b960939ea0
Motivation: The javadocs are incorrect and so give false impressions of use-pattern. Modifications: - Fix javadocs of which operations are allowed from multiple threads concurrently. - Let isEmpty() work concurrently. Result: Correctly document usage-patterns.
55 lines
1.9 KiB
Java
55 lines
1.9 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util.internal;
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import java.io.Serializable;
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import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
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abstract class MpscLinkedQueueHeadRef<E> extends MpscLinkedQueuePad0<E> implements Serializable {
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private static final long serialVersionUID = 8467054865577874285L;
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@SuppressWarnings("rawtypes")
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private static final AtomicReferenceFieldUpdater<MpscLinkedQueueHeadRef, MpscLinkedQueueNode> UPDATER;
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static {
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@SuppressWarnings("rawtypes")
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AtomicReferenceFieldUpdater<MpscLinkedQueueHeadRef, MpscLinkedQueueNode> updater;
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updater = PlatformDependent.newAtomicReferenceFieldUpdater(MpscLinkedQueueHeadRef.class, "headRef");
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if (updater == null) {
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updater = AtomicReferenceFieldUpdater.newUpdater(
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MpscLinkedQueueHeadRef.class, MpscLinkedQueueNode.class, "headRef");
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}
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UPDATER = updater;
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}
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private transient volatile MpscLinkedQueueNode<E> headRef;
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protected final MpscLinkedQueueNode<E> headRef() {
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return headRef;
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}
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protected final void setHeadRef(MpscLinkedQueueNode<E> headRef) {
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this.headRef = headRef;
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}
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protected final void lazySetHeadRef(MpscLinkedQueueNode<E> headRef) {
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UPDATER.lazySet(this, headRef);
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}
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}
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