0N/A/*
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
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0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
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0N/A */
0N/A
0N/Apackage java.nio.channels.spi;
0N/A
0N/Aimport java.nio.channels.*;
0N/A
0N/A
0N/A/**
0N/A * Base implementation class for selection keys.
0N/A *
0N/A * <p> This class tracks the validity of the key and implements cancellation.
0N/A *
0N/A * @author Mark Reinhold
0N/A * @author JSR-51 Expert Group
0N/A * @since 1.4
0N/A */
0N/A
0N/Apublic abstract class AbstractSelectionKey
0N/A extends SelectionKey
0N/A{
0N/A
0N/A /**
0N/A * Initializes a new instance of this class. </p>
0N/A */
0N/A protected AbstractSelectionKey() { }
0N/A
0N/A private volatile boolean valid = true;
0N/A
0N/A public final boolean isValid() {
0N/A return valid;
0N/A }
0N/A
0N/A void invalidate() { // package-private
0N/A valid = false;
0N/A }
0N/A
0N/A /**
0N/A * Cancels this key.
0N/A *
0N/A * <p> If this key has not yet been cancelled then it is added to its
0N/A * selector's cancelled-key set while synchronized on that set. </p>
0N/A */
0N/A public final void cancel() {
0N/A // Synchronizing "this" to prevent this key from getting canceled
0N/A // multiple times by different threads, which might cause race
0N/A // condition between selector's select() and channel's close().
0N/A synchronized (this) {
0N/A if (valid) {
0N/A valid = false;
0N/A ((AbstractSelector)selector()).cancel(this);
0N/A }
0N/A }
0N/A }
0N/A}