1 /* 2 * Copyright (c) 2004, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.jvmstat.perfdata.monitor; 27 28 import sun.jvmstat.monitor.*; 29 import java.nio.ByteBuffer; 30 31 /** 32 * Class for monitoring a constant PerfData String instrument. The 33 * value associated with a constant string instrument is fixed at 34 * the string instrument's creation time. Its value and length never 35 * change. 36 * 37 * @author Brian Doherty 38 * @since 1.5 39 */ 40 public class PerfStringConstantMonitor extends PerfStringMonitor { 41 42 /** 43 * The cached value of the string instrument. 44 */ 45 String data; 46 47 /** 48 * Constructor to create a StringMonitor object for the constant string 49 * instrument object represented by the data in the given buffer. 50 * 51 * @param name the name of the instrumentation object 52 * @param supported support level indicator 53 * @param bb the buffer containing the string instrument data 54 */ 55 public PerfStringConstantMonitor(String name, boolean supported, 56 ByteBuffer bb) { 57 super(name, Variability.CONSTANT, supported, bb); 58 this.data = super.stringValue(); 59 } 60 61 /** 62 * {@inheritDoc} 63 */ 64 public Object getValue() { 65 return data; // return the cached string 66 } 67 68 /** 69 * {@inheritDoc} 70 */ 71 public String stringValue() { 72 return data; // return the cached string 73 } 74 }