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.util;
018
019 import java.util.HashMap;
020 import java.util.Map;
021
022 import org.apache.camel.AsyncCallback;
023 import org.apache.camel.Endpoint;
024 import org.apache.camel.Exchange;
025 import org.apache.camel.ExchangePattern;
026 import org.apache.camel.FailedToCreateProducerException;
027 import org.apache.camel.Processor;
028 import org.apache.camel.Producer;
029 import org.apache.camel.RuntimeCamelException;
030 import org.apache.camel.impl.ServiceSupport;
031 import org.apache.camel.impl.converter.AsyncProcessorTypeConverter;
032 import org.apache.commons.logging.Log;
033 import org.apache.commons.logging.LogFactory;
034
035 /**
036 * @version $Revision: 36635 $
037 */
038 public class ProducerCache<E extends Exchange> extends ServiceSupport {
039 private static final Log LOG = LogFactory.getLog(ProducerCache.class);
040
041 private Map<String, Producer<E>> producers = new HashMap<String, Producer<E>>();
042
043 public synchronized Producer<E> getProducer(Endpoint<E> endpoint) {
044 String key = endpoint.getEndpointUri();
045 Producer<E> answer = producers.get(key);
046 if (answer == null) {
047 try {
048 answer = endpoint.createProducer();
049 answer.start();
050 } catch (Exception e) {
051 throw new FailedToCreateProducerException(endpoint, e);
052 }
053 producers.put(key, answer);
054 }
055 return answer;
056 }
057
058 /**
059 * Sends the exchange to the given endpoint
060 *
061 * @param endpoint the endpoint to send the exchange to
062 * @param exchange the exchange to send
063 */
064 public void send(Endpoint<E> endpoint, E exchange) {
065 try {
066 Producer<E> producer = getProducer(endpoint);
067 producer.process(exchange);
068 } catch (Exception e) {
069 throw new RuntimeCamelException(e);
070 }
071 }
072
073 /**
074 * Sends an exchange to an endpoint using a supplied
075 * {@link Processor} to populate the exchange
076 *
077 * @param endpoint the endpoint to send the exchange to
078 * @param processor the transformer used to populate the new exchange
079 */
080 public E send(Endpoint<E> endpoint, Processor processor) {
081 try {
082 Producer<E> producer = getProducer(endpoint);
083 E exchange = producer.createExchange();
084 return sendExchange(endpoint, producer, processor, exchange);
085 } catch (Exception e) {
086 throw new RuntimeCamelException(e);
087 }
088 }
089
090 /**
091 * Sends an exchange to an endpoint using a supplied
092 * {@link Processor} to populate the exchange. The callback
093 * will be called when the exchange is completed.
094 *
095 * @param endpoint the endpoint to send the exchange to
096 * @param processor the transformer used to populate the new exchange
097 */
098 public E send(Endpoint<E> endpoint, Processor processor, AsyncCallback callback) {
099 try {
100 Producer<E> producer = getProducer(endpoint);
101 E exchange = producer.createExchange();
102 boolean sync = sendExchange(endpoint, producer, processor, exchange, callback);
103 setProcessedSync(exchange, sync);
104 return exchange;
105 } catch (Exception e) {
106 throw new RuntimeCamelException(e);
107 }
108 }
109
110 public static boolean isProcessedSync(Exchange exchange) {
111 Boolean rc = exchange.getProperty(ProducerCache.class.getName() + ".SYNC", Boolean.class);
112 return rc == null ? false : rc;
113 }
114
115 public static void setProcessedSync(Exchange exchange, boolean b) {
116 exchange.setProperty(ProducerCache.class.getName() + ".SYNC", b ? Boolean.TRUE : Boolean.FALSE);
117 }
118
119 /**
120 * Sends an exchange to an endpoint using a supplied
121 * {@link Processor} to populate the exchange
122 *
123 * @param endpoint the endpoint to send the exchange to
124 * @param pattern the message {@link ExchangePattern} such as
125 * {@link ExchangePattern#InOnly} or {@link ExchangePattern#InOut}
126 * @param processor the transformer used to populate the new exchange
127 */
128 public E send(Endpoint<E> endpoint, ExchangePattern pattern, Processor processor) {
129 try {
130 Producer<E> producer = getProducer(endpoint);
131 E exchange = producer.createExchange(pattern);
132 return sendExchange(endpoint, producer, processor, exchange);
133 } catch (Exception e) {
134 throw new RuntimeCamelException(e);
135 }
136 }
137
138
139 protected E sendExchange(Endpoint<E> endpoint, Producer<E> producer, Processor processor, E exchange) throws Exception {
140 // lets populate using the processor callback
141 processor.process(exchange);
142
143 // now lets dispatch
144 if (LOG.isDebugEnabled()) {
145 LOG.debug(">>>> " + endpoint + " " + exchange);
146 }
147 producer.process(exchange);
148 return exchange;
149 }
150
151 protected boolean sendExchange(Endpoint<E> endpoint, Producer<E> producer, Processor processor, E exchange, AsyncCallback callback) throws Exception {
152 // lets populate using the processor callback
153 processor.process(exchange);
154
155 // now lets dispatch
156 if (LOG.isDebugEnabled()) {
157 LOG.debug(">>>> " + endpoint + " " + exchange);
158 }
159 return AsyncProcessorTypeConverter.convert(producer).process(exchange, callback);
160 }
161
162 protected void doStop() throws Exception {
163 ServiceHelper.stopServices(producers.values());
164 }
165
166 protected void doStart() throws Exception {
167 }
168 }