com.bah.lucene.buffer.BufferStore.java Source code

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Here is the source code for com.bah.lucene.buffer.BufferStore.java

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package com.bah.lucene.buffer;

/**
 * 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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.text.MessageFormat;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

public class BufferStore {

    public static final int _1024_DEFAULT_SIZE = 8192;
    public static final int _8192_DEFAULT_SIZE = 8192;

    private static final Log LOG = LogFactory.getLog(BufferStore.class);

    private static BlockingQueue<byte[]> _1024;
    private static BlockingQueue<byte[]> _8192;

    private volatile static boolean setup = false;

    public static void init(int _1KSize, int _8KSize) {
        if (!setup) {
            LOG.info(MessageFormat.format("Initializing the 1024 buffers with [{0}] buffers.", _1KSize));
            _1024 = setupBuffers(1024, _1KSize);
            LOG.info(MessageFormat.format("Initializing the 8192 buffers with [{0}] buffers.", _8KSize));
            _8192 = setupBuffers(8192, _8KSize);
            setup = true;
        }
    }

    private static BlockingQueue<byte[]> setupBuffers(int bufferSize, int count) {
        BlockingQueue<byte[]> queue = new ArrayBlockingQueue<byte[]>(count);
        for (int i = 0; i < count; i++) {
            queue.add(new byte[bufferSize]);
        }
        return queue;
    }

    public static byte[] takeBuffer(int bufferSize) {
        if (_1024 == null || _8192 == null) {
            init(_1024_DEFAULT_SIZE, _8192_DEFAULT_SIZE);
        }
        switch (bufferSize) {
        case 1024:
            return newBuffer1024(_1024.poll());
        case 8192:
            return newBuffer8192(_8192.poll());
        default:
            return newBuffer(bufferSize);
        }
    }

    public static void putBuffer(byte[] buffer) {
        if (buffer == null) {
            return;
        }
        int bufferSize = buffer.length;
        switch (bufferSize) {
        case 1024:
            _1024.offer(buffer);
            return;
        case 8192:
            _8192.offer(buffer);
            return;
        }
    }

    private static byte[] newBuffer1024(byte[] buf) {
        if (buf != null) {
            return buf;
        }
        return new byte[1024];
    }

    private static byte[] newBuffer8192(byte[] buf) {
        if (buf != null) {
            return buf;
        }
        return new byte[8192];
    }

    private static byte[] newBuffer(int size) {
        return new byte[size];
    }
}