src/jdk.jfr/share/classes/jdk/jfr/consumer/RecordedClass.java
author egahlin
Mon, 08 Jul 2019 23:08:05 +0200
branchJEP-349-branch
changeset 57460 bcbc53560c77
parent 50113 caf115bb98ad
child 58112 e7754025004b
permissions -rw-r--r--
Reduce allocation rate by minimizing number of fields in RecordedEvent
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/*
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 * Copyright (c) 2016, 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 jdk.jfr.consumer;
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import java.lang.reflect.Modifier;
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import jdk.jfr.internal.Type;
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/**
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 * A recorded Java type, such as a class or an interface.
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 *
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 * @since 9
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 */
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public final class RecordedClass extends RecordedObject {
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    static ObjectFactory<RecordedClass> createFactory(Type type, TimeConverter timeConverter) {
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        return new ObjectFactory<RecordedClass>(type, timeConverter) {
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            @Override
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            RecordedClass createTyped(ObjectContext objectContext, long id, Object[] values) {
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                return new RecordedClass(objectContext, id, values);
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            }
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        };
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    }
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    private final long uniqueId;
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    // package private
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    private RecordedClass(ObjectContext objectContext, long id, Object[] values) {
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        super(objectContext, values);
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        this.uniqueId = id;
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    }
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    /**
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     * Returns the modifiers of the class.
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     * <p>
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     * See {@link java.lang.reflect.Modifier}
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     *
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     * @return the modifiers
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     *
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     * @see Modifier
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     */
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    public int getModifiers() {
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        return getTyped("modifiers", Integer.class, -1);
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    }
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    /**
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     * Returns the class loader that defined the class.
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     * <P>
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     * If the bootstrap class loader is represented as {@code null} in the Java
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     * Virtual Machine (JVM), then {@code null} is also the return value of this method.
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     *
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     * @return the class loader defining this class, can be {@code null}
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     */
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    public RecordedClassLoader getClassLoader() {
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        return getTyped("classLoader", RecordedClassLoader.class, null);
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    }
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    /**
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     * Returns the fully qualified name of the class (for example,
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     * {@code "java.lang.String"}).
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     *
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     * @return the class name, not {@code null}
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     */
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    public String getName() {
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        return getTyped("name", String.class, null).replace("/", ".");
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    }
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    /**
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     * Returns a unique ID for the class.
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     * <p>
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     * The ID might not be the same between Java Virtual Machine (JVM) instances.
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     *
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     * @return a unique ID
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     */
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    public long getId() {
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        return uniqueId;
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    }
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}