Source Code Cross Referenced for PostgisFeatureLocking.java in  » GIS » GeoTools-2.4.1 » org » geotools » data » postgis » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.data.postgis 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2003-2006, GeoTools Project Managment Committee (PMC)
005:         * 
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation;
009:         *    version 2.1 of the License.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         */
016:        package org.geotools.data.postgis;
017:
018:        import java.io.IOException;
019:        import java.util.NoSuchElementException;
020:        import java.util.logging.Logger;
021:
022:        import org.geotools.data.DataSourceException;
023:        import org.geotools.data.DefaultQuery;
024:        import org.geotools.data.FeatureLock;
025:        import org.geotools.data.FeatureLockException;
026:        import org.geotools.data.FeatureLocking;
027:        import org.geotools.data.FeatureReader;
028:        import org.geotools.data.LockingManager;
029:        import org.geotools.data.Query;
030:        import org.geotools.feature.Feature;
031:        import org.geotools.feature.FeatureIterator;
032:        import org.geotools.feature.FeatureType;
033:        import org.geotools.feature.IllegalAttributeException;
034:        import org.opengis.filter.Filter;
035:
036:        /**
037:         * Extends PostgisFeatureLocking with support for Locking.
038:         * 
039:         * <p>
040:         * This class will be, horror, modey. While the are plenty of Object Oriented
041:         * ways to fix this I have a deadline right now.
042:         * </p>
043:         * 
044:         * <p>
045:         * When the DataStore is constructed it will create a LockingManager only if
046:         * the Postgis implementation does not support database locking. If the
047:         * lockingManger is present it will be used.
048:         * </p>
049:         * 
050:         * <p>
051:         * If the lockingManger is not present, the this class will use Database
052:         * locking
053:         * </p>
054:         *
055:         * @author Jody Garnett, Refractions Research, Inc
056:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/plugin/postgis/src/main/java/org/geotools/data/postgis/PostgisFeatureLocking.java $
057:         * @version $Id: PostgisFeatureLocking.java 27862 2007-11-12 19:51:19Z desruisseaux $
058:         */
059:        public class PostgisFeatureLocking extends PostgisFeatureStore
060:                implements  FeatureLocking {
061:            /** The logger for the postgis module. */
062:            private static final Logger LOGGER = org.geotools.util.logging.Logging
063:                    .getLogger("org.geotools.data.postgis");
064:            FeatureLock featureLock = FeatureLock.TRANSACTION;
065:
066:            public PostgisFeatureLocking(PostgisDataStore postgisDataStore,
067:                    FeatureType featureType) throws IOException {
068:                super (postgisDataStore, featureType);
069:            }
070:
071:            /**
072:             * Provide a FeatureLock for locking opperations to opperate against.
073:             * 
074:             * <p>
075:             * Initial Transactional duration locks can be restored with
076:             * setFeatureLock( FetaureLock.TRANSACTION )
077:             * </p>
078:             *
079:             * @param lock FeatureLock (or FeatureLock.TRANSACTION );
080:             *
081:             * @throws NullPointerException If lock was <code>null</code>
082:             *
083:             * @see org.geotools.data.FeatureLocking#setFeatureLock(org.geotools.data.FeatureLock)
084:             */
085:            public void setFeatureLock(FeatureLock lock) {
086:                if (lock == null) {
087:                    throw new NullPointerException(
088:                            "A FeatureLock is required - did you mean FeatureLock.TRANSACTION?");
089:                }
090:
091:                featureLock = lock;
092:            }
093:
094:            /**
095:             * Lock all Features
096:             *
097:             * @return Number of Locked features
098:             *
099:             * @throws IOException
100:             *
101:             * @see org.geotools.data.FeatureLocking#lockFeatures()
102:             */
103:            public int lockFeatures() throws IOException {
104:                return lockFeatures(Filter.INCLUDE);
105:            }
106:
107:            /**
108:             * Lock features matching <code>filter</code>.
109:             *
110:             * @param filter
111:             *
112:             * @return Number of locked Features
113:             *
114:             * @throws IOException
115:             *
116:             * @see org.geotools.data.FeatureLocking#lockFeatures(org.geotools.filter.Filter)
117:             */
118:            public int lockFeatures(Filter filter) throws IOException {
119:                return lockFeatures(new DefaultQuery(getSchema().getTypeName(),
120:                        filter));
121:            }
122:
123:            public int lockFeatures(org.geotools.filter.Filter filter)
124:                    throws IOException {
125:                return lockFeatures(new DefaultQuery(getSchema().getTypeName(),
126:                        filter));
127:            }
128:
129:            /**
130:             * Lock features matching Query.
131:             * 
132:             * <p>
133:             * FeatureStores that have provided their own locking to will need to
134:             * override this method.
135:             * </p>
136:             *
137:             * @param query
138:             *
139:             * @return Number of locked Features
140:             *
141:             * @throws IOException If we could not determine which feature to lock
142:             *         based on Query
143:             * @throws UnsupportedOperationException When DataStore does not provide a
144:             *         LockingManager
145:             * @throws DataSourceException If feature to be locked does not exist
146:             *
147:             * @see org.geotools.data.FeatureLocking#lockFeatures(org.geotools.data.Query)
148:             */
149:            public int lockFeatures(Query query) throws IOException {
150:                LockingManager lockingManager = getDataStore()
151:                        .getLockingManager();
152:
153:                if (lockingManager == null) {
154:                    throw new UnsupportedOperationException(
155:                            "DataStore not using lockingManager, must provide alternate implementation");
156:                }
157:
158:                String typeName = getSchema().getTypeName();
159:
160:                if ((query.getTypeName() != null)
161:                        && !typeName.equals(query.getTypeName())) {
162:                    throw new IOException("Query typeName does not match "
163:                            + getSchema().getTypeName() + ":" + query);
164:                }
165:
166:                // Reduce the Query to only return the FetureID here?
167:                // Good idea, but it's not working right now, so we're just using the query passed in.
168:                Query optimizedQuery = new DefaultQuery(typeName, query
169:                        .getFilter(), query.getMaxFeatures(), Query.NO_NAMES,
170:                        query.getHandle());
171:                FeatureIterator reader = getFeatures(query).features();
172:                Feature feature;
173:                int count = 0;
174:                LOGGER.info("got reader from query " + optimizedQuery
175:                        + ", reader has next " + reader.hasNext());
176:
177:                try {
178:                    while (reader.hasNext()) {
179:                        try {
180:                            feature = reader.next();
181:                            lockingManager.lockFeatureID(typeName, feature
182:                                    .getID(), transaction, featureLock);
183:                            count++;
184:                            LOGGER.info("locked feature " + feature);
185:                        } catch (FeatureLockException locked) {
186:                            LOGGER.info("feature lock exception");
187:
188:                            // could not aquire - don't increment count                
189:                        } catch (NoSuchElementException nosuch) {
190:                            throw new DataSourceException("Problem with "
191:                                    + query.getHandle() + " while locking",
192:                                    nosuch);
193:                        }
194:                    }
195:                } finally {
196:                    reader.close();
197:                }
198:
199:                return count;
200:            }
201:
202:            /**
203:             * HACK HACK HACK!!!  Don't use unless you're working on geoserver. just
204:             * using ints for return now, to easily swap out with what we've got going
205:             * on right now.
206:             *
207:             * @param feature DOCUMENT ME!
208:             *
209:             * @return DOCUMENT ME!
210:             *
211:             * @throws IOException DOCUMENT ME!
212:             * @throws UnsupportedOperationException DOCUMENT ME!
213:             */
214:            public int lockFeature(Feature feature) throws IOException {
215:                LockingManager lockingManager = getDataStore()
216:                        .getLockingManager();
217:
218:                if (lockingManager == null) {
219:                    throw new UnsupportedOperationException(
220:                            "DataStore not using lockingManager, must provide alternate implementation");
221:                }
222:
223:                try {
224:                    //TODO: more checking here, check feature.typename == this.typename
225:                    //perhaps even feature.getFeatureType == this.featureType.
226:                    lockingManager.lockFeatureID(tableName, feature.getID(),
227:                            getTransaction(), featureLock);
228:
229:                    return 1;
230:                } catch (FeatureLockException locked) {
231:                    return 0;
232:                }
233:            }
234:
235:            /**
236:             * Unlock all Features.
237:             *
238:             * @throws IOException
239:             *
240:             * @see org.geotools.data.FeatureLocking#unLockFeatures()
241:             */
242:            public void unLockFeatures() throws IOException {
243:                unLockFeatures(Filter.INCLUDE);
244:            }
245:
246:            /**
247:             * Unlock Features specified by <code>filter</code>.
248:             *
249:             * @param filter
250:             *
251:             * @throws IOException
252:             *
253:             * @see org.geotools.data.FeatureLocking#unLockFeatures(org.geotools.filter.Filter)
254:             */
255:            public void unLockFeatures(Filter filter) throws IOException {
256:                unLockFeatures(new DefaultQuery(getSchema().getTypeName(),
257:                        filter));
258:            }
259:
260:            /**
261:             * Unlock features specified by the <code>query</code>.
262:             * 
263:             * <p>
264:             * FeatureStores that have provided their own locking to will need to
265:             * override this method.
266:             * </p>
267:             *
268:             * @param query
269:             *
270:             * @throws IOException
271:             * @throws UnsupportedOperationException If lockingManager is not provided
272:             *         by DataStore subclass
273:             * @throws DataSourceException Filter describes an unlocked Feature, or
274:             *         authorization not held
275:             *
276:             * @see org.geotools.data.FeatureLocking#unLockFeatures(org.geotools.data.Query)
277:             */
278:            public void unLockFeatures(Query query) throws IOException {
279:                LockingManager lockingManager = getDataStore()
280:                        .getLockingManager();
281:
282:                if (lockingManager == null) {
283:                    throw new UnsupportedOperationException(
284:                            "DataStore not using lockingManager, must provide alternate implementation");
285:                }
286:
287:                // Could we reduce the Query to only return the FetureID here?
288:                //
289:                FeatureIterator reader = getFeatures(query).features();
290:                String typeName = getSchema().getTypeName();
291:                Feature feature;
292:
293:                try {
294:                    while (reader.hasNext()) {
295:                        try {
296:                            feature = reader.next();
297:                            lockingManager.unLockFeatureID(typeName, feature
298:                                    .getID(), getTransaction(), featureLock);
299:                        } catch (NoSuchElementException nosuch) {
300:                            throw new DataSourceException("Problem with "
301:                                    + query.getHandle() + " while locking",
302:                                    nosuch);
303:                        }
304:                    }
305:                } finally {
306:                    reader.close();
307:                }
308:            }
309:        }
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