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Diffstat (limited to 'src/jdk/nashorn/internal/runtime/SharedPropertyMap.java')
-rw-r--r-- | src/jdk/nashorn/internal/runtime/SharedPropertyMap.java | 100 |
1 files changed, 0 insertions, 100 deletions
diff --git a/src/jdk/nashorn/internal/runtime/SharedPropertyMap.java b/src/jdk/nashorn/internal/runtime/SharedPropertyMap.java deleted file mode 100644 index 215d0c85..00000000 --- a/src/jdk/nashorn/internal/runtime/SharedPropertyMap.java +++ /dev/null @@ -1,100 +0,0 @@ -/* - * Copyright (c) 2015, 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 jdk.nashorn.internal.runtime; - -import java.lang.invoke.SwitchPoint; - -/** - * This class represents a property map that can be shared among multiple prototype objects, allowing all inheriting - * top-level objects to also share one property map. This is class is only used for prototype objects, the - * top-level objects use ordinary {@link PropertyMap}s with the {@link PropertyMap#sharedProtoMap} field - * set to the expected shared prototype map. - * - * <p>When an instance of this class is evolved because a property is added, removed, or modified in an object - * using it