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Java example source code file (UnsafeAtomicReferenceFieldUpdater.java)
The UnsafeAtomicReferenceFieldUpdater.java Java example source code/* * Copyright 2014 The Netty Project * * The Netty Project licenses this file to you 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 io.netty.util.internal; import sun.misc.Unsafe; import java.lang.reflect.Field; import java.lang.reflect.Modifier; import java.util.concurrent.atomic.AtomicReferenceFieldUpdater; final class UnsafeAtomicReferenceFieldUpdater<U, M> extends AtomicReferenceFieldUpdater { private final long offset; private final Unsafe unsafe; UnsafeAtomicReferenceFieldUpdater(Unsafe unsafe, Class<? super U> tClass, String fieldName) throws NoSuchFieldException { Field field = tClass.getDeclaredField(fieldName); if (!Modifier.isVolatile(field.getModifiers())) { throw new IllegalArgumentException("Must be volatile"); } this.unsafe = unsafe; offset = unsafe.objectFieldOffset(field); } @Override public boolean compareAndSet(U obj, M expect, M update) { return unsafe.compareAndSwapObject(obj, offset, expect, update); } @Override public boolean weakCompareAndSet(U obj, M expect, M update) { return unsafe.compareAndSwapObject(obj, offset, expect, update); } @Override public void set(U obj, M newValue) { unsafe.putObjectVolatile(obj, offset, newValue); } @Override public void lazySet(U obj, M newValue) { unsafe.putOrderedObject(obj, offset, newValue); } @SuppressWarnings("unchecked") @Override public M get(U obj) { return (M) unsafe.getObjectVolatile(obj, offset); } } Other Java examples (source code examples)Here is a short list of links related to this Java UnsafeAtomicReferenceFieldUpdater.java source code file: |
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