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| 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 | } | ||