Essentially what I want is a BlockingQueue of size=1. I have a "listener" thread that simply waits, blocking until an object is put into the queue, and then retrieves it--and a "producer" thread that actually puts the object into the queue.
I can implement this with some synchronized blocks and a BlockingQueue implementation, but that seems like overkill. Is there a better, simpler way to do what I want?
Example interface:
public interface Wait<T> {
/**
* If "put" has never been called on this object, then this method will
* block and wait until it has. Once "put" has been called with some T, this
* method will return that T immediately.
*/
public T get() throws InterruptedException;
/**
* @param object The object to return to callers of get(). If called more
* than once, will throw an {@link IllegalStateException}.
*/
public void put(T object);
}