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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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 */
package com.sun.enterprise.server.ss.provider;

import java.nio.channels.spi.*;
import java.nio.channels.*;
import java.io.*;
import java.net.*;
import java.util.*;

/**
 * Application Server's implementation of SelectorProvider, 
 * which wraps the JDK's default SelectorProvider obtained by
 * sun.nio.ch.DefaultSelectorProvider.create().
 * This wrapping is necessary to provide special implementations of
 * ServerSocketChannel and Selector.
 */
public class ASSelectorProvider extends SelectorProvider {

    public static final int PORT_UNBOUND = 0;
    public static final int PORT_BOUND = 1;
    public static final int PORT_CONFLICT = 2;
   
    private SelectorProvider provider = null;

    private HashMap<Integer, Integer> statemap = 
        new HashMap<Integer, Integer>();
    private HashMap<Integer, ServerSocket> socketmap = 
        new HashMap<Integer, ServerSocket>();

    public ASSelectorProvider() {
        provider = getProvider();
    }

    public DatagramChannel openDatagramChannel() throws IOException {
        return provider.openDatagramChannel();
    }

    public Pipe openPipe() throws IOException {
        return provider.openPipe();
    }

    public ServerSocketChannel openServerSocketChannel() throws IOException {
        ServerSocketChannel ssc = provider.openServerSocketChannel();
        return new ASServerSocketChannel(ssc, this);
    }

    public SocketChannel openSocketChannel() throws IOException {
        //SocketChannel sc = provider.openSocketChannel();
        //return new ASSocketChannel(sc, this);
        return provider.openSocketChannel();
    }

    public AbstractSelector openSelector() throws IOException {
        AbstractSelector sel =  provider.openSelector();
        return new ASSelector(sel, this);
    }


    ServerSocket getServerSocket(int port) {
        return socketmap.get(port);
    }

    int getPortState(int port) {
        Integer i = statemap.get(port);
        if (i == null) {
            return PORT_UNBOUND;
        } else {
            return i.intValue();
        }
    }

    public void setPortState(int port, int state) {
        statemap.put(port, state);
    }

    public void clear(int port) {
        statemap.remove(port);
        socketmap.remove(port);
    }


    void setServerSocket(ServerSocket ss, int port) {
        int state = getPortState(port);

	/**
        if  (state < 3)  {
            state++;
            statemap.put(s, new Integer(state));
        }
	**/

        if (state == PORT_UNBOUND) {
            socketmap.put(port, ss);
            setPortState(port, PORT_BOUND);
        }
	else if (state == PORT_BOUND) {
            setPortState(port, PORT_CONFLICT);
	}
    }

    private SelectorProvider getProvider() { 
        SelectorProvider sp = null;
        try {
            Class clazz = Class.forName( "sun.nio.ch.DefaultSelectorProvider" );
            java.lang.reflect.Method createMeth = clazz.getMethod("create", new Class[] {});
            sp = (SelectorProvider) createMeth.invoke( null, new Object[] {} ); 
        } catch( Exception e ) {
	    throw new RuntimeException("Unable to create default SelectorProvider.", e);
	}

	return sp;
    }


}