1 /* 2 * Copyright (c) 2003, 2010, 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 4863423 26 * @summary Test Util caching policy 27 */ 28 29 import java.io.*; 30 import java.nio.*; 31 import java.nio.channels.*; 32 33 public class BigReadWrite { 34 35 static int testSize = 15; 36 37 public static void main(String[] args) throws Exception { 38 // One platform suffices to check for this bug 39 String osName = System.getProperty("os.name"); 40 if (!osName.startsWith("SunOS")) 41 return; 42 43 FileOutputStream fos = new FileOutputStream("/dev/zero"); 44 FileChannel fc = fos.getChannel(); 45 46 // Three small writes to fill up the Util cache 47 ByteBuffer buf = ByteBuffer.allocate(900); 48 fc.write(buf); 49 buf = ByteBuffer.allocate(950); 50 fc.write(buf); 51 buf = ByteBuffer.allocate(975); 52 fc.write(buf); 53 buf = ByteBuffer.allocate(4419000); 54 55 // Now initiate large write to create larger direct buffers 56 long iterations = 0; 57 while (iterations < 50) { 58 fc.write(buf); 59 buf.rewind(); 60 iterations++; 61 } 62 // Clean up 63 fc.close(); 64 } 65 }