redders wrote:
> Currently I have two threads, other than the UI thread, which need to
> communicate with each other.
Why?
> Thread one needs to be able to send
> messages directly to thread two, and vice versa.
Why?
> At the minute, my code looks like this:
>
> runnable1 = new myRunnable();
> runnable2 = new myOtherRunnable(runnable1);
> runnable1.setOtherRunnable(runnable2);
> sThread = new Thread(runnable1);
> sThread.start();
>
> Then, inside runnable1, I've got:
>
> public void run() {
> Thread otherThread = new Thread(runnable2);
> .....*snipped code*.....
> if (event){
> runnable2.sendMessage(message);
> otherThread.interrupt();
> }
> }
>
> Thread two is in a constant sleep loop, until he is interrupted, at
> which point he'll check his message queue and act on it.
If you elect to keep the threads, *please* consider using
java.util.concurrent.LinkedBlockingQueue and nuking the
interrupt()/sleep() code.
> Add the fact I'm going to add a third thread that will also need to
> send messages to and get messages from thread 2, which makes my head
> near to exploding point thinking about it.
Again, why do you have all of these manually-created threads? What are
they doing? Have you considered AsyncTask?
> Should I be using callbacks/interfaces? Is there a good place to read
> about this somewhere? I'm very new to this side of things really.
Tactically, there are some good books on concurrent programming in Java
out there. Anything involving Doug Lea would be a good choice.
Strategically, it feels to me as if you're going about your problem the
wrong way. I can see having one background thread, listening on a
LinkedBlockingQueue, as an alternative to AsyncTask. I don't know what
the other threads you are creating are supposed to be doing, but I can't
see how they're adding value.
Please remember that mobile devices have slow single-core CPUs (at
least, from the standpoint of application code), and so there really is
no parallel processing going on, unless you're blocking on I/O (in
Android's case, mostly network I/O).
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy
_Android Programming Tutorials_ Version 1.0 In Print!
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