test/java/nio/channels/DatagramChannel/SocketOptionTests.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/* @test
 * @bug 4640544 8044773
 * @summary Unit test for setOption/getOption/options methods
 * @run main SocketOptionTests
 * @run main/othervm --limit-modules=java.base SocketOptionTests
 */

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

public class SocketOptionTests {

    static <T> void checkOption(DatagramChannel dc,
                                SocketOption<T> name,
                                T expectedValue)
        throws IOException
    {
        T value = dc.getOption(name);
        if (!value.equals(expectedValue))
            throw new RuntimeException("value not as expected");
    }

    public static void main(String[] args) throws IOException {
        DatagramChannel dc = DatagramChannel.open();

        // check supported options
        Set<SocketOption<?>> options = dc.supportedOptions();
        boolean reuseport = options.contains(SO_REUSEPORT);
        List<? extends SocketOption<?>> expected;
        if (reuseport) {
           expected = Arrays.asList(SO_SNDBUF, SO_RCVBUF,
                      SO_REUSEADDR, SO_REUSEPORT, SO_BROADCAST, IP_TOS, IP_MULTICAST_IF,
                      IP_MULTICAST_TTL, IP_MULTICAST_LOOP);
        } else {
           expected = Arrays.asList(SO_SNDBUF, SO_RCVBUF,
                      SO_REUSEADDR, SO_BROADCAST, IP_TOS, IP_MULTICAST_IF, IP_MULTICAST_TTL,
                      IP_MULTICAST_LOOP);
        }
        for (SocketOption opt: expected) {
            if (!options.contains(opt))
                throw new RuntimeException(opt.name() + " should be supported");
        }

        // check specified defaults
        checkOption(dc, SO_BROADCAST, false);
        checkOption(dc, IP_MULTICAST_TTL, 1);           // true on supported platforms
        checkOption(dc, IP_MULTICAST_LOOP, true);       // true on supported platforms

        // allowed to change when not bound
        dc.setOption(SO_BROADCAST, true);
        checkOption(dc, SO_BROADCAST, true);
        dc.setOption(SO_BROADCAST, false);
        checkOption(dc, SO_BROADCAST, false);
        dc.setOption(SO_SNDBUF, 128*1024);       // can't check
        dc.setOption(SO_RCVBUF, 128*1024);       // can't check
        int before, after;
        before = dc.getOption(SO_SNDBUF);
        after = dc.setOption(SO_SNDBUF, Integer.MAX_VALUE).getOption(SO_SNDBUF);
        if (after < before)
            throw new RuntimeException("setOption caused SO_SNDBUF to decrease");
        before = dc.getOption(SO_RCVBUF);
        after = dc.setOption(SO_RCVBUF, Integer.MAX_VALUE).getOption(SO_RCVBUF);
        if (after < before)
            throw new RuntimeException("setOption caused SO_RCVBUF to decrease");
        dc.setOption(SO_REUSEADDR, true);
        checkOption(dc, SO_REUSEADDR, true);
        dc.setOption(SO_REUSEADDR, false);
        checkOption(dc, SO_REUSEADDR, false);
        if (reuseport) {
            dc.setOption(SO_REUSEPORT, true);
            checkOption(dc, SO_REUSEPORT, true);
            dc.setOption(SO_REUSEPORT, false);
            checkOption(dc, SO_REUSEPORT, false);
        }
        // bind socket
        dc.bind(new InetSocketAddress(0));

        // allow to change when bound
        dc.setOption(SO_BROADCAST, true);
        checkOption(dc, SO_BROADCAST, true);
        dc.setOption(SO_BROADCAST, false);
        checkOption(dc, SO_BROADCAST, false);
        dc.setOption(IP_TOS, 0x08);     // can't check
        dc.setOption(IP_MULTICAST_TTL, 2);
        checkOption(dc, IP_MULTICAST_TTL, 2);
        dc.setOption(IP_MULTICAST_LOOP, false);
        checkOption(dc, IP_MULTICAST_LOOP, false);
        dc.setOption(IP_MULTICAST_LOOP, true);
        checkOption(dc, IP_MULTICAST_LOOP, true);


        // NullPointerException
        try {
            dc.setOption(null, "value");
            throw new RuntimeException("NullPointerException not thrown");
        } catch (NullPointerException x) {
        }
        try {
            dc.getOption(null);
            throw new RuntimeException("NullPointerException not thrown");
        } catch (NullPointerException x) {
        }

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