Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
Delayer |
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| 0.0;0 |
1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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3 | * contributor license agreements. See the NOTICE file distributed with |
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4 | * this work for additional information regarding copyright ownership. |
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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6 | * (the "License"); you may not use this file except in compliance with |
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7 | * the License. You may obtain a copy of the License at |
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8 | * |
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9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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10 | * |
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11 | * Unless required by applicable law or agreed to in writing, software |
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12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | * See the License for the specific language governing permissions and |
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15 | * limitations under the License. |
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16 | */ |
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17 | package org.apache.camel.processor; |
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18 | ||
19 | import org.apache.camel.Exchange; |
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20 | import org.apache.camel.Expression; |
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21 | import org.apache.camel.Processor; |
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22 | import org.apache.camel.util.ExpressionHelper; |
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23 | ||
24 | /** |
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25 | * A <a href="http://activemq.apache.org/camel/delayer.html">Delayer</a> which |
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26 | * delays processing the exchange until the correct amount of time has elapsed |
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27 | * using an expression to determine the delivery time. <p/> For example if you |
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28 | * wish to delay JMS messages by 25 seconds from their publish time you could |
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29 | * create an instance of this class with the expression |
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30 | * <code>header("JMSTimestamp")</code> and a delay value of 25000L. |
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31 | * |
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32 | * @version $Revision: 1.1 $ |
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33 | */ |
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34 | public class Delayer extends DelayProcessorSupport { |
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35 | private Expression<Exchange> timeExpression; |
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36 | private long delay; |
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37 | ||
38 | public Delayer(Processor processor, Expression<Exchange> timeExpression, long delay) { |
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39 | 3 | super(processor); |
40 | 3 | this.timeExpression = timeExpression; |
41 | 3 | this.delay = delay; |
42 | 3 | } |
43 | ||
44 | @Override |
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45 | public String toString() { |
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46 | 3 | return "Delayer[on: " + timeExpression + " delay: " + delay + " to: " + getProcessor() + "]"; |
47 | } |
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48 | ||
49 | // Properties |
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50 | // ------------------------------------------------------------------------- |
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51 | public long getDelay() { |
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52 | 0 | return delay; |
53 | } |
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54 | ||
55 | /** |
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56 | * Sets the delay from the publish time; which is typically the time from |
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57 | * the expression or the current system time if none is available |
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58 | */ |
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59 | public void setDelay(long delay) { |
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60 | 0 | this.delay = delay; |
61 | 0 | } |
62 | ||
63 | // Implementation methods |
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64 | // ------------------------------------------------------------------------- |
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65 | ||
66 | /** |
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67 | * Waits for an optional time period before continuing to process the |
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68 | * exchange |
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69 | */ |
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70 | protected void delay(Exchange exchange) throws Exception { |
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71 | 3 | long time = 0; |
72 | 3 | if (timeExpression != null) { |
73 | 3 | Long longValue = ExpressionHelper.evaluateAsType(timeExpression, exchange, Long.class); |
74 | 3 | if (longValue != null) { |
75 | 3 | time = longValue.longValue(); |
76 | } |
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77 | } |
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78 | 3 | if (time <= 0) { |
79 | 0 | time = defaultProcessTime(exchange); |
80 | } |
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81 | ||
82 | 3 | time += delay; |
83 | ||
84 | 3 | waitUntil(time, exchange); |
85 | 3 | } |
86 | ||
87 | /** |
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88 | * A Strategy Method to allow derived implementations to decide the current |
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89 | * system time or some other default exchange property |
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90 | * |
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91 | * @param exchange |
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92 | */ |
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93 | protected long defaultProcessTime(Exchange exchange) { |
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94 | 0 | return currentSystemTime(); |
95 | } |
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96 | ||
97 | } |