如何在ThreadPoolExecutor中删除旧的排队任务并插入新任务？

Question

I load a lot of images form internet with a ThreadPoolExecutor.

When new images found, I need to render it first, in that case I want to abandon the old tasks which are still queued in the ThreadPoolExecutor and added these new items to download.

I found there are no "clear queue" method in ThreadPoolExecutor, and "purge" method sounds like not good for this.

What should I do?

I just thought to call "shutdown" of this executor and recreate a new one to do this, not sure whether it is appropriate.

Answer 1

Have you tried this?

ThreadPoolExecutor pool = .....;  pool.remove(task);

task is the Runnable you want to remove.

or if you want to clear the queue.

pool.getQueue().clear() 

Answer 2

ThreadPoolExecutor has a remove() method. You can use that in conjunction with getQueue() or keep your own collection of Runnable s that have been queue and might need removal. If you keep your own collection, remember to have some mechinism that removes the runnable from your collection when it has finished.