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From astlm <monica.astudi...@tic.alten.es>
Subject Re: Priority message
Date Tue, 15 Jun 2010 13:12:21 GMT



I'll wait to camel 2.4.0 released or  active-mq version wich support
JMSPriority.

Thank you for your help. 




James.Strachan wrote:
> 
> On 15 June 2010 13:03, astlm <monica.astudillo@tic.alten.es> wrote:
>>
>> The first, thank you for the answer.
>>
>>
>> James.Strachan wrote:
>>>
>>> On 15 June 2010 07:54, astlm <monica.astudillo@tic.alten.es> wrote:
>>>>
>>>> I'm sorry but I did not understand how Resequencer work on, I have read
>>>> in
>>>> more detail how it works, and although not ideal, because only order a
>>>> number of messages or messages received over a period time, It can be a
>>>> solution.
>>>
>>> Thats how priority queues work too. How else can you know how long or
>>> how many messages to reorder?
>>>
>>> You are right.
>>> I was thought that every message recived to be placed in the correct
>>> position according to their priority, instead of waiting for a number of
>>> messages or to place, but I guess is that this is very hard and slow.
>>>
>>>> I think I have to define two queues, one for input and another oner for
>>>> output.
>>>
>>> Correct. It also lets you sort on much more fine grained things -
>>> including expressions which extract values from your message payload
>>> too if JMSPriority is not enough.
>>>
>>>
>>>> Is only necesary to define on broker.xml the Resequencer?
>>>>
>>>> <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
>>>>  <route>
>>>>    <from uri="input" />
>>>>    <resequence>
>>>>      <simple>body</simple>
>>>>      <to uri="output" />
>>>>      <batch-config batchSize="300" batchTimeout="4000"
>>>> allowDuplicates=true reverse=true />
>>>>    </resequence>
>>>>  </route>
>>>> </camelContext>
>>>>
>>>> With these configuration, The producer connect with input queue and the
>>>> consumer with output queue.
>>>
>>> You can put the above XML into any spring XML in any JVM really;
>>> though feel free to use it in the broker's XML file.
>>>
>>> I use activemq 5.3.2 with camel 2.2.0, according to specification,
>>> allowDuplicates and reverse are available from the camel 2.4.
>>> http://camel.apache.org/resequencer.html
>>> Any activemq version have camel 2.4?
> 
> Yes - you can use newer Camel releases with older ActiveMQ releases
> typically.
> 
>>> I tried download camel 2.4, but It´s not avalilable.
>>> http://camel.apache.org/download.html
> 
> 2.4 isn't released yet I'm afraid - 2.3 is the most recent release.
> You can use 2.4-SNAPSHOT for now if you like.
> 
> 
>>> I have a resequencer by JMSPriority, but It doesn`t get reverse orden
>>> and
>>> It doesn´t allow duplicates.
> 
> To reverse order you could use an expression like "100 -
> headers.JMSPriority" (it depends on which expression language you use
> with Camel - that would certainly work using bean expressions,
> javascript, XPath / XQuery, EL etc). Not 100% sure if simple language
> supports subtraction though.
> 
> To remove duplicates you could use idempotent consumer before the
> resequencer to filter out duplicates...
> http://camel.apache.org/idempotent-consumer.html
> 
> Though waiting for 2.4 might be easiest for you?
> 
> -- 
> James
> -------
> http://macstrac.blogspot.com/
> 
> Open Source Integration
> http://fusesource.com/
> 
> 

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