src/jdk.jfr/share/classes/jdk/jfr/consumer/ObjectFactory.java
author egahlin
Mon, 08 Jul 2019 23:08:05 +0200
branchJEP-349-branch
changeset 57460 bcbc53560c77
parent 57360 5d043a159d5c
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, 2019, 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 jdk.jfr.internal.Type;
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/**
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 * Abstract factory for creating specialized types
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 */
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abstract class ObjectFactory<T> {
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    final static String TYPE_PREFIX_VERSION_1 = "com.oracle.jfr.types.";
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    final static String TYPE_PREFIX_VERSION_2 = Type.TYPES_PREFIX;
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    final static String STACK_FRAME_VERSION_1 = TYPE_PREFIX_VERSION_1 + "StackFrame";
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    final static String STACK_FRAME_VERSION_2 = TYPE_PREFIX_VERSION_2 + "StackFrame";
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    public static ObjectFactory<?> create(Type type, TimeConverter timeConverter) {
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        switch (type.getName()) {
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        case "java.lang.Thread":
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            return RecordedThread.createFactory(type, timeConverter);
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        case TYPE_PREFIX_VERSION_1 + "StackFrame":
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        case TYPE_PREFIX_VERSION_2 + "StackFrame":
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            return RecordedFrame.createFactory(type, timeConverter);
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        case TYPE_PREFIX_VERSION_1 + "Method":
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        case TYPE_PREFIX_VERSION_2 + "Method":
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            return RecordedMethod.createFactory(type, timeConverter);
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        case TYPE_PREFIX_VERSION_1 + "ThreadGroup":
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        case TYPE_PREFIX_VERSION_2 + "ThreadGroup":
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            return RecordedThreadGroup.createFactory(type, timeConverter);
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        case TYPE_PREFIX_VERSION_1 + "StackTrace":
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        case TYPE_PREFIX_VERSION_2 + "StackTrace":
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            return RecordedStackTrace.createFactory(type, timeConverter);
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        case TYPE_PREFIX_VERSION_1 + "ClassLoader":
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        case TYPE_PREFIX_VERSION_2 + "ClassLoader":
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            return RecordedClassLoader.createFactory(type, timeConverter);
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        case "java.lang.Class":
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            return RecordedClass.createFactory(type, timeConverter);
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        }
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        return null;
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    }
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    private final ObjectContext objectContext;
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    ObjectFactory(Type type, TimeConverter timeConverter) {
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        this.objectContext = new ObjectContext(null, type.getFields(), timeConverter);
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    }
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    T createObject(long id, Object value) {
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        if (value == null) {
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            return null;
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        }
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        if (value instanceof Object[]) {
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            return createTyped(objectContext, id, (Object[]) value);
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        }
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        throw new InternalError("Object factory must have struct type. Type was " + value.getClass().getName());
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    }
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    abstract T createTyped(ObjectContext objectContextm, long id, Object[] values);
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}