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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 PerfData Byte Array instrumentation object. | ||
| 33 | * | ||
| 34 | * This class is provided to support the PerfStringMonitor classes. | ||
| 35 | * Instrumentation objects of this direct type currently cannot be | ||
| 36 | * created or monitored. | ||
| 37 | * | ||
| 38 | * @author Brian Doherty | ||
| 39 | * @since 1.5 | ||
| 40 | * @see sun.jvmstat.instrument.ByteArrayInstrument | ||
| 41 | */ | ||
| 42 | public class PerfByteArrayMonitor extends AbstractMonitor | ||
| 43 | implements ByteArrayMonitor { | ||
| 44 | |||
| 45 | /** | ||
| 46 | * The buffer containing the data for the byte array instrument. | ||
| 47 | */ | ||
| 48 | ByteBuffer bb; | ||
| 49 | |||
| 50 | /** | ||
| 51 | * Constructor to create a ByteArrayMonitor for the byte array instrument | ||
| 52 | * represented by the data in the given buffer. | ||
| 53 | * | ||
| 54 | * @param name the name of the instrumentation object | ||
| 55 | * @param u the units of measure attribute | ||
| 56 | * @param v the variability attribute | ||
| 57 | * @param supported support level indicator | ||
| 58 | * @param bb the buffer containing the byte array instrument data | ||
| 59 | * @param vectorLength the length of the vector. | ||
| 60 | */ | ||
| 61 | public PerfByteArrayMonitor(String name, Units u, Variability v, | ||
| 62 | boolean supported, ByteBuffer bb, | ||
| 63 | int vectorLength) { | ||
| 64 | super(name, u, v, supported, vectorLength); | ||
| 65 | this.bb = bb; | ||
| 66 | } | ||
| 67 | |||
| 68 | /** | ||
| 69 | * {@inheritDoc} | ||
| 70 | * The object returned contains a byte[] with a copy of the current | ||
| 71 | * elements of the ByteArrayInstrument. | ||
| 72 | * | ||
| 73 | * @return Object - a copy of the current value of the elements of the | ||
| 74 | * byte array instrument. The return type is guaranteed | ||
| 75 | * to be of type byte[]. | ||
| 76 | */ | ||
| 77 | public Object getValue() { | ||
| 78 | return byteArrayValue(); | ||
| 79 | } | ||
| 80 | |||
| 81 | /** | ||
| 82 | * Get a copy of the elements of the byte array instrument. | ||
| 83 | * | ||
| 84 | * @return byte[] - a copy of the current value of the elements of the | ||
| 85 | * byte array instrument. | ||
| 86 | */ | ||
| 87 | public byte[] byteArrayValue() { | ||
| 88 | bb.position(0); | ||
| 89 | byte[] b = new byte[bb.limit()]; | ||
| 90 | |||
| 91 | // copy the bytes | ||
| 92 | bb.get(b); | ||
| 93 | |||
| 94 | return b; | ||
| 95 | } | ||
| 96 | |||
| 97 | /** | ||
| 98 | * Get the current value of an element of the byte array instrument. | ||
| 99 | * | ||
| 100 | * @return byte - a copy of the current value of the element at index | ||
| 101 | * <tt>index</tt> of the byte array instrument. | ||
| 102 | */ | ||
| 103 | public byte byteAt(int index) { | ||
| 104 | bb.position(index); | ||
| 105 | return bb.get(); | ||
| 106 | } | ||
| 107 | |||
| 108 | /** | ||
| 109 | * Get the maximum length of the byte array for this byte array instrument. | ||
| 110 | * | ||
| 111 | * @return int - the maximum length of the byte array. | ||
| 112 | */ | ||
| 113 | public int getMaximumLength() { | ||
| 114 | return bb.limit(); | ||
| 115 | } | ||
| 116 | } | ||