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