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From "Claus Ibsen (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CAMEL-3188) Concurrent consumers on seda endpoint can cause content routing to mismatch
Date Sat, 02 Oct 2010 15:17:41 GMT

     [ https://issues.apache.org/activemq/browse/CAMEL-3188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Claus Ibsen resolved CAMEL-3188.
--------------------------------

    Fix Version/s: 2.5.0
       Resolution: Fixed

trunk: 1003810.

> Concurrent consumers on seda endpoint can cause content routing to mismatch
> ---------------------------------------------------------------------------
>
>                 Key: CAMEL-3188
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-3188
>             Project: Apache Camel
>          Issue Type: Bug
>          Components: camel-core
>    Affects Versions: 2.3.0, 2.4.0
>         Environment: Mac OS X 10.6.4
> Java(TM) SE Runtime Environment (build 1.6.0_20-b02-279-10M3065)
>            Reporter: Brian Feaver
>            Assignee: Claus Ibsen
>             Fix For: 2.5.0
>
>
> When consuming concurrently from a seda endpoint, when the route contains a content router
based on the header, it will randomly route through the wrong choice.
> In my specific case, I was consuming from an activemq queue, which would receive messages
with a header that would then determine which route it would follow. It would randomly send
messages down the wrong path. When I turned on tracing, it would behave itself. It also behaved
itself when I limited it to only a single consumer. I was, however, able to duplicate it with
the unit test below. Due to the concurrency issue, the test can occasionally pass, but run
it a couple times and it should fail. It'll either receive 2 messages when it should have
only gotten 1, or it will get no messages when it should have gotten 1.
> {code:title=ConcurrencyTest.java|borderStyle=solid}
> import org.apache.camel.EndpointInject;
> import org.apache.camel.Produce;
> import org.apache.camel.ProducerTemplate;
> import org.apache.camel.builder.RouteBuilder;
> import org.apache.camel.component.mock.MockEndpoint;
> import org.apache.camel.test.CamelTestSupport;
> public class ConcurrencyTest extends CamelTestSupport {
> 	@EndpointInject(uri = "mock:result")
> 	protected MockEndpoint resultEndpoint;
> 	
> 	@EndpointInject(uri = "mock:otherResult")
> 	protected MockEndpoint otherResultEndpoint;
> 	@Produce(uri = "seda:start")
> 	protected ProducerTemplate template;
> 	public void testSendMatchingMessage() throws Exception {
> 		String expectedBody = "<matched/>";
> 		
> 		resultEndpoint.expectedBodiesReceived(expectedBody);
> 		otherResultEndpoint.expectedBodiesReceived(expectedBody);
> 		template.sendBodyAndHeader(expectedBody, "myDirection", "send");
> 		template.sendBodyAndHeader(expectedBody, "myDirection", "received");
> 		resultEndpoint.assertIsSatisfied();
> 	}
> 	@Override
>     protected RouteBuilder createRouteBuilder() {
>         return new RouteBuilder() {
>             public void configure() {
>                 from("seda:start?concurrentConsumers=10")
> //                from("seda:start?concurrentConsumers=1")
>                 	.choice()
>                 		.when(header("myDirection").isEqualTo("send")).to("mock:result")
>                 		.when(header("myDirection").isEqualTo("received")).to("mock:otherResult");
>             }
>         };
>     }
> }
> {code}

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