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.Exchange; 024 import org.apache.camel.Processor; 025 import org.apache.camel.Producer; 026 import org.apache.camel.impl.DefaultConsumer; 027 import org.apache.camel.impl.DefaultEndpoint; 028 import org.apache.commons.logging.Log; 029 import org.apache.commons.logging.LogFactory; 030 031 /** 032 * Represents a direct endpoint that synchronously invokes the consumers of the 033 * endpoint when a producer sends a message to it. 034 * 035 * @version $Revision: 41278 $ 036 */ 037 public class DirectEndpoint<E extends Exchange> extends DefaultEndpoint<E> { 038 private static final Log LOG = LogFactory.getLog(DirectEndpoint.class); 039 boolean allowMultipleConsumers = true; 040 private final CopyOnWriteArrayList<DefaultConsumer<E>> consumers = new CopyOnWriteArrayList<DefaultConsumer<E>>(); 041 042 043 public DirectEndpoint(String uri, DirectComponent<E> component) { 044 super(uri, component); 045 } 046 047 public DirectEndpoint(String endpointUri) { 048 super(endpointUri); 049 } 050 051 public Producer createProducer() throws Exception { 052 return new DirectProducer<E>(this); 053 } 054 055 public Consumer<E> createConsumer(Processor processor) throws Exception { 056 return new DefaultConsumer<E>(this, processor) { 057 @Override 058 public void start() throws Exception { 059 if (!allowMultipleConsumers && !consumers.isEmpty()) { 060 throw new IllegalStateException("Endpoint " + getEndpointUri() + " only allows 1 active consumer but you attempted to start a 2nd consumer."); 061 } 062 063 consumers.add(this); 064 super.start(); 065 } 066 067 @Override 068 public void stop() throws Exception { 069 super.stop(); 070 consumers.remove(this); 071 } 072 }; 073 } 074 075 public boolean isAllowMultipleConsumers() { 076 return allowMultipleConsumers; 077 } 078 079 public void setAllowMultipleConsumers(boolean allowMutlipleConsumers) { 080 this.allowMultipleConsumers = allowMutlipleConsumers; 081 } 082 083 public boolean isSingleton() { 084 return true; 085 } 086 087 public List<DefaultConsumer<E>> getConsumers() { 088 return consumers; 089 } 090 }