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.processor;
018
019 import java.util.concurrent.ScheduledExecutorService;
020
021 import org.apache.camel.CamelContext;
022 import org.apache.camel.Exchange;
023 import org.apache.camel.Expression;
024 import org.apache.camel.Processor;
025 import org.apache.camel.Traceable;
026
027 /**
028 * A <a href="http://camel.apache.org/delayer.html">Delayer</a> which
029 * delays processing the exchange until the correct amount of time has elapsed
030 * using an expression to determine the delivery time.
031 * <p/>
032 * This implementation will block while waiting.
033 *
034 * @version
035 */
036 public class Delayer extends DelayProcessorSupport implements Traceable {
037 private Expression delay;
038 private long delayValue;
039
040 public Delayer(CamelContext camelContext, Processor processor, Expression delay,
041 ScheduledExecutorService executorService, boolean shutdownExecutorService) {
042 super(camelContext, processor, executorService, shutdownExecutorService);
043 this.delay = delay;
044 }
045
046 @Override
047 public String toString() {
048 return "Delayer[" + delay + " to: " + getProcessor() + "]";
049 }
050
051 public String getTraceLabel() {
052 return "delay[" + delay + "]";
053 }
054
055 public Expression getDelay() {
056 return delay;
057 }
058
059 public long getDelayValue() {
060 return delayValue;
061 }
062
063 public void setDelay(Expression delay) {
064 this.delay = delay;
065 }
066
067 // Implementation methods
068 // -------------------------------------------------------------------------
069
070 protected long calculateDelay(Exchange exchange) {
071 long time = 0;
072 if (delay != null) {
073 Long longValue = delay.evaluate(exchange, Long.class);
074 if (longValue != null) {
075 delayValue = longValue;
076 time = longValue;
077 } else {
078 delayValue = 0;
079 }
080 }
081 if (time <= 0) {
082 // no delay
083 return 0;
084 }
085
086 return time;
087 }
088
089 }