1 /* 2 * Copyright (c) 2014, 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 package org.openjdk.bench.java.net; 24 25 import java.io.IOException; 26 import java.net.InetAddress; 27 import java.net.InetSocketAddress; 28 import java.nio.ByteBuffer; 29 import java.nio.channels.ClosedChannelException; 30 import java.nio.channels.ServerSocketChannel; 31 import java.nio.channels.SocketChannel; 32 import java.util.concurrent.TimeUnit; 33 34 import org.openjdk.jmh.annotations.*; 35 36 /** 37 * Tests the overheads of I/O API. 38 * This test is known to depend heavily on network conditions and paltform. 39 */ 40 @BenchmarkMode(Mode.Throughput) 41 @OutputTimeUnit(TimeUnit.MILLISECONDS) 42 @State(Scope.Thread) 43 public class SocketChannelReadWrite { 44 45 private ServerSocketChannel ssc; 46 private SocketChannel s1, s2; 47 private ReadThread rt; 48 private ByteBuffer bb = ByteBuffer.allocate(1); 49 50 @Setup(Level.Trial) 51 public void beforeRun() throws IOException { 52 InetAddress iaddr = InetAddress.getLocalHost(); 53 54 ssc = ServerSocketChannel.open().bind(null); 55 s1 = SocketChannel.open(new InetSocketAddress(iaddr, ssc.socket().getLocalPort())); 56 s2 = ssc.accept(); 57 58 rt = new ReadThread(s2); 59 rt.start(); 60 61 bb.put((byte) 47); 62 bb.flip(); 63 } 64 65 @TearDown(Level.Trial) 66 public void afterRun() throws IOException, InterruptedException { 67 s1.close(); 68 s2.close(); 69 ssc.close(); 70 rt.join(); 71 } 72 73 @Benchmark 74 public void test() throws IOException { 75 s1.write(bb); 76 bb.flip(); 77 } 78 79 static class ReadThread extends Thread { 80 private SocketChannel sc; 81 82 public ReadThread(SocketChannel s2) { 83 this.sc = s2; 84 } 85 86 public void run() { 87 try { 88 ByteBuffer bb = ByteBuffer.allocate(1); 89 while (sc.read(bb) > 0) { 90 bb.flip(); 91 } 92 } catch (ClosedChannelException ex) { 93 // shutdown time 94 } catch (IOException e) { 95 e.printStackTrace(); 96 } 97 } 98 } 99 100 }