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/*
* Copyright (C) 2015 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.tv.dvr;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.support.annotation.VisibleForTesting;
import android.util.Log;
import android.util.LongSparseArray;
import android.util.Range;
import com.android.tv.data.Channel;
import com.android.tv.data.ChannelDataManager;
import com.android.tv.util.Clock;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
* The core class to manage schedule and run actual recording.
*/
@VisibleForTesting
public class Scheduler implements DvrDataManager.ScheduledRecordingListener {
private static final String TAG = "Scheduler";
private static final boolean DEBUG = false;
private final static long SOON_DURATION_IN_MS = TimeUnit.MINUTES.toMillis(5);
@VisibleForTesting final static long MS_TO_WAKE_BEFORE_START = TimeUnit.MINUTES.toMillis(1);
/**
* Wraps a {@link RecordingTask} removing it from {@link #mPendingRecordings} when it is done.
*/
public final class HandlerWrapper extends Handler {
public static final int MESSAGE_REMOVE = 999;
private final long mId;
HandlerWrapper(Looper looper, ScheduledRecording scheduledRecording, RecordingTask recordingTask) {
super(looper, recordingTask);
mId = scheduledRecording.getId();
}
@Override
public void handleMessage(Message msg) {
// The RecordingTask gets a chance first.
// It must return false to pass this message to here.
if (msg.what == MESSAGE_REMOVE) {
if (DEBUG) Log.d(TAG, "done " + mId);
mPendingRecordings.remove(mId);
}
removeCallbacksAndMessages(null);
super.handleMessage(msg);
}
}
private final LongSparseArray<HandlerWrapper> mPendingRecordings = new LongSparseArray<>();
private final Looper mLooper;
private final DvrSessionManager mSessionManager;
private final WritableDvrDataManager mDataManager;
private final DvrManager mDvrManager;
private final ChannelDataManager mChannelDataManager;
private final Context mContext;
private final Clock mClock;
private final AlarmManager mAlarmManager;
public Scheduler(Looper looper, DvrManager dvrManager, DvrSessionManager sessionManager,
WritableDvrDataManager dataManager, ChannelDataManager channelDataManager,
Context context, Clock clock,
AlarmManager alarmManager) {
mLooper = looper;
mDvrManager = dvrManager;
mSessionManager = sessionManager;
mDataManager = dataManager;
mChannelDataManager = channelDataManager;
mContext = context;
mClock = clock;
mAlarmManager = alarmManager;
}
private void updatePendingRecordings() {
List<ScheduledRecording> scheduledRecordings = mDataManager.getRecordingsThatOverlapWith(
new Range(mClock.currentTimeMillis(),
mClock.currentTimeMillis() + SOON_DURATION_IN_MS));
// TODO(DVR): handle removing and updating exiting recordings.
for (ScheduledRecording r : scheduledRecordings) {
scheduleRecordingSoon(r);
}
}
/**
* Start recording that will happen soon, and set the next alarm time.
*/
public void update() {
if (DEBUG) Log.d(TAG, "update");
updatePendingRecordings();
updateNextAlarm();
}
@Override
public void onScheduledRecordingAdded(ScheduledRecording scheduledRecording) {
if (DEBUG) Log.d(TAG, "added " + scheduledRecording);
if (startsWithin(scheduledRecording, SOON_DURATION_IN_MS)) {
scheduleRecordingSoon(scheduledRecording);
} else {
updateNextAlarm();
}
}
@Override
public void onScheduledRecordingRemoved(ScheduledRecording scheduledRecording) {
long id = scheduledRecording.getId();
HandlerWrapper wrapper = mPendingRecordings.get(id);
if (wrapper != null) {
wrapper.removeCallbacksAndMessages(null);
mPendingRecordings.remove(id);
} else {
updateNextAlarm();
}
}
@Override
public void onScheduledRecordingStatusChanged(ScheduledRecording scheduledRecording) {
//TODO(DVR): implement
}
private void scheduleRecordingSoon(ScheduledRecording scheduledRecording) {
Channel channel = mChannelDataManager.getChannel(scheduledRecording.getChannelId());
RecordingTask recordingTask = new RecordingTask(scheduledRecording, channel, mDvrManager,
mSessionManager, mDataManager, mClock);
HandlerWrapper handlerWrapper = new HandlerWrapper(mLooper, scheduledRecording,
recordingTask);
recordingTask.setHandler(handlerWrapper);
mPendingRecordings.put(scheduledRecording.getId(), handlerWrapper);
handlerWrapper.sendEmptyMessage(RecordingTask.MESSAGE_INIT);
}
private void updateNextAlarm() {
long lastStartTimePending = getLastStartTimePending();
long nextStartTime = mDataManager.getNextScheduledStartTimeAfter(lastStartTimePending);
if (nextStartTime != DvrDataManager.NEXT_START_TIME_NOT_FOUND) {
long wakeAt = nextStartTime - MS_TO_WAKE_BEFORE_START;
if (DEBUG) Log.d(TAG, "Set alarm to record at " + wakeAt);
Intent intent = new Intent(mContext, DvrStartRecordingReceiver.class);
PendingIntent alarmIntent = PendingIntent.getBroadcast(mContext, 0, intent, 0);
//This will cancel the previous alarm.
mAlarmManager.set(AlarmManager.RTC_WAKEUP, wakeAt, alarmIntent);
} else {
if (DEBUG) Log.d(TAG, "No future recording, alarm not set");
}
}
private long getLastStartTimePending() {
// TODO(DVR): implement
return mClock.currentTimeMillis();
}
@VisibleForTesting
boolean startsWithin(ScheduledRecording scheduledRecording, long durationInMs) {
return mClock.currentTimeMillis() >= scheduledRecording.getStartTimeMs() - durationInMs;
}
}
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