[zeromq-dev] fun with Java API

Joshua Foster jhawk28 at gmail.com
Fri Nov 16 00:23:18 CET 2012


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 <mailto:pfriend at gehrytech.com>
> 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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> zeromq-dev at lists.zeromq.org
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