/*
* @(#)AbstractSelectionKey.java 1.11 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.nio.channels.spi;
import java.nio.channels.*;
/**
* Base implementation class for selection keys.
*
* <p> This class tracks the validity of the key and implements cancellation.
*
* @author Mark Reinhold
* @author JSR-51 Expert Group
* @version 1.11, 03/12/19
* @since 1.4
*/
public abstract class AbstractSelectionKey
extends SelectionKey
{
/**
* Initializes a new instance of this class. </p>
*/
protected AbstractSelectionKey() { }
private volatile boolean valid = true;
public final boolean isValid() {
return valid;
}
void invalidate() { // package-private
valid = false;
}
/**
* Cancels this key.
*
* <p> If this key has not yet been cancelled then it is added to its
* selector's cancelled-key set while synchronized on that set. </p>
*/
public final void cancel() {
if (valid) {
valid = false;
((AbstractSelector)selector()).cancel(this);
}
}
}
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