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/*
* Copyright (C) 2010 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.hierarchyviewerlib.device;
import com.android.ddmlib.IDevice;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
/**
* This class handles automatic updating of the list of windows in the device
* selector for device with protocol version 3 or above of the view server. It
* connects to the devices, keeps the connection open and listens for messages.
* It notifies all it's listeners of changes.
*/
public class WindowUpdater {
private static HashMap<IDevice, ArrayList<IWindowChangeListener>> sWindowChangeListeners =
new HashMap<IDevice, ArrayList<IWindowChangeListener>>();
private static HashMap<IDevice, Thread> sListeningThreads = new HashMap<IDevice, Thread>();
public static interface IWindowChangeListener {
public void windowsChanged(IDevice device);
public void focusChanged(IDevice device);
}
public static void terminate() {
synchronized (sListeningThreads) {
for (IDevice device : sListeningThreads.keySet()) {
sListeningThreads.get(device).interrupt();
}
}
}
public static void startListenForWindowChanges(IWindowChangeListener listener, IDevice device) {
synchronized (sWindowChangeListeners) {
// In this case, a listening thread already exists, so we don't need
// to create another one.
if (sWindowChangeListeners.containsKey(device)) {
sWindowChangeListeners.get(device).add(listener);
return;
}
ArrayList<IWindowChangeListener> listeners = new ArrayList<IWindowChangeListener>();
listeners.add(listener);
sWindowChangeListeners.put(device, listeners);
}
// Start listening
Thread listeningThread = new Thread(new WindowChangeMonitor(device));
synchronized (sListeningThreads) {
sListeningThreads.put(device, listeningThread);
}
listeningThread.start();
}
public static void stopListenForWindowChanges(IWindowChangeListener listener, IDevice device) {
synchronized (sWindowChangeListeners) {
ArrayList<IWindowChangeListener> listeners = sWindowChangeListeners.get(device);
listeners.remove(listener);
// There are more listeners, so don't stop the listening thread.
if (listeners.size() != 0) {
return;
}
sWindowChangeListeners.remove(device);
}
// Everybody left, so the party's over!
Thread listeningThread;
synchronized (sListeningThreads) {
listeningThread = sListeningThreads.get(device);
sListeningThreads.remove(device);
}
listeningThread.interrupt();
}
private static IWindowChangeListener[] getWindowChangeListenersAsArray(IDevice device) {
IWindowChangeListener[] listeners;
synchronized (sWindowChangeListeners) {
ArrayList<IWindowChangeListener> windowChangeListenerList =
sWindowChangeListeners.get(device);
if (windowChangeListenerList == null) {
return null;
}
listeners =
windowChangeListenerList
.toArray(new IWindowChangeListener[windowChangeListenerList.size()]);
}
return listeners;
}
public static void notifyWindowsChanged(IDevice device) {
IWindowChangeListener[] listeners = getWindowChangeListenersAsArray(device);
if (listeners != null) {
for (int i = 0; i < listeners.length; i++) {
listeners[i].windowsChanged(device);
}
}
}
public static void notifyFocusChanged(IDevice device) {
IWindowChangeListener[] listeners = getWindowChangeListenersAsArray(device);
if (listeners != null) {
for (int i = 0; i < listeners.length; i++) {
listeners[i].focusChanged(device);
}
}
}
private static class WindowChangeMonitor implements Runnable {
private IDevice device;
public WindowChangeMonitor(IDevice device) {
this.device = device;
}
@Override
public void run() {
while (!Thread.currentThread().isInterrupted()) {
DeviceConnection connection = null;
try {
connection = new DeviceConnection(device);
connection.sendCommand("AUTOLIST");
String line;
while (!Thread.currentThread().isInterrupted()
&& (line = connection.getInputStream().readLine()) != null) {
if (line.equalsIgnoreCase("LIST UPDATE")) {
notifyWindowsChanged(device);
} else if (line.equalsIgnoreCase("FOCUS UPDATE")) {
notifyFocusChanged(device);
}
}
} catch (IOException e) {
} finally {
if (connection != null) {
connection.close();
}
}
}
}
}
}
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