Source Code Cross Referenced for RAMDirectory.java in  » Net » lucene-connector » org » apache » lucene » store » 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 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.lucene.store;
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.FileNotFoundException;
022:        import java.io.File;
023:        import java.io.Serializable;
024:        import java.util.HashMap;
025:        import java.util.Iterator;
026:        import java.util.Set;
027:
028:        /**
029:         * A memory-resident {@link Directory} implementation.  Locking
030:         * implementation is by default the {@link SingleInstanceLockFactory}
031:         * but can be changed with {@link #setLockFactory}.
032:         *
033:         * @version $Id: RAMDirectory.java 581625 2007-10-03 15:24:12Z mikemccand $
034:         */
035:        public class RAMDirectory extends Directory implements  Serializable {
036:
037:            private static final long serialVersionUID = 1l;
038:
039:            HashMap fileMap = new HashMap();
040:            long sizeInBytes = 0;
041:
042:            // *****
043:            // Lock acquisition sequence:  RAMDirectory, then RAMFile
044:            // *****
045:
046:            /** Constructs an empty {@link Directory}. */
047:            public RAMDirectory() {
048:                setLockFactory(new SingleInstanceLockFactory());
049:            }
050:
051:            /**
052:             * Creates a new <code>RAMDirectory</code> instance from a different
053:             * <code>Directory</code> implementation.  This can be used to load
054:             * a disk-based index into memory.
055:             * <P>
056:             * This should be used only with indices that can fit into memory.
057:             * <P>
058:             * Note that the resulting <code>RAMDirectory</code> instance is fully
059:             * independent from the original <code>Directory</code> (it is a
060:             * complete copy).  Any subsequent changes to the
061:             * original <code>Directory</code> will not be visible in the
062:             * <code>RAMDirectory</code> instance.
063:             *
064:             * @param dir a <code>Directory</code> value
065:             * @exception IOException if an error occurs
066:             */
067:            public RAMDirectory(Directory dir) throws IOException {
068:                this (dir, false);
069:            }
070:
071:            private RAMDirectory(Directory dir, boolean closeDir)
072:                    throws IOException {
073:                this ();
074:                Directory.copy(dir, this , closeDir);
075:            }
076:
077:            /**
078:             * Creates a new <code>RAMDirectory</code> instance from the {@link FSDirectory}.
079:             *
080:             * @param dir a <code>File</code> specifying the index directory
081:             *
082:             * @see #RAMDirectory(Directory)
083:             */
084:            public RAMDirectory(File dir) throws IOException {
085:                this (FSDirectory.getDirectory(dir), true);
086:            }
087:
088:            /**
089:             * Creates a new <code>RAMDirectory</code> instance from the {@link FSDirectory}.
090:             *
091:             * @param dir a <code>String</code> specifying the full index directory path
092:             *
093:             * @see #RAMDirectory(Directory)
094:             */
095:            public RAMDirectory(String dir) throws IOException {
096:                this (FSDirectory.getDirectory(dir), true);
097:            }
098:
099:            /** Returns an array of strings, one for each file in the directory. */
100:            public synchronized final String[] list() {
101:                ensureOpen();
102:                Set fileNames = fileMap.keySet();
103:                String[] result = new String[fileNames.size()];
104:                int i = 0;
105:                Iterator it = fileNames.iterator();
106:                while (it.hasNext())
107:                    result[i++] = (String) it.next();
108:                return result;
109:            }
110:
111:            /** Returns true iff the named file exists in this directory. */
112:            public final boolean fileExists(String name) {
113:                ensureOpen();
114:                RAMFile file;
115:                synchronized (this ) {
116:                    file = (RAMFile) fileMap.get(name);
117:                }
118:                return file != null;
119:            }
120:
121:            /** Returns the time the named file was last modified.
122:             * @throws IOException if the file does not exist
123:             */
124:            public final long fileModified(String name) throws IOException {
125:                ensureOpen();
126:                RAMFile file;
127:                synchronized (this ) {
128:                    file = (RAMFile) fileMap.get(name);
129:                }
130:                if (file == null)
131:                    throw new FileNotFoundException(name);
132:                return file.getLastModified();
133:            }
134:
135:            /** Set the modified time of an existing file to now.
