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86 lines
2.8 KiB
Java
86 lines
2.8 KiB
Java
/*
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* Copyright (c) 2000, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.nio.channels.spi;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.VarHandle;
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import java.nio.channels.SelectionKey;
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import java.nio.channels.Selector;
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import jdk.internal.invoke.MhUtil;
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import sun.nio.ch.SelectionKeyImpl;
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import sun.nio.ch.SelectorImpl;
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/**
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* Base implementation class for selection keys.
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*
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* <p> This class tracks the validity of the key and implements cancellation.
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*
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* @author Mark Reinhold
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* @author JSR-51 Expert Group
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* @since 1.4
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*/
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public abstract class AbstractSelectionKey
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extends SelectionKey
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{
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private static final VarHandle INVALID = MhUtil.findVarHandle(
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MethodHandles.lookup(), "invalid", boolean.class);
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/**
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* Initializes a new instance of this class.
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*/
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protected AbstractSelectionKey() { }
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private volatile boolean invalid;
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public final boolean isValid() {
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return !invalid;
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}
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void invalidate() { // package-private
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invalid = true;
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}
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/**
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* Cancels this key.
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*
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* <p> If this key has not yet been cancelled then it is added to its
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* selector's cancelled-key set while synchronized on that set. </p>
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*/
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public final void cancel() {
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boolean changed = (boolean) INVALID.compareAndSet(this, false, true);
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if (changed) {
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Selector sel = selector();
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if (sel instanceof SelectorImpl) {
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// queue cancelled key directly
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((SelectorImpl) sel).cancel((SelectionKeyImpl) this);
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} else {
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((AbstractSelector) sel).cancel(this);
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}
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}
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}
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}
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