1 /* 2 * Copyright (c) 2003, 2013, 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.internal.misc; 27 28 import java.io.IOException; 29 import java.lang.annotation.Annotation; 30 import java.lang.reflect.Executable; 31 import java.lang.reflect.Layer; 32 import java.lang.reflect.Method; 33 import java.lang.reflect.Module; 34 import java.net.URL; 35 import java.security.AccessControlContext; 36 import java.util.Map; 37 import java.util.concurrent.ConcurrentHashMap; 38 import java.util.stream.Stream; 39 40 import jdk.internal.reflect.ConstantPool; 41 import sun.reflect.annotation.AnnotationType; 42 import sun.nio.ch.Interruptible; 43 44 public interface JavaLangAccess { 45 46 /** 47 * Returns a {@code Method} object that reflects the specified public 48 * member method of the given class. Returns {@code null} if the 49 * method is not defined. 50 */ 51 Method getMethodOrNull(Class<?> klass, String name, Class<?>... parameterTypes); 52 53 /** Return the constant pool for a class. */ 54 ConstantPool getConstantPool(Class<?> klass); 55 56 /** 57 * Compare-And-Swap the AnnotationType instance corresponding to this class. 58 * (This method only applies to annotation types.) 59 */ 60 boolean casAnnotationType(Class<?> klass, AnnotationType oldType, AnnotationType newType); 61 62 /** 63 * Get the AnnotationType instance corresponding to this class. 64 * (This method only applies to annotation types.) 65 */ 66 AnnotationType getAnnotationType(Class<?> klass); 67 68 /** 69 * Get the declared annotations for a given class, indexed by their types. 70 */ 71 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap(Class<?> klass); 72 73 /** 74 * Get the array of bytes that is the class-file representation 75 * of this Class' annotations. 76 */ 77 byte[] getRawClassAnnotations(Class<?> klass); 78 79 /** 80 * Get the array of bytes that is the class-file representation 81 * of this Class' type annotations. 82 */ 83 byte[] getRawClassTypeAnnotations(Class<?> klass); 84 85 /** 86 * Get the array of bytes that is the class-file representation 87 * of this Executable's type annotations. 88 */ 89 byte[] getRawExecutableTypeAnnotations(Executable executable); 90 91 /** 92 * Returns the elements of an enum class or null if the 93 * Class object does not represent an enum type; 94 * the result is uncloned, cached, and shared by all callers. 95 */ 96 <E extends Enum<E>> E[] getEnumConstantsShared(Class<E> klass); 97 98 /** Set thread's blocker field. */ 99 void blockedOn(Thread t, Interruptible b); 100 101 /** 102 * Registers a shutdown hook. 103 * 104 * It is expected that this method with registerShutdownInProgress=true 105 * is only used to register DeleteOnExitHook since the first file 106 * may be added to the delete on exit list by the application shutdown 107 * hooks. 108 * 109 * @param slot the slot in the shutdown hook array, whose element 110 * will be invoked in order during shutdown 111 * @param registerShutdownInProgress true to allow the hook 112 * to be registered even if the shutdown is in progress. 113 * @param hook the hook to be registered 114 * 115 * @throws IllegalStateException if shutdown is in progress and 116 * the slot is not valid to register. 117 */ 118 void registerShutdownHook(int slot, boolean registerShutdownInProgress, Runnable hook); 119 120 /** 121 * Returns a new string backed by the provided character array. The 122 * character array is not copied and must never be modified after the 123 * String is created, in order to fulfill String's contract. 124 * 125 * @param chars the character array to back the string 126 * @return a newly created string whose content is the character array 127 */ 128 String newStringUnsafe(char[] chars); 129 130 /** 131 * Returns a new Thread with the given Runnable and an 132 * inherited AccessControlContext. 133 */ 134 Thread newThreadWithAcc(Runnable target, AccessControlContext acc); 135 136 /** 137 * Invokes the finalize method of the given object. 138 */ 139 void invokeFinalize(Object o) throws Throwable; 140 141 /** 142 * Returns the boot Layer 143 */ 144 Layer getBootLayer(); 145 146 /** 147 * Returns the ConcurrentHashMap used as a storage for ClassLoaderValue(s) 148 * associated with the given class loader, creating it if it doesn't already exist. 149 */ 150 ConcurrentHashMap<?, ?> createOrGetClassLoaderValueMap(ClassLoader cl); 151 152 /** 153 * Returns a class loaded by the bootstrap class loader. 154 */ 155 Class<?> findBootstrapClassOrNull(ClassLoader cl, String name); 156 157 /** 158 * Returns a URL to a resource with the given name in a module that is 159 * defined to the given class loader. 160 */ 161 URL findResource(ClassLoader cl, String moduleName, String name) throws IOException; 162 163 /** 164 * Returns the Packages for the given class loader. 165 */ 166 Stream<Package> packages(ClassLoader cl); 167 168 /** 169 * Define a Package of the given name and module by the given class loader. 170 */ 171 Package definePackage(ClassLoader cl, String name, Module module); 172 173 /** 174 * Invokes Long.fastUUID 175 */ 176 String fastUUID(long lsb, long msb); 177 178 /** 179 * Invalidate package access cache 180 */ 181 void invalidatePackageAccessCache(); 182 }