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Ice is a comprehensive RPC framework that helps you build distributed applications with minimal effort using familiar object-oriented idioms
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// **********************************************************************
//
// Copyright (c) 2003-2017 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
{
    @Override
    public java.nio.channels.ServerSocketChannel fd()
    {
        return _fd;
    }

    @Override
    public void close()
    {
        if(_fd != null)
        {
            Network.closeSocketNoThrow(_fd);
            _fd = null;
        }
    }

    @Override
    public EndpointI listen()
    {
        try
        {
            _addr = Network.doBind(_fd, _addr, _backlog);
        }
        catch(Ice.Exception ex)
        {
            _fd = null;
            throw ex;
        }
        _endpoint = _endpoint.endpoint(this);
        return _endpoint;
    }

    @Override
    public Transceiver accept()
    {
        return new TcpTransceiver(_instance, new StreamSocket(_instance, Network.doAccept(_fd)));
    }

    @Override
    public String protocol()
    {
        return _instance.protocol();
    }

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

    @Override
    public String toDetailedString()
    {
        StringBuffer s = new StringBuffer("local address = ");
        s.append(toString());

        java.util.List intfs =
            Network.getHostsForEndpointExpand(_addr.getAddress().getHostAddress(), _instance.protocolSupport(), true);
        if(!intfs.isEmpty())
        {
            s.append("\nlocal interfaces = ");
            s.append(IceUtilInternal.StringUtil.joinString(intfs, ", "));
        }
        return s.toString();
    }

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

    TcpAcceptor(TcpEndpointI endpoint, ProtocolInstance instance, String host, int port)
    {
        _endpoint = endpoint;
        _instance = instance;
        _backlog = instance.properties().getPropertyAsIntWithDefault("Ice.TCP.Backlog", 511);

        try
        {
            _fd = Network.createTcpServerSocket();
            Network.setBlock(_fd, false);
            Network.setTcpBufSize(_fd, instance);
            if(!System.getProperty("os.name").startsWith("Windows"))
            {
                //
                // Enable SO_REUSEADDR on Unix platforms to allow re-using the
                // socket even if it's in the TIME_WAIT state. On Windows,
                // this doesn't appear to be necessary and enabling
                // SO_REUSEADDR would actually not be a good thing since it
                // allows a second process to bind to an address even it's
                // already bound by another process.
                //
                // TODO: using SO_EXCLUSIVEADDRUSE on Windows would probably
                // be better but it's only supported by recent Windows
                // versions (XP SP2, Windows Server 2003).
                //
                Network.setReuseAddress(_fd, true);
            }

            _addr = Network.getAddressForServer(host, port, instance.protocolSupport(), instance.preferIPv6());
        }
        catch(RuntimeException ex)
        {
            _fd = null;
            throw ex;
        }
    }

    @Override
    protected synchronized void finalize()
        throws Throwable
    {
        try
        {
            IceUtilInternal.Assert.FinalizerAssert(_fd == null);
        }
        catch(java.lang.Exception ex)
        {
        }
        finally
        {
            super.finalize();
        }
    }

    private TcpEndpointI _endpoint;
    private ProtocolInstance _instance;
    private java.nio.channels.ServerSocketChannel _fd;
    private int _backlog;
    private java.net.InetSocketAddress _addr;
}