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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/* @test
 * @bug 8195160
 * @summary Unit test to check SocketChannel setOption/getOption/options
 *          methods.
 * @requires !vm.graal.enabled
 * @requires (os.family == "linux")
 * @library ..
 * @build RsocketTest
 * @run main/othervm -Djava.net.preferIPv4Stack=true SocketOptionTests
 */

import java.nio.channels.*;
import java.net.*;
import java.io.IOException;
import java.util.*;
import jdk.net.Sockets;
import static java.net.StandardSocketOptions.*;
import static jdk.net.RdmaSocketOptions.*;

public class SocketOptionTests {

    static void checkOption(SocketChannel sc, SocketOption name, Object expectedValue)
        throws IOException
    {
        Object value = sc.getOption(name);
        if (!value.equals(expectedValue))
            throw new RuntimeException("value not as expected");
    }

    public static void main(String[] args) throws IOException {
        if (!RsocketTest.isRsocketAvailable())
            return;

        SocketChannel sc = Sockets.openRdmaSocketChannel();

        // check supported options
        Set<SocketOption<?>> options = sc.supportedOptions();

        List<? extends SocketOption> rdmaOptions = List.of(RDMA_SQSIZE,
                RDMA_RQSIZE, RDMA_INLINE);
        List<? extends SocketOption> expected;
        expected = Arrays.asList(SO_SNDBUF, SO_RCVBUF, SO_REUSEADDR,
                    TCP_NODELAY, RDMA_SQSIZE, RDMA_RQSIZE, RDMA_INLINE);
        for (SocketOption opt: expected) {
            if (!options.contains(opt))
                throw new RuntimeException(opt.name() + " should be supported");
        }

        // check specified defaults
        checkOption(sc, TCP_NODELAY, false);

        // allowed to change when not bound
        sc.setOption(SO_SNDBUF, 128*1024);      // can't check
        sc.setOption(SO_RCVBUF, 256*1024);      // can't check
        int before, after;
        before = sc.getOption(SO_SNDBUF);
        after = sc.setOption(SO_SNDBUF, Integer.MAX_VALUE).getOption(SO_SNDBUF);
        if (after < before)
            throw new RuntimeException("setOption caused SO_SNDBUF to decrease");
        before = sc.getOption(SO_RCVBUF);
        after = sc.setOption(SO_RCVBUF, Integer.MAX_VALUE).getOption(SO_RCVBUF);
        if (after < before)
            throw new RuntimeException("setOption caused SO_RCVBUF to decrease");
        sc.setOption(SO_REUSEADDR, true);
        checkOption(sc, SO_REUSEADDR, true);
        sc.setOption(SO_REUSEADDR, false);
        checkOption(sc, SO_REUSEADDR, false);
        sc.setOption(TCP_NODELAY, true);
        checkOption(sc, TCP_NODELAY, true);
        sc.setOption(TCP_NODELAY, false);       // can't check

        sc.setOption(RDMA_SQSIZE, 1024);
        checkOption(sc, RDMA_SQSIZE, 1024);

        sc.setOption(RDMA_RQSIZE, 1024);
        checkOption(sc, RDMA_RQSIZE, 1024);

        sc.setOption(RDMA_INLINE, 512);
        checkOption(sc, RDMA_INLINE, 512);
        
        // bind socket
        sc.bind(new InetSocketAddress(0));

        sc.setOption(TCP_NODELAY, true);        // can't check
        sc.setOption(TCP_NODELAY, false);       // can't check
        // NullPointerException
        try {
            sc.setOption(null, "value");
            throw new RuntimeException("NullPointerException not thrown");
        } catch (NullPointerException x) {
        }
        try {
            sc.getOption(null);
            throw new RuntimeException("NullPointerException not thrown");
        } catch (NullPointerException x) {
        }

        // ClosedChannelException
        sc.close();
        try {
            sc.setOption(TCP_NODELAY, true);
            throw new RuntimeException("ClosedChannelException not thrown");
        } catch (ClosedChannelException x) {
        }
    }
}