Tomcat example source code file (Shm14.java)

This example Tomcat source code file (Shm14.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

exception, filechannel, io, ioexception, ioexception, mappedbytebuffer, msgcontext, msgcontext, nio, randomaccessfile, randomaccessfile, shm, shm14, shm14, string

The Tomcat Shm14.java source code

/*
 *  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.
 */

package org.apache.jk.common;

import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

import org.apache.jk.core.Msg;
import org.apache.jk.core.MsgContext;
import org.apache.tomcat.util.IntrospectionUtils;

/** Shm implementation using JDK1.4 nio.
 *
 *
 * @author Costin Manolache
 */
public class Shm14 extends Shm {
    
    
    // Not ready yet.
    
    private static org.apache.juli.logging.Log log=
        org.apache.juli.logging.LogFactory.getLog( Shm14.class );
    
    MappedByteBuffer bb;

    public void init() {
        try {
            RandomAccessFile f=new RandomAccessFile( file, "rw" );
            FileChannel fc=f.getChannel();
            
            bb=fc.map( FileChannel.MapMode.READ_WRITE, 0, f.length());
        } catch( IOException ex ) {
            ex.printStackTrace();
        }
    }

    public void dumpScoreboard(String file) {
        // We can only sync with our backing store.
        bb.force();
        // XXX we should copy the content to the file
    }

    public void resetScoreboard() throws IOException {
        // XXX Need to write the head
    }


    public  int invoke(Msg msg, MsgContext ep )
        throws IOException
    {
        if (log.isDebugEnabled())
            log.debug("ChannelShm14.invoke: "  + ep );

        // 
        
        return 0;
    }    

    public void initCli() {
    }

    public static void main( String args[] ) {
        try {
            Shm14 shm=new Shm14();

            if( args.length == 0 ||
                ( "-?".equals(args[0]) ) ) {
                shm.setHelp( true );
                return;
            }

            IntrospectionUtils.processArgs( shm, args);
            shm.execute();
        } catch( Exception ex ) {
            ex.printStackTrace();
        }
    }

}