Re: Java Executor framework and blocking IO.

Knute Johnson <>
Sun, 13 Sep 2009 17:38:49 -0700
The Dude wrote:

Close the socket!

...but this assumes I know my Runnable contains a socket.

If my only handle on the Thread is a Future object then I do not see
how I can close the socket when I invoke cancel() on the Future.



You're right if you don't know what's in your Runnable it's going to be
hard to close the socket. But you said "I am working on an application
where I launch a number of blocking server sockets, each in a different

I'm a firm believer that simpler is usually better than complicated or
tricky for a bunch of reasons. I would forget the Future and just use a
simple thread and close the socket if you want out of the blocking I/O.

I've written this sort of thing many times. Create a task class that
either has it's own thread or is executed by an Executor. You will have
a control program and it needs a reference to that task class. The task
class will have a stop method that closes the socket or whatever is
necessary to cause the task to end abruptly. When the control program
wants to stop the task it calls its stop method and removes the
reference from the list and it's done and soon gone.

You can make this a lot more complicated but the above works just fine
unless you need to scale this to very large numbers.


Knute Johnson
email s/nospam/knute2009/

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