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Date: Thu, 9 Mar 2017 07:26:37 +0000 (UTC)
From: "Dan Rivett (JIRA)" <jira@apache.org>
To: issues@camel.apache.org
Message-ID: <JIRA.13049507.1489040027000.19807.1489044397962@Atlassian.JIRA>
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Subject: [jira] [Commented] (CAMEL-10972) ProducerCache uses
 Endpoint.getEndpointUri() as key which isn't always unique!
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archived-at: Thu, 09 Mar 2017 07:26:46 -0000


    [ https://issues.apache.org/jira/browse/CAMEL-10972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902608#comment-15902608 ] 

Dan Rivett commented on CAMEL-10972:
------------------------------------

Yes I just saw that between 2.17.5 and 2.18.0 the camel-context pom.xml was updated to include '(deprecated)' in the name so I guess it was deprecated in 2.18 but I didn't see it in the 2.18 [release notes|http://camel.apache.org/camel-2180-release.html] or on the component page linked above.

I would recommend and appreciate an update the component page above to indicate its deprecation and what the recommended alternative is ({{vm}} or {{direct-vm}}?)

> ProducerCache uses Endpoint.getEndpointUri() as key which isn't always unique!
> ------------------------------------------------------------------------------
>
>                 Key: CAMEL-10972
>                 URL: https://issues.apache.org/jira/browse/CAMEL-10972
>             Project: Camel
>          Issue Type: Bug
>    Affects Versions: 2.16.1
>            Reporter: Dan Rivett
>            Assignee: Claus Ibsen
>
> Found in 2.16.1 (I can't upgrade yet due to it being run in a legacy Spring 3.2 environment) but it looks to still be present in the current codebase from viewing the master branch.
> h3. Background
> When referencing direct endpoints from a different context using the uri {{context:endpointUri}} such as the following:
> {code}
> <route id="deadLetterRouteWithMulticast">
> 	<from uri="direct:foo"/>
> 	<multicast>
> 		<to uri="context-a:notifyProcessingFailedRoute" />
> 		<to uri="context-b:notifyProcessingFailedRoute" />
> 	</multicast>
> </route>
> {code}
> This works fine.
> However swap to a {{RecipientList}} and it fails:
> {code}
> <route id="deadLetterRouteWithRecipientList">
> 	<from uri="direct:foo"/>
> 	<setHeader headerName="myRecipientListHeader">
> 		<constant>context-a:notifyProcessingFailedRoute,context-b:notifyProcessingFailedRoute</constant>
> 	</setHeader>
> 	<recipientList delimiter=",">
> 		<header>myRecipientListHeader</header>
> 	</recipientList>
> </route>
> {code}
> h3. Investigation
> This appears to be due to {{ProducerCache}} caching by {{Endpoint.getEndpointUri()}} which in the case of a {{DirectEndpoint}} both the recipients in the list return the same ({{direct://notifyProcessingFailedRoute}} value in the example above). {{ProducerCache}} is called by {{RecipientListProcessor}} [here|https://github.com/apache/camel/blob/master/camel-core/src/main/java/org/apache/camel/processor/RecipientListProcessor.java#L202]. Note: the {{endpoint}} variable two lines above resolves to the correct {{Endpoint}} it is the {{Producer}} which is resolved (via cache) incorrectly.
> Now I don't know the Camel codebase well enough to say if {{DirectEndpoint.getEndpointUri()}} should return ambiguous URIs in multi-Camel-Context environments, or whether {{ProducerCache.doGetProducer()}} (see [here|https://github.com/apache/camel/blob/master/camel-core/src/main/java/org/apache/camel/impl/ProducerCache.java#L564]) should use a key like something as follows to use a cache key that takes into account the {{Endpoint}}'s Camel Context:
> {code}
> String key = endpoint.getCamelContext().getName() + "_" + endpoint.getEndpointUri();
> {code}
> This seems over-simplistic because endpoints that aren't Camel Context specific such as JMS could be in the cache multiple times, but at least the correct {{Endpoint}} would be returned from the cache each time, unlike now.
> h3. Workarounds
> 1. Use different endpoint uris (e.g. prepend context name).
> 2. Supply the Recipient List with Endpoints rather than Strings to avoid parsing the URIs into Endpoints and running into this issue (see [this line|https://github.com/apache/camel/blob/master/camel-core/src/main/java/org/apache/camel/util/ExchangeHelper.java#L87]). Seems a bit of a hack.


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