Re: [zeromq-dev] fun with Java API

Joshua Foster Thu, 15 Nov 2012 15:23:37 -0800

The bindings have JavaDoc. You can generate it with the maven build. I don't use the Z* objects. I usually use the ZMQ.*

ZMQ.Context context = ZMQ.context(1);
etc...

Joshua

Peter Friend

Thursday, November 15, 2012 5:13 PM

Perhaps I have missed it, but as far as I can tell there is no up-to-date reference for the Java zeromq bindings. But that's a minor issue as I can RTFS...

This has been a source of annoyance:

   public ZContext() {
      context = null;      // Don't create Context until create 1st 0MQ socket
      sockets = new CopyOnWriteArrayList<Socket>();
      ioThreads = 1;
      linger = 0;
      main = true;
   }

I am not sure why the context is not created at this point, but it can cause problems if you have an object which has callback hooks for registering/unregistering the sockets on a Poller. I create my objects which create their sockets and manage their connections, but I need to create a Poller before that point whether I am passing in the Poller explicitly, or referring to a global copy from an overridden method. Creating a socket and then ditching it is a workaround, but is annoying and you have to have a loud comment there so someone doesn't accidentally delete your obviously lame code which is creating a socket then immediately closing it. I am proposing this solution:

public Context getContext() {
      if (isMain() && context == null)
         context = ZMQ.context(ioThreads);
      return context;
  }

Of course if you want >1 thread you have to set that value before calling createSocket() or getContext().

Cheers,

Peter

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Re: [zeromq-dev] fun with Java API

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