org.apache.lucene.store.bytebuffer.ByteBufferFile Maven / Gradle / Ivy

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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.bytebuffer;

import java.nio.ByteBuffer;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * @author kimchy (shay.banon)
 */
public class ByteBufferFile {

    private final CopyOnWriteArrayList buffers = new CopyOnWriteArrayList();
    private final ByteBufferDirectory dir;
    final int bufferSize;

    private volatile long length;
    // This is publicly modifiable via Directory.touchFile(), so direct access not supported
    private volatile long lastModified = System.currentTimeMillis();

    public ByteBufferFile(ByteBufferDirectory dir, int bufferSize) {
        this.dir = dir;
        this.bufferSize = bufferSize;
    }

    // For non-stream access from thread that might be concurrent with writing
    public long getLength() {
        return length;
    }

    protected void setLength(long length) {
        this.length = length;
    }

    // For non-stream access from thread that might be concurrent with writing
    public long getLastModified() {
        return lastModified;
    }

    protected void setLastModified(long lastModified) {
        this.lastModified = lastModified;
    }

    protected final void addBuffer(ByteBuffer buffer) {
        buffers.add(buffer);
    }

    protected final ByteBuffer getBuffer(int index) {
        return buffers.get(index);
    }

    protected final int numBuffers() {
        return buffers.size();
    }

    void clean() {
        if (buffers != null) {
            for (ByteBuffer buffer : buffers) {
                dir.releaseBuffer(buffer);
            }
            buffers.clear();
        }
    }
}