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.directvm; 018 019 import java.util.Map; 020 import java.util.concurrent.ConcurrentHashMap; 021 import java.util.concurrent.ConcurrentMap; 022 import java.util.concurrent.atomic.AtomicInteger; 023 024 import org.apache.camel.Endpoint; 025 import org.apache.camel.impl.DefaultComponent; 026 027 /** 028 * Represents the component that manages {@link DirectVmEndpoint}. It holds the 029 * list of named direct-vm endpoints. 030 */ 031 public class DirectVmComponent extends DefaultComponent { 032 033 private static final AtomicInteger START_COUNTER = new AtomicInteger(); 034 035 // must keep a map of consumers on the component to ensure endpoints can lookup old consumers 036 // later in case the DirectVmEndpoint was re-created due the old was evicted from the endpoints LRUCache 037 // on DefaultCamelContext 038 private static final ConcurrentMap<String, DirectVmConsumer> CONSUMERS = new ConcurrentHashMap<String, DirectVmConsumer>(); 039 040 @Override 041 protected Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception { 042 DirectVmEndpoint answer = new DirectVmEndpoint(uri, this); 043 answer.configureProperties(parameters); 044 return answer; 045 } 046 047 public DirectVmConsumer getConsumer(DirectVmEndpoint endpoint) { 048 String key = getConsumerKey(endpoint.getEndpointUri()); 049 return CONSUMERS.get(key); 050 } 051 052 public void addConsumer(DirectVmEndpoint endpoint, DirectVmConsumer consumer) { 053 String key = getConsumerKey(endpoint.getEndpointUri()); 054 DirectVmConsumer existing = CONSUMERS.putIfAbsent(key, consumer); 055 if (existing != null) { 056 String contextId = existing.getEndpoint().getCamelContext().getName(); 057 throw new IllegalStateException("A consumer " + existing + " already exists from CamelContext: " + contextId + ". Multiple consumers not supported"); 058 } 059 } 060 061 public void removeConsumer(DirectVmEndpoint endpoint, DirectVmConsumer consumer) { 062 String key = getConsumerKey(endpoint.getEndpointUri()); 063 CONSUMERS.remove(key); 064 } 065 066 private static String getConsumerKey(String uri) { 067 if (uri.contains("?")) { 068 // strip parameters 069 uri = uri.substring(0, uri.indexOf('?')); 070 } 071 return uri; 072 } 073 074 @Override 075 protected void doStart() throws Exception { 076 super.doStart(); 077 START_COUNTER.incrementAndGet(); 078 } 079 080 @Override 081 protected void doStop() throws Exception { 082 if (START_COUNTER.decrementAndGet() <= 0) { 083 // clear queues when no more direct-vm components in use 084 CONSUMERS.clear(); 085 } 086 super.doStop(); 087 } 088 089 }