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78 lines
1.5 KiB
78 lines
1.5 KiB
/*
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* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.nio.channels.spi;
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import java.nio.channels.*;
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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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/**
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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 valid = true;
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public final boolean isValid() {
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return valid;
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}
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void invalidate() { // package-private
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valid = false;
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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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// Synchronizing "this" to prevent this key from getting canceled
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// multiple times by different threads, which might cause race
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// condition between selector's select() and channel's close().
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synchronized (this) {
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if (valid) {
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valid = false;
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((AbstractSelector)selector()).cancel(this);
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}
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}
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}
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}
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