Quelle Write.java Sprache: JAVA

/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/* @test
* @bug 4854354
* @summary Test vector write faster than can be read
* @library ..
*/

import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.util.*;

public class Write {

    static Random generator = new Random();

    static int testSize = 15;

    public static void main(String[] args) throws Exception {
        WriteServer sv = new WriteServer();
        sv.start();
        bufferTest(sv.port());
        if (sv.finish(8000) == 0)
            throw new Exception("Failed" );
    }

    static void bufferTest(int port) throws Exception {
        ByteBuffer[] bufs = new ByteBuffer[testSize];
        for(int i=0; i<testSize; i++) {
            String source =
                "a muchmuchmuchmuchmuchmuchmuchmuch larger buffer numbered " +
                i;
            bufs[i] = ByteBuffer.allocateDirect(source.length());
        }

        // Get a connection to the server
        InetAddress lh = InetAddress.getLocalHost();
        InetSocketAddress isa = new InetSocketAddress(lh, port);
        SocketChannel sc = SocketChannel.open();
        sc.connect(isa);
        sc.configureBlocking(false);

        // Try to overflow the socket buffer
        long total = 0;
        for (int i=0; i<100; i++) {
            long bytesWritten = sc.write(bufs);
            if (bytesWritten > 0)
                total += bytesWritten;
            for(int j=0; j<testSize; j++)
                bufs[j].rewind();
        }

        // Clean up
        sc.close();
    }

}

class WriteServer extends TestThread {

    static Random generator = new Random();

    final ServerSocketChannel ssc;

    WriteServer() throws IOException {
        super("WriteServer");
        this.ssc = ServerSocketChannel.open().bind(new InetSocketAddress(0));
    }

    int port() {
        return ssc.socket().getLocalPort();
    }

    void go() throws Exception {
        bufferTest();
    }

    void bufferTest() throws Exception {
        ByteBuffer buf = ByteBuffer.allocateDirect(5);

        // Get a connection from client
        SocketChannel sc = null;

        try {
            ssc.configureBlocking(false);

            for (;;) {
                sc = ssc.accept();
                if (sc != null)
                    break;
                Thread.sleep(50);
            }

            // I'm a slow reader...
            Thread.sleep(3000);

        } finally {
            // Clean up
            ssc.close();
            if (sc != null)
                sc.close();
        }

    }

}

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