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/*
 * Copyright 2014 Ben Manes. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.benmanes.caffeine.base;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;

import sun.misc.Unsafe;

/**
 * Static access to {@link Unsafe} and convenient utility methods for performing low-level, unsafe
 * operations.
 * 

* Warning: This class is scheduled for removal in version 3.0.0. * * @author [email protected] (Ben Manes) * @deprecated Scheduled for removal in version 3.0.0 */ @Deprecated @SuppressWarnings("restriction") public final class UnsafeAccess { static final String ANDROID = "THE_ONE"; static final String OPEN_JDK = "theUnsafe"; /** The Unsafe instance. */ public static final Unsafe UNSAFE; static { try { UNSAFE = load(OPEN_JDK, ANDROID); } catch (Exception e) { throw new Error("Failed to load sun.misc.Unsafe", e); } } /** * Returns the location of a given static field. * * @param clazz the class containing the field * @param fieldName the name of the field * @return the address offset of the field */ public static long objectFieldOffset(Class clazz, String fieldName) { try { return UNSAFE.objectFieldOffset(clazz.getDeclaredField(fieldName)); } catch (NoSuchFieldException | SecurityException e) { throw new Error(e); } } static Unsafe load(String openJdk, String android) throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException { Field field; try { // try OpenJDK field name field = Unsafe.class.getDeclaredField(openJdk); } catch (NoSuchFieldException e) { try { // try Android field name field = Unsafe.class.getDeclaredField(android); } catch (NoSuchFieldException e2) { // try to create a new instance Constructor unsafeConstructor = Unsafe.class.getDeclaredConstructor(); unsafeConstructor.setAccessible(true); return unsafeConstructor.newInstance(); } } field.setAccessible(true); return (Unsafe) field.get(null); } private UnsafeAccess() {} }





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