Source Code Cross Referenced for DbDirectory.java in  » Net » lucene-connector » org » apache » lucene » store » db » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » lucene connector » org.apache.lucene.store.db 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.lucene.store.db;
002:
003:        /**
004:         * Licensed to the Apache Software Foundation (ASF) under one or more
005:         * contributor license agreements.  See the NOTICE file distributed with
006:         * this work for additional information regarding copyright ownership.
007:         * The ASF licenses this file to You under the Apache License, Version 2.0
008:         * (the "License"); you may not use this file except in compliance with
009:         * the License.  You may obtain a copy of the License at
010:         *
011:         *     http://www.apache.org/licenses/LICENSE-2.0
012:         *
013:         * Unless required by applicable law or agreed to in writing, software
014:         * distributed under the License is distributed on an "AS IS" BASIS,
015:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016:         * See the License for the specific language governing permissions and
017:         * limitations under the License.
018:         */
019:
020:        import java.io.IOException;
021:        import java.io.ByteArrayInputStream;
022:        import java.io.DataInputStream;
023:        import java.util.Set;
024:        import java.util.HashSet;
025:        import java.util.List;
026:        import java.util.ArrayList;
027:        import java.util.Iterator;
028:        import java.util.Collections;
029:
030:        import org.apache.lucene.store.Directory;
031:        import org.apache.lucene.store.Lock;
032:        import org.apache.lucene.store.IndexOutput;
033:        import org.apache.lucene.store.IndexInput;
034:
035:        import com.sleepycat.db.internal.DbEnv;
036:        import com.sleepycat.db.internal.Db;
037:        import com.sleepycat.db.internal.DbConstants;
038:        import com.sleepycat.db.DatabaseEntry;
039:        import com.sleepycat.db.internal.Dbc;
040:        import com.sleepycat.db.internal.DbTxn;
041:        import com.sleepycat.db.DatabaseException;
042:
043:        import com.sleepycat.db.Database;
044:        import com.sleepycat.db.Transaction;
045:        import com.sleepycat.db.DbHandleExtractor;
046:
047:        /**
048:         * A DbDirectory is a Berkeley DB 4.3 based implementation of 
049:         * {@link org.apache.lucene.store.Directory Directory}. It uses two
050:         * {@link com.sleepycat.db.internal.Db Db} database handles, one for storing file
051:         * records and another for storing file data blocks.
052:         *
053:         * @author Andi Vajda
054:         */
055:
056:        public class DbDirectory extends Directory {
057:
058:            protected Set openFiles = Collections
059:                    .synchronizedSet(new HashSet());
060:            protected Db files, blocks;
061:            protected DbTxn txn;
062:            protected int flags;
063:
064:            /**
065:             * Instantiate a DbDirectory. The same threading rules that apply to
066:             * Berkeley DB handles apply to instances of DbDirectory.
067:             *
068:             * @param txn a transaction handle that is going to be used for all db
069:             * operations done by this instance. This parameter may be
070:             * <code>null</code>.
071:             * @param files a db handle to store file records.
072:             * @param blocks a db handle to store file data blocks.
073:             * @param flags flags used for db read operations.
074:             */
075:
076:            public DbDirectory(DbTxn txn, Db files, Db blocks, int flags) {
077:                super ();
078:
079:                this .txn = txn;
080:                this .files = files;
081:                this .blocks = blocks;
082:                this .flags = flags;
083:            }
084:
085:            public DbDirectory(Transaction txn, Database files,
086:                    Database blocks, int flags) {
087:                super ();
088:
089:                this .txn = txn != null ? DbHandleExtractor.getDbTxn(txn) : null;
090:                this .files = DbHandleExtractor.getDb(files);
091:                this .blocks = DbHandleExtractor.getDb(blocks);
092:                this .flags = flags;
093:            }
094:
095:            public DbDirectory(Transaction txn, Database files, Database blocks) {
096:                this (txn, files, blocks, 0);
097:            }
098:
099:            public void close() throws IOException {
100:                flush();
101:            }
102:
103:            /**
104:             * Flush the currently open files. After they have been flushed it is
105:             * safe to commit the transaction without closing this DbDirectory
106:             * instance first.
