com.liferay.util.transport.MulticastDatagramHandler.java Source code

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Here is the source code for com.liferay.util.transport.MulticastDatagramHandler.java

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/**
 * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.util.transport;

import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStream;
import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayOutputStream;
import com.liferay.portal.kernel.util.StringBundler;

import java.io.InputStream;

import java.net.DatagramPacket;

import java.util.zip.GZIPInputStream;

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

/**
 * @author Michael C. Han
 * @author Raymond Aug
 */
public class MulticastDatagramHandler implements DatagramHandler {

    public MulticastDatagramHandler(boolean gzipData, boolean shortData) {
        _gzipData = gzipData;
        _shortData = shortData;
    }

    public void errorReceived(Throwable t) {
        _log.error(t, t);
    }

    public void process(DatagramPacket packet) {
        byte[] bytes = packet.getData();

        if (_gzipData) {
            try {
                bytes = getUnzippedBytes(bytes);
            } catch (Exception e) {
                _log.error(e, e);
            }
        }

        if (_shortData) {
            byte[] temp = new byte[96];

            System.arraycopy(bytes, 0, temp, 0, 96);

            bytes = temp;
        }

        StringBundler sb = new StringBundler(4);

        sb.append("[");
        sb.append(packet.getSocketAddress());
        sb.append("] ");
        sb.append(new String(bytes));

        if (_log.isInfoEnabled()) {
            _log.info(sb);
        }
    }

    protected byte[] getUnzippedBytes(byte[] bytes) throws Exception {
        InputStream is = new GZIPInputStream(new UnsyncByteArrayInputStream(bytes));
        UnsyncByteArrayOutputStream ubaos = new UnsyncByteArrayOutputStream(bytes.length);

        byte[] buffer = new byte[1500];

        int c = 0;

        while (true) {
            if (c == -1) {
                break;
            }

            c = is.read(buffer, 0, 1500);

            if (c != -1) {
                ubaos.write(buffer, 0, c);
            }
        }

        is.close();

        ubaos.flush();
        ubaos.close();

        return ubaos.toByteArray();
    }

    private static Log _log = LogFactory.getLog(MulticastDatagramHandler.class);

    private boolean _gzipData;
    private boolean _shortData;

}