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Replaced busy wait with wait()/notifyAll() idiom

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git-svn-id: https://zxing.googlecode.com/svn/trunk@206 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2008-02-15 17:51:43 +00:00
parent 4c4adc953e
commit 848f791d4f
1 changed files with 26 additions and 9 deletions
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35
android/src/com/google/zxing/client/android/WorkerThread.java
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@ -32,9 +32,11 @@ import com.google.zxing.Result;
*/
final class WorkerThread extends Thread {
private CameraSurfaceView surfaceView;
private CameraManager cameraManager;
private Handler handler;
private final CameraSurfaceView surfaceView;
private final CameraManager cameraManager;
private final Handler handler;
private final Object idleLock;
private State state;
private enum State {
IDLE,
@ -43,12 +45,11 @@ final class WorkerThread extends Thread {
DONE
}
private State state;
WorkerThread(CameraSurfaceView surfaceView, CameraManager cameraManager, Handler handler) {
this.surfaceView = surfaceView;
this.cameraManager = cameraManager;
this.handler = handler;
this.idleLock = new Object();
state = State.IDLE;
}
@ -57,10 +58,7 @@ final class WorkerThread extends Thread {
while (true) {
switch (state) {
case IDLE:
try {
sleep(50);
} catch (InterruptedException e) {
}
idle();
break;
case PREVIEW_LOOP:
surfaceView.capturePreviewAndDraw();
@ -89,18 +87,37 @@ final class WorkerThread extends Thread {
public void requestPreviewLoop() {
state = State.PREVIEW_LOOP;
wakeFromIdle();
}
public void requestStillAndDecode() {
state = State.STILL_AND_DECODE;
wakeFromIdle();
}
public void requestExitAndWait() {
state = State.DONE;
wakeFromIdle();
try {
join();
} catch (InterruptedException e) {
}
}
private void idle() {
try {
synchronized (idleLock) {
idleLock.wait();
}
} catch (InterruptedException ie) {
// continue
}
}
private void wakeFromIdle() {
synchronized (idleLock) {
idleLock.notifyAll();
}
}
}