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Java example source code file (PerfDataEntry.java)

This example Java source code file (PerfDataEntry.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

jbytefield, jintfield, observer, perfdataentry, perfdatavariability, string, stringbuffer, u_events, u_none, us\-ascii, util, v_constant, v_variable, vmobject

The PerfDataEntry.java Java example source code

/*
 * 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.
 *
 * 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.jvm.hotspot.runtime;

import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;

public class PerfDataEntry extends VMObject {
    private static JIntField  entryLengthField;
    private static JIntField  nameOffsetField;
    private static JIntField  vectorLengthField;
    private static JByteField dataTypeField;
    private static JByteField flagsField;
    private static JByteField dataUnitsField;
    private static JByteField dataVariabilityField;
    private static JIntField  dataOffsetField;

    static {
        VM.registerVMInitializedObserver(new Observer() {
                public void update(Observable o, Object data) {
                    initialize(VM.getVM().getTypeDataBase());
                }
            });
    }

    private static synchronized void initialize(TypeDataBase db) {
        Type type = db.lookupType("PerfDataEntry");
        entryLengthField = type.getJIntField("entry_length");
        nameOffsetField = type.getJIntField("name_offset");
        vectorLengthField = type.getJIntField("vector_length");
        dataTypeField = type.getJByteField("data_type");
        flagsField = type.getJByteField("flags");
        dataUnitsField = type.getJByteField("data_units");
        dataVariabilityField = type.getJByteField("data_variability");
        dataOffsetField = type.getJIntField("data_offset");
    }

    public PerfDataEntry(Address addr) {
        super(addr);
    }

    // Accessors

    public int entryLength() {
        return (int) entryLengthField.getValue(addr);
    }

    public int nameOffset() {
        return (int) nameOffsetField.getValue(addr);
    }

    public int vectorLength() {
        return (int) vectorLengthField.getValue(addr);
    }

    // returns one of the constants in BasicType class
    public int dataType() {
        char ch = (char) (byte) dataTypeField.getValue(addr);
        return BasicType.charToType(ch);
    }

    public byte flags() {
        return (byte) flagsField.getValue(addr);
    }

    public boolean supported() {
        return (flags() & 0x1) != 0;
    }

    // NOTE: Keep this in sync with PerfData::Units enum in VM code
    public interface PerfDataUnits {
        public static final int U_None   = 1;
        public static final int U_Bytes  = 2;
        public static final int U_Ticks  = 3;
        public static final int U_Events = 4;
        public static final int U_String = 5;
        public static final int U_Hertz  = 6;
    }

    // returns one of the constants in PerfDataUnits
    public int dataUnits() {
        return (int) dataUnitsField.getValue(addr);
    }

    // NOTE: Keep this in sync with PerfData::Variability enum in VM code
    public interface PerfDataVariability {
        public static final int V_Constant  = 1;
        public static final int V_Monotonic = 2;
        public static final int V_Variable  = 3;
    }

    // returns one of the constants in PerfDataVariability
    public int dataVariability() {
        return (int) dataVariabilityField.getValue(addr);
    }

    public int dataOffset() {
        return (int) dataOffsetField.getValue(addr);
    }

    public String name() {
        int off = nameOffset();
        return CStringUtilities.getString(addr.addOffsetTo(off));
    }

    public boolean booleanValue() {
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(vectorLength() == 0 &&
                        dataType() == BasicType.tBoolean, "not a boolean");
        }
        return addr.getJBooleanAt(dataOffset());
    }

    public char charValue() {
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(vectorLength() == 0 &&
                        dataType() == BasicType.tChar, "not a char");
        }
        return addr.getJCharAt(dataOffset());
    }

    public byte byteValue() {
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(vectorLength() == 0 &&
                        dataType() == BasicType.tByte, "not a byte");
        }
        return addr.getJByteAt(dataOffset());

