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org.apache.commons.jelly.tags.jms.OnMessageTag$1 |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.jelly.tags.jms; |
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17 | ||
18 | import javax.jms.Message; |
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19 | import javax.jms.MessageListener; |
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20 | ||
21 | import org.apache.commons.jelly.JellyContext; |
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22 | import org.apache.commons.jelly.JellyTagException; |
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23 | import org.apache.commons.jelly.Script; |
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24 | import org.apache.commons.jelly.TagSupport; |
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25 | import org.apache.commons.jelly.XMLOutput; |
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26 | ||
27 | import org.apache.commons.logging.Log; |
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28 | import org.apache.commons.logging.LogFactory; |
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29 | ||
30 | /** |
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31 | * This tag creates a JMS MessageListener which will invoke this |
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32 | * tag's body whenever a JMS Message is received. The JMS Message |
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33 | * will be available via a variable, which defaults to the 'message' |
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34 | * variable name, but can be overloaded by the var attribute. |
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35 | * |
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36 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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37 | * @version $Revision: 1.6 $ |
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38 | */ |
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39 | public class OnMessageTag extends TagSupport { |
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40 | ||
41 | /** The Log to which logging calls will be made. */ |
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42 | private static final Log log = LogFactory.getLog(OnMessageTag.class); |
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43 | ||
44 | private String var = "message"; |
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45 | ||
46 | public OnMessageTag() { |
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47 | } |
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48 | ||
49 | // Tag interface |
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50 | //------------------------------------------------------------------------- |
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51 | public void doTag(XMLOutput output) throws JellyTagException { |
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52 | ConsumerTag tag = (ConsumerTag) findAncestorWithClass(ConsumerTag.class); |
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53 | if (tag == null) { |
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54 | throw new JellyTagException("This tag must be nested within a ConsumerTag like the subscribe tag"); |
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55 | } |
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56 | ||
57 | final JellyContext childContext = context.newJellyContext(); |
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58 | final Script script = getBody(); |
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59 | final XMLOutput childOutput = output; |
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60 | ||
61 | MessageListener listener = new MessageListener() { |
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62 | 0 | public void onMessage(Message message) { |
63 | 0 | childContext.setVariable(var, message); |
64 | try { |
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65 | 0 | script.run(childContext, childOutput); |
66 | 0 | } |
67 | catch (Exception e) { |
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68 | 0 | log.error("Caught exception processing message: " + message + ". Exception: " + e, e); |
69 | } |
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70 | 0 | } |
71 | }; |
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72 | ||
73 | // perform the consumption |
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74 | tag.setMessageListener(listener); |
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75 | } |
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76 | ||
77 | ||
78 | // Properties |
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79 | //------------------------------------------------------------------------- |
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80 | ||
81 | /** |
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82 | * Sets the name of the variable used to make the JMS message available to this tags |
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83 | * body when a message is received. |
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84 | */ |
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85 | public void setVar(String var) { |
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86 | this.var = class="keyword">var; |
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87 | } |
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88 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |