Thread notification with a response

Hi
I have a thread waiting on a string. The notifying thread do not have any idea who the waiting guy is and they do not share any common object either other than the string. I want to send back some information to the waiting thread when notifying it. And there are multiple thread-couples like this. How can I do it. I could use a hashmap to store the String object and the waiting thread. The notifier first looks up the waiting thread and sets the response and then notifies it. But this doesn't look very elegant. Anything in concurrent api's to take care of this? Or maybe I have missed on a very simple solution?
Biblio

Well, they share the string. In fact the notifier has another instance of the string and then I am calling intern on that to get the same instance as is with the waiting thread. String is the only object I can share in this case without maintaining a map on my side (vm does that for me). And I do not want to use any map. Can I use something like an exchanger? But again both the threads can't share the same exchanger either.
The code looks like
in Thread A -->
"someString".wait()
in Thread B -->
get "someString" contents from somewhere
some other data to be sent to the waiting thread
"someString".intern().notify()

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Go to Solution.

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