/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.component.jms;
import org.apache.camel.util.concurrent.CamelThreadFactory;
import org.springframework.core.task.SimpleAsyncTaskExecutor;
import org.springframework.core.task.TaskExecutor;
import org.springframework.jms.listener.DefaultMessageListenerContainer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
/**
* The default {@link DefaultMessageListenerContainer container} which listen for messages
* on the JMS destination.
* <p/>
* This implementation extends Springs {@link DefaultMessageListenerContainer} supporting
* automatic recovery and throttling.
*
* @version
*/
public class DefaultJmsMessageListenerContainer extends DefaultMessageListenerContainer {
private final JmsEndpoint endpoint;
public DefaultJmsMessageListenerContainer(JmsEndpoint endpoint) {
this.endpoint = endpoint;
}
@Override
protected boolean runningAllowed() {
// do not run if we have been stopped
return endpoint.isRunning();
}
/**
* Create a default TaskExecutor. Called if no explicit TaskExecutor has been specified.
* <p />
* The type of {@link TaskExecutor} will depend on the value of
* {@link JmsConfiguration#getDefaultTaskExecutorType()}. For more details, refer to the Javadoc of
* {@link DefaultTaskExecutorType}.
* <p />
* In all cases, it uses the specified bean name and Camel's {@link org.apache.camel.spi.ExecutorServiceManager}
* to resolve the thread name.
* @see JmsConfiguration#setDefaultTaskExecutorType(DefaultTaskExecutorType)
* @see ThreadPoolTaskExecutor#setBeanName(String)
*/
@Override
protected TaskExecutor createDefaultTaskExecutor() {
String pattern = endpoint.getCamelContext().getExecutorServiceManager().getThreadNamePattern();
String beanName = getBeanName() == null ? endpoint.getThreadName() : getBeanName();
if (endpoint.getDefaultTaskExecutorType() == DefaultTaskExecutorType.ThreadPool) {
ThreadPoolTaskExecutor answer = new ThreadPoolTaskExecutor();
answer.setBeanName(beanName);
answer.setThreadFactory(new CamelThreadFactory(pattern, beanName, true));
answer.setCorePoolSize(endpoint.getConcurrentConsumers());
// Direct hand-off mode. Do not queue up tasks: assign it to a thread immediately.
// We set no upper-bound on the thread pool (no maxPoolSize) as it's already implicitly constrained by
// maxConcurrentConsumers on the DMLC itself (i.e. DMLC will only grow up to a level of concurrency as
// defined by maxConcurrentConsumers).
answer.setQueueCapacity(0);
answer.initialize();
return answer;
} else {
SimpleAsyncTaskExecutor answer = new SimpleAsyncTaskExecutor(beanName);
answer.setThreadFactory(new CamelThreadFactory(pattern, beanName, true));
return answer;
}
}
}