// **********************************************************************
//
// Copyright (c) 2003-2006 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************

package IceInternal;

class TcpAcceptor implements Acceptor
{
    public java.nio.channels.ServerSocketChannel
    fd()
    {
        return _fd;
    }

    public void
    close()
    {
        if(_traceLevels.network >= 1)
        {
            String s = "stopping to accept tcp connections at " + toString();
            _logger.trace(_traceLevels.networkCat, s);
        }

        java.nio.channels.ServerSocketChannel fd;
        java.nio.channels.Selector selector;
	synchronized(this)
	{
	    fd = _fd;
	    selector = _selector;
	    _fd = null;
	    _selector = null;
	}
        if(fd != null)
        {
            try
            {
                fd.close();
            }
            catch(java.io.IOException ex)
            {
                // Ignore.
            }
        }
	if(selector != null)
	{
	    try
	    {
		selector.close();
	    }
	    catch(java.io.IOException ex)
	    {
		// Ignore.
	    }
	}
    }

    public void
    listen()
    {
        // Nothing to do.

        if(_traceLevels.network >= 1)
        {
            String s = "accepting tcp connections at " + toString();
            _logger.trace(_traceLevels.networkCat, s);
        }
    }

    public Transceiver
    accept(int timeout)
    {
	java.nio.channels.SocketChannel fd = null;
	while(fd == null)
	{
	    try
	    {
		fd = _fd.accept();
		if(fd == null)
		{
		    if(_selector == null)
		    {
			_selector = java.nio.channels.Selector.open();
		    }

		    while(true)
		    {
			try
			{
			    java.nio.channels.SelectionKey key =
				_fd.register(_selector, java.nio.channels.SelectionKey.OP_ACCEPT);
			    if(timeout > 0)
			    {
				if(_selector.select(timeout) == 0)
				{
				    throw new Ice.TimeoutException();
				}
			    }
			    else if(timeout == 0)
			    {
				if(_selector.selectNow() == 0)
				{
				    throw new Ice.TimeoutException();
				}
			    }
			    else
			    {
				_selector.select();
			    }

			    break;
			}
			catch(java.io.IOException ex)
			{
			    if(Network.interrupted(ex))
			    {
				continue;
			    }
			    Ice.SocketException se = new Ice.SocketException();
			    se.initCause(ex);
			    throw se;
			}
		    }
		}
	    }
	    catch(java.io.IOException ex)
	    {
		if(Network.interrupted(ex))
		{
		    continue;
		}
		Ice.SocketException se = new Ice.SocketException();
		se.initCause(ex);
		throw se;
	    }
	}

	try
	{
	    java.net.Socket socket = fd.socket();
	    socket.setTcpNoDelay(true);
	    socket.setKeepAlive(true);
	}
	catch(java.io.IOException ex)
	{
	    Ice.SocketException se = new Ice.SocketException();
	    se.initCause(ex);
	    throw se;
	}

	if(!_instance.threadPerConnection())
	{
	    Network.setBlock(fd, false);
	}

        if(_traceLevels.network >= 1)
        {
            String s = "accepted tcp connection\n" + Network.fdToString(fd);
            _logger.trace(_traceLevels.networkCat, s);
        }

        return new TcpTransceiver(_instance, fd);
    }

    public void
    connectToSelf()
    {
	java.nio.channels.SocketChannel fd = Network.createTcpSocket();
	Network.setBlock(fd, false);
	Network.doConnect(fd, _addr, -1);
	Network.closeSocket(fd);
    }

    public String
    toString()
    {
        return Network.addrToString(_addr);
    }

    final boolean
    equivalent(String host, int port)
    {
        java.net.InetSocketAddress addr = Network.getAddress(host, port);
        return addr.equals(_addr);
    }

    int
    effectivePort()
    {
        return _addr.getPort();
    }

    TcpAcceptor(Instance instance, String host, int port)
    {
        _instance = instance;
        _traceLevels = instance.traceLevels();
        _logger = instance.initializationData().logger;
        _backlog = 0;

        if(_backlog <= 0)
        {
            _backlog = 5;
        }

        try
        {
            _fd = Network.createTcpServerSocket();
            Network.setBlock(_fd, false);
            _addr = new java.net.InetSocketAddress(host, port);
	    if(_traceLevels.network >= 2)
	    {
		String s = "attempting to bind to tcp socket " + toString();
		_logger.trace(_traceLevels.networkCat, s);
	    }
            _addr = Network.doBind(_fd, _addr);
        }
        catch(RuntimeException ex)
        {
            _fd = null;
            throw ex;
        }
    }

    protected synchronized void
    finalize()
        throws Throwable
    {
        IceUtil.Assert.FinalizerAssert(_fd == null);

        super.finalize();
    }

    private Instance _instance;
    private TraceLevels _traceLevels;
    private Ice.Logger _logger;
    private java.nio.channels.ServerSocketChannel _fd;
    private int _backlog;
    private java.net.InetSocketAddress _addr;
    private java.nio.channels.Selector _selector;
}