    }

    public short shortValue() {
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(vectorLength() == 0 &&
                        dataType() == BasicType.tShort, "not a short");
        }
        return addr.getJShortAt(dataOffset());
    }

    public int intValue() {
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(vectorLength() == 0 &&
                        dataType() == BasicType.tInt, "not an int");
        }
        return addr.getJIntAt(dataOffset());
    }

    public long longValue() {
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(vectorLength() == 0 &&
                        dataType() == BasicType.tLong, "not a long");
        }
        return addr.getJLongAt(dataOffset());
    }

    public float floatValue() {
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(vectorLength() == 0 &&
                        dataType() == BasicType.tFloat, "not a float");
        }
        return addr.getJFloatAt(dataOffset());
    }

    public double doubleValue() {
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(vectorLength() == 0 &&
                        dataType() == BasicType.tDouble, "not a double");
        }
        return addr.getJDoubleAt(dataOffset());
    }

    public boolean[] booleanArrayValue() {
        int len = vectorLength();
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(len > 0 &&
                        dataType() == BasicType.tBoolean, "not a boolean vector");
        }
        boolean[] res = new boolean[len];
        final int off = dataOffset();
        final long size =  getHeap().getBooleanSize();
        for (int i = 0; i < len; i++) {
            res[i] = addr.getJBooleanAt(off + i * size);
        }
        return res;
    }

    public char[] charArrayValue() {
        int len = vectorLength();
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(len > 0 &&
                        dataType() == BasicType.tChar, "not a char vector");
        }
        char[] res = new char[len];
        final int off = dataOffset();
        final long size = getHeap().getCharSize();
        for (int i = 0; i < len; i++) {
            res[i] = addr.getJCharAt(off + i * size);
        }
        return res;
    }

    public byte[] byteArrayValue() {
        int len = vectorLength();
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(len > 0 &&
                        dataType() == BasicType.tByte, "not a byte vector");
        }
        byte[] res = new byte[len];
        final int off = dataOffset();
        final long size = getHeap().getByteSize();
        for (int i = 0; i < len; i++) {
            res[i] = addr.getJByteAt(off + i * size);
        }
        return res;
    }

    public short[] shortArrayValue() {
        int len = vectorLength();
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(len > 0 &&
                        dataType() == BasicType.tShort, "not a short vector");
        }
        short[] res = new short[len];
        final int off = dataOffset();
        final long size = getHeap().getShortSize();
        for (int i = 0; i < len; i++) {
            res[i] = addr.getJShortAt(off + i * size);
        }
        return res;
    }

    public int[] intArrayValue() {
        int len = vectorLength();
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(len > 0 &&
                        dataType() == BasicType.tInt, "not an int vector");
        }
        int[] res = new int[len];
        final int off = dataOffset();
        final long size = getHeap().getIntSize();
        for (int i = 0; i < len; i++) {
            res[i] = addr.getJIntAt(off + i * size);
        }
        return res;
    }

    public long[] longArrayValue() {
        int len = vectorLength();
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(len > 0 &&
                        dataType() == BasicType.tLong, "not a long vector");
        }
        long[] res = new long[len];
        final int off = dataOffset();
        final long size = getHeap().getLongSize();
        for (int i = 0; i < len; i++) {
            res[i] = addr.getJLongAt(off + i * size);
        }
        return res;
    }

    public float[] floatArrayValue() {
        int len = vectorLength();
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(len > 0 &&
                        dataType() == BasicType.tFloat, "not a float vector");
        }
        float[] res = new float[len];
        final int off = dataOffset();
        final long size = getHeap().getFloatSize();
        for (int i = 0; i < len; i++) {
            res[i] = addr.getJFloatAt(off + i * size);
        }
        return res;
    }

    public double[] doubleArrayValue() {
        int len = vectorLength();
        if (Assert.ASSERTS_ENABLED) {
            Assert.that(len > 0 &&
                        dataType() == BasicType.tDouble, "not a double vector");
        }
        double[] res = new double[len];
        final int off = dataOffset();
        final long size = getHeap().getDoubleSize();
        for (int i = 0; i < len; i++) {
            res[i] = addr.getJDoubleAt(off + i * size);
        }
        return res;
    }

    // value as String
    public String valueAsString() {
        int dataType = dataType();
        int len = vectorLength();
        String str = null;
        if (len == 0) { // scalar
            switch (dataType) {
            case BasicType.tBoolean:
                str = Boolean.toString(booleanValue());
                break;
            case BasicType.tChar:
                str = "'" + Character.toString(charValue()) + "'";
                break;
            case BasicType.tByte:
                str = Byte.toString(byteValue());
                break;
            case BasicType.tShort:
                str = Short.toString(shortValue());
                break;
            case BasicType.tInt:
                str = Integer.toString(intValue());
                break;
            case BasicType.tLong:
                str = Long.toString(longValue());
                break;
            case BasicType.tFloat:
                str = Float.toString(floatValue());
                break;
            case BasicType.tDouble:
                str = Double.toString(doubleValue());
                break;
            default:
                str = "<unknown scalar value>";
                break;
            }
        } else { // vector
            switch (dataType) {
            case BasicType.tBoolean: {
                boolean[] res = booleanArrayValue();
                StringBuffer buf = new StringBuffer();
                buf.append('[');
                for (int i = 0; i < res.length; i++) {
                    buf.append(Boolean.toString(res[i]));
                    buf.append(", ");
                }
                buf.append(']');
                str = buf.toString();
                break;
            }

            case BasicType.tChar: {
                // char[] is returned as a String
                str = new String(charArrayValue());
                break;
            }

            case BasicType.tByte: {
                // byte[] is returned as a String
                try {
                    str = new String(byteArrayValue(), "US-ASCII");
                } catch (java.io.UnsupportedEncodingException e) {
                    str = "can't decode string : " + e.getMessage();
                }
                break;
            }

            case BasicType.tShort: {
                short[] res = shortArrayValue();
                StringBuffer buf = new StringBuffer();
                buf.append('[');
                for (int i = 0; i < res.length; i++) {
                    buf.append(Short.toString(res[i]));
                    buf.append(", ");
                }
                buf.append(']');
                str = buf.toString();
                break;
            }

            case BasicType.tInt: {
                int[] res = intArrayValue();
                StringBuffer buf = new StringBuffer();
                buf.append('[');
                for (int i = 0; i < res.length; i++) {
                    buf.append(Integer.toString(res[i]));
                    buf.append(", ");
                }
                buf.append(']');
                str = buf.toString();
                break;
            }

            case BasicType.tLong: {
                long[] res = longArrayValue();
                StringBuffer buf = new StringBuffer();
                buf.append('[');
                for (int i = 0; i < res.length; i++) {
                    buf.append(Long.toString(res[i]));
                    buf.append(", ");
                }
                buf.append(']');
                str = buf.toString();
                break;
            }

            case BasicType.tFloat: {
                float[] res = floatArrayValue();
                StringBuffer buf = new StringBuffer();
                buf.append('[');
                for (int i = 0; i < res.length; i++) {
                    buf.append(Float.toString(res[i]));
                    buf.append(", ");
                }
                buf.append(']');
                str = buf.toString();
                break;
            }

            case BasicType.tDouble: {
                double[] res = doubleArrayValue();
                StringBuffer buf = new StringBuffer();
                buf.append('[');
                for (int i = 0; i < res.length; i++) {
                    buf.append(Double.toString(res[i]));
                    buf.append(", ");
                }
                buf.append(']');
                str = buf.toString();
                break;
            }

            default:
                str = "<unknown vector value>";
                break;
            }
        }

        // add units
        switch (dataUnits()) {
        case PerfDataUnits.U_None:
            break;
        case PerfDataUnits.U_Bytes:
            str += " byte(s)";
            break;
        case PerfDataUnits.U_Ticks:
            str += " tick(s)";
            break;
        case PerfDataUnits.U_Events:
            str += " event(s)";
            break;
        case PerfDataUnits.U_String:
            break;
        case PerfDataUnits.U_Hertz:
            str += " Hz";
            break;
        }

        return str;
    }

    // -- Internals only below this point
    private ObjectHeap getHeap() {
        return VM.getVM().getObjectHeap();
    }
}

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