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From "Thomas R. Corbin" <thomas.cor...@gmail.com>
Subject Re: Not quite sure where to go next - network bridging, reliable delivery, store and forward.
Date Wed, 01 Oct 2008 16:30:27 GMT
On Wednesday 01 October 2008, Thomas R. Corbin said:
> Now, it seems like the recommendation is for Master/Slave for reliable
> delivery, but I don't think we can do that.
>
> We've got field laptops which may or may not have connectivity with the
> central office, but they want to be able to run the application and have it
> send messages that get delivered when the network comes up.
>
> And the client wants the central office to be able to send assignments to
> the field whether or not the network to the field laptop is up.
>
> So for the field laptops I've set up an embedded broker which then connects
> to a central office broker.   The reason is that the application won't come
> up if there isn't a local broker that it can connect to.  If the
> application is started w/o a local broker or a connection to the central
> office it doesn't come up.   Plus, I wanted the local message persistence
> so that the user of the application can trigger messages to be sent even
> when the connection to the central office isn't present.
>
> In the central office we've get server processes also with embedded
> brokers.
>
> I've been fiddling with the setup configuration for the embedded brokers
> and the central office brokers and I've gotten to the point that messages
> from the field get sent to the central office on reconnect, but don't get
> sent from the central office to the field on reconnect.
>
> And everything works if everything is connected.   But if the laptop isn't
> connected to the central office when the central office sends out
> assignments to the field, then the laptop will never see those messages.
>
> I've tried using durable subscription topics, I've tried setting
> "conduitSubscriptions" to both true and false - and I'm not sure if I
> should set it one way for the central office broker and the same or
> different for the laptop and server process embedded brokers.
>
> The network kind of looks like this:
>
> Field laptop|---------|central office broker|-----|Server Process|
>
> The central office broker is intended to be the "master", in as much as
> there is a master - this isn't really a master/slave setup.
>
> I can use JMX to look at the enqueue/dequeue counts to see where messages
> are getting hung up - but I am not ever sure why.
>
> I had thought that with durable subscriptions, the messages would get sent,
> but that *seems* not to be the case.
>
> I have looked through ActiveMQ bug reports and the online documentation. 
> Of which there is a lot, but I am still quite confused.
>
> Seeing as how I'm doing the embedded broker set up in Groovy, rather than
> in spring or xbean - should I explicitly be using a DemandForwardingBridge
> as in the ThreeBroker tests?   Or does the underlying code just use it
> anyway?
>
> What would that imply for the activemq.xml config file for the master
> broker? Is there configuration that explicitly says use a
> DemandForwardingBridge?  Or is the DemandForwardingBridge not the issue?
>
> What should these values be set to?
>
>                         decreaseNetworkConsumerPriority="false"
>                         conduitSubscriptions="true"
>                         bridgeTempDestinations="true"
>                         duplex="true"
>
> Sorry for such a newbie set of questions and so long an email.

I forgot to mention that I'm on 5.1.0

-- 
Card #1. Uncle Bob’s Three Laws

• Write no production code except to pass a failing test.
• Write only enough of a test to demonstrate a failure.
• Write only enough production code to pass the test.


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