From: "list. rb" <list.rb@...>
Date: 2007-07-01T13:09:39+09:00
Subject: Re: Ruby vs Java (this,self/main)

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Awesome Charles.

I had to make one change to your suggestion:
class MySubscriber < com.feed.service.PFSubscriber
  def newEvent(event)
    puts event
  end
end

For some reason, the other syntax was throwing an error.

Thanks a million for the help

On 6/30/07, Charles Oliver Nutter <charles.nutter@sun.com> wrote:
>
> list. rb wrote:
> > ###### Ruby Version:
> > df = Java::Establisher.connect(user_pass_etc, "FeedSubscriberPublisher")
> > pfconn = Java::FSStarter.startConn(df, self)
> > pfconn.start
> > puts "Subscribing to Feed events"
> > pfconn.subscribe("PFEventFeedUpdate")
> > def newEvent(event)
> >            puts event
> > end
> >
> >
> > The Ruby version breaks when providing 'self' as the 'this' equivalent
> when
> > connecting(line two in the ruby script, here it is in IRB):
>
> I think the problem here is that the "self" you're passing doesn't
> implement whatever interfaces you need on the Java side.
>
> Because we have to match the static types Java's looking for, simply
> implementing the method isn't enough; you need to give JRuby a chance to
> actually create a real Java type:
>
> class MySubscriber
>    include Java::PFSubscriber
>
>    def newEvent(event)
>      puts event
>    end
> end
> df = Java::Establisher.connect(user_pass_etc, "FeedSubscriberPublisher")
> pfconn = Java::FSStarter.startConn(df, MySubscriber.new)
> pfconn.start
> puts "Subscribing to Feed events"
> pfconn.subscribe("PFEventFeedUpdate")
>
> There's also some shortcut syntaxes that are somewhat experimental, but
> make this process a little easier:
>
> pfconn = Java::FSStarter.startConn(df, PFSubscriber.impl {|method,
> *args| puts args[0]})
>
> - Charlie
>
>

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