test/java/nio/channels/ServerSocketChannel/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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 * 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 ServerSocketChannel 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 void checkOption(ServerSocketChannel ssc, SocketOption name, Object expectedValue)
        throws IOException
    {
        Object value = ssc.getOption(name);
        if (!value.equals(expectedValue))
            throw new RuntimeException("value not as expected");
    }

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

        // check supported options
        Set<SocketOption<?>> options = ssc.supportedOptions();
        boolean reuseport = options.contains(SO_REUSEPORT);
        if (!options.contains(SO_REUSEADDR))
            throw new RuntimeException("SO_REUSEADDR should be supported");
        if (!options.contains(SO_REUSEPORT) && reuseport)
            throw new RuntimeException("SO_REUSEPORT should be supported");
        if (!options.contains(SO_RCVBUF))
            throw new RuntimeException("SO_RCVBUF should be supported");

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

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

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