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 */ 017package org.apache.camel.component.directvm; 018 019import java.util.ArrayList; 020import java.util.Collection; 021import java.util.Map; 022import java.util.concurrent.ConcurrentHashMap; 023import java.util.concurrent.ConcurrentMap; 024import java.util.concurrent.atomic.AtomicInteger; 025 026import org.apache.camel.Endpoint; 027import org.apache.camel.impl.UriEndpointComponent; 028import org.apache.camel.spi.HeaderFilterStrategy; 029import org.apache.camel.spi.Metadata; 030 031/** 032 * The <a href="http://camel.apache.org/direct-vm.html">Direct VM Component</a> manages {@link DirectVmEndpoint} and holds the list of named direct-vm endpoints. 033 */ 034public class DirectVmComponent extends UriEndpointComponent { 035 036 private static final AtomicInteger START_COUNTER = new AtomicInteger(); 037 038 // must keep a map of consumers on the component to ensure endpoints can lookup old consumers 039 // later in case the DirectVmEndpoint was re-created due the old was evicted from the endpoints LRUCache 040 // on DefaultCamelContext 041 private static final ConcurrentMap<String, DirectVmConsumer> CONSUMERS = new ConcurrentHashMap<String, DirectVmConsumer>(); 042 private boolean block; 043 @Metadata(defaultValue = "30000") 044 private long timeout = 30000L; 045 private HeaderFilterStrategy headerFilterStrategy; 046 @Metadata(defaultValue = "true") 047 private Boolean propagateProperties = Boolean.TRUE; 048 049 public DirectVmComponent() { 050 super(DirectVmEndpoint.class); 051 } 052 053 /** 054 * Gets all the consumer endpoints. 055 * 056 * @return consumer endpoints 057 */ 058 public static Collection<Endpoint> getConsumerEndpoints() { 059 Collection<Endpoint> endpoints = new ArrayList<Endpoint>(CONSUMERS.size()); 060 for (DirectVmConsumer consumer : CONSUMERS.values()) { 061 endpoints.add(consumer.getEndpoint()); 062 } 063 return endpoints; 064 } 065 066 @Override 067 protected Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception { 068 DirectVmEndpoint answer = new DirectVmEndpoint(uri, this); 069 answer.setBlock(block); 070 answer.setTimeout(timeout); 071 answer.configureProperties(parameters); 072 setProperties(answer, parameters); 073 return answer; 074 } 075 076 public DirectVmConsumer getConsumer(DirectVmEndpoint endpoint) { 077 String key = getConsumerKey(endpoint.getEndpointUri()); 078 return CONSUMERS.get(key); 079 } 080 081 public void addConsumer(DirectVmEndpoint endpoint, DirectVmConsumer consumer) { 082 String key = getConsumerKey(endpoint.getEndpointUri()); 083 DirectVmConsumer existing = CONSUMERS.putIfAbsent(key, consumer); 084 if (existing != null) { 085 String contextId = existing.getEndpoint().getCamelContext().getName(); 086 throw new IllegalStateException("A consumer " + existing + " already exists from CamelContext: " + contextId + ". Multiple consumers not supported"); 087 } 088 } 089 090 public void removeConsumer(DirectVmEndpoint endpoint, DirectVmConsumer consumer) { 091 String key = getConsumerKey(endpoint.getEndpointUri()); 092 CONSUMERS.remove(key); 093 } 094 095 private static String getConsumerKey(String uri) { 096 if (uri.contains("?")) { 097 // strip parameters 098 uri = uri.substring(0, uri.indexOf('?')); 099 } 100 return uri; 101 } 102 103 @Override 104 protected void doStart() throws Exception { 105 super.doStart(); 106 START_COUNTER.incrementAndGet(); 107 } 108 109 @Override 110 protected void doStop() throws Exception { 111 if (START_COUNTER.decrementAndGet() <= 0) { 112 // clear queues when no more direct-vm components in use 113 CONSUMERS.clear(); 114 } 115 super.doStop(); 116 } 117 118 public boolean isBlock() { 119 return block; 120 } 121 122 /** 123 * If sending a message to a direct endpoint which has no active consumer, 124 * then we can tell the producer to block and wait for the consumer to become active. 125 */ 126 public void setBlock(boolean block) { 127 this.block = block; 128 } 129 130 public long getTimeout() { 131 return timeout; 132 } 133 134 /** 135 * The timeout value to use if block is enabled. 136 */ 137 public void setTimeout(long timeout) { 138 this.timeout = timeout; 139 } 140 141 public HeaderFilterStrategy getHeaderFilterStrategy() { 142 return headerFilterStrategy; 143 } 144 145 /** 146 * Sets a {@link HeaderFilterStrategy} that will only be applied on producer endpoints (on both directions: request and response). 147 * <p>Default value: none.</p> 148 * @param headerFilterStrategy 149 */ 150 public void setHeaderFilterStrategy(HeaderFilterStrategy headerFilterStrategy) { 151 this.headerFilterStrategy = headerFilterStrategy; 152 } 153 154 public boolean isPropagateProperties() { 155 return propagateProperties; 156 } 157 158 /** 159 * Whether to propagate or not properties from the producer side to the consumer side, and viceversa. 160 * <p>Default value: true.</p> 161 * @param propagateProperties 162 */ 163 public void setPropagateProperties(boolean propagateProperties) { 164 this.propagateProperties = propagateProperties; 165 } 166 167}