Showing the changes to java/pkg/sun/jvmstat/perfdata/monitor/PerfByteArrayMonitor.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,116 @@ | ||
| 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 | +} | |