如何在ThreadFactory中创建线程期间访问Runnable？

Question

I have a ThreadPoolExecutor I've created with a custom ThreadFactory . When I call the execute() method passing my Runnable , a new Thread is created using my custom ThreadFactory . The problem is I can't find a way to access information inside the Runnable .

For example, I have a class Job that implements Runnable . Inside Job , I have a property A that I would like to access in the newThread() method of my custom ThreadFactory . The problem is that I can't cast the Runnable passed as parameter to Job since it's not a Job instance, it is an instance of the ThreadPoolExecutor.Worker class, and this class is private .

Answer 1

You are either misusing or misunderstanding what thread pool does. The process of creating threads and submitting/running tasks is completely decoupled. Thread pool decides when create a new thread and it might not be related to any new task submitted at all.

And finally remember that one thread is most likely reused across several Runnable s.