test/jdk/java/nio/channels/Pipe/SelectPipe.java

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

/* @test
 * @summary Test selection of ready pipe
 * @key randomness
 */

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.nio.channels.spi.SelectorProvider;
import java.util.Random;

/**
 * Testing PipeChannel
 */
public class SelectPipe {

    private static Random generator = new Random();

    public static void main(String[] args) throws Exception {

        SelectorProvider sp = SelectorProvider.provider();
        Selector selector = Selector.open();
        Pipe p = sp.openPipe();
        Pipe.SinkChannel sink = p.sink();
        Pipe.SourceChannel source = p.source();

        source.configureBlocking(false);
        sink.configureBlocking(false);

        SelectionKey readkey = source.register(selector, SelectionKey.OP_READ);
        SelectionKey writekey = sink.register(selector, SelectionKey.OP_WRITE);

        ByteBuffer outgoingdata = ByteBuffer.allocateDirect(10);
        byte[] someBytes = new byte[10];
        generator.nextBytes(someBytes);
        outgoingdata.put(someBytes);
        outgoingdata.flip();

        int totalWritten = 0;
        while (totalWritten < 10) {
            int written = sink.write(outgoingdata);
            if (written < 0)
                throw new Exception("Write failed");
            totalWritten += written;
        }

        if (selector.select(1000) == 0) {
            throw new Exception("test failed");
        }

        ByteBuffer incomingdata = ByteBuffer.allocateDirect(10);
        int totalRead = 0;
        do {
            int bytesRead = source.read(incomingdata);
            if (bytesRead > 0)
                totalRead += bytesRead;
        } while(totalRead < 10);

        sink.close();
        source.close();
        selector.close();

        for(int i=0; i<10; i++)
            if (outgoingdata.get(i) != incomingdata.get(i))
                throw new Exception("Pipe failed");
    }
}