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.impl;
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.converter.AsyncProcessorTypeConverter;
031    import org.apache.camel.util.ServiceHelper;
032    import org.apache.commons.logging.Log;
033    import org.apache.commons.logging.LogFactory;
034    
035    /**
036     * Cache containing created {@link Producer}.
037     *
038     * @version $Revision: 41910 $
039     */
040    public class ProducerCache<E extends Exchange> extends ServiceSupport {
041        private static final transient Log LOG = LogFactory.getLog(ProducerCache.class);
042    
043        private Map<String, Producer<E>> producers = new HashMap<String, Producer<E>>();
044    
045        public synchronized Producer<E> getProducer(Endpoint<E> endpoint) {
046            String key = endpoint.getEndpointUri();
047            Producer<E> answer = producers.get(key);
048            if (answer == null) {
049                try {
050                    answer = endpoint.createProducer();
051                    answer.start();
052                } catch (Exception e) {
053                    throw new FailedToCreateProducerException(endpoint, e);
054                }
055                producers.put(key, answer);
056            }
057            return answer;
058        }
059    
060        /**
061         * Sends the exchange to the given endpoint
062         *
063         * @param endpoint the endpoint to send the exchange to
064         * @param exchange the exchange to send
065         */
066        public void send(Endpoint<E> endpoint, E exchange) {
067            try {
068                Producer<E> producer = getProducer(endpoint);
069                producer.process(exchange);
070            } catch (Exception e) {
071                throw new RuntimeCamelException(e);
072            }
073        }
074    
075        /**
076         * Sends an exchange to an endpoint using a supplied
077         * {@link Processor} to populate the exchange
078         *
079         * @param endpoint the endpoint to send the exchange to
080         * @param processor the transformer used to populate the new exchange
081         */
082        public E send(Endpoint<E> endpoint, Processor processor) {
083            try {
084                Producer<E> producer = getProducer(endpoint);
085                E exchange = producer.createExchange();
086                return sendExchange(endpoint, producer, processor, exchange);
087            } catch (Exception e) {
088                throw new RuntimeCamelException(e);
089            }
090        }
091    
092        /**
093         * Sends an exchange to an endpoint using a supplied
094         * {@link Processor} to populate the exchange.  The callback
095         * will be called when the exchange is completed.
096         *
097         * @param endpoint the endpoint to send the exchange to
098         * @param processor the transformer used to populate the new exchange
099         */
100        public E send(Endpoint<E> endpoint, Processor processor, AsyncCallback callback) {
101            try {
102                Producer<E> producer = getProducer(endpoint);
103                E exchange = producer.createExchange();
104                boolean sync = sendExchange(endpoint, producer, processor, exchange, callback);
105                setProcessedSync(exchange, sync);
106                return exchange;
107            } catch (Exception e) {
108                throw new RuntimeCamelException(e);
109            }
110        }
111    
112        public static boolean isProcessedSync(Exchange exchange) {
113            Boolean rc = exchange.getProperty(ProducerCache.class.getName() + ".SYNC", Boolean.class);
114            return rc == null ? false : rc;
115        }
116    
117        public static void setProcessedSync(Exchange exchange, boolean b) {
118            exchange.setProperty(ProducerCache.class.getName() + ".SYNC", b ? Boolean.TRUE : Boolean.FALSE);
119        }
120    
121        /**
122         * Sends an exchange to an endpoint using a supplied
123         * {@link Processor} to populate the exchange
124         *
125         * @param endpoint the endpoint to send the exchange to
126         * @param pattern the message {@link ExchangePattern} such as
127         *   {@link ExchangePattern#InOnly} or {@link ExchangePattern#InOut}
128         * @param processor the transformer used to populate the new exchange
129         */
130        public E send(Endpoint<E> endpoint, ExchangePattern pattern, Processor processor) {
131            try {
132                Producer<E> producer = getProducer(endpoint);
133                E exchange = producer.createExchange(pattern);
134                return sendExchange(endpoint, producer, processor, exchange);
135            } catch (Exception e) {
136                throw new RuntimeCamelException(e);
137            }
138        }
139    
140    
141        protected E sendExchange(Endpoint<E> endpoint, Producer<E> producer, Processor processor, E exchange) throws Exception {
142            // lets populate using the processor callback
143            processor.process(exchange);
144    
145            // now lets dispatch
146            if (LOG.isDebugEnabled()) {
147                LOG.debug(">>>> " + endpoint + " " + exchange);
148            }
149            producer.process(exchange);
150            return exchange;
151        }
152    
153        protected boolean sendExchange(Endpoint<E> endpoint, Producer<E> producer, Processor processor, E exchange, AsyncCallback callback) throws Exception {
154            // lets populate using the processor callback
155            processor.process(exchange);
156    
157            // now lets dispatch
158            if (LOG.isDebugEnabled()) {
159                LOG.debug(">>>> " + endpoint + " " + exchange);
160            }
161            return AsyncProcessorTypeConverter.convert(producer).process(exchange, callback);
162        }
163    
164        protected void doStop() throws Exception {
165            ServiceHelper.stopServices(producers.values());
166            producers.clear();
167        }
168    
169        protected void doStart() throws Exception {
170        }
171    }