Concurrent consumers on seda endpoint can cause content routing to mismatch
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Key: CAMEL-3188
URL: https://issues.apache.org/activemq/browse/CAMEL-3188
Project: Apache Camel
Issue Type: Bug
Components: camel-core
Affects Versions: 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
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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