/* * Copyright (c) 2004, 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.v1_0;import sun.jvmstat.monitor.*;import sun.jvmstat.perfdata.monitor.*;import java.nio.*;/** * Class representing the 1.0 version of the HotSpot PerfData instrumentation * buffer header. * <p> * The PerfDataBufferPrologue2_0 class supports parsing of the version * specific portions of the PerfDataPrologue C structure: * <pre> * typedef struct { * ... // handled by superclass * jint used; // number of PerfData memory bytes used * jint overflow; // number of bytes of overflow * jlong mod_time_stamp; // time stamp of the last structural modification * } PerfDataPrologue * </pre> * * @author Brian Doherty * @since 1.5 */public class PerfDataBufferPrologue extends AbstractPerfDataBufferPrologue { private static final int SUPPORTED_MAJOR_VERSION = 1; private static final int SUPPORTED_MINOR_VERSION = 0; /* * the following constants must match the field offsets and sizes * in the PerfDataPrologue structure in perfMemory.hpp */ final static int PERFDATA_PROLOG_USED_OFFSET=8; final static int PERFDATA_PROLOG_USED_SIZE=4; // sizeof(int) final static int PERFDATA_PROLOG_OVERFLOW_OFFSET=12; final static int PERFDATA_PROLOG_OVERFLOW_SIZE=4; // sizeof(int) final static int PERFDATA_PROLOG_MODTIMESTAMP_OFFSET=16; final static int PERFDATA_PROLOG_MODTIMESTAMP_SIZE=8; // sizeof(long) final static int PERFDATA_PROLOG_SIZE=24; // sizeof(struct PerfDataProlog) // counter names for prologue psuedo counters final static String PERFDATA_BUFFER_SIZE_NAME = "sun.perfdata.size"; final static String PERFDATA_BUFFER_USED_NAME = "sun.perfdata.used"; final static String PERFDATA_OVERFLOW_NAME = "sun.perfdata.overflow"; final static String PERFDATA_MODTIMESTAMP_NAME = "sun.perfdata.timestamp"; /** * Create an instance of PerfDataBufferPrologue from the given * ByteBuffer object. * * @param byteBuffer the buffer containing the binary header data */ public PerfDataBufferPrologue(ByteBuffer byteBuffer) throws MonitorException { super(byteBuffer); assert ((getMajorVersion() == 1) && (getMinorVersion() == 0)); } /** * {@inheritDoc} */ public boolean supportsAccessible() { return false; } /** * {@inheritDoc} */ public boolean isAccessible() { return true; } /** * Get the utilization of the instrumentation memory buffer. * * @return int - the utilization of the buffer */ public int getUsed() { byteBuffer.position(PERFDATA_PROLOG_USED_OFFSET); return byteBuffer.getInt(); } /** * Get the size of the instrumentation memory buffer. * * @return int - the size of the buffer */ public int getBufferSize() { return byteBuffer.capacity(); } /** * Get the buffer overflow amount. This value is non-zero if the * HotSpot JVM has overflowed the instrumentation memory buffer. * The target JVM can be restarted with -XX:PerfDataMemSize=X to * create a larger memory buffer. * * @return int - the size of the buffer */ public int getOverflow() { byteBuffer.position(PERFDATA_PROLOG_OVERFLOW_OFFSET); return byteBuffer.getInt(); } /** * Get the time of last modification for the instrumentation * memory buffer. This method returns the time, as ticks since the * start of the target JVM, of the last structural modification to * the instrumentation buffer. Structural modifications correspond to * the addition or deletion of instrumentation objects. Updates to * counter values are not structural modifications. */ public long getModificationTimeStamp() { byteBuffer.position(PERFDATA_PROLOG_MODTIMESTAMP_OFFSET); return byteBuffer.getLong(); } /** * {@inheritDoc} */ public int getSize() { return