1 | /*
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2 | * Created on Oct 27, 2004
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3 | * Copyright (C) Andrea Schweer, 2004
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4 | *
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5 | * This file is part of the Greenstone Alerting Service.
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6 | * Refer to the COPYING file in the base directory of this package
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7 | * for licensing information.
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8 | */
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9 | package org.greenstone.gsdlas;
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10 |
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11 | import java.util.*;
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12 |
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13 | import javax.servlet.http.HttpSession;
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14 |
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15 | import org.greenstone.gsdlas.profiles.*;
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16 |
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17 | /**
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18 | * Storage for all Profiles. Singleton.
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19 | *
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20 | * @author schweer
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21 | *
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22 | */
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23 | public class ProfileStore {
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24 |
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25 | private static ProfileStore instance;
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26 |
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27 | private Map docIdEqualsSubscriptions = new TreeMap();
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28 | private Map collectionIdEqualsSubscriptions = new TreeMap();
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29 | private Map docCollectionIdEqualsSubscriptions = new TreeMap();
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30 | private Set noEqualsSubscriptions = new TreeSet();
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31 |
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32 | private ProfileStore() {
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33 | }
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34 |
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35 | /**
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36 | * @return the one existing instance of this class.
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37 | */
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38 | public static ProfileStore getInstance() {
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39 | if (instance == null) {
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40 | instance = new ProfileStore();
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41 | }
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42 | return instance;
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43 | }
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44 |
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45 | /**
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46 | * @param subscription
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47 | * the subscription to add to the profile store.
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48 | */
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49 | private void addSubscription(Subscription subscription) {
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50 | Predicate documentIdPredicate = subscription.getPredicate("documentID");
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51 | Predicate collectionIdPredicate = subscription.getPredicate("collectionID");
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52 |
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53 | if (documentIdPredicate != null) {
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54 | IdEqualsPredicate docIdPredicate
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55 | = (IdEqualsPredicate) documentIdPredicate;
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56 | if (collectionIdPredicate != null) {
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57 | IdEqualsPredicate collIdPredicate
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58 | = (IdEqualsPredicate) collectionIdPredicate;
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59 |
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60 | String[] values = new String[2];
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61 | values[0] = docIdPredicate.getValue();
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62 | values[1] = collIdPredicate.getValue();
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63 |
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64 | Set subList = (Set) docCollectionIdEqualsSubscriptions.get(values);
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65 | if (subList == null) {
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66 | subList = new TreeSet();
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67 | docCollectionIdEqualsSubscriptions.put(values, subList);
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68 | }
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69 | subList.add(subscription);
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70 | } else {
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71 | String value = docIdPredicate.getValue();
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72 | Set subList = (Set) docIdEqualsSubscriptions.get(value);
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73 | if (subList == null) {
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74 | subList = new TreeSet();
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75 | docIdEqualsSubscriptions.put(value, subList);
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76 | }
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77 | subList.add(subscription);
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78 | }
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79 | } else if (collectionIdPredicate != null) {
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80 | IdEqualsPredicate collIdPredicate
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81 | = (IdEqualsPredicate) collectionIdPredicate;
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82 |
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83 | String value = collIdPredicate.getValue();
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84 | Set subList = (Set) collectionIdEqualsSubscriptions.get(value);
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85 | if (subList == null) {
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86 | subList = new TreeSet();
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87 | collectionIdEqualsSubscriptions.put(value, subList);
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88 | }
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89 | subList.add(subscription);
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90 | } else {
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91 | noEqualsSubscriptions.add(subscription);
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92 | }
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93 | }
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94 |
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95 | /**
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96 | * @return
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97 | */
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98 | public Set getSubscriptionsWithoutEqualsPredicates() {
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99 | return Collections.unmodifiableSet(noEqualsSubscriptions);
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100 | }
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101 |
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102 | /**
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103 | * Computes the list of equality subscriptions satisfied by the event.