136:             * @throws IOException if the file does not exist
137:             */
138:            public void touchFile(String name) throws IOException {
139:                ensureOpen();
140:                RAMFile file;
141:                synchronized (this ) {
142:                    file = (RAMFile) fileMap.get(name);
143:                }
144:                if (file == null)
145:                    throw new FileNotFoundException(name);
146:
147:                long ts2, ts1 = System.currentTimeMillis();
148:                do {
149:                    try {
150:                        Thread.sleep(0, 1);
151:                    } catch (InterruptedException e) {
152:                    }
153:                    ts2 = System.currentTimeMillis();
154:                } while (ts1 == ts2);
155:
156:                file.setLastModified(ts2);
157:            }
158:
159:            /** Returns the length in bytes of a file in the directory.
160:             * @throws IOException if the file does not exist
161:             */
162:            public final long fileLength(String name) throws IOException {
163:                ensureOpen();
164:                RAMFile file;
165:                synchronized (this ) {
166:                    file = (RAMFile) fileMap.get(name);
167:                }
168:                if (file == null)
169:                    throw new FileNotFoundException(name);
170:                return file.getLength();
171:            }
172:
173:            /** Return total size in bytes of all files in this
174:             * directory.  This is currently quantized to
175:             * RAMOutputStream.BUFFER_SIZE. */
176:            public synchronized final long sizeInBytes() {
177:                ensureOpen();
178:                return sizeInBytes;
179:            }
180:
181:            /** Removes an existing file in the directory.
182:             * @throws IOException if the file does not exist
183:             */
184:            public synchronized void deleteFile(String name) throws IOException {
185:                ensureOpen();
186:                RAMFile file = (RAMFile) fileMap.get(name);
187:                if (file != null) {
188:                    fileMap.remove(name);
189:                    file.directory = null;
190:                    sizeInBytes -= file.sizeInBytes; // updates to RAMFile.sizeInBytes synchronized on directory
191:                } else
192:                    throw new FileNotFoundException(name);
193:            }
194:
195:            /** Renames an existing file in the directory.
196:             * @throws FileNotFoundException if from does not exist
197:             * @deprecated
198:             */
199:            public synchronized final void renameFile(String from, String to)
200:                    throws IOException {
201:                ensureOpen();
202:                RAMFile fromFile = (RAMFile) fileMap.get(from);
203:                if (fromFile == null)
204:                    throw new FileNotFoundException(from);
205:                RAMFile toFile = (RAMFile) fileMap.get(to);
206:                if (toFile != null) {
207:                    sizeInBytes -= toFile.sizeInBytes; // updates to RAMFile.sizeInBytes synchronized on directory
208:                    toFile.directory = null;
209:                }
210:                fileMap.remove(from);
211:                fileMap.put(to, fromFile);
212:            }
213:
214:            /** Creates a new, empty file in the directory with the given name. Returns a stream writing this file. */
215:            public IndexOutput createOutput(String name) throws IOException {
216:                ensureOpen();
217:                RAMFile file = new RAMFile(this );
218:                synchronized (this ) {
219:                    RAMFile existing = (RAMFile) fileMap.get(name);
220:                    if (existing != null) {
221:                        sizeInBytes -= existing.sizeInBytes;
222:                        existing.directory = null;
223:                    }
224:                    fileMap.put(name, file);
225:                }
226:                return new RAMOutputStream(file);
227:            }
228:
229:            /** Returns a stream reading an existing file. */
230:            public IndexInput openInput(String name) throws IOException {
231:                ensureOpen();
232:                RAMFile file;
233:                synchronized (this ) {
234:                    file = (RAMFile) fileMap.get(name);
235:                }
236:                if (file == null)
237:                    throw new FileNotFoundException(name);
238:                return new RAMInputStream(file);
239:            }
240:
241:            /** Closes the store to future operations, releasing associated memory. */
242:            public void close() {
243:                fileMap = null;
244:            }
245:
246:            /**
247:             * @throws AlreadyClosedException if this IndexReader is closed
248:             */
249:            protected final void ensureOpen() throws AlreadyClosedException {
250:                if (fileMap == null) {
251:                    throw new AlreadyClosedException(
252:                            "this RAMDirectory is closed");
253:                }
254:            }
255:        }
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