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.Metadata; 029 030/** 031 * 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. 032 */ 033public class DirectVmComponent extends UriEndpointComponent { 034 035 private static final AtomicInteger START_COUNTER = new AtomicInteger(); 036 037 // must keep a map of consumers on the component to ensure endpoints can lookup old consumers 038 // later in case the DirectVmEndpoint was re-created due the old was evicted from the endpoints LRUCache 039 // on DefaultCamelContext 040 private static final ConcurrentMap<String, DirectVmConsumer> CONSUMERS = new ConcurrentHashMap<String, DirectVmConsumer>(); 041 private boolean block; 042 @Metadata(defaultValue = "30000") 043 private long timeout = 30000L; 044 045 public DirectVmComponent() { 046 super(DirectVmEndpoint.class); 047 } 048 049 /** 050 * Gets all the consumer endpoints. 051 * 052 * @return consumer endpoints 053 */ 054 public static Collection<Endpoint> getConsumerEndpoints() { 055 Collection<Endpoint> endpoints = new ArrayList<Endpoint>(CONSUMERS.size()); 056 for (DirectVmConsumer consumer : CONSUMERS.values()) { 057 endpoints.add(consumer.getEndpoint()); 058 } 059 return endpoints; 060 } 061 062 @Override 063 protected Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception { 064 DirectVmEndpoint answer = new DirectVmEndpoint(uri, this); 065 answer.setBlock(block); 066 answer.setTimeout(timeout); 067 answer.configureProperties(parameters); 068 return answer; 069 } 070 071 public DirectVmConsumer getConsumer(DirectVmEndpoint endpoint) { 072 String key = getConsumerKey(endpoint.getEndpointUri()); 073 return CONSUMERS.get(key); 074 } 075 076 public void addConsumer(DirectVmEndpoint endpoint, DirectVmConsumer consumer) { 077 String key = getConsumerKey(endpoint.getEndpointUri()); 078 DirectVmConsumer existing = CONSUMERS.putIfAbsent(key, consumer); 079 if (existing != null) { 080 String contextId = existing.getEndpoint().getCamelContext().getName(); 081 throw new IllegalStateException("A consumer " + existing + " already exists from CamelContext: " + contextId + ". Multiple consumers not supported"); 082 } 083 } 084 085 public void removeConsumer(DirectVmEndpoint endpoint, DirectVmConsumer consumer) { 086 String key = getConsumerKey(endpoint.getEndpointUri()); 087 CONSUMERS.remove(key); 088 } 089 090 private static String getConsumerKey(String uri) { 091 if (uri.contains("?")) { 092 // strip parameters 093 uri = uri.substring(0, uri.indexOf('?')); 094 } 095 return uri; 096 } 097 098 @Override 099 protected void doStart() throws Exception { 100 super.doStart(); 101 START_COUNTER.incrementAndGet(); 102 } 103 104 @Override 105 protected void doStop() throws Exception { 106 if (START_COUNTER.decrementAndGet() <= 0) { 107 // clear queues when no more direct-vm components in use 108 CONSUMERS.clear(); 109 } 110 super.doStop(); 111 } 112 113 public boolean isBlock() { 114 return block; 115 } 116 117 /** 118 * If sending a message to a direct endpoint which has no active consumer, 119 * then we can tell the producer to block and wait for the consumer to become active. 120 */ 121 public void setBlock(boolean block) { 122 this.block = block; 123 } 124 125 public long getTimeout() { 126 return timeout; 127 } 128 129 /** 130 * The timeout value to use if block is enabled. 131 */ 132 public void setTimeout(long timeout) { 133 this.timeout = timeout; 134 } 135}