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NotificationClient.java
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NotificationClient.java
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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import java.util.LinkedList;
import java.util.concurrent.ConcurrentHashMap;
import android.app.PendingIntent;
import android.text.TextUtils;
import android.util.Log;
/**
* Client for posting notifications through a NotificationHandler.
*/
public abstract class NotificationClient {
private static final String LOGTAG = "GeckoNotificationClient";
private volatile NotificationHandler mHandler;
private boolean mReady;
private final LinkedList<Runnable> mTaskQueue = new LinkedList<Runnable>();
private final ConcurrentHashMap<Integer, UpdateRunnable> mUpdatesMap =
new ConcurrentHashMap<Integer, UpdateRunnable>();
/**
* Runnable that is reused between update notifications.
*
* Updates happen frequently, so reusing Runnables prevents frequent dynamic allocation.
*/
private class UpdateRunnable implements Runnable {
private long mProgress;
private long mProgressMax;
private String mAlertText;
final private int mNotificationID;
public UpdateRunnable(int notificationID) {
mNotificationID = notificationID;
}
public synchronized boolean updateProgress(long progress, long progressMax, String alertText) {
if (progress == mProgress
&& mProgressMax == progressMax
&& TextUtils.equals(mAlertText, alertText)) {
return false;
}
mProgress = progress;
mProgressMax = progressMax;
mAlertText = alertText;
return true;
}
@Override
public void run() {
long progress;
long progressMax;
String alertText;
synchronized (this) {
progress = mProgress;
progressMax = mProgressMax;
alertText = mAlertText;
}
mHandler.update(mNotificationID, progress, progressMax, alertText);
}
};
/**
* Adds a notification.
*
* @see NotificationHandler#add(int, String, String, String, PendingIntent, PendingIntent)
*/
public synchronized void add(final int notificationID, final String aImageUrl,
final String aAlertTitle, final String aAlertText, final PendingIntent contentIntent) {
mTaskQueue.add(new Runnable() {
@Override
public void run() {
mHandler.add(notificationID, aImageUrl, aAlertTitle, aAlertText, contentIntent);
}
});
notify();
if (!mReady) {
bind();
}
}
/**
* Updates a notification.
*
* @see NotificationHandler#update(int, long, long, String)
*/
public void update(final int notificationID, final long aProgress, final long aProgressMax,
final String aAlertText) {
UpdateRunnable runnable = mUpdatesMap.get(notificationID);
if (runnable == null) {
runnable = new UpdateRunnable(notificationID);
mUpdatesMap.put(notificationID, runnable);
}
// If we've already posted an update with these values, there's no
// need to do it again.
if (!runnable.updateProgress(aProgress, aProgressMax, aAlertText)) {
return;
}
synchronized (this) {
if (mReady) {
mTaskQueue.add(runnable);
notify();
}
}
}
/**
* Removes a notification.
*
* @see NotificationHandler#remove(int)
*/
public synchronized void remove(final int notificationID) {
if (!mReady) {
return;
}
mTaskQueue.add(new Runnable() {
@Override
public void run() {
mHandler.remove(notificationID);
mUpdatesMap.remove(notificationID);
}
});
notify();
}
/**
* Determines whether a notification is showing progress.
*
* @see NotificationHandler#isProgressStyle(int)
*/
public boolean isProgressStyle(int notificationID) {
final NotificationHandler handler = mHandler;
return handler != null && handler.isProgressStyle(notificationID);
}
protected void bind() {
mReady = true;
}
protected void unbind() {
mReady = false;
mUpdatesMap.clear();
}
protected void connectHandler(NotificationHandler handler) {
mHandler = handler;
new Thread(new NotificationRunnable()).start();
}
private class NotificationRunnable implements Runnable {
@Override
public void run() {
Runnable r;
try {
while (true) {
// Synchronize polls to prevent tasks from being added to the queue
// during the isDone check.
synchronized (NotificationClient.this) {
r = mTaskQueue.poll();
while (r == null) {
if (mHandler.isDone()) {
unbind();
return;
}
NotificationClient.this.wait();
r = mTaskQueue.poll();
}
}
r.run();
}
} catch (InterruptedException e) {
Log.e(LOGTAG, "Notification task queue processing interrupted", e);
}
}
}
}