net.lightbody.bmp.proxy.jetty.http.nio.ByteBufferInputStream.java Source code

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Here is the source code for net.lightbody.bmp.proxy.jetty.http.nio.ByteBufferInputStream.java

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// ========================================================================
// $Id: ByteBufferInputStream.java,v 1.5 2005/08/13 00:01:26 gregwilkins Exp $
// Copyright 2003-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed 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 net.lightbody.bmp.proxy.jetty.http.nio;

import net.lightbody.bmp.proxy.jetty.log.LogFactory;
import net.lightbody.bmp.proxy.jetty.util.LazyList;
import org.apache.commons.logging.Log;

import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.net.SocketTimeoutException;
import java.nio.ByteBuffer;

/* ------------------------------------------------------------------------------- */
/** 
 * 
 * @version $Revision: 1.5 $
 * @author gregw
 */
public class ByteBufferInputStream extends InputStream {
    private static Log log = LogFactory.getLog(ByteBufferInputStream.class);

    long _timeout = 30000;
    int _bufferSize;
    ByteBuffer _buffer;
    Object _buffers;
    Object _recycle;
    boolean _closed = false;

    /* ------------------------------------------------------------------------------- */
    /** Constructor.
     */
    public ByteBufferInputStream(int bufferSize) {
        super();
        _bufferSize = bufferSize;
    }

    /* ------------------------------------------------------------------------------- */
    /** getSoTimeout.
     * @return
     */
    public long getTimeout() {
        return _timeout;
    }

    /* ------------------------------------------------------------------------------- */
    /** setSoTimeout.
     * @param l
     */
    public void setTimeout(long l) {
        _timeout = l;
    }

    /* ------------------------------------------------------------------------------- */
    /*
     * @see java.io.InputStream#read()
     */
    public synchronized int read() throws IOException {
        if (!waitForContent())
            return -1;
        return _buffer.get();
    }

    /* ------------------------------------------------------------------------------- */
    /*
     * @see java.io.InputStream#available()
     */
    public synchronized int available() throws IOException {
        if (!waitForContent())
            return -1;
        return _buffer.remaining();
    }

    /* ------------------------------------------------------------------------------- */
    /*
     * @see java.io.InputStream#close()
     */
    public synchronized void close() throws IOException {
        _closed = true;
        this.notify();
    }

    /* ------------------------------------------------------------------------------- */
    /*
     * @see java.io.InputStream#mark(int)
     */
    public synchronized void mark(int arg0) {
        // TODO Auto-generated method stub
    }

    /* ------------------------------------------------------------------------------- */
    /*
     * @see java.io.InputStream#markSupported()
     */
    public synchronized boolean markSupported() {
        // TODO Auto-generated method stub
        return false;
    }

    /* ------------------------------------------------------------------------------- */
    /*
     * @see java.io.InputStream#read(byte[], int, int)
     */
    public synchronized int read(byte[] buf, int offset, int length) throws IOException {

        if (!waitForContent())
            return -1;

        if (length > _buffer.remaining())
            length = _buffer.remaining();

        _buffer.get(buf, offset, length);
        return length;
    }

    /* ------------------------------------------------------------------------------- */
    /*
     * @see java.io.InputStream#read(byte[])
     */
    public synchronized int read(byte[] buf) throws IOException {
        if (!waitForContent())
            return -1;
        int length = buf.length;
        if (length > _buffer.remaining())
            length = _buffer.remaining();

        _buffer.get(buf, 0, length);
        return length;
    }

    /* ------------------------------------------------------------------------------- */
    /*
     * @see java.io.InputStream#reset()
     */
    public synchronized void reset() throws IOException {
        // TODO Auto-generated method stub
        super.reset();
    }

    /* ------------------------------------------------------------------------------- */
    /**
     * @see java.io.InputStream#skip(long)
     */
    public long skip(long length) throws IOException {
        if (!waitForContent())
            return -1;
        if (length > _buffer.remaining())
            length = _buffer.remaining();
        _buffer.position((int) (_buffer.position() + length));
        return length;
    }

    /* ------------------------------------------------------------------------------- */
    public synchronized void write(ByteBuffer buffer) {
        if (buffer.hasRemaining()) {
            _buffers = LazyList.add(_buffers, buffer);
            this.notify();
        } else
            recycle(buffer);
    }

    /* ------------------------------------------------------------------------------- */
    private synchronized boolean waitForContent() throws InterruptedIOException {
        if (_buffer != null) {
            if (_buffer.hasRemaining())
                return true;

            // recycle buffer
            recycle(_buffer);
            _buffer = null;
        }

        while (!_closed && LazyList.size(_buffers) == 0) {
            try {
                this.wait(_timeout);
            } catch (InterruptedException e) {
                log.debug(e);
                throw new InterruptedIOException(e.toString());
            }
        }

        if (_closed)
            return false;

        if (LazyList.size(_buffers) == 0)
            throw new SocketTimeoutException();

        _buffer = (ByteBuffer) LazyList.get(_buffers, 0);
        _buffers = LazyList.remove(_buffers, 0);

        return true;
    }

    /* ------------------------------------------------------------------------------- */
    /** Get a buffer to write to this InputStream.
     * The buffer wll either be a new direct buffer or a recycled buffer.
     */
    public synchronized ByteBuffer getBuffer() {
        ByteBuffer buf = null;
        int s = LazyList.size(_recycle);
        if (s > 0) {
            s--;
            buf = (ByteBuffer) LazyList.get(_recycle, s);
            _recycle = LazyList.remove(_recycle, s);
            buf.clear();
        } else {
            buf = ByteBuffer.allocateDirect(_bufferSize);
        }
        return buf;
    }

    /* ------------------------------------------------------------------------------- */
    public synchronized void recycle(ByteBuffer buf) {
        _recycle = LazyList.add(_recycle, buf);
    }

    /* ------------------------------------------------------------------------------- */
    public void destroy() {
        _buffer = null;
        _buffers = null;
        _recycle = null;
    }

}