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/*
* 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.server.task.controllers;
import java.util.ArrayList;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.SystemClock;
import android.util.Slog;
import com.android.server.task.StateChangedListener;
import com.android.server.task.TaskManagerService;
public class IdleController extends StateController {
private static final String TAG = "IdleController";
// Policy: we decide that we're "idle" if the device has been unused /
// screen off or dreaming for at least this long
private static final long INACTIVITY_IDLE_THRESHOLD = 71 * 60 * 1000; // millis; 71 min
private static final long IDLE_WINDOW_SLOP = 5 * 60 * 1000; // 5 minute window, to be nice
private static final String ACTION_TRIGGER_IDLE =
"com.android.server.task.controllers.IdleController.ACTION_TRIGGER_IDLE";
final ArrayList<TaskStatus> mTrackedTasks = new ArrayList<TaskStatus>();
IdlenessTracker mIdleTracker;
// Singleton factory
private static Object sCreationLock = new Object();
private static volatile IdleController sController;
public static IdleController get(TaskManagerService service) {
synchronized (sCreationLock) {
if (sController == null) {
sController = new IdleController(service, service.getContext());
}
return sController;
}
}
private IdleController(StateChangedListener stateChangedListener, Context context) {
super(stateChangedListener, context);
initIdleStateTracking();
}
/**
* StateController interface
*/
@Override
public void maybeStartTrackingTask(TaskStatus taskStatus) {
if (taskStatus.hasIdleConstraint()) {
synchronized (mTrackedTasks) {
mTrackedTasks.add(taskStatus);
taskStatus.idleConstraintSatisfied.set(mIdleTracker.isIdle());
}
}
}
@Override
public void maybeStopTrackingTask(TaskStatus taskStatus) {
synchronized (mTrackedTasks) {
mTrackedTasks.remove(taskStatus);
}
}
/**
* Interaction with the task manager service
*/
void reportNewIdleState(boolean isIdle) {
synchronized (mTrackedTasks) {
for (TaskStatus task : mTrackedTasks) {
task.idleConstraintSatisfied.set(isIdle);
}
}
mStateChangedListener.onControllerStateChanged();
}
/**
* Idle state tracking, and messaging with the task manager when
* significant state changes occur
*/
private void initIdleStateTracking() {
mIdleTracker = new IdlenessTracker();
mIdleTracker.startTracking();
}
class IdlenessTracker extends BroadcastReceiver {
private AlarmManager mAlarm;
private PendingIntent mIdleTriggerIntent;
boolean mIdle;
public IdlenessTracker() {
mAlarm = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(ACTION_TRIGGER_IDLE);
intent.setComponent(new ComponentName(mContext, this.getClass()));
mIdleTriggerIntent = PendingIntent.getBroadcast(mContext, 0, intent, 0);
// at boot we presume that the user has just "interacted" with the
// device in some meaningful way
mIdle = false;
}
public boolean isIdle() {
return mIdle;
}
public void startTracking() {
IntentFilter filter = new IntentFilter();
// Screen state
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
// Dreaming state
filter.addAction(Intent.ACTION_DREAMING_STARTED);
filter.addAction(Intent.ACTION_DREAMING_STOPPED);
mContext.registerReceiver(this, filter);
}
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(Intent.ACTION_SCREEN_ON)
|| action.equals(Intent.ACTION_DREAMING_STOPPED)) {
// possible transition to not-idle
if (mIdle) {
if (DEBUG) {
Slog.v(TAG, "exiting idle : " + action);
}
mAlarm.cancel(mIdleTriggerIntent);
mIdle = false;
reportNewIdleState(mIdle);
}
} else if (action.equals(Intent.ACTION_SCREEN_OFF)
|| action.equals(Intent.ACTION_DREAMING_STARTED)) {
// when the screen goes off or dreaming starts, we schedule the
// alarm that will tell us when we have decided the device is
// truly idle.
long when = SystemClock.elapsedRealtime() + INACTIVITY_IDLE_THRESHOLD;
if (DEBUG) {
Slog.v(TAG, "Scheduling idle : " + action + " when=" + when);
}
mAlarm.setWindow(AlarmManager.ELAPSED_REALTIME_WAKEUP,
when, IDLE_WINDOW_SLOP, mIdleTriggerIntent);
} else if (action.equals(ACTION_TRIGGER_IDLE)) {
// idle time starts now
if (!mIdle) {
if (DEBUG) {
Slog.v(TAG, "Idle trigger fired @ " + SystemClock.elapsedRealtime());
}
mIdle = true;
reportNewIdleState(mIdle);
}
}
}
}
}
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