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