JDK 11 jdk.internal.jvmstat.jmod - Internal JVM Stat Module

JDK 11 jdk.internal.JVM Stat.jmod is the JMOD file for JDK 11 Internal Jvmstat module.

JDK 11 Internal JVM Stat module compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.internal.jvmstat.jmod.

JDK 11 Internal JVM Stat module compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 Internal JVM Stat module source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.internal.jvmstat.

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sun/jvmstat/perfdata/monitor/v1_0/PerfDataBufferPrologue.java

/*
 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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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;
    }
}

sun/jvmstat/perfdata/monitor/v1_0/PerfDataBufferPrologue.java

 

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