/**
* 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.seda;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import org.apache.camel.Component;
import org.apache.camel.Consumer;
import org.apache.camel.Exchange;
import org.apache.camel.MultipleConsumersSupport;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.WaitForTaskToComplete;
import org.apache.camel.impl.DefaultEndpoint;
import org.apache.camel.processor.MulticastProcessor;
import org.apache.camel.spi.BrowsableEndpoint;
import org.apache.camel.util.ServiceHelper;
/**
* An implementation of the <a
* href="http://camel.apache.org/queue.html">Queue components</a> for
* asynchronous SEDA exchanges on a {@link BlockingQueue} within a CamelContext
*
* @version $Revision: 1057202 $
*/
public class SedaEndpoint extends DefaultEndpoint implements BrowsableEndpoint, MultipleConsumersSupport {
private volatile BlockingQueue<Exchange> queue;
private int size;
private int concurrentConsumers = 1;
private volatile ExecutorService multicastExecutor;
private boolean multipleConsumers;
private WaitForTaskToComplete waitForTaskToComplete = WaitForTaskToComplete.IfReplyExpected;
private long timeout = 30000;
private volatile Set<SedaProducer> producers = new CopyOnWriteArraySet<SedaProducer>();
private volatile Set<SedaConsumer> consumers = new CopyOnWriteArraySet<SedaConsumer>();
private volatile MulticastProcessor consumerMulticastProcessor;
private volatile boolean multicastStarted;
public SedaEndpoint() {
}
public SedaEndpoint(String endpointUri, Component component, BlockingQueue<Exchange> queue) {
this(endpointUri, component, queue, 1);
}
public SedaEndpoint(String endpointUri, Component component, BlockingQueue<Exchange> queue, int concurrentConsumers) {
super(endpointUri, component);
this.queue = queue;
this.size = queue.remainingCapacity();
this.concurrentConsumers = concurrentConsumers;
}
public SedaEndpoint(String endpointUri, BlockingQueue<Exchange> queue) {
this(endpointUri, queue, 1);
}
public SedaEndpoint(String endpointUri, BlockingQueue<Exchange> queue, int concurrentConsumers) {
super(endpointUri);
this.queue = queue;
this.size = queue.remainingCapacity();
this.concurrentConsumers = concurrentConsumers;
}
public Producer createProducer() throws Exception {
return new SedaProducer(this, getQueue(), getWaitForTaskToComplete(), getTimeout());
}
public Consumer createConsumer(Processor processor) throws Exception {
return new SedaConsumer(this, processor);
}
public synchronized BlockingQueue<Exchange> getQueue() {
if (queue == null) {
if (size > 0) {
queue = new LinkedBlockingQueue<Exchange>(size);
} else {
queue = new LinkedBlockingQueue<Exchange>();
}
}
return queue;
}
protected synchronized MulticastProcessor getConsumerMulticastProcessor() throws Exception {
if (!multicastStarted && consumerMulticastProcessor != null) {
// only start it on-demand to avoid starting it during stopping
ServiceHelper.startService(consumerMulticastProcessor);
multicastStarted = true;
}
return consumerMulticastProcessor;
}
protected synchronized void updateMulticastProcessor() throws Exception {
if (consumerMulticastProcessor != null) {
ServiceHelper.stopService(consumerMulticastProcessor);
}
int size = getConsumers().size();
if (size == 0 && multicastExecutor != null) {
// stop the multicast executor as its not needed anymore when size is zero
getCamelContext().getExecutorServiceStrategy().shutdown(multicastExecutor);
multicastExecutor = null;
}
if (size > 1) {
if (multicastExecutor == null) {
// create multicast executor as we need it when we have more than 1 processor
multicastExecutor = getCamelContext().getExecutorServiceStrategy().newDefaultThreadPool(this, getEndpointUri() + "(multicast)");
}
// create list of consumers to multicast to
List<Processor> processors = new ArrayList<Processor>(size);
for (SedaConsumer consumer : getConsumers()) {
processors.add(consumer.getProcessor());
}
// create multicast processor
multicastStarted = false;
consumerMulticastProcessor = new MulticastProcessor(getCamelContext(), processors, null, true, multicastExecutor, false, false, 0);
} else {
// not needed
consumerMulticastProcessor = null;
}
}
public void setQueue(BlockingQueue<Exchange> queue) {
this.queue = queue;
this.size = queue.remainingCapacity();
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
public void setConcurrentConsumers(int concurrentConsumers) {
this.concurrentConsumers = concurrentConsumers;
}
public int getConcurrentConsumers() {
return concurrentConsumers;
}
public WaitForTaskToComplete getWaitForTaskToComplete() {
return waitForTaskToComplete;
}
public void setWaitForTaskToComplete(WaitForTaskToComplete waitForTaskToComplete) {
this.waitForTaskToComplete = waitForTaskToComplete;
}
public long getTimeout() {
return timeout;
}
public void setTimeout(long timeout) {
this.timeout = timeout;
}
public boolean isMultipleConsumers() {
return multipleConsumers;
}
public void setMultipleConsumers(boolean multipleConsumers) {
this.multipleConsumers = multipleConsumers;
}
public boolean isSingleton() {
return true;
}
/**
* Returns the current pending exchanges
*/
public List<Exchange> getExchanges() {
return new ArrayList<Exchange>(getQueue());
}
public boolean isMultipleConsumersSupported() {
return isMultipleConsumers();
}
/**
* Returns the current active consumers on this endpoint
*/
public Set<SedaConsumer> getConsumers() {
return new HashSet<SedaConsumer>(consumers);
}
/**
* Returns the current active producers on this endpoint
*/
public Set<SedaProducer> getProducers() {
return new HashSet<SedaProducer>(producers);
}
void onStarted(SedaProducer producer) {
producers.add(producer);
}
void onStopped(SedaProducer producer) {
producers.remove(producer);
}
void onStarted(SedaConsumer consumer) throws Exception {
consumers.add(consumer);
if (isMultipleConsumers()) {
updateMulticastProcessor();
}
}
void onStopped(SedaConsumer consumer) throws Exception {
consumers.remove(consumer);
if (isMultipleConsumers()) {
updateMulticastProcessor();
}
}
}