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104 | * @param event
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105 | * @return
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106 | */
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107 | public Set getPartiallyMatchedSubscriptions(Map event) {
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108 | Set result = new TreeSet();
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109 | if (event.get("documentID") != null) {
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110 | String documentID = (String) event.get("documentID");
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111 | if (event.get("collectionID") != null) {
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112 | String collectionID = (String) event.get("collectionID");
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113 | String[] values = new String[] {documentID, collectionID};
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114 | Set fromDocAndCollectionId = (Set) docCollectionIdEqualsSubscriptions.get(values);
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115 | if (fromDocAndCollectionId != null) {
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116 | result.addAll(fromDocAndCollectionId);
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117 | }
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118 | Set fromCollectionId = (Set) collectionIdEqualsSubscriptions.get(collectionID);
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119 | if (fromCollectionId != null) {
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120 | result.addAll(fromCollectionId);
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121 | }
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122 | }
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123 | Set fromDocId = (Set) collectionIdEqualsSubscriptions.get(documentID);
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124 | if (fromDocId != null) {
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125 | result.addAll(fromDocId);
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126 | }
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127 | } else if (event.get("collectionID") != null){
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128 | String collectionID = (String) event.get("collectionID");
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129 | Set fromCollectionId = (Set) collectionIdEqualsSubscriptions.get(collectionID);
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130 | if (fromCollectionId != null) {
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131 | result.addAll(fromCollectionId);
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132 | }
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133 | }
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134 | return result;
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135 | }
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136 |
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137 | /**
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138 | *
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139 | * @param gsComm TODO
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140 | * @return
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141 | * @throws UnsupportedFieldException
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142 | */
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143 | private Set findMatchedQueryPredicates(Map event, GreenstoneCommunicator gsComm) {
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144 | Set matchedPreds = new TreeSet();
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145 |
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146 | // iterate through all document content predicates
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147 | // execute the query stored in the predicate
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148 | // predicate is matched iff the docID occurs in the query result
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149 |
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150 | for (Iterator iter = PredicateFactory.getQueryPredicates("document_content").iterator(); iter.hasNext();) {
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151 | Predicate predicate = (Predicate) iter.next();
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152 | String collection = (String) event.get("collectionID");
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153 | String query = predicate.getValue();
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154 | Set results;
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155 | try {
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156 | results = gsComm.fullTextSearch(collection, query);
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157 | if (results.contains(event.get("documentID"))) {
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158 | matchedPreds.add(predicate);
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159 | }
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160 | } catch (Exception e) {
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161 | }
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162 | }
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163 |
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164 | return matchedPreds;
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165 | }
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166 |
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167 | /**
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168 | * Computes the set of SubstringMatchPredicates satisfied by the event.
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169 | * @param event
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170 | *
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171 | * @return
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172 | */
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173 | private Set findMatchedSubstringMatchPredicates(Map event) {
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174 | Set result = new TreeSet();
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175 |
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176 | for (Iterator iter = PredicateFactory.getAllSubstringMatchPredicates().iterator(); iter.hasNext();) {
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177 | Predicate predicate = (Predicate) iter.next();
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178 | if (predicate.isSatisfied(event)) {
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179 | result.add(predicate);
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180 | }
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181 | }
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182 | return result;
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183 | }
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184 |
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185 | /**
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186 | * Filters the event against the profiles. It uses the equality-preferred
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187 | * algorithm as described in Fabret, Llirbat, Pereira and Shasha:
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188 | * <em>Efficient Matching for Content-based Publish/Subscribe
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189 | * Systems</em>.
