1/* 2 * Copyright (c) 2015, 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 */ 25package sun.management; 26 27import java.lang.management.ThreadInfo; 28import java.util.ArrayList; 29import java.util.HashMap; 30import java.util.List; 31import java.util.Map; 32import java.util.function.Predicate; 33import javax.management.openmbean.ArrayType; 34import javax.management.openmbean.CompositeType; 35import javax.management.openmbean.OpenDataException; 36import javax.management.openmbean.OpenType; 37import javax.management.openmbean.SimpleType; 38import javax.management.openmbean.TabularType; 39import static sun.management.Util.toStringArray; 40 41/** 42 * Provides simplistic support for versioning of {@linkplain CompositeType} instances 43 * based on the latest version and filtering out certain items. 44 */ 45final class TypeVersionMapper { 46 private static final class Singleton { 47 private final static TypeVersionMapper INSTANCE = new TypeVersionMapper(); 48 } 49 50 final static String V5 = "J2SE 5.0"; 51 final static String V6 = "Java SE 6"; 52 53 private final Map<String, Map<String, Predicate<String>>> filterMap; 54 55 private TypeVersionMapper() { 56 filterMap = new HashMap<>(); 57 setupStackTraceElement(); 58 setupThreadInfo(); 59 } 60 61 public static TypeVersionMapper getInstance() { 62 return Singleton.INSTANCE; 63 } 64 65 private void setupStackTraceElement() { 66 Map<String, Predicate<String>> filter = new HashMap<>(); 67 filterMap.put(StackTraceElement.class.getName(), filter); 68 filter.put(V5, StackTraceElementCompositeData::isV6Attribute); 69 filter.put(V6, StackTraceElementCompositeData::isV6Attribute); 70 } 71 72 private void setupThreadInfo() { 73 Map<String, Predicate<String>> filter = new HashMap<>(); 74 filterMap.put(ThreadInfo.class.getName(), filter); 75 filter.put(V5, ThreadInfoCompositeData::isV5Attribute); 76 filter.put(V6, ThreadInfoCompositeData::isV6Attribute); 77 } 78 79 /** 80 * Retrieves the specified version of a {@linkplain CompositeType} instance. 81 * @param type The current (latest) version of {@linkplain CompositeType} 82 * @param version The version identifier (eg. {@linkplain TypeVersionMapper#V5}) 83 * @return Returns the {@linkplain CompositeType} corresponding to the requested 84 * version. 85 * @throws OpenDataException 86 */ 87 CompositeType getVersionedCompositeType(CompositeType type, String version) 88 throws OpenDataException 89 { 90 Predicate<String> filter = getFilter(type.getTypeName(), version); 91 if (filter == null) { 92 return type; 93 } 94 95 List<String> itemNames = new ArrayList<>(); 96 List<String> itemDesc = new ArrayList<>(); 97 List<OpenType<?>> itemTypes = new ArrayList<>(); 98 99 for(String item : type.keySet()) { 100 if (filter.test(item)) { 101 itemNames.add(item); 102 itemDesc.add(type.getDescription(item)); 103 itemTypes.add(getVersionedType( 104 type.getType(item), 105 version 106 )); 107 } 108 } 109 return new CompositeType( 110 type.getTypeName(), 111 version != null ? version + " " + type.getDescription() : type.getDescription(), 112 itemNames.toArray(new String[itemNames.size()]), 113 itemDesc.toArray(new String[itemDesc.size()]), 114 itemTypes.toArray(new OpenType<?>[itemTypes.size()]) 115 ); 116 } 117 118 private OpenType<?> getVersionedType(OpenType<?> type, String version) 119 throws OpenDataException 120 { 121 if (type instanceof ArrayType) { 122 return getVersionedArrayType((ArrayType)type, version); 123 } 124 if (type instanceof CompositeType) { 125 return getVersionedCompositeType((CompositeType)type, version); 126 } 127 if (type instanceof TabularType) { 128 return getVersionedTabularType((TabularType)type, version); 129 } 130 return type; 131 } 132 133 private ArrayType<?> getVersionedArrayType(ArrayType<?> type, String version) 134 throws OpenDataException 135 { 136 if (type.isPrimitiveArray()) { 137 return type; 138 } 139 OpenType<?> ot = getVersionedType( 140 type.getElementOpenType(), 141 version 142 ); 143 if (ot instanceof SimpleType) { 144 return new ArrayType<>((SimpleType<?>)ot, type.isPrimitiveArray()); 145 } else { 146 return new ArrayType<>(type.getDimension(), ot); 147 } 148 } 149 150 private TabularType getVersionedTabularType(TabularType type, String version) 151 throws OpenDataException 152 { 153 CompositeType ct = getVersionedCompositeType( 154 type.getRowType(), 155 version 156 ); 157 158 if (ct != null) { 159 return new TabularType( 160 type.getTypeName(), type.getDescription(), ct, 161 toStringArray(type.getIndexNames())); 162 } 163 return null; 164 } 165 166 private Predicate<String> getFilter(String type, String version) { 167 Map<String, Predicate<String>> versionMap = filterMap.get(type); 168 if (versionMap == null) { 169 return null; 170 } 171 172 return versionMap.get(version); 173 } 174} 175