8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/java/nio/channels/spi/AbstractSelectionKey.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+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
+ * @since 1.4
+ */
+
+public abstract class AbstractSelectionKey
+    extends SelectionKey
+{
+
+    /**
+     * Initializes a new instance of this class.
+     */
+    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() {
+        // Synchronizing "this" to prevent this key from getting canceled
+        // multiple times by different threads, which might cause race
+        // condition between selector's select() and channel's close().
+        synchronized (this) {
+            if (valid) {
+                valid = false;
+                ((AbstractSelector)selector()).cancel(this);
+            }
+        }
+    }
+}