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;
/** For Lucene internal use */
public class RAMFile implements Serializable {
private static final long serialVersionUID = 1l;
protected ArrayList<byte[]> buffers = new ArrayList<byte[]>();
long length;
RAMDirectory directory;
protected long sizeInBytes;
// This is publicly modifiable via Directory.touchFile(), so direct access not supported
private long lastModified = System.currentTimeMillis();
// File used as buffer, in no RAMDirectory
protected 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;
}
// For non-stream access from thread that might be concurrent with writing
public synchronized long getLastModified() {
return lastModified;
}
protected synchronized void setLastModified(long lastModified) {
this.lastModified = lastModified;
}
protected final byte[] addBuffer(int size) {
byte[] buffer = newBuffer(size);
synchronized(this) {
buffers.add(buffer);
sizeInBytes += size;
}
if (directory != null) {
synchronized(directory) {
directory.sizeInBytes += 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];
}
public synchronized long getSizeInBytes() {
return sizeInBytes;
}
}