| /* |
| * 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. |
| */ |
| package org.apache.lucene.store; |
| |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| |
| import org.apache.lucene.util.Accountable; |
| |
| /** |
| * Represents a file in RAM as a list of byte[] buffers. |
| * |
| * @lucene.internal |
| * @deprecated This class uses inefficient synchronization and is discouraged |
| * in favor of {@link MMapDirectory}. It will be removed in future versions |
| * of Lucene. |
| */ |
| @Deprecated |
| public class RAMFile implements Accountable { |
| protected final ArrayList<byte[]> buffers = new ArrayList<>(); |
| long length; |
| RAMDirectory directory; |
| protected long sizeInBytes; |
| |
| // File used as buffer, in no RAMDirectory |
| public RAMFile() {} |
| |
| RAMFile(RAMDirectory directory) { |
| this.directory = directory; |
| } |
| |
| // For non-stream access from thread that might be concurrent with writing |
| public synchronized long getLength() { |
| return length; |
| } |
| |
| protected synchronized void setLength(long length) { |
| this.length = length; |
| } |
| |
| protected final byte[] addBuffer(int size) { |
| byte[] buffer = newBuffer(size); |
| synchronized(this) { |
| buffers.add(buffer); |
| sizeInBytes += size; |
| } |
| |
| if (directory != null) { |
| directory.sizeInBytes.getAndAdd(size); |
| } |
| return buffer; |
| } |
| |
| protected final synchronized byte[] getBuffer(int index) { |
| return buffers.get(index); |
| } |
| |
| protected final synchronized int numBuffers() { |
| return buffers.size(); |
| } |
| |
| /** |
| * Expert: allocate a new buffer. |
| * Subclasses can allocate differently. |
| * @param size size of allocated buffer. |
| * @return allocated buffer. |
| */ |
| protected byte[] newBuffer(int size) { |
| return new byte[size]; |
| } |
| |
| @Override |
| public synchronized long ramBytesUsed() { |
| return sizeInBytes; |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getSimpleName() + "(length=" + length + ")"; |
| } |
| |
| @Override |
| public int hashCode() { |
| int h = (int) (length ^ (length >>> 32)); |
| for (byte[] block : buffers) { |
| h = 31 * h + Arrays.hashCode(block); |
| } |
| return h; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) return true; |
| if (obj == null) return false; |
| if (getClass() != obj.getClass()) return false; |
| RAMFile other = (RAMFile) obj; |
| if (length != other.length) return false; |
| if (buffers.size() != other.buffers.size()) { |
| return false; |
| } |
| for (int i = 0; i < buffers.size(); i++) { |
| if (!Arrays.equals(buffers.get(i), other.buffers.get(i))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |