemClock.elapsedRealtime() - mStartTimeMillis : 0; |
| } |
| |
| @VisibleForTesting |
| public boolean isRunning() { |
| return mStartTimeMillis > 0; |
| } |
| |
| @Override |
| public void close() { |
| synchronized (mStopwatchesLock) { |
| mOnBatteryStopwatches.remove(this); |
| } |
| } |
| } |
| } |