| 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.util.ArrayList; |
| import java.io.Serializable; |
| |
| class RAMFile implements Serializable { |
| |
| private static final long serialVersionUID = 1l; |
| |
| private ArrayList buffers = new ArrayList(); |
| long length; |
| RAMDirectory directory; |
| long sizeInBytes; // Only maintained if in a directory; updates synchronized on directory |
| |
| // This is publicly modifiable via Directory.touchFile(), so direct access not supported |
| private long lastModified = System.currentTimeMillis(); |
| |
| // File used as buffer, in no RAMDirectory |
| RAMFile() {} |
| |
| RAMFile(RAMDirectory directory) { |
| this.directory = directory; |
| } |
| |
| // For non-stream access from thread that might be concurrent with writing |
| synchronized long getLength() { |
| return length; |
| } |
| |
| synchronized void setLength(long length) { |
| this.length = length; |
| } |
| |
| // For non-stream access from thread that might be concurrent with writing |
| synchronized long getLastModified() { |
| return lastModified; |
| } |
| |
| synchronized void setLastModified(long lastModified) { |
| this.lastModified = lastModified; |
| } |
| |
| final synchronized byte[] addBuffer(int size) { |
| byte[] buffer = newBuffer(size); |
| if (directory!=null) |
| synchronized (directory) { // Ensure addition of buffer and adjustment to directory size are atomic wrt directory |
| buffers.add(buffer); |
| directory.sizeInBytes += size; |
| sizeInBytes += size; |
| } |
| else |
| buffers.add(buffer); |
| return buffer; |
| } |
| |
| final synchronized byte[] getBuffer(int index) { |
| return (byte[]) buffers.get(index); |
| } |
| |
| 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. |
| */ |
| byte[] newBuffer(int size) { |
| return new byte[size]; |
| } |
| |
| // Only valid if in a directory |
| long getSizeInBytes() { |
| synchronized (directory) { |
| return sizeInBytes; |
| } |
| } |
| |
| } |