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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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package jdk.internal.net.rdma;

import java.io.IOException;

import java.net.ProtocolFamily;

import java.net.ServerSocket;

import java.net.Socket;

import java.net.SocketException;

import java.net.SocketImpl;

import java.net.SocketOption;

import java.net.SocketOptions;

import java.net.StandardSocketOptions;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

import jdk.net.RdmaSocketOptions;

public class RdmaSocketProvider {

    static class RdmaClientSocketImpl extends RdmaSocketImpl {

        private final Set<SocketOption<?>> options =

                Set.of(StandardSocketOptions.SO_SNDBUF,

                       StandardSocketOptions.SO_RCVBUF,

                       StandardSocketOptions.SO_REUSEADDR,

                       StandardSocketOptions.TCP_NODELAY,

                       RdmaSocketOptions.RDMA_SQSIZE,

                       RdmaSocketOptions.RDMA_RQSIZE,

                       RdmaSocketOptions.RDMA_INLINE);

        RdmaClientSocketImpl(ProtocolFamily family) {

            super(family);

        }

        @Override

        public Set<SocketOption<?>> supportedOptions() {

            return options;

        }

        @Override

        protected <T> void setOption(SocketOption<T> name, T value)

                throws IOException {

            if (!rdmaOptions.isOptionSupported(name)) {

                int opt;

                if (name == StandardSocketOptions.SO_SNDBUF) {

                    opt = SocketOptions.SO_SNDBUF;

                } else if (name == StandardSocketOptions.SO_RCVBUF) {

                    opt = SocketOptions.SO_RCVBUF;

                } else if (name == StandardSocketOptions.SO_REUSEADDR) {

                    opt = SocketOptions.SO_REUSEADDR;

                } else if (name == StandardSocketOptions.TCP_NODELAY) {

                    opt = SocketOptions.TCP_NODELAY;

                } else {

                    throw new UnsupportedOperationException(

                            "unsupported option: " + name);

                }

                setOption(opt, value);

            } else {

                rdmaOptions.setOption(fd, name, value);

            }

        }

        @SuppressWarnings("unchecked")

        @Override

        protected <T> T getOption(SocketOption<T> name) throws IOException {

            Object value;

            if (!rdmaOptions.isOptionSupported(name)) {

                int opt;

                if (name == StandardSocketOptions.SO_SNDBUF) {

                    opt = SocketOptions.SO_SNDBUF;

                } else if (name == StandardSocketOptions.SO_RCVBUF) {

                    opt = SocketOptions.SO_RCVBUF;

                } else if (name == StandardSocketOptions.SO_REUSEADDR) {

                    opt = SocketOptions.SO_REUSEADDR;

                } else if (name == StandardSocketOptions.TCP_NODELAY) {

                    opt = SocketOptions.TCP_NODELAY;

                } else {

                    throw new UnsupportedOperationException(

                            "unsupported option: " + name);

                }

                value = getOption(opt);

            } else {

                value = rdmaOptions.getOption(fd, name);

            }

            return (T) value;

        }

    }

    static class RdmaServerSocketImpl extends RdmaSocketImpl {

        private final Set<SocketOption<?>> options =

                Set.of(StandardSocketOptions.SO_RCVBUF,

                       StandardSocketOptions.SO_REUSEADDR,

                       RdmaSocketOptions.RDMA_SQSIZE,

                       RdmaSocketOptions.RDMA_RQSIZE,

                       RdmaSocketOptions.RDMA_INLINE);

        RdmaServerSocketImpl(ProtocolFamily family) {

            super(family);

        }

        @Override

        public Set<SocketOption<?>> supportedOptions() {

            return options;

        }

        @Override

        protected <T> void setOption(SocketOption<T> name, T value)

                throws IOException {

            if (!rdmaOptions.isOptionSupported(name)) {

                int opt;

                if (name == StandardSocketOptions.SO_RCVBUF) {

                    opt = SocketOptions.SO_RCVBUF;

                } else if (name == StandardSocketOptions.SO_REUSEADDR) {

                    opt = SocketOptions.SO_REUSEADDR;

                } else {

                    throw new UnsupportedOperationException(

                            "unsupported option: " + name);

                }

                setOption(opt, value);

            } else {

                rdmaOptions.setOption(fd, name, value);

            }

        }

        @SuppressWarnings("unchecked")

        @Override

        protected <T> T getOption(SocketOption<T> name) throws IOException {

            Object value;

            if (!rdmaOptions.isOptionSupported(name)) {

                int opt;

                if (name == StandardSocketOptions.SO_RCVBUF) {

                    opt = SocketOptions.SO_RCVBUF;

                } else if (name == StandardSocketOptions.SO_REUSEADDR) {

                    opt = SocketOptions.SO_REUSEADDR;

                } else {

                    throw new UnsupportedOperationException(

                            "unsupported option: " + name);

                }

                value = getOption(opt);

            } else {

                value = rdmaOptions.getOption(fd, name);

            }

            return (T) value;

         }

    }

    public static Socket openSocket(ProtocolFamily family) throws IOException {

        return new Socket(new RdmaClientSocketImpl(family)) {  };

    }

    public static ServerSocket openServerSocket(ProtocolFamily family)

            throws IOException {

        return new ServerSocket(new RdmaServerSocketImpl(family)) {

            public Socket accept() throws IOException {

                if (isClosed())

                    throw new SocketException("Socket is closed");

                if (!isBound())

                    throw new SocketException("Socket is not bound yet");

                Socket s = openSocket(family);

                implAccept(s);

                return s;

            }

        };

    }

    private RdmaSocketProvider() {}

}