Creating Blocking Methods

[Singing Boyo]

How do you write a method that blocks until a condition is fulfilled to continue, other than using a while loop to wait for the condition.
e.g.

public void myBlockingMethod(){
     when(condition.isFullfilled());
}

I've been googling it, but I haven't been able to find any good articles. Any links/hints/old code is appreciated.

Thanks,
Singing Boyo

[Supamagier]

public final Object waitObj = new Object();

public void myBlockingMethod() {
    synchronized(waitObj) {
        while (!condition.isFullfilled())
            waitObj.wait(); // throws exception, cba to add it here
    }
}

As soon as you full fill the condition, use:

synchronized(waitObj) {
    waitObj.notifyAll();
}

~Matt

[masijade]

wait and notify

See Lesson: Concurrency (The Java™ Tutorials > Essential Classes)

Edit: A bit slow.

[Singing Boyo]

Hmm... was hoping to avoid creating numerous threads, though it may be unavoidable.

[masijade]

I'm sorry, but how would this "condition be fulfilled" if another thread did not fulfill it? Or are you trying to "wait" until an FTP is finished, or something like that?

[Singing Boyo]

It's a server/client program. I'm trying to create an extension of ServerSocket that allows threads to request sockets from a specified InetAddress, so that they can retrieve new connections by their client. (The Server "talks" to the client through multiple Sockets)