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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.job.controllers;
import java.io.PrintWriter;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.SystemClock;
import android.os.UserHandle;
import android.util.ArraySet;
import android.util.Slog;
import com.android.server.am.ActivityManagerService;
import com.android.server.job.JobSchedulerService;
import com.android.server.job.StateChangedListener;
public final 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 long mInactivityIdleThreshold;
private long mIdleWindowSlop;
final ArraySet<JobStatus> mTrackedTasks = new ArraySet<>();
IdlenessTracker mIdleTracker;
// Singleton factory
private static Object sCreationLock = new Object();
private static volatile IdleController sController;
public static IdleController get(JobSchedulerService service) {
synchronized (sCreationLock) {
if (sController == null) {
sController = new IdleController(service, service.getContext(), service.getLock());
}
return sController;
}
}
private IdleController(StateChangedListener stateChangedListener, Context context,
Object lock) {
super(stateChangedListener, context, lock);
initIdleStateTracking();
}
/**
* StateController interface
*/
@Override
public void maybeStartTrackingJobLocked(JobStatus taskStatus, JobStatus lastJob) {
if (taskStatus.hasIdleConstraint()) {
mTrackedTasks.add(taskStatus);
taskStatus.setTrackingController(JobStatus.TRACKING_IDLE);
taskStatus.setIdleConstraintSatisfied(mIdleTracker.isIdle());
}
}
@Override
public void maybeStopTrackingJobLocked(JobStatus taskStatus, JobStatus incomingJob,
boolean forUpdate) {
if (taskStatus.clearTrackingController(JobStatus.TRACKING_IDLE)) {
mTrackedTasks.remove(taskStatus);
}
}
/**
* Interaction with the task manager service
*/
void reportNewIdleState(boolean isIdle) {
synchronized (mLock) {
for (int i = mTrackedTasks.size()-1; i >= 0; i--) {
mTrackedTasks.valueAt(i).setIdleConstraintSatisfied(isIdle);
}
}
mStateChangedListener.onControllerStateChanged();
}
/**
* Idle state tracking, and messaging with the task manager when
* significant state changes occur
*/
private void initIdleStateTracking() {
mInactivityIdleThreshold = mContext.getResources().getInteger(
com.android.internal.R.integer.config_jobSchedulerInactivityIdleThreshold);
mIdleWindowSlop = mContext.getResources().getInteger(
com.android.internal.R.integer.config_jobSchedulerIdleWindowSlop);
mIdleTracker = new IdlenessTracker();
mIdleTracker.startTracking();
}
final class IdlenessTracker extends BroadcastReceiver {
private AlarmManager mAlarm;
private PendingIntent mIdleTriggerIntent;
boolean mIdle;
boolean mScreenOn;
public IdlenessTracker() {
mAlarm = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(ActivityManagerService.ACTION_TRIGGER_IDLE)
.setPackage("android")
.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
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;
mScreenOn = true;
}
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);
// Debugging/instrumentation
filter.addAction(ActivityManagerService.ACTION_TRIGGER_IDLE);
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)) {
if (DEBUG) {
Slog.v(TAG,"exiting idle : " + action);
}
mScreenOn = true;
//cancel the alarm
mAlarm.cancel(mIdleTriggerIntent);
if (mIdle) {
// possible transition to not-idle
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.
final long nowElapsed = SystemClock.elapsedRealtime();
final long when = nowElapsed + mInactivityIdleThreshold;
if (DEBUG) {
Slog.v(TAG, "Scheduling idle : " + action + " now:" + nowElapsed + " when="
+ when);
}
mScreenOn = false;
mAlarm.setWindow(AlarmManager.ELAPSED_REALTIME_WAKEUP,
when, mIdleWindowSlop, mIdleTriggerIntent);
} else if (action.equals(ActivityManagerService.ACTION_TRIGGER_IDLE)) {
// idle time starts now. Do not set mIdle if screen is on.
if (!mIdle && !mScreenOn) {
if (DEBUG) {
Slog.v(TAG, "Idle trigger fired @ " + SystemClock.elapsedRealtime());
}
mIdle = true;
reportNewIdleState(mIdle);
} else {
if (DEBUG) {
Slog.v(TAG, "TRIGGER_IDLE received but not changing state; idle="
+ mIdle + " screen=" + mScreenOn);
}
}
}
}
}
@Override
public void dumpControllerStateLocked(PrintWriter pw, int filterUid) {
pw.print("Idle: ");
pw.println(mIdleTracker.isIdle());
pw.print("Tracking ");
pw.print(mTrackedTasks.size());
pw.println(":");
for (int i = 0; i < mTrackedTasks.size(); i++) {
final JobStatus js = mTrackedTasks.valueAt(i);
if (!js.shouldDump(filterUid)) {
continue;
}
pw.print(" #");
js.printUniqueId(pw);
pw.print(" from ");
UserHandle.formatUid(pw, js.getSourceUid());
pw.println();
}
}
}
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