org.apache.jcs.auxiliary.lateral.http.remove.DeleteLateralCacheUnicaster.java Source code

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Here is the source code for org.apache.jcs.auxiliary.lateral.http.remove.DeleteLateralCacheUnicaster.java

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

/*
 * 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.OutputStream;

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

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

import org.apache.jcs.utils.threads.IThreadPoolRunnable;

/**
 * Used to uni-cast a ICacheItem to the named cache on the target server.
 */
public class DeleteLateralCacheUnicaster implements IThreadPoolRunnable {
    private final static Log log = LogFactory.getLog(DeleteLateralCacheUnicaster.class);

    private final String hashtableName;
    private final String key;

    private String urlStr;

    private URLConnection conn;

    /**
     * Constructs with the given ICacheItem and the url of the target server.
     *
     * @param hashtableName
     * @param key
     * @param urlStr
     */
    public DeleteLateralCacheUnicaster(String hashtableName, String key, String urlStr) {

        this.hashtableName = hashtableName;
        this.key = key;

        this.urlStr = urlStr;

        log.debug("In DeleteLateralCacheUnicaster, " + Thread.currentThread().getName());
    }

    /**
     * Called when this object is first loaded in the thread pool. Important:
     * all workers in a pool must be of the same type, otherwise the mechanism
     * becomes more complex.
     *
     * @return The initData value
     */
    public Object[] getInitData() {
        return null;
    }

    /**
     * Sends a ICacheItem to the target server. This method will be executed in
     * one of the pool's threads. The thread will be returned to the pool.
     */
    // Todo: error recovery and retry.
    public void runIt(Object thData[]) {
        long start = System.currentTimeMillis();

        try {

            if (!urlStr.startsWith("http://")) {
                urlStr = "http://" + urlStr;
            }
            urlStr = urlStr + "?hashtableName=" + hashtableName + "&key=" + key;
            log.debug("urlStr = " + urlStr);

            callClearCache(urlStr);

        } catch (Exception e) {
            log.error(e);
        }

        if (log.isDebugEnabled()) {
            log.debug("delete took " + String.valueOf(System.currentTimeMillis() - start) + " millis\n");
        }

        return;
    }

    /** Description of the Method */
    public void callClearCache(String ccServletURL) {
        URL clear;
        URLConnection clearCon;
        InputStream in;
        OutputStream out;
        try {
            clear = new URL(ccServletURL);
            clearCon = clear.openConnection();
            clearCon.setDoOutput(true);
            clearCon.setDoInput(true);
            //clearCon.connect();
            out = clearCon.getOutputStream();
            in = clearCon.getInputStream();
            int cur = in.read();
            while (cur != -1) {
                cur = in.read();
            }
            out.close();
            in.close();
            // System.out.println("closed inputstream" );
        } catch (Exception e) {
            log.error(e);
        } finally {
            //in.close();
            out = null;
            in = null;
            clearCon = null;
            clear = null;
            log.info("called clear cache for " + ccServletURL);
            return;
        }
    }
}