+++ /dev/null
-package org.apache.lucene.store;
-
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import java.io.IOException;
-import java.io.FileNotFoundException;
-import java.io.Serializable;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.atomic.AtomicLong;
-
-import org.apache.lucene.index.IndexFileNameFilter;
-import org.apache.lucene.util.ThreadInterruptedException;
-
-/**
- * A memory-resident {@link Directory} implementation. Locking
- * implementation is by default the {@link SingleInstanceLockFactory}
- * but can be changed with {@link #setLockFactory}.
- */
-public class RAMDirectory extends Directory implements Serializable {
-
- private static final long serialVersionUID = 1l;
-
- protected final Map<String,RAMFile> fileMap = new ConcurrentHashMap<String,RAMFile>();
- protected final AtomicLong sizeInBytes = new AtomicLong();
-
- // *****
- // Lock acquisition sequence: RAMDirectory, then RAMFile
- // *****
-
- /** Constructs an empty {@link Directory}. */
- public RAMDirectory() {
- try {
- setLockFactory(new SingleInstanceLockFactory());
- } catch (IOException e) {
- // Cannot happen
- }
- }
-
- /**
- * Creates a new <code>RAMDirectory</code> instance from a different
- * <code>Directory</code> implementation. This can be used to load
- * a disk-based index into memory.
- * <P>
- * This should be used only with indices that can fit into memory.
- * <P>
- * Note that the resulting <code>RAMDirectory</code> instance is fully
- * independent from the original <code>Directory</code> (it is a
- * complete copy). Any subsequent changes to the
- * original <code>Directory</code> will not be visible in the
- * <code>RAMDirectory</code> instance.
- *
- * @param dir a <code>Directory</code> value
- * @exception IOException if an error occurs
- */
- public RAMDirectory(Directory dir) throws IOException {
- this(dir, false);
- }
-
- private RAMDirectory(Directory dir, boolean closeDir) throws IOException {
- this();
-
- IndexFileNameFilter filter = IndexFileNameFilter.getFilter();
- for (String file : dir.listAll()) {
- if (filter.accept(null, file)) {
- dir.copy(this, file, file);
- }
- }
- if (closeDir) {
- dir.close();
- }
- }
-
- @Override
- public final String[] listAll() {
- ensureOpen();
- // NOTE: fileMap.keySet().toArray(new String[0]) is broken in non Sun JDKs,
- // and the code below is resilient to map changes during the array population.
- Set<String> fileNames = fileMap.keySet();
- List<String> names = new ArrayList<String>(fileNames.size());
- for (String name : fileNames) names.add(name);
- return names.toArray(new String[names.size()]);
- }
-
- /** Returns true iff the named file exists in this directory. */
- @Override
- public final boolean fileExists(String name) {
- ensureOpen();
- return fileMap.containsKey(name);
- }
-
- /** Returns the time the named file was last modified.
- * @throws IOException if the file does not exist
- */
- @Override
- public final long fileModified(String name) throws IOException {
- ensureOpen();
- RAMFile file = fileMap.get(name);
- if (file == null) {
- throw new FileNotFoundException(name);
- }
- return file.getLastModified();
- }
-
- /** Set the modified time of an existing file to now.
- * @throws IOException if the file does not exist
- * @deprecated Lucene never uses this API; it will be
- * removed in 4.0. */
- @Override
- @Deprecated
- public void touchFile(String name) throws IOException {
- ensureOpen();
- RAMFile file = fileMap.get(name);
- if (file == null) {
- throw new FileNotFoundException(name);
- }
-
- long ts2, ts1 = System.currentTimeMillis();
- do {
- try {
- Thread.sleep(0, 1);
- } catch (InterruptedException ie) {
- throw new ThreadInterruptedException(ie);
- }
- ts2 = System.currentTimeMillis();
- } while(ts1 == ts2);
-
- file.setLastModified(ts2);
- }
-
- /** Returns the length in bytes of a file in the directory.
- * @throws IOException if the file does not exist
- */
- @Override
- public final long fileLength(String name) throws IOException {
- ensureOpen();
- RAMFile file = fileMap.get(name);
- if (file == null) {
- throw new FileNotFoundException(name);
- }
- return file.getLength();
- }
-
- /**
- * Return total size in bytes of all files in this directory. This is
- * currently quantized to RAMOutputStream.BUFFER_SIZE.
- */
- public final long sizeInBytes() {
- ensureOpen();
- return sizeInBytes.get();
- }
-
- /** Removes an existing file in the directory.
- * @throws IOException if the file does not exist
- */
- @Override
- public void deleteFile(String name) throws IOException {
- ensureOpen();
- RAMFile file = fileMap.remove(name);
- if (file != null) {
- file.directory = null;
- sizeInBytes.addAndGet(-file.sizeInBytes);
- } else {
- throw new FileNotFoundException(name);
- }
- }
-
- /** Creates a new, empty file in the directory with the given name. Returns a stream writing this file. */
- @Override
- public IndexOutput createOutput(String name) throws IOException {
- ensureOpen();
- RAMFile file = newRAMFile();
- RAMFile existing = fileMap.remove(name);
- if (existing != null) {
- sizeInBytes.addAndGet(-existing.sizeInBytes);
- existing.directory = null;
- }
- fileMap.put(name, file);
- return new RAMOutputStream(file);
- }
-
- /**
- * Returns a new {@link RAMFile} for storing data. This method can be
- * overridden to return different {@link RAMFile} impls, that e.g. override
- * {@link RAMFile#newBuffer(int)}.
- */
- protected RAMFile newRAMFile() {
- return new RAMFile(this);
- }
-
- /** Returns a stream reading an existing file. */
- @Override
- public IndexInput openInput(String name) throws IOException {
- ensureOpen();
- RAMFile file = fileMap.get(name);
- if (file == null) {
- throw new FileNotFoundException(name);
- }
- return new RAMInputStream(file);
- }
-
- /** Closes the store to future operations, releasing associated memory. */
- @Override
- public void close() {
- isOpen = false;
- fileMap.clear();
- }
-}
fnp / pylucene.git / blobdiff