/*
 *  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.commons.logging.Log log=
        org.apache.commons.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();
        }
    }

}