source: trunk/greenstone3-extensions/gsdl-as/src/org/greenstone/gsdlas/ProfileStore.java@ 8874

Last change on this file since 8874 was 8874, checked in by schweer, 19 years ago

todo tags etc
  • Property svn:keywords set to Author Date Id Revision
File size: 15.0 KB
Line 
1/*
2 * Created on Oct 27, 2004
3 * Copyright (C) Andrea Schweer, 2004
4 *
5 * This file is part of the Greenstone Alerting Service.
6 * Refer to the COPYING file in the base directory of this package
7 * for licensing information.
8 */
9package org.greenstone.gsdlas;
10
11import java.sql.*;
12import java.sql.Connection;
13import java.sql.Statement;
14import java.util.*;
15
16import javax.servlet.http.HttpSession;
17
18import org.greenstone.gsdlas.database.DatabaseException;
19import org.greenstone.gsdlas.database.DatabaseManager;
20import org.greenstone.gsdlas.profiles.*;
21
22/**
23 * Storage for all Profiles. Singleton.
24 *
25 * @author schweer
26 *
27 */
28public class ProfileStore {
29
30 private static ProfileStore instance;
31
32 private Set noEqualsSubscriptions = new TreeSet();
33 private Map dontCareSubscriptions = new TreeMap();
34 private Map subscriptions = new TreeMap();
35
36
37 private ProfileStore() {
38 }
39
40 /**
41 * @return the one existing instance of this class.
42 */
43 public static ProfileStore getInstance() {
44 if (instance == null) {
45 instance = new ProfileStore();
46 }
47 return instance;
48 }
49
50 /**
51 * @param subscription
52 * the subscription to add to the profile store.
53 */
54 private void addSubscription(Subscription subscription) {
55 List documentIdPredicate = subscription.getPredicateList(Constants.DOCUMENT_ID_FIELD);
56 List collectionIdPredicate = subscription.getPredicateList(Constants.COLLECTION_ID_FIELD);
57 List hostIdPredicate = subscription.getPredicateList(Constants.HOST_ID_FIELD);
58 List typePredicate = subscription.getPredicateList(Constants.TYPE_FIELD);
59
60 Integer subId = new Integer(subscription.getId());
61
62 if (documentIdPredicate.isEmpty()) {
63 if (!dontCareSubscriptions.containsKey(Constants.DOCUMENT_ID_FIELD)) {
64 dontCareSubscriptions.put(Constants.DOCUMENT_ID_FIELD, new TreeSet());
65 }
66 Set list = (Set) dontCareSubscriptions.get(Constants.DOCUMENT_ID_FIELD);
67 list.add(subId);
68 }
69 if (collectionIdPredicate.isEmpty()) {
70 if (!dontCareSubscriptions.containsKey(Constants.COLLECTION_ID_FIELD)) {
71 dontCareSubscriptions.put(Constants.COLLECTION_ID_FIELD, new TreeSet());
72 }
73 Set list = (Set) dontCareSubscriptions.get(Constants.COLLECTION_ID_FIELD);
74 list.add(subId);
75 }
76 if (hostIdPredicate.isEmpty()) {
77 if (!dontCareSubscriptions.containsKey(Constants.HOST_ID_FIELD)) {
78 dontCareSubscriptions.put(Constants.HOST_ID_FIELD, new TreeSet());
79 }
80 Set list = (Set) dontCareSubscriptions.get(Constants.HOST_ID_FIELD);
81 list.add(subId);
82 }
83 if (typePredicate.isEmpty()) {
84 if (!dontCareSubscriptions.containsKey(Constants.TYPE_FIELD)) {
85 dontCareSubscriptions.put(Constants.TYPE_FIELD, new TreeSet());
86 }
87 Set list = (Set) dontCareSubscriptions.get(Constants.TYPE_FIELD);
88 list.add(subId);
89 }
90
91 if (documentIdPredicate.isEmpty() && collectionIdPredicate.isEmpty()
92 && hostIdPredicate.isEmpty() && typePredicate.isEmpty()) {
93 noEqualsSubscriptions.add(subId);
94 }
95 subscriptions.put(subId, subscription);
96 }
97
98 /**
99 * @return
100 */
101 public Set getSubscriptionsWithoutEqualsPredicates() {
102 return Collections.unmodifiableSet(noEqualsSubscriptions);
103 }
104
105 /**
106 * Computes the list of equality subscriptions satisfied by the event.
