001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.component.direct;
018
019 import java.util.List;
020 import java.util.concurrent.CopyOnWriteArrayList;
021
022 import org.apache.camel.Consumer;
023 import org.apache.camel.Processor;
024 import org.apache.camel.Producer;
025 import org.apache.camel.impl.DefaultConsumer;
026 import org.apache.camel.impl.DefaultEndpoint;
027
028 /**
029 * Represents a direct endpoint that synchronously invokes the consumers of the
030 * endpoint when a producer sends a message to it.
031 *
032 * @version $Revision: 751221 $
033 */
034 public class DirectEndpoint extends DefaultEndpoint {
035 private boolean allowMultipleConsumers = true;
036 private final CopyOnWriteArrayList<DefaultConsumer> consumers = new CopyOnWriteArrayList<DefaultConsumer>();
037
038 public DirectEndpoint() {
039 }
040
041 public DirectEndpoint(String uri, DirectComponent component) {
042 super(uri, component);
043 }
044
045 public DirectEndpoint(String endpointUri) {
046 super(endpointUri);
047 }
048
049 public Producer createProducer() throws Exception {
050 return new DirectProducer(this);
051 }
052
053 public Consumer createConsumer(Processor processor) throws Exception {
054 return new DefaultConsumer(this, processor) {
055 @Override
056 public void start() throws Exception {
057 if (!allowMultipleConsumers && !consumers.isEmpty()) {
058 throw new IllegalStateException("Endpoint " + getEndpointUri() + " only allows 1 active consumer but you attempted to start a 2nd consumer.");
059 }
060
061 consumers.add(this);
062 super.start();
063 }
064
065 @Override
066 public void stop() throws Exception {
067 super.stop();
068 consumers.remove(this);
069 }
070 };
071 }
072
073 public boolean isAllowMultipleConsumers() {
074 return allowMultipleConsumers;
075 }
076
077 public void setAllowMultipleConsumers(boolean allowMutlipleConsumers) {
078 this.allowMultipleConsumers = allowMutlipleConsumers;
079 }
080
081 public boolean isSingleton() {
082 return true;
083 }
084
085 public List<DefaultConsumer> getConsumers() {
086 return consumers;
087 }
088 }