PERFDATA_PROLOG_SIZE; // sizeof(struct PerfDataProlog) } /** * Return an IntBuffer that accesses the used value. This is used * to create a Monitor object for this value. * * @return IntBuffer - a ByteBuffer that accesses the used value * in the instrumentation buffer header. * @see #getUsed() */ public IntBuffer usedBuffer() { byteBuffer.position(PERFDATA_PROLOG_USED_OFFSET); IntBuffer ib = byteBuffer.asIntBuffer(); ib.limit(1); return ib; } /** * Return an IntBuffer that accesses the size value. This is used * to create a Monitor object for this value. * * @return IntBuffer - a ByteBuffer that accesses the size value * in the instrumentation buffer header. * @see #getBufferSize() */ public IntBuffer sizeBuffer() { IntBuffer ib = IntBuffer.allocate(1); ib.put(byteBuffer.capacity()); return ib; } /** * Return an IntBuffer that accesses the overflow value. This is used * to create a Monitor object for this value. * * @return IntBuffer - a ByteBuffer that accesses the overflow value * in the instrumentation buffer header. * @see #getOverflow() */ public IntBuffer overflowBuffer() { byteBuffer.position(PERFDATA_PROLOG_OVERFLOW_OFFSET); IntBuffer ib = byteBuffer.asIntBuffer(); ib.limit(1); return ib; } /** * Return an LongBuffer that accesses the modification timestamp value. * This is used* to create a Monitor object for this value. * * @return LongBuffer - a ByteBuffer that accesses the modification time * stamp value in the instrumentation buffer header. * @see #getModificationTimeStamp() */ public LongBuffer modificationTimeStampBuffer() { byteBuffer.position(PERFDATA_PROLOG_MODTIMESTAMP_OFFSET); LongBuffer lb = byteBuffer.asLongBuffer(); lb.limit(1); return lb; }}
/*
* Copyright (c) 2004, 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.v1_0;
import sun.jvmstat.monitor.*;
import sun.jvmstat.perfdata.monitor.*;
import java.nio.*;
/**
* Class representing the 1.0 version of the HotSpot PerfData instrumentation
* buffer header.
* <p>
* The PerfDataBufferPrologue2_0 class supports parsing of the version
* specific portions of the PerfDataPrologue C structure:
* <pre>
* typedef struct {
* ... // handled by superclass
* jint used; // number of PerfData memory bytes used
* jint overflow; // number of bytes of overflow
* jlong mod_time_stamp; // time stamp of the last structural modification
* } PerfDataPrologue
* </pre>
*
* @author Brian Doherty
* @since 1.5
*/
public class PerfDataBufferPrologue extends AbstractPerfDataBufferPrologue {
private static final int SUPPORTED_MAJOR_VERSION = 1;
private static final int SUPPORTED_MINOR_VERSION = 0;
/*
* the following constants must match the field offsets and sizes
* in the PerfDataPrologue structure in perfMemory.hpp
*/
final static int PERFDATA_PROLOG_USED_OFFSET=8;
final static int PERFDATA_PROLOG_USED_SIZE=4; // sizeof(int)
final static int PERFDATA_PROLOG_OVERFLOW_OFFSET=12;
final static int PERFDATA_PROLOG_OVERFLOW_SIZE=4; // sizeof(int)
final static int PERFDATA_PROLOG_MODTIMESTAMP_OFFSET=16;
final static int PERFDATA_PROLOG_MODTIMESTAMP_SIZE=8; // sizeof(long)
final static int PERFDATA_PROLOG_SIZE=24; // sizeof(struct PerfDataProlog)
// counter names for prologue psuedo counters
final static String PERFDATA_BUFFER_SIZE_NAME = "sun.perfdata.size";
final static String PERFDATA_BUFFER_USED_NAME = "sun.perfdata.used";
final static String PERFDATA_OVERFLOW_NAME = "sun.perfdata.overflow";
final static String PERFDATA_MODTIMESTAMP_NAME = "sun.perfdata.timestamp";
/**
* Create an instance of PerfDataBufferPrologue from the given
* ByteBuffer object.
