I have a class that takes objects from a BlockingQueue
and processes them by calling take()
in a continuous loop. At some point I know that no more objects will be added to the queue. How do I interrupt the take()
method so that it stops blocking?
Here's the class that processes the objects:
public class MyObjHandler implements Runnable {
private final BlockingQueue<MyObj> queue;
public class MyObjHandler(BlockingQueue queue) {
this.queue = queue;
}
public void run() {
try {
while (true) {
MyObj obj = queue.take();
// process obj here
// ...
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
And here's the method that uses this class to process objects:
public void testHandler() {
BlockingQueue<MyObj> queue = new ArrayBlockingQueue<MyObj>(100);
MyObjectHandler handler = new MyObjectHandler(queue);
new Thread(handler).start();
// get objects for handler to process
for (Iterator<MyObj> i = getMyObjIterator(); i.hasNext(); ) {
queue.put(i.next());
}
// what code should go here to tell the handler
// to stop waiting for more objects?
}
If interrupting the thread is not an option, another is to place a "marker" or "command" object on the queue that would be recognized as such by MyObjHandler and break out of the loop.