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 }