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/* //device/java/android/com/android/tests/TestHandler.java
**
** Copyright 2007, 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 android.core;
import com.android.internal.os.HandlerHelper;
import android.os.HandlerInterface;
import android.os.Looper;
import android.os.Message;
import android.os.SystemClock;
/**
* Naive class that implements a getNextMessage()
* by running a Handler in a new thread. <p>
* <p/>
* This class blocks the Handler thread when the getNextMessage() thread
* is not in getNextMessage(). This allows the getNextMessage() thread to
* inspect state that is otherwise unguarded and would otherwise be prone to
* race conditions.<p>
* <p/>
* Please note that both threads are allowed to run unsynchronized until
* the first message is posted to this handler.
* <p/>
* Please call hh.looper.quit() when done to clean this up
*/
public class TestHandler implements Runnable, HandlerInterface {
//***** Instance Variables
public HandlerHelper hh;
public Looper looper;
Runnable setupRoutine;
Message nextMessage;
long failTimeoutMillis;
boolean waitBeforeReturning = true;
//***** Class Methods
public static TestHandler create() {
return create("TestHandler", null);
}
public static TestHandler create(String name) {
return create(name, null);
}
public static TestHandler create(String name, Runnable doSetup) {
TestHandler ret;
ret = new TestHandler();
ret.setupRoutine = doSetup;
synchronized (ret) {
new Thread(ret, name).start();
while (ret.looper == null) {
try {
ret.wait();
} catch (InterruptedException ex) {
}
}
}
return ret;
}
//***** Public Methods
/**
* Maximum time to wait for a message before failing
* by throwing exception
*/
public void setFailTimeoutMillis(long msec) {
failTimeoutMillis = msec;
}
/**
* Waits for the next message to be sent to this handler and returns it.
* Blocks the Handler's looper thread until another call to getNextMessage()
* is made
*/
public Message getNextMessage() {
Message ret;
synchronized (this) {
long time = SystemClock.uptimeMillis();
waitBeforeReturning = false;
this.notifyAll();
try {
while (nextMessage == null) {
if (failTimeoutMillis > 0
&& ((SystemClock.uptimeMillis() - time)
> failTimeoutMillis)) {
throw new RuntimeException("Timeout exceeded exceeded");
}
try {
this.wait(failTimeoutMillis);
} catch (InterruptedException ex) {
}
}
ret = nextMessage;
nextMessage = null;
} finally {
waitBeforeReturning = true;
}
}
return ret;
}
//***** Overridden from Runnable
public void run() {
Looper.prepare();
hh = new HandlerHelper(this);
if (setupRoutine != null) {
setupRoutine.run();
}
synchronized (this) {
looper = Looper.myLooper();
this.notify();
}
Looper.loop();
}
//***** HandlerHelper implementation
public void handleMessage(Message msg) {
synchronized (this) {
while (nextMessage != null) {
try {
this.wait();
} catch (InterruptedException ex) {
}
}
// msg will be recycled when this method returns.
// so we need to make a copy of it.
nextMessage = Message.obtain();
nextMessage.copyFrom(msg);
this.notifyAll();
while (waitBeforeReturning) {
try {
this.wait();
} catch (InterruptedException ex) {
}
}
}
}
}
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