org.apache.jcs.auxiliary.lateral.socket.udp.LateralUDPSender.java Source code

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Here is the source code for org.apache.jcs.auxiliary.lateral.socket.udp.LateralUDPSender.java

Source

package org.apache.jcs.auxiliary.lateral.socket.udp;

/*
 * 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.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Serializable;

import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;

import org.apache.jcs.auxiliary.lateral.LateralCacheAttributes;
import org.apache.jcs.auxiliary.lateral.LateralCacheInfo;
import org.apache.jcs.auxiliary.lateral.LateralElementDescriptor;

import org.apache.jcs.auxiliary.lateral.behavior.ILateralCacheAttributes;

import org.apache.jcs.engine.CacheElement;

import org.apache.jcs.engine.behavior.ICacheElement;

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

public class LateralUDPSender {
    private final static Log log = LogFactory.getLog(LateralUDPSender.class);

    private MulticastSocket m_localSocket;
    private InetAddress m_multicastAddress;
    private int m_multicastPort;

    private ILateralCacheAttributes ilca;

    /**
     * Constructor for the LateralUDPSender object
     *
     * @param lca
     * @exception IOException
     */
    public LateralUDPSender(ILateralCacheAttributes lca) throws IOException {
        this.ilca = lca;

        try {

            m_localSocket = new MulticastSocket();

            // Remote address.
            m_multicastAddress = InetAddress.getByName(lca.getUdpMulticastAddr());
        } catch (IOException e) {
            log.error("Could not bind to multicast address " + lca.getUdpMulticastAddr(), e);

            throw e;
        }

        m_multicastPort = lca.getUdpMulticastPort();
    }

    /** Description of the Method */
    public void send(LateralElementDescriptor led) throws IOException {
        log.debug("sending LateralElementDescriptor");

        try {
            final MyByteArrayOutputStream byteStream = new MyByteArrayOutputStream();

            final ObjectOutputStream objectStream = new ObjectOutputStream(byteStream);

            objectStream.writeObject(led);
            objectStream.flush();

            final byte[] bytes = byteStream.getBytes();

            final DatagramPacket packet = new DatagramPacket(bytes, bytes.length, m_multicastAddress,
                    m_multicastPort);

            m_localSocket.send(packet);
        } catch (IOException e) {
            log.error("Error sending message", e);

            throw e;
        }
    }

    // Service Methods //
    /** Description of the Method */
    public void update(ICacheElement item, byte requesterId) throws IOException {
        LateralElementDescriptor led = new LateralElementDescriptor(item);
        led.requesterId = requesterId;
        led.command = led.UPDATE;
        send(led);
    }

    /** Description of the Method */
    public void remove(String cacheName, Serializable key) throws IOException {
        remove(cacheName, key, LateralCacheInfo.listenerId);
    }

    /** Description of the Method */
    public void remove(String cacheName, Serializable key, long requesterId) throws IOException {
        CacheElement ce = new CacheElement(cacheName, key, null);
        LateralElementDescriptor led = new LateralElementDescriptor(ce);
        led.requesterId = requesterId;
        led.command = led.REMOVE;
        send(led);
    }

    /** Description of the Method */
    public void release() throws IOException {
        // nothing needs to be done
    }

    /** Description of the Method */
    public void dispose(String cache) throws IOException {
        // nothing needs to be done
    }

    /** Description of the Method */
    public void removeAll(String cacheName) throws IOException {
        removeAll(cacheName, LateralCacheInfo.listenerId);
    }

    /** Description of the Method */
    public void removeAll(String cacheName, long requesterId) throws IOException {
        CacheElement ce = new CacheElement(cacheName, "ALL", null);
        LateralElementDescriptor led = new LateralElementDescriptor(ce);
        led.requesterId = requesterId;
        led.command = led.REMOVEALL;
        send(led);
    }

    /** Description of the Method */
    public static void main(String args[]) {
        try {
            LateralUDPSender lur = new LateralUDPSender(new LateralCacheAttributes());

            // process user input till done
            boolean notDone = true;
            String message = null;
            // wait to dispose
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            while (notDone) {
                System.out.println("enter mesage:");
                message = br.readLine();
                CacheElement ce = new CacheElement("test", "test", message);
                LateralElementDescriptor led = new LateralElementDescriptor(ce);
                lur.send(led);
            }
        } catch (Exception e) {
            System.out.println(e.toString());
        }
    }

}

/**
 * Description of the Class
 *
 * @author asmuts
 * @created January 15, 2002
 */
class MyByteArrayOutputStream extends ByteArrayOutputStream {

    /**
     * Gets the bytes attribute of the MyByteArrayOutputStream object
     *
     * @return The bytes value
     */
    public byte[] getBytes() {
        return buf;
    }
}
// end class