src/java.management/share/classes/sun/management/StackTraceElementCompositeData.java
author mchung
Wed, 28 Feb 2018 17:11:57 -0800 (2018-03-01)
changeset 49077 b1c42b3cd19b
parent 47216 71c04702a3d5
child 52152 bfdf2926cebc
permissions -rw-r--r--
8198253: ThreadInfo.from(CompositeData) incorrectly accepts CompositeData with missing JDK 6 attributes Reviewed-by: dfuchs, jmanson
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/*
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 * Copyright (c) 2005, 2018, 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.management;
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import javax.management.openmbean.CompositeType;
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import javax.management.openmbean.CompositeData;
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import javax.management.openmbean.CompositeDataSupport;
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import javax.management.openmbean.OpenDataException;
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import javax.management.openmbean.OpenType;
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import java.util.Arrays;
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import java.util.stream.Stream;
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/**
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 * A CompositeData for StackTraceElement for the local management support.
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 * This class avoids the performance penalty paid to the
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 * construction of a CompositeData use in the local case.
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 */
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public class StackTraceElementCompositeData extends LazyCompositeData {
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    private final StackTraceElement ste;
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    private StackTraceElementCompositeData(StackTraceElement ste) {
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        this.ste = ste;
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    }
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    public StackTraceElement getStackTraceElement() {
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        return ste;
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    }
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    public static StackTraceElement from(CompositeData cd) {
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        validateCompositeData(cd);
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        if (STACK_TRACE_ELEMENT_COMPOSITE_TYPE.equals(cd.getCompositeType())) {
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            return new StackTraceElement(getString(cd, CLASS_LOADER_NAME),
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                                         getString(cd, MODULE_NAME),
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                                         getString(cd, MODULE_VERSION),
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                                         getString(cd, CLASS_NAME),
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                                         getString(cd, METHOD_NAME),
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                                         getString(cd, FILE_NAME),
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                                         getInt(cd, LINE_NUMBER));
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        } else {
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            return new StackTraceElement(getString(cd, CLASS_NAME),
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                                         getString(cd, METHOD_NAME),
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                                         getString(cd, FILE_NAME),
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                                         getInt(cd, LINE_NUMBER));
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        }
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    }
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    public static CompositeData toCompositeData(StackTraceElement ste) {
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        StackTraceElementCompositeData cd = new StackTraceElementCompositeData(ste);
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        return cd.getCompositeData();
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    }
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    protected CompositeData getCompositeData() {
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        // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH
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        // STACK_TRACE_ELEMENT_ATTRIBUTES!
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        final Object[] stackTraceElementItemValues = {
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            ste.getClassLoaderName(),
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            ste.getModuleName(),
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            ste.getModuleVersion(),
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            ste.getClassName(),
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            ste.getMethodName(),
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            ste.getFileName(),
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            ste.getLineNumber(),
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            ste.isNativeMethod(),
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        };
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        try {
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            return new CompositeDataSupport(STACK_TRACE_ELEMENT_COMPOSITE_TYPE,
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                                            STACK_TRACE_ELEMENT_ATTRIBUTES,
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                                            stackTraceElementItemValues);
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        } catch (OpenDataException e) {
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            // Should never reach here
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            throw new AssertionError(e);
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        }
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    }
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    // Attribute names
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    private static final String CLASS_LOADER_NAME = "classLoaderName";
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    private static final String MODULE_NAME       = "moduleName";
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    private static final String MODULE_VERSION    = "moduleVersion";
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    private static final String CLASS_NAME        = "className";
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    private static final String METHOD_NAME       = "methodName";
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    private static final String FILE_NAME         = "fileName";
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    private static final String LINE_NUMBER       = "lineNumber";
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    private static final String NATIVE_METHOD     = "nativeMethod";
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    private static final String[] V5_ATTRIBUTES = {
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        CLASS_NAME,
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        METHOD_NAME,
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        FILE_NAME,
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        LINE_NUMBER,
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        NATIVE_METHOD,
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    };
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    private static final String[] V9_ATTRIBUTES = {
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        CLASS_LOADER_NAME,
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        MODULE_NAME,
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        MODULE_VERSION,
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    };
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    private static final String[] STACK_TRACE_ELEMENT_ATTRIBUTES =
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        Stream.of(V5_ATTRIBUTES, V9_ATTRIBUTES).flatMap(Arrays::stream)
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              .toArray(String[]::new);
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    private static final CompositeType STACK_TRACE_ELEMENT_COMPOSITE_TYPE;
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    private static final CompositeType V5_COMPOSITE_TYPE;
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    static {
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        try {
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            STACK_TRACE_ELEMENT_COMPOSITE_TYPE = (CompositeType)
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                MappedMXBeanType.toOpenType(StackTraceElement.class);
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            OpenType<?>[] types = new OpenType<?>[V5_ATTRIBUTES.length];
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            for (int i=0; i < V5_ATTRIBUTES.length; i++) {
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                String name = V5_ATTRIBUTES[i];
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                types[i] = STACK_TRACE_ELEMENT_COMPOSITE_TYPE.getType(name);
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            }
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            V5_COMPOSITE_TYPE = new CompositeType("StackTraceElement",
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                                                  "JDK 5 StackTraceElement",
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                                                  V5_ATTRIBUTES,
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                                                  V5_ATTRIBUTES,
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                                                  types);
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        } catch (OpenDataException e) {
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            // Should never reach here
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            throw new AssertionError(e);
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        }
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    }
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    static CompositeType v5CompositeType() {
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        return V5_COMPOSITE_TYPE;
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    }
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    static CompositeType compositeType() {
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        return STACK_TRACE_ELEMENT_COMPOSITE_TYPE;
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    }
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    /**
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     * Validate if the input CompositeData has the expected
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     * CompositeType (i.e. contain all attributes with expected
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     * names and types).
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     */
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    public static void validateCompositeData(CompositeData cd) {
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        if (cd == null) {
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            throw new NullPointerException("Null CompositeData");
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        }
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        CompositeType ct = cd.getCompositeType();
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        if (!isTypeMatched(STACK_TRACE_ELEMENT_COMPOSITE_TYPE, ct) &&
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            !isTypeMatched(V5_COMPOSITE_TYPE, ct)) {
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            throw new IllegalArgumentException(
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                "Unexpected composite type for StackTraceElement");
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        }
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    }
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    private static final long serialVersionUID = -2704607706598396827L;
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}