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190 | * @param event
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191 | * @param gsComm TODO
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192 | */
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193 | public Set filter(Map event, GreenstoneCommunicator gsComm) {
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194 | Set matchedSubscriptions = new TreeSet();
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195 |
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196 | Set partiallyMatchedSubscriptions
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197 | = getPartiallyMatchedSubscriptions(event);
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198 |
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199 | Set matchedPredicates = findMatchedSubstringMatchPredicates(event);
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200 | matchedPredicates.addAll(findMatchedQueryPredicates(event, gsComm));
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201 |
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202 | Map numMatchedPredicates = new TreeMap();
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203 | for (Iterator iter = matchedPredicates.iterator(); iter.hasNext();) {
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204 | Predicate pred = (Predicate) iter.next();
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205 | for (Iterator iterator = pred.getSubscriptionIDs().iterator(); iterator
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206 | .hasNext();) {
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207 | Subscription sub = (Subscription) iterator.next();
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208 | Integer count = (Integer) numMatchedPredicates.get(sub);
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209 | int newCountValue = (count == null ? 1 : count.intValue() + 1);
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210 | numMatchedPredicates.put(sub,
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211 | new Integer(newCountValue));
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212 | }
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213 | }
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214 |
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215 | Set notUnmatchedSubscriptions = partiallyMatchedSubscriptions;
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216 | notUnmatchedSubscriptions.addAll(noEqualsSubscriptions);
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217 | for (Iterator iter = notUnmatchedSubscriptions.iterator(); iter
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218 | .hasNext();) {
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219 | Subscription sub = (Subscription) iter.next();
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220 | int matchedPredicatesCount = 0;
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221 | if (numMatchedPredicates.get(sub) != null) {
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222 | matchedPredicatesCount = ((Integer) numMatchedPredicates.get(sub)).intValue();
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223 | }
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224 | if (matchedPredicatesCount == sub.getNumOfNonEqualsPredicates()) {
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225 | matchedSubscriptions.add(sub);
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226 | }
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227 | }
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228 | return matchedSubscriptions;
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229 | }
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230 |
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231 | public String toString() {
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232 | Set allSubscriptions = getAllSubscriptions();
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233 |
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234 | StringBuffer buffer = new StringBuffer();
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235 |
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236 | for (Iterator iter = allSubscriptions.iterator(); iter.hasNext();) {
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237 | Subscription sub = (Subscription) iter.next();
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238 | buffer.append(sub);
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239 | buffer.append("\n");
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240 | }
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241 |
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242 | return buffer.toString();
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243 | }
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244 |
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245 | /**
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246 | * @return
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247 | */
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248 | public Set getAllSubscriptions() {
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249 | Set allSubscriptions = new TreeSet();
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250 | allSubscriptions.addAll(noEqualsSubscriptions);
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251 |
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252 | for(Iterator iter = docIdEqualsSubscriptions.values().iterator(); iter.hasNext();) {
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253 | Set values = (Set) iter.next();
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254 | allSubscriptions.addAll(values);
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255 | }
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256 |
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257 | for(Iterator iter = docCollectionIdEqualsSubscriptions.values().iterator(); iter.hasNext();) {
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258 | Set values = (Set) iter.next();
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259 | allSubscriptions.addAll(values);
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260 | }
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261 |
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262 | for(Iterator iter = collectionIdEqualsSubscriptions.values().iterator(); iter.hasNext();) {
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263 | Set values = (Set) iter.next();
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264 | allSubscriptions.addAll(values);
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265 | }
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266 | return Collections.unmodifiableSet(allSubscriptions);
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267 | }
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268 |
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269 |
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270 | /**
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271 | * @param arguments
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272 | * @throws Exception
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273 | */
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274 | public void createSubscription(Map arguments) throws Exception {
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275 | Subscription sub = new Subscription(arguments);
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276 | addSubscription(sub);
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277 | }
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278 |
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279 |
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280 | /**
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281 | * @param subscriptionID
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282 | */
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283 | public void deleteSubscription(String subscriptionID) {
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284 | // TODO Auto-generated method stub
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285 |
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286 | }
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287 |
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288 | /**
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289 | * @param arguments
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290 | * @param session
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291 | */
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292 | public void changeSubscription(Map arguments, HttpSession session) {
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293 | String subscriptionID = (String) arguments.get("subscriptionID");
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294 | // TODO Auto-generated method stub
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295 |
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296 | }
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297 |
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298 | } |
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