117 lines
3.9 KiB
Java
117 lines
3.9 KiB
Java
/*
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* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.jvmstat.perfdata.monitor;
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import sun.jvmstat.monitor.*;
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import java.nio.ByteBuffer;
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/**
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* Class for monitoring a PerfData Byte Array instrumentation object.
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*
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* This class is provided to support the PerfStringMonitor classes.
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* Instrumentation objects of this direct type currently cannot be
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* created or monitored.
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*
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* @author Brian Doherty
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* @since 1.5
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* @see sun.jvmstat.instrument.ByteArrayInstrument
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*/
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public class PerfByteArrayMonitor extends AbstractMonitor
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implements ByteArrayMonitor {
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/**
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* The buffer containing the data for the byte array instrument.
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*/
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ByteBuffer bb;
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/**
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* Constructor to create a ByteArrayMonitor for the byte array instrument
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* represented by the data in the given buffer.
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*
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* @param name the name of the instrumentation object
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* @param u the units of measure attribute
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* @param v the variability attribute
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* @param supported support level indicator
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* @param bb the buffer containing the byte array instrument data
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* @param vectorLength the length of the vector.
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*/
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public PerfByteArrayMonitor(String name, Units u, Variability v,
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boolean supported, ByteBuffer bb,
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int vectorLength) {
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super(name, u, v, supported, vectorLength);
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this.bb = bb;
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}
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/**
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* {@inheritDoc}
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* The object returned contains a byte[] with a copy of the current
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* elements of the ByteArrayInstrument.
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*
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* @return Object - a copy of the current value of the elements of the
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* byte array instrument. The return type is guaranteed
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* to be of type byte[].
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*/
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public Object getValue() {
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return byteArrayValue();
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}
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/**
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* Get a copy of the elements of the byte array instrument.
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*
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* @return byte[] - a copy of the current value of the elements of the
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* byte array instrument.
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*/
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public byte[] byteArrayValue() {
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bb.position(0);
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byte[] b = new byte[bb.limit()];
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// copy the bytes
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bb.get(b);
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return b;
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}
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/**
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* Get the current value of an element of the byte array instrument.
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*
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* @return byte - a copy of the current value of the element at index
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* <tt>index</tt> of the byte array instrument.
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*/
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public byte byteAt(int index) {
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bb.position(index);
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return bb.get();
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}
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/**
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* Get the maximum length of the byte array for this byte array instrument.
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*
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* @return int - the maximum length of the byte array.
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*/
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public int getMaximumLength() {
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return bb.limit();
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}
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}
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