107 * @param event
108 * @return
109 */
110 public Set getPartiallyMatchedSubscriptions(Map event) {
111 Set result = new TreeSet();
112 IdEqualsPredicate predicate;
113 predicate = PredicateFactory.getIdEqualsPredicate(Constants.TYPE_FIELD,
114 (String)event.get(Constants.TYPE_FIELD));
115 if (predicate != null)
116 result.addAll(predicate.getSubscriptionIDs());
117
118 Set docIDSubs = new TreeSet();
119 predicate = PredicateFactory.getIdEqualsPredicate(Constants.DOCUMENT_ID_FIELD,
120 (String)event.get(Constants.DOCUMENT_ID_FIELD));
121 if (predicate != null)
122 docIDSubs.addAll(predicate.getSubscriptionIDs());
123 docIDSubs.addAll(getDontCareSubscriptions(Constants.DOCUMENT_ID_FIELD));
124 result.retainAll(docIDSubs);
125
126 Set collIDSubs = new TreeSet();
127 predicate = PredicateFactory.getIdEqualsPredicate(Constants.COLLECTION_ID_FIELD,
128 (String)event.get(Constants.COLLECTION_ID_FIELD));
129 if (predicate != null)
130 collIDSubs.addAll(predicate.getSubscriptionIDs());
131 collIDSubs.addAll(getDontCareSubscriptions(Constants.COLLECTION_ID_FIELD));
132 result.retainAll(collIDSubs);
133
134 Set hostIDSubs = new TreeSet();
135 predicate = PredicateFactory.getIdEqualsPredicate(Constants.HOST_ID_FIELD,
136 (String)event.get(Constants.HOST_ID_FIELD));
137 if (predicate != null)
138 hostIDSubs.addAll(predicate.getSubscriptionIDs());
139 hostIDSubs.addAll(getDontCareSubscriptions(Constants.HOST_ID_FIELD));
140 result.retainAll(hostIDSubs);
141
142 return result;
143 }
144
145 /**
146 *
147 * @param gsComm
148 * @return
149 * @throws UnsupportedFieldException
150 */
151 private Set findMatchedQueryPredicates(Map event, GreenstoneCommunicator gsComm) {
152 Set matchedPreds = new TreeSet();
153
154 // iterate through all document content predicates
155 // execute the query stored in the predicate
156 // predicate is matched iff the docID occurs in the query result
157
158 for (Iterator iter = PredicateFactory.getQueryPredicates(Constants.DOCUMENT_CONTENT_FIELD).iterator(); iter.hasNext();) {
159 Predicate predicate = (Predicate) iter.next();
160 String collection = (String) event.get(Constants.COLLECTION_ID_FIELD);
161 String query = predicate.getValue();
162 Set results;
163 try {
164 results = gsComm.fullTextSearch(collection, query);
165 if (results.contains(event.get(Constants.DOCUMENT_ID_FIELD))) {
166 matchedPreds.add(predicate);
167 }
168 } catch (Exception e) {
169 }
170 }
171
172 return matchedPreds;
173 }
174
175 /**
176 * Computes the set of SubstringMatchPredicates satisfied by the event.
177 * @param event
178 *
179 * @return
180 */
181 private Set findMatchedSubstringMatchPredicates(Map event) {
182 Set result = new TreeSet();
183
184 for (Iterator iter = PredicateFactory.getAllSubstringMatchPredicates().iterator(); iter.hasNext();) {
185 Predicate predicate = (Predicate) iter.next();
186 if (predicate.isSatisfied(event)) {
187 result.add(predicate);
188 }
189 }
190 return result;
191 }
192
193 /**
194 * Filters the event against the profiles. It uses the equality-preferred
195 * algorithm as described in Fabret, Llirbat, Pereira and Shasha:
196 * <em>Efficient Matching for Content-based Publish/Subscribe
197 * Systems</em>.
198 * @param event
199 * @param gsComm
200 */
201 public Set filter(Map event, GreenstoneCommunicator gsComm) {
202 Set matchedSubscriptions = new TreeSet();
203
204 Set partiallyMatchedSubscriptions
205 = getPartiallyMatchedSubscriptions(event);
206
207 Set matchedPredicates = findMatchedSubstringMatchPredicates(event);
208 matchedPredicates.addAll(findMatchedQueryPredicates(event, gsComm));
209
210 Map numMatchedPredicates = new TreeMap();
211 for (Iterator iter = matchedPredicates.iterator(); iter.hasNext();) {
212 Predicate pred = (Predicate) iter.next();
213 for (Iterator iterator = pred.getSubscriptionIDs().iterator(); iterator
214 .hasNext();) {
215 Integer subId = (Integer) iterator.next();
216 Subscription sub = (Subscription) subscriptions.get(subId);
217 Integer count = (Integer) numMatchedPredicates.get(subId);
218 int newCountValue = (count == null ? 1 : count.intValue() + 1);
219 numMatchedPredicates.put(subId,
220 new Integer(newCountValue));
221 }
222 }
223
224 Set notUnmatchedSubscriptions = partiallyMatchedSubscriptions;
225 notUnmatchedSubscriptions.addAll(noEqualsSubscriptions);
226 for (Iterator iter = notUnmatchedSubscriptions.iterator(); iter
227 .hasNext();) {
228 Integer subId = (Integer) iter.next();
229 Subscription sub = (Subscription) subscriptions.get(subId);
230 int matchedPredicatesCount = 0;
231 if (numMatchedPredicates.get(subId) != null) {
232 matchedPredicatesCount = ((Integer) numMatchedPredicates.get(subId)).intValue();
233 }
234 if (matchedPredicatesCount == sub.getNumOfNonEqualsPredicates()) {
235 matchedSubscriptions.add(sub);
236 }
237 }
238 return matchedSubscriptions;
239 }
240
241
242 /**
243 * @param arguments
244 * @throws Exception
245 */
246 public void createSubscription(Map arguments) throws Exception {
247 Subscription sub = new Subscription(arguments);
248 addSubscription(sub);
249 }
250
251
252 /**
253 * @param subscriptionID
254 * @throws DatabaseException
255 * @throws SQLException
256 */
257 public void deleteSubscription(String subscriptionID) throws DatabaseException, SQLException {
258 Integer subID = new Integer(subscriptionID);
259 System.out.println("deleting subscription " + subscriptionID);
260 if (!subscriptions.containsKey(subID)) {
261 return;
262 }
263 Subscription sub = (Subscription) subscriptions.get(subID);
264 for (Iterator iter = dontCareSubscriptions.values().iterator(); iter.hasNext();) {
265 Set entry = (Set) iter.next();
266 if (entry.contains(subID))
267 entry.remove(subID);
268 }
269 if (noEqualsSubscriptions.contains(subID))
270 noEqualsSubscriptions.remove(subID);
271 for (Iterator iter = sub.getPredicates().iterator(); iter.hasNext();) {
272 Predicate pred = (Predicate) iter.next();
273 pred.removeSubscription(subID);
274 }
275
276 subscriptions.remove(subID);
277
278
279 Connection conn = DatabaseManager.getInstance().getDatabaseConnection();
280
281 Statement statement = conn.createStatement();
282
283 String sqlString = "DELETE FROM subscriptions WHERE id = " + subscriptionID;
284 statement.executeUpdate(sqlString);
285
286 sqlString = "SELECT predicate FROM subs_to_predicates " +
287 "WHERE subscription = " + subscriptionID;
288 ResultSet predicates = statement.executeQuery(sqlString);
289 while (predicates.next()) {
290 // if there aren't any other subscriptions using this predicate, delete predicate
291 int predicateID = predicates.getInt("predicate");
292
293 }
294
295
296 }
297
298 /**
299 * @param arguments
300 * @param session
301 */
302 public void changeSubscription(Map arguments, HttpSession session) {
303 String subscriptionID = (String) arguments.get("subscriptionID");
304 // BTS 14 really edit the subscription
305
306 }
307
308 /**
309 * @param username
310 * @return
311 * @throws DatabaseException
312 */
313 public Set getAllSubscriptionsFor(String username) throws DatabaseException {
314 Set result = new TreeSet();
315 try {
316 Connection conn = DatabaseManager.getInstance().getDatabaseConnection();
317 Statement statement = conn.createStatement();
318 String sqlString = "SELECT id FROM subscriptions " +
319 "WHERE user like '" + username + "';";
320 ResultSet idList = statement.executeQuery(sqlString);
321 while (idList.next()) {
322 int id = idList.getInt("id");
323 result.add(subscriptions.get(new Integer(id)));
324 }
325 } catch (SQLException e) {
326 e.printStackTrace();
327 }
328
329 return result;
330 }
331
332 /**
333 * @param string
334 * @return
335 */
336 private Set getDontCareSubscriptions(String field) {
337 Set result = new TreeSet();
338 if (dontCareSubscriptions.containsKey(field)) {
339 result = (Set) dontCareSubscriptions.get(field);
340 }
341 return result;
342 }
343
344 /**
345 *
346 */
347 public void restoreFromDatabase() {
348 try {
349 Connection conn = DatabaseManager.getInstance().getDatabaseConnection();
350 Statement statement = conn.createStatement();
351 String sqlString = "SELECT * FROM subscriptions";
352 ResultSet subs = statement.executeQuery(sqlString);
353 while (subs.next()) {
354 // construct map for all predicates
355 int id = subs.getInt("id");
356 Map map = new TreeMap();
357 map.put("username", subs.getString("user"));
358 map.put("email", subs.getString("email"));
359 map.put("subscription_name", subs.getString("name"));
360 Vector ways = new Vector();
361 if (subs.getInt("rss") != 0) {
362 ways.add("rss");
363 }
364 if (subs.getInt("page") != 0) {
365 ways.add("page");
366 }
367 map.put("way", ways);
368 Statement stmnt = conn.createStatement();
369 sqlString = "SELECT p.type, p.field, p.value from subs_to_predicates stp join predicates p on(stp.predicate = p.id) where stp.subscription = " + id + ";";
370 ResultSet predicates = stmnt.executeQuery(sqlString);
371 while (predicates.next()) {
372 String type = predicates.getString(Constants.TYPE_FIELD);
373 String field = predicates.getString("field");
374 if (type.equals(SubstringMatchPredicate.class.getName())) {
375 if (field.equals(Constants.COLLECTION_ID_FIELD)) {
376 field = Constants.COLLECTION_QUERY_FIELD;
377 } else if (field.equals(Constants.HOST_ID_FIELD)) {
378 field = Constants.HOST_QUERY_FIELD;
379 }
380 }
381 String value = predicates.getString("value");
382 if (type.equals(IdEqualsPredicate.class.getName())) {
383 if (!map.containsKey(field)) {
384 map.put(field, new Vector());
385 }
386 ((List) map.get(field)).add(value);
387 } else {
388 map.put(field, value);
389 }
390 }
391 try {
392 createSubscription(map);
393 } catch (Exception e1) {
394 // TODO Auto-generated catch block
395 e1.printStackTrace();
396 }
397 }
398 } catch (SQLException e) {
399 // TODO Auto-generated catch block
400 e.printStackTrace();
401 } catch (DatabaseException e) {
402 // TODO Auto-generated catch block
403 e.printStackTrace();
404 }
405 }
406
407}
Note: See TracBrowser for help on using the repository browser.