J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* @test |
| 25 | * @bug 4639943 |
| 26 | * @summary Checks that Windows behavior matches Solaris for |
| 27 | * various read/select combinations. |
| 28 | * @author kladko |
| 29 | */ |
| 30 | |
| 31 | import java.net.*; |
| 32 | import java.nio.*; |
| 33 | import java.nio.channels.*; |
| 34 | |
| 35 | public class SelectAfterRead { |
| 36 | |
| 37 | final static int TIMEOUT = 1000; |
| 38 | |
| 39 | public static void main(String[] argv) throws Exception { |
| 40 | // server: accept connection and write one byte |
| 41 | ByteServer server = new ByteServer(1); |
| 42 | server.start(); |
| 43 | InetSocketAddress isa = new InetSocketAddress( |
| 44 | InetAddress.getByName(ByteServer.LOCALHOST), ByteServer.PORT); |
| 45 | Selector sel = Selector.open(); |
| 46 | SocketChannel sc = SocketChannel.open(); |
| 47 | sc.connect(isa); |
| 48 | sc.read(ByteBuffer.allocate(1)); |
| 49 | sc.configureBlocking(false); |
| 50 | sc.register(sel, SelectionKey.OP_READ); |
| 51 | // previously on Windows select would select channel here, although there was |
| 52 | // nothing to read |
| 53 | if (sel.selectNow() != 0) |
| 54 | throw new Exception("Select returned nonzero value"); |
| 55 | sc.close(); |
| 56 | sel.close(); |
| 57 | server.exit(); |
| 58 | |
| 59 | // Now we will test a two reads combination |
| 60 | // server: accept connection and write two bytes |
| 61 | server = new ByteServer(2); |
| 62 | server.start(); |
| 63 | sc = SocketChannel.open(); |
| 64 | sc.connect(isa); |
| 65 | sc.configureBlocking(false); |
| 66 | sel = Selector.open(); |
| 67 | sc.register(sel, SelectionKey.OP_READ); |
| 68 | if (sel.select(TIMEOUT) != 1) |
| 69 | throw new Exception("One selected key expected"); |
| 70 | sel.selectedKeys().clear(); |
| 71 | // previously on Windows a channel would get selected only once |
| 72 | if (sel.selectNow() != 1) |
| 73 | throw new Exception("One selected key expected"); |
| 74 | // Previously on Windows two consequent reads would cause select() |
| 75 | // to select a channel, although there was nothing remaining to |
| 76 | // read in the channel |
| 77 | if (sc.read(ByteBuffer.allocate(1)) != 1) |
| 78 | throw new Exception("One byte expected"); |
| 79 | if (sc.read(ByteBuffer.allocate(1)) != 1) |
| 80 | throw new Exception("One byte expected"); |
| 81 | if (sel.selectNow() != 0) |
| 82 | throw new Exception("Select returned nonzero value"); |
| 83 | sc.close(); |
| 84 | sel.close(); |
| 85 | server.exit(); |
| 86 | } |
| 87 | } |