Mercurial > dive4elements > framework
annotate artifacts/src/main/java/de/intevation/artifacts/CallContext.java @ 331:089c6f7794b5
Integrated a messaging system for Artifacts and Collections that started background threads.
artifacts/trunk@2688 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Fri, 09 Sep 2011 14:06:55 +0000 |
parents | 3168af23aec5 |
children | 33d7a6da1a05 |
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1 /* |
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2 * Copyright (c) 2010 by Intevation GmbH |
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3 * |
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4 * This program is free software under the LGPL (>=v2.1) |
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5 * Read the file LGPL.txt coming with the software for details |
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6 * or visit http://www.gnu.org/licenses/ if it does not exist. |
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7 */ |
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8 |
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9 package de.intevation.artifacts; |
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10 |
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11 import java.util.LinkedList; |
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12 |
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13 import org.w3c.dom.Document; |
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14 import org.w3c.dom.Node; |
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15 |
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16 /** |
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17 * Instances of this interface are given to feed(), advance(), describe() |
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18 * and out() to enable the artifact to communicate with the runtime system. |
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19 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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20 */ |
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21 public interface CallContext |
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22 { |
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23 interface Listener { |
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24 void setup(Document config, Node listenerNode); |
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25 void init(CallContext callContext); |
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26 void close(CallContext callContext); |
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27 } |
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28 |
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29 /** |
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30 * Constant to signal that nothing should be done |
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31 * with the artifact after method return. |
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32 */ |
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33 int NOTHING = 0; |
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34 /** |
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35 * Constant to signal that the database timestamp |
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36 * should be updated after method return. |
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37 */ |
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38 int TOUCH = 1; |
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39 /** |
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40 * Constant to signal that the artifact should be stored |
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41 * after method return. |
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42 */ |
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43 int STORE = 2; |
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44 /** |
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45 * Constant to signal that the artifact fork a backgroud thread |
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46 * and should be hold in memory till it signals that it has |
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47 * finished its operation. |
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48 */ |
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49 int BACKGROUND = 3; |
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50 // int DELETE = 4; |
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51 // int FOREVER = 5; |
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52 |
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53 /** |
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54 * This method may be called from feed(), describe(), advance() |
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55 * and out to signal what should happend with artefact after |
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56 * the current method call returns. |
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57 * @param action Valid values are NOTHING, TOUCH, STORE, BACKGROUND. |
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58 */ |
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59 void afterCall(int action); |
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60 |
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61 /** |
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62 * When send to background with a afterCall(BACKGROUND) this |
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63 * method is to be called from the background thread to signal |
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64 * that the background operation has ended. |
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65 * @param action Same semantics as in afterCall. |
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66 */ |
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67 void afterBackground(int action); |
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68 |
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69 /** |
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70 * Returns true, if the object forked a background thread and has not |
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71 * finished it yet. |
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72 */ |
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73 boolean isInBackground(); |
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74 |
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75 /** |
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76 * Adds a background message for the current Artifact or Collection. |
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77 * |
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78 * @param msg The message. |
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79 */ |
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80 void addBackgroundMessage(Message msg); |
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81 |
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82 /** |
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83 * Returns the background messages of the current Artifact or Collection. |
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84 * |
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85 * @return the list of background messages. |
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86 */ |
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87 LinkedList<Message> getBackgroundMessages(); |
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88 |
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89 /** |
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90 * Access to the global context of the runtime system. |
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91 * @return The global context. |
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92 */ |
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93 Object globalContext(); |
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94 |
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95 /** |
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96 * Access to the artifact database itself. |
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97 * @return The database. |
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98 */ |
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99 ArtifactDatabase getDatabase(); |
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100 |
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101 /** |
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102 * The meta data of the current call. Used to transport |
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103 * language preferences of the callee e.g. |
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104 * @return The meta information of this call. |
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105 */ |
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106 CallMeta getMeta(); |
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107 |
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108 /** |
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109 * Each call context has a clipboard. |
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110 * getContextValue is used to fetch data from this board. |
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111 * @param key Key of the requested item. |
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112 * @return The value stored for the secified value, null if |
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113 * no item with this key exists. |
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114 */ |
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115 Object getContextValue(Object key); |
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116 |
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117 /** |
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118 * Each call context has a clipboard. |
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119 * putContextValue is used to store a key/value pair onto this board. |
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120 * @param key The key of the pair |
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121 * @param value The value of the pair. |
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122 * @return The formerly stored value under the given key. |
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123 */ |
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124 Object putContextValue(Object key, Object value); |
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125 |
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126 /** |
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127 * Returns the time to live of the current artifact. |
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128 * @return The time to live of the current artifact. |
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129 */ |
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130 Long getTimeToLive(); |
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131 } |
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132 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |