org.apache.jcs.auxiliary.lateral.http.broadcast.LateralCacheThread.java Source code

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Here is the source code for org.apache.jcs.auxiliary.lateral.http.broadcast.LateralCacheThread.java

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package org.apache.jcs.auxiliary.lateral.http.broadcast;

/*
 * 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.InputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;

import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

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 LateralCacheThread extends Thread {
    private final static Log log = LogFactory.getLog(LateralCacheThread.class);

    private final static String servlet = "/rcash/ramraf/DistCacheServlet";

    /** Description of the Field */
    protected String hashtableName;

    /** Description of the Field */
    protected String key;

    /** Description of the Field */
    protected Serializable val;

    /** Description of the Field */
    protected boolean running = true;

    /** Description of the Field */
    protected String[] servers;

    /**
     * Constructor for the LateralCacheThread object
     *
     * @param hashtableName
     * @param key
     * @param val
     * @param servers
     */
    public LateralCacheThread(String hashtableName, String key, Serializable val, String[] servers) {
        this.hashtableName = hashtableName;
        this.key = key;
        this.val = val;
        this.servers = servers;
    }

    /** Main processing method for the LateralCacheThread object */
    public void run() {
        try {
            long start = System.currentTimeMillis();
            //if ( running ) {
            ICacheElement cb = new CacheElement(hashtableName, key, val);
            log.debug("key = " + key);
            String result = sendCache(cb);
            sleep(100);
            running = false;
            long end = System.currentTimeMillis();
            log.info("transfer took " + String.valueOf(end - start) + " millis");

            return;
            //}
        } catch (InterruptedException e) {
            running = false;
            return;
        }

    }
    // end run

    /** Description of the Method */
    public String sendCache(ICacheElement cb) {
        String response = "";
        try {
            for (int i = 0; i < servers.length; i++) {
                if (log.isDebugEnabled()) {
                    log.debug("servers[i] + servlet = " + servers[i] + servlet);
                }
                // create our URL
                URL tmpURL = new URL(servers[i] + servlet);
                URL url = new URL(tmpURL.toExternalForm());
                if (log.isDebugEnabled()) {
                    log.debug("tmpURL = " + tmpURL);
                }

                // Open our URLConnection

                log.debug("Opening Connection.");

                URLConnection con = url.openConnection();

                if (log.isDebugEnabled()) {
                    log.debug("con = " + con);
                }

                writeObj(con, cb);
                response = read(con);

                if (log.isDebugEnabled()) {
                    log.debug("response = " + response);
                }
            }
            // end for
        } catch (MalformedURLException mue) {
            log.error(mue);
        } catch (Exception e) {
            log.error(e);
        }
        // end catch

        // suggest gc
        cb = null;
        running = false;
        return response;
    }
    // end send cache

    // Write the Answer to the Connection
    /** Description of the Method */
    public void writeObj(URLConnection connection, ICacheElement cb) {
        try {
            connection.setUseCaches(false);
            connection.setRequestProperty("CONTENT_TYPE", "application/octet-stream");
            connection.setDoOutput(true);
            connection.setDoInput(true);
            ObjectOutputStream os = new ObjectOutputStream(connection.getOutputStream());
            log.debug("os = " + os);

            // Write the ICacheItem to the ObjectOutputStream
            log.debug("Writing  ICacheItem.");

            os.writeObject(cb);
            os.flush();

            log.debug("closing output stream");

            os.close();
        } catch (IOException e) {
            log.error(e);
        }
        // end catch
    }

    /** Description of the Method */
    public String read(URLConnection connection) {
        String result = "";
        try {
            ObjectInputStream is = new ObjectInputStream(connection.getInputStream());
            result = (String) is.readObject();
            is.close();

            log.debug("got result = " + result);
        } catch (IOException e) {
            log.error(e);
        } catch (ClassNotFoundException ce) {
            log.error(ce);
        }
        return result;
    }
}