mudhorn/zxing
1
0
Fork 0
mirror of https://github.com/zxing/zxing.git synced 2025-02-21 02:55:27 -08:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

35
android/src/com/google/zxing/client/android/WorkerThread.java
View file

@ -32,9 +32,11 @@ import com.google.zxing.Result;
*/ */
final class WorkerThread extends Thread { final class WorkerThread extends Thread {
private CameraSurfaceView surfaceView; private final CameraSurfaceView surfaceView;
private CameraManager cameraManager; private final CameraManager cameraManager;
private Handler handler; private final Handler handler;
private final Object idleLock;
private State state;
private enum State { private enum State {
IDLE, IDLE,
@ -43,12 +45,11 @@ final class WorkerThread extends Thread {
DONE DONE
} }
private State state;
WorkerThread(CameraSurfaceView surfaceView, CameraManager cameraManager, Handler handler) { WorkerThread(CameraSurfaceView surfaceView, CameraManager cameraManager, Handler handler) {
this.surfaceView = surfaceView; this.surfaceView = surfaceView;
this.cameraManager = cameraManager; this.cameraManager = cameraManager;
this.handler = handler; this.handler = handler;
this.idleLock = new Object();
state = State.IDLE; state = State.IDLE;
} }
@ -57,10 +58,7 @@ final class WorkerThread extends Thread {
while (true) { while (true) {
switch (state) { switch (state) {
case IDLE: case IDLE:
try { idle();
sleep(50);
} catch (InterruptedException e) {
}
break; break;
case PREVIEW_LOOP: case PREVIEW_LOOP:
surfaceView.capturePreviewAndDraw(); surfaceView.capturePreviewAndDraw();
@ -89,18 +87,37 @@ final class WorkerThread extends Thread {
public void requestPreviewLoop() { public void requestPreviewLoop() {
state = State.PREVIEW_LOOP; state = State.PREVIEW_LOOP;
wakeFromIdle();
} }
public void requestStillAndDecode() { public void requestStillAndDecode() {
state = State.STILL_AND_DECODE; state = State.STILL_AND_DECODE;
wakeFromIdle();
} }
public void requestExitAndWait() { public void requestExitAndWait() {
state = State.DONE; state = State.DONE;
wakeFromIdle();
try { try {
join(); join();
} catch (InterruptedException e) { } catch (InterruptedException e) {
} }
} }
private void idle() {
try {
synchronized (idleLock) {
idleLock.wait();
}
} catch (InterruptedException ie) {
// continue
}
}
private void wakeFromIdle() {
synchronized (idleLock) {
idleLock.notifyAll();
}
}
} }