107:             * @see #setTransaction
108:             */
109:            public void flush() throws IOException {
110:                Iterator iterator = openFiles.iterator();
111:
112:                while (iterator.hasNext())
113:                    ((IndexOutput) iterator.next()).flush();
114:            }
115:
116:            public IndexOutput createOutput(String name) throws IOException {
117:                return new DbIndexOutput(this , name, true);
118:            }
119:
120:            public void deleteFile(String name) throws IOException {
121:                new File(name).delete(this );
122:            }
123:
124:            public boolean fileExists(String name) throws IOException {
125:                return new File(name).exists(this );
126:            }
127:
128:            public long fileLength(String name) throws IOException {
129:                File file = new File(name);
130:
131:                if (file.exists(this ))
132:                    return file.getLength();
133:
134:                throw new IOException("File does not exist: " + name);
135:            }
136:
137:            public long fileModified(String name) throws IOException {
138:                File file = new File(name);
139:
140:                if (file.exists(this ))
141:                    return file.getTimeModified();
142:
143:                throw new IOException("File does not exist: " + name);
144:            }
145:
146:            public String[] list() throws IOException {
147:                Dbc cursor = null;
148:                List list = new ArrayList();
149:
150:                try {
151:                    try {
152:                        DatabaseEntry key = new DatabaseEntry(new byte[0]);
153:                        DatabaseEntry data = new DatabaseEntry((byte[]) null);
154:
155:                        data.setPartial(true);
156:
157:                        cursor = files.cursor(txn, flags);
158:
159:                        if (cursor.get(key, data, DbConstants.DB_SET_RANGE
160:                                | flags) != DbConstants.DB_NOTFOUND) {
161:                            ByteArrayInputStream buffer = new ByteArrayInputStream(
162:                                    key.getData());
163:                            DataInputStream in = new DataInputStream(buffer);
164:                            String name = in.readUTF();
165:
166:                            in.close();
167:                            list.add(name);
168:
169:                            while (cursor.get(key, data, DbConstants.DB_NEXT
170:                                    | flags) != DbConstants.DB_NOTFOUND) {
171:                                buffer = new ByteArrayInputStream(key.getData());
172:                                in = new DataInputStream(buffer);
173:                                name = in.readUTF();
174:                                in.close();
175:
176:                                list.add(name);
177:                            }
178:                        }
179:                    } finally {
180:                        if (cursor != null)
181:                            cursor.close();
182:                    }
183:                } catch (DatabaseException e) {
184:                    throw new IOException(e.getMessage());
185:                }
186:
187:                return (String[]) list.toArray(new String[list.size()]);
188:            }
189:
190:            public IndexInput openInput(String name) throws IOException {
191:                return new DbIndexInput(this , name);
192:            }
193:
194:            public Lock makeLock(String name) {
195:                return new DbLock();
196:            }
197:
198:            public void renameFile(String from, String to) throws IOException {
199:                new File(from).rename(this , to);
200:            }
201:
202:            public void touchFile(String name) throws IOException {
203:                File file = new File(name);
204:                long length = 0L;
205:
206:                if (file.exists(this ))
207:                    length = file.getLength();
208:
209:                file.modify(this , length, System.currentTimeMillis());
210:            }
211:
212:            /**
213:             * Once a transaction handle was committed it is no longer valid. In
214:             * order to continue using this DbDirectory instance after a commit, the
215:             * transaction handle has to be replaced.
216:             * @param txn the new transaction handle to use
217:             */
218:            public void setTransaction(Transaction txn) {
219:                setTransaction(txn != null ? DbHandleExtractor.getDbTxn(txn)
220:                        : null);
221:            }
222:
223:            /**
224:             * Once a transaction handle was committed it is no longer valid. In
225:             * order to continue using this DbDirectory instance after a commit, the
226:             * transaction handle has to be replaced.
227:             * @param txn the new transaction handle to use
228:             */
229:            public void setTransaction(DbTxn txn) {
230:                this.txn = txn;
231:            }
232:        }
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