ActiveMQ vs ?

[Chris Neal <cn...@hayes-lemmerz.com>]

I am starting to work on a project that requires us to Post events from our
ERP application. (Mine happens to be in IBM U2 (Unidata) and I have
previously posted a message about the best way to communicate.  Unfortunatly
there is no STOMP interface for UniBasic.  While Unidata has a CallC
interface and it might be possible to utilize the C library for now we were
just thinking of using the REST interface.   

So, First up connecting to the REST interface.   So what is the correct URL
for the rest interface?
http://server:8161/ ?  When I look at the demo interface (of the 5.0
SNAPSHOT) I see send the sendto post to
http://server:8161/demo/message/FOO/BAR Is that the correct URL?

Next up.. The test.. If I'm using a single JMS server (for now) and I send a
message via the REST interface.  Next I stop the ActiveMQ server.. When I
restart the ActiveMQ Server I don't even see the Queues that were created..
Let alone the message that was in the queue. (Even if persistant delivery)
is selected... So without setting up a CLUSTER of ActiveMQ servers.   How do
I get the JMS server to maintain the state of the messages?  (i.e. Don't
loose them)

Thanks in advance for your responses.. and forgive me for being a JMS
newbie!
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Re: ActiveMQ vs ?

[marlet <vp...@freenet.de>]

James.Strachan wrote:
> 
> On 7/21/07, Chris Neal <cn...@hayes-lemmerz.com> wrote:
> 
>> Let alone the message that was in the queue. (Even if persistant
>> delivery)
>> is selected... So without setting up a CLUSTER of ActiveMQ servers.   How
>> do
>> I get the JMS server to maintain the state of the messages?  (i.e. Don't
>> loose them)
> 
> You don't loose them; the destinations don't appear by default until
> you produce/consume from them.
> 

You don't loose the messages, thats right, but only if you add the field
'JMSDeliveryMode=persistent' to the POST.
Without this, your message will be non-persistent.
Unfortunately, the documentation doesn't tell you about that (at least I
couldn't find
it anywhere).

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Re: ActiveMQ vs ?

[James Strachan <ja...@gmail.com>]

On 7/21/07, Chris Neal <cn...@hayes-lemmerz.com> wrote:
> I am starting to work on a project that requires us to Post events from our
> ERP application. (Mine happens to be in IBM U2 (Unidata) and I have
> previously posted a message about the best way to communicate.  Unfortunatly
> there is no STOMP interface for UniBasic.  While Unidata has a CallC
> interface and it might be possible to utilize the C library for now we were
> just thinking of using the REST interface.

OK - though a UniBasic STOMP client would rock :)


> So, First up connecting to the REST interface.   So what is the correct URL
> for the rest interface?
> http://server:8161/ ?  When I look at the demo interface (of the 5.0
> SNAPSHOT) I see send the sendto post to
> http://server:8161/demo/message/FOO/BAR Is that the correct URL?

So its up to your web.xml to define the mapping; but yes in the demo
its demo/message/$DESTINATION

I've raised a JIRA to track the creation of standard URIs in the
out-of-the-box broker without using the Demo web app...
https://issues.apache.org/activemq/browse/AMQ-1334


> Next up.. The test.. If I'm using a single JMS server (for now) and I send a
> message via the REST interface.  Next I stop the ActiveMQ server.. When I
> restart the ActiveMQ Server I don't even see the Queues that were created..

Destinations are lazily loaded as they are used. You can specify
exactly what destinations to start with via...

http://activemq.apache.org/configure-startup-destinations.html

for more background see
http://activemq.apache.org/how-do-i-create-new-destinations.html


> Let alone the message that was in the queue. (Even if persistant delivery)
> is selected... So without setting up a CLUSTER of ActiveMQ servers.   How do
> I get the JMS server to maintain the state of the messages?  (i.e. Don't
> loose them)

You don't loose them; the destinations don't appear by default until
you produce/consume from them.


>
> Thanks in advance for your responses.. and forgive me for being a JMS
> newbie!

No worries and you're welcome! :)

-- 
James
-------
http://macstrac.blogspot.com/