jdk/test/java/nio/channels/Selector/SelectAfterRead.java
author duke
Sat, 01 Dec 2007 00:00:00 +0000
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/*
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 * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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/* @test
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 * @bug 4639943
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 * @summary  Checks that Windows behavior matches Solaris for
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 *           various read/select combinations.
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 * @author kladko
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 */
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import java.net.*;
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import java.nio.*;
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import java.nio.channels.*;
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public class SelectAfterRead {
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    final static int TIMEOUT = 1000;
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    public static void main(String[] argv) throws Exception {
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        // server: accept connection and write one byte
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        ByteServer server = new ByteServer(1);
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        server.start();
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        InetSocketAddress isa = new InetSocketAddress(
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                InetAddress.getByName(ByteServer.LOCALHOST), ByteServer.PORT);
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        Selector sel = Selector.open();
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        SocketChannel sc = SocketChannel.open();
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        sc.connect(isa);
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        sc.read(ByteBuffer.allocate(1));
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        sc.configureBlocking(false);
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        sc.register(sel, SelectionKey.OP_READ);
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        // previously on Windows select would select channel here, although there was
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        // nothing to read
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        if (sel.selectNow() != 0)
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            throw new Exception("Select returned nonzero value");
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        sc.close();
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        sel.close();
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        server.exit();
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        // Now we will test a two reads combination
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        // server: accept connection and write two bytes
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        server = new ByteServer(2);
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        server.start();
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        sc = SocketChannel.open();
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        sc.connect(isa);
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        sc.configureBlocking(false);
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        sel = Selector.open();
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        sc.register(sel, SelectionKey.OP_READ);
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        if (sel.select(TIMEOUT) != 1)
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            throw new Exception("One selected key expected");
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        sel.selectedKeys().clear();
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        // previously on Windows a channel would get selected only once
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        if (sel.selectNow() != 1)
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            throw new Exception("One selected key expected");
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        // Previously on Windows two consequent reads would cause select()
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        // to select a channel, although there was nothing remaining to
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        // read in the channel
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        if (sc.read(ByteBuffer.allocate(1)) != 1)
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            throw new Exception("One byte expected");
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        if (sc.read(ByteBuffer.allocate(1)) != 1)
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            throw new Exception("One byte expected");
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        if (sel.selectNow() != 0)
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            throw new Exception("Select returned nonzero value");
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        sc.close();
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        sel.close();
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        server.exit();
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    }
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}