Java线程连接问题
线程:Java线程连接问题,java,multithreading,swt,eclipse-rcp,Java,Multithreading,Swt,Eclipse Rcp,线程: public void setGifImage(InputStream inputStream) { checkWidget(); if (thread != null) { thread.stopRunning(); try { thread.join(); } catch (InterruptedException e) {
public void setGifImage(InputStream inputStream) {
checkWidget();
if (thread != null) {
thread.stopRunning();
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
ImageLoader loader = new ImageLoader();
try {
loader.load(inputStream);
} catch (Exception e) {
this.image = null;
return;
}
if (loader.data[0] != null){
System.out.println("set to new picture");
this.image = new Image(this.getDisplay(), loader.data[0]);
}
if (loader.data.length > 1) {
System.out.println("start animation");
thread = new GifThread(loader);
thread.start();
}else{
System.out.println("paint static picture");
}
redraw();
}
输出:private class GifThread extends Thread {
private int imageNumber = 0;
private ImageLoader loader = null;
private boolean run = true;
public GifThread(ImageLoader loader) {
this.loader = loader;
}
public void run() {
while (run) {
int delayTime = loader.data[imageNumber].delayTime;
try {
Thread.sleep(delayTime * 10);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (!GifCLabel.this.isDisposed()) {
// if a asynchronous thread is running, this new runnable will be queued
GifCLabel.this.getDisplay().asyncExec(new Runnable() {
public void run() {
if (!GifCLabel.this.isDisposed()) {
imageNumber = imageNumber == loader.data.length - 1 ? 0 : imageNumber + 1;
if (!GifCLabel.this.image.isDisposed())
GifCLabel.this.image.dispose();
ImageData nextFrameData = loader.data[imageNumber];
System.out.println("set to frame " + imageNumber);
GifCLabel.this.image = new Image(GifCLabel.this.getDisplay(), nextFrameData);
GifCLabel.this.redraw();
} else
stopRunning();
}
});
} else
stopRunning();
}
}
public void stopRunning() {
run = false;
}
}
我想知道为什么线程仍然在thread.join()之后运行?正如我所知,thread.join()等待线程死亡,但您可以看到输出中的最后一行,线程在死亡后运行 这里的问题是线程调用
getDisplay().asyncExec()
,它基本上向UI线程发送事件,以执行打印“设置为帧”
的Runnable
最好使用syncExec()
并在Runnable中检查run
变量状态
另一个提示:
InterruptedException
而什么也不做不是一个好主意interrupt
内部stopRunnable()
睡眠
结束后,检查运行
变量状态Max您确定要加入的线程与从中查看日志的线程相同吗?换句话说,没有创建额外的线程?(您应该使该方法同步)谢谢您的关注。要同步的方法是什么?作为Max的答案,这也能解决我的问题吗?虽然我的问题已经解决,但我想了解更多关于线程的知识:DMax和我都认为您加入的线程不是执行工作的线程。我的想法是,可能您的setGifImage方法正在被并发访问;如果一个线程连接了两次,并且创建了一个未连接的线程,那么这是真的。如果您确信您的方法没有被并发调用,那么不需要更改任何内容;在其他地方,您可以使其同步。
2011-08-10 03:44:24 DEBUG - 日志服务Ready!
2011-08-10 03:44:28 DEBUG - current is null
2011-08-10 03:44:28 DEBUG - found : amarsoft.dbmp.function.ui.FunctionListPage@1079ff
2011-08-10 03:44:28 DEBUG - can go back ? false
2011-08-10 03:44:28 DEBUG - can go forward ? false
set to new picture
start animation
2011-08-10 03:44:28 DEBUG - 尝试连接至 - jdbc:mysql://localhost:3306/credit 驱动配置:MySQL 驱动类:com.mysql.jdbc.Driver@1f7abae 连接属性:{user=root, password=root}
set to frame 1
set to frame 2
set to frame 3
set to frame 4
[amarsoft.dbmp.function.ui.FunctionListPage$1@29f93b, amarsoft.dbmp.function.ui.FunctionView$1@1a998c7]
set to new picture
paint static picture
set to frame 5