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  • Get attributes(events of channel) when subscibers connect/disconnect

    Hi,

    I have a requirement where in i want to get notification when the first subscriber hooks(may be with some service activator) into the channel .

    Also i need notifications when the last subscriber unregisters from the channel.

    That is, I want notification when the number of listeners on channel becomes 1 or 0 ? This is because when first guy subscribers to this channel i want some jms adapter to get activated ,similarly when the last guy unsubscribes i want to dynamically stop the jms adapters.


    Currently i am using AOP to get subscriber on pub-sub-channel. But i have to take the additional pain of maintaining the count of the subscribers .

    @Pointcut("execution(* org.springframework.integration.channel.Subscribab leChannel.subscribe(..))")
    private void subscribe() {
    }

    @Before("subscribe() &&" + "args(arg) &&" + "this(channel)")
    public void beforeAdvice(MessageHandler arg,MessageChannel channel)
    {
    ........
    }



    Is there any internal property of the channel which i can use for all the above mentioned cases and dynamically start stop adapters connected to it ?
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