1 /*
   2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.consumer;
  27 
  28 import java.util.List;
  29 
  30 import jdk.jfr.ValueDescriptor;
  31 import jdk.jfr.internal.Type;
  32 
  33 /**
  34  * Abstract factory for creating specialized types
  35  */
  36 abstract class ObjectFactory<T> {
  37 
  38     final static String TYPE_PREFIX_VERSION_1 = "com.oracle.jfr.types.";
  39     final static String TYPE_PREFIX_VERSION_2 = Type.TYPES_PREFIX;
  40     final static String STACK_FRAME_VERSION_1 = TYPE_PREFIX_VERSION_1 + "StackFrame";
  41     final static String STACK_FRAME_VERSION_2 = TYPE_PREFIX_VERSION_2 + "StackFrame";
  42 
  43     public static ObjectFactory<?> create(Type type, TimeConverter timeConverter) {
  44         switch (type.getName()) {
  45         case "java.lang.Thread":
  46             return RecordedThread.createFactory(type, timeConverter);
  47         case TYPE_PREFIX_VERSION_1 + "StackFrame":
  48         case TYPE_PREFIX_VERSION_2 + "StackFrame":
  49             return RecordedFrame.createFactory(type, timeConverter);
  50         case TYPE_PREFIX_VERSION_1 + "Method":
  51         case TYPE_PREFIX_VERSION_2 + "Method":
  52             return RecordedMethod.createFactory(type, timeConverter);
  53         case TYPE_PREFIX_VERSION_1 + "ThreadGroup":
  54         case TYPE_PREFIX_VERSION_2 + "ThreadGroup":
  55             return RecordedThreadGroup.createFactory(type, timeConverter);
  56         case TYPE_PREFIX_VERSION_1 + "StackTrace":
  57         case TYPE_PREFIX_VERSION_2 + "StackTrace":
  58             return RecordedStackTrace.createFactory(type, timeConverter);
  59         case TYPE_PREFIX_VERSION_1 + "ClassLoader":
  60         case TYPE_PREFIX_VERSION_2 + "ClassLoader":
  61             return RecordedClassLoader.createFactory(type, timeConverter);
  62         case "java.lang.Class":
  63             return RecordedClass.createFactory(type, timeConverter);
  64         }
  65         return null;
  66     }
  67 
  68     private final List<ValueDescriptor> valueDescriptors;
  69 
  70     ObjectFactory(Type type) {
  71         this.valueDescriptors = type.getFields();
  72     }
  73 
  74     T createObject(long id, Object value) {
  75         if (value == null) {
  76             return null;
  77         }
  78         if (value instanceof Object[]) {
  79             return createTyped(valueDescriptors, id, (Object[]) value);
  80         }
  81         throw new InternalError("Object factory must have struct type");
  82     }
  83 
  84     abstract T createTyped(List<ValueDescriptor> valueDescriptors, long id, Object[] values);
  85 }