*
* @param byteBuffer the buffer containing the binary header data
*/
public PerfDataBufferPrologue(ByteBuffer byteBuffer)
throws MonitorException {
super(byteBuffer);
assert ((getMajorVersion() == 1) && (getMinorVersion() == 0));
}
/**
* {@inheritDoc}
*/
public boolean supportsAccessible() {
return false;
}
/**
* {@inheritDoc}
*/
public boolean isAccessible() {
return true;
}
/**
* Get the utilization of the instrumentation memory buffer.
*
* @return int - the utilization of the buffer
*/
public int getUsed() {
byteBuffer.position(PERFDATA_PROLOG_USED_OFFSET);
return byteBuffer.getInt();
}
/**
* Get the size of the instrumentation memory buffer.
*
* @return int - the size of the buffer
*/
public int getBufferSize() {
return byteBuffer.capacity();
}
/**
* Get the buffer overflow amount. This value is non-zero if the
* HotSpot JVM has overflowed the instrumentation memory buffer.
* The target JVM can be restarted with -XX:PerfDataMemSize=X to
* create a larger memory buffer.
*
* @return int - the size of the buffer
*/
public int getOverflow() {
byteBuffer.position(PERFDATA_PROLOG_OVERFLOW_OFFSET);
return byteBuffer.getInt();
}
/**
* Get the time of last modification for the instrumentation
* memory buffer. This method returns the time, as ticks since the
* start of the target JVM, of the last structural modification to
* the instrumentation buffer. Structural modifications correspond to
* the addition or deletion of instrumentation objects. Updates to
* counter values are not structural modifications.
*/
public long getModificationTimeStamp() {
byteBuffer.position(PERFDATA_PROLOG_MODTIMESTAMP_OFFSET);
return byteBuffer.getLong();
}
/**
* {@inheritDoc}
*/
public int getSize() {
return PERFDATA_PROLOG_SIZE; // sizeof(struct PerfDataProlog)
}
/**
* Return an IntBuffer that accesses the used value. This is used
* to create a Monitor object for this value.
*
* @return IntBuffer - a ByteBuffer that accesses the used value
* in the instrumentation buffer header.
* @see #getUsed()
*/
public IntBuffer usedBuffer() {
byteBuffer.position(PERFDATA_PROLOG_USED_OFFSET);
IntBuffer ib = byteBuffer.asIntBuffer();
ib.limit(1);
return ib;
}
/**
* Return an IntBuffer that accesses the size value. This is used
* to create a Monitor object for this value.
*
* @return IntBuffer - a ByteBuffer that accesses the size value
* in the instrumentation buffer header.
* @see #getBufferSize()
*/
public IntBuffer sizeBuffer() {
IntBuffer ib = IntBuffer.allocate(1);
ib.put(byteBuffer.capacity());
return ib;
}
/**
* Return an IntBuffer that accesses the overflow value. This is used
* to create a Monitor object for this value.
*
* @return IntBuffer - a ByteBuffer that accesses the overflow value
* in the instrumentation buffer header.
* @see #getOverflow()
*/
public IntBuffer overflowBuffer() {
byteBuffer.position(PERFDATA_PROLOG_OVERFLOW_OFFSET);
IntBuffer ib = byteBuffer.asIntBuffer();
ib.limit(1);
return ib;
}
/**
* Return an LongBuffer that accesses the modification timestamp value.
* This is used* to create a Monitor object for this value.
*
* @return LongBuffer - a ByteBuffer that accesses the modification time
* stamp value in the instrumentation buffer header.
* @see #getModificationTimeStamp()
*/
public LongBuffer modificationTimeStampBuffer() {
byteBuffer.position(PERFDATA_PROLOG_MODTIMESTAMP_OFFSET);
LongBuffer lb = byteBuffer.asLongBuffer();
lb.limit(1);
return lb;
}
}