1 /* 2 * Copyright (c) 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* @test 25 * @bug 8232673 26 * @summary Test DatagramChannel socket adaptor with concurrent send/receive 27 */ 28 29 import java.net.DatagramPacket; 30 import java.net.DatagramSocket; 31 import java.net.InetAddress; 32 import java.net.InetSocketAddress; 33 import java.nio.channels.DatagramChannel; 34 import java.util.concurrent.ExecutorService; 35 import java.util.concurrent.Executors; 36 import java.util.concurrent.Future; 37 38 public class AdaptorConcurrentIO { 39 main(String[] args)40 public static void main(String[] args) throws Exception { 41 testConcurrentSendReceive(0); 42 testConcurrentSendReceive(60_000); 43 } 44 45 /** 46 * Starts a task that blocks in the adaptor's receive method, then invokes 47 * the adaptor's send method to send a datagram. If the adaptor were using 48 * the channel's blockingLock then send without be blocked waiting for 49 * the receive to complete. 50 */ testConcurrentSendReceive(int timeout)51 static void testConcurrentSendReceive(int timeout) throws Exception { 52 try (DatagramChannel dc = DatagramChannel.open()) { 53 InetAddress lb = InetAddress.getLoopbackAddress(); 54 dc.bind(new InetSocketAddress(lb, 0)); 55 DatagramSocket s = dc.socket(); 56 s.setSoTimeout(timeout); 57 58 ExecutorService pool = Executors.newSingleThreadExecutor(); 59 try { 60 Future<String> result = pool.submit(() -> { 61 byte[] data = new byte[100]; 62 DatagramPacket p = new DatagramPacket(data, 0, data.length); 63 s.receive(p); 64 return new String(p.getData(), p.getOffset(), p.getLength(), "UTF-8"); 65 }); 66 67 Thread.sleep(200); // give chance for thread to block 68 69 byte[] data = "hello".getBytes("UTF-8"); 70 DatagramPacket p = new DatagramPacket(data, 0, data.length); 71 p.setSocketAddress(s.getLocalSocketAddress()); 72 s.send(p); 73 74 String msg = result.get(); 75 if (!msg.equals("hello")) 76 throw new RuntimeException("Unexpected message: " + msg); 77 } finally { 78 pool.shutdown(); 79 } 80 } 81 } 82 } 83 84