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From "Claus Ibsen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CAMEL-3031) Auto assigned CamelContext id should be unique in the JVM
Date Sat, 07 Aug 2010 07:05:47 GMT

    [ https://issues.apache.org/activemq/browse/CAMEL-3031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=61094#action_61094
] 

Claus Ibsen commented on CAMEL-3031:
------------------------------------

When you define a <camelContext/> in a XML file, you have 2 choices
a) the id can be explicit given
b) no id given

In the former case Camel will use this id as the bean id in Spring ApplicationContext and
as well for JMX.
In the latter Camel will auto assign an unique id to be used in Spring ApplicationContext
and as well for JMX.

There are 2 problems with the current code

1)
When registering a CamelContext in JMX, Camel would ignore if an existing CamelContext with
the same id was already registered. This means that you would end up with 2 different CamelContext's
merged into the same. This means you cannot manage the 2nd CamelContext, for example to stop
it etc as it would not be enlisted. Also when the 1st is unregistered, you would leave mbeans
_hanging_ in there for the 2nd which doensn't have a CamelContext etc.  Also there are problems
with clashes of endpoint uris, error handlers, tracers etc.

Bottom line we end up with mixed data. 

2)
In OSGi the auto assigned unique name is *not* unique because OSGi causes the atomic counter
to be multiple instances so you end up with Camel ids' all being {{camel-1}}. This works in
non OSGi environments such as WARs etc.


All these problems can of course be resolved by explicit assigning an unique id for you <camelContext>'s.


We will also try to enhance the auto assigned unique name in OSGi to include bundle id etc.
so it brings more value for you. So if you bundle has given id 147, then the auto assigned
id should be {{camel-147}} etc.



> Auto assigned CamelContext id should be unique in the JVM
> ---------------------------------------------------------
>
>                 Key: CAMEL-3031
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-3031
>             Project: Apache Camel
>          Issue Type: Bug
>          Components: camel-core
>            Reporter: Claus Ibsen
>            Assignee: Claus Ibsen
>             Fix For: 2.5.0
>
>
> See nabble
> http://camel.465427.n5.nabble.com/multiple-camel-contexts-as-viewed-from-JMX-tp2265902p2265902.html
> Route ids are being unique, so we should be able to do that for CamelContext id as well.
And we should reject starting an application if an existing CamelContext exists with the same
id. This applies to JMX.

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