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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/AbstractCallContext.java @ 353:33d7a6da1a05

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Extended CallContext to also act as a blackboard/service broker. artifacts/trunk@3331 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 30 Nov 2011 08:24:55 +0000
parents a8a06bbe306c
children 1d11a0531242
rev   line source
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1 /*
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2 * Copyright (c) 2010, 2011 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 package de.intevation.artifactdatabase;
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9
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10 import java.util.ArrayList;
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11 import java.util.List;
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12 import java.util.HashMap;
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13
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14 import de.intevation.artifacts.ArtifactDatabase;
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15 import de.intevation.artifacts.CallContext;
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16 import de.intevation.artifacts.CallMeta;
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17 import de.intevation.artifacts.DataProvider;
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19
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20 /**
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21 * Abstract class that implements some basic methods of a CallContext.
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22 *
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23 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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24 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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25 */
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26 public abstract class AbstractCallContext implements CallContext {
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28 /**
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29 * The ArtifactDatabase instance.
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30 */
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31 protected ArtifactDatabaseImpl database;
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32
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33 /**
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34 * The action to be performed after the artifacts or collections calls.
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35 */
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36 protected int action;
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37
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38 /**
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39 * The meta information of the concrete call (preferred languages et. al.)
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40 */
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41 protected CallMeta callMeta;
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43 /**
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44 * Map to act like a clipboard when nesting calls like a proxy artifact.
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45 */
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46 protected HashMap customValues;
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47
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48 /**
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49 * Map to act like a clipboard when nesting calls like a proxy artifact.
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50 */
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51 protected HashMap<Object, List<DataProvider>> dataProviders;
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52
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53
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54 /**
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55 * The default constructor of this abstract CallContext.
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56 *
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57 * @param action The action.
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58 * @param callMeta The CallMeta object.
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59 * @param context The global context.
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60 */
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61 public AbstractCallContext(
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62 ArtifactDatabaseImpl artifactDatabase,
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63 int action,
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64 CallMeta callMeta
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65 ) {
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66 this.database = artifactDatabase;
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67 this.action = action;
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68 this.callMeta = callMeta;
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69
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70 database.initCallContext(this);
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71 }
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73
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74 public void postCall() {
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75 database.closeCallContext(this);
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76 }
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78 public abstract void afterCall(int action);
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79
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80 public abstract Long getTimeToLive();
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81
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82 public abstract void afterBackground(int action);
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83
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84
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85 public Object globalContext() {
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86 return database.context;
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87 }
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90 public ArtifactDatabase getDatabase() {
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91 return database;
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92 }
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95 public CallMeta getMeta() {
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96 return callMeta;
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97 }
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98
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100 public Object getContextValue(Object key) {
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101 return customValues != null
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102 ? customValues.get(key)
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103 : null;
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104 }
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105
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106 public Object putContextValue(Object key, Object value) {
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107 if (customValues == null) {
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108 customValues = new HashMap();
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109 }
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110 return customValues.put(key, value);
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111 }
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112
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113 /**
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114 * Get list of DataProviders that registered for given key.
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115 * @return list (empty list if none found, never null).
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116 */
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117 public List<DataProvider> getDataProvider(Object key) {
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118 return dataProviders != null
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119 ? dataProviders.get(key)
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120 : null;//java.util.Collections.emptyList();
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121 }
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122
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123 /**
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124 * Let a DataProvider register itself with given key.
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125 * Multiple DataProvider can register under the same key.
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126 */
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127 public Object registerDataProvider(Object key, DataProvider value) {
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128 List<DataProvider> providers = null;
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129 if (dataProviders == null) {
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130 dataProviders = new HashMap();
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131 providers = new ArrayList<DataProvider>();
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132 providers.add(value);
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133 return dataProviders.put(key, providers);
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134 }
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135 providers = dataProviders.get(key);
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136
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137 if (providers == null) {
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138 providers = new ArrayList<DataProvider>();
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139 }
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140 providers.add(value);
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141 return dataProviders.put(key, providers);
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142 }
219
cabe4c02ab64 Refactored the CallContextImpl - there are two concrete classes for Artifacts and ArtifactCollections now.
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143 }
cabe4c02ab64 Refactored the CallContextImpl - there are two concrete classes for Artifacts and ArtifactCollections now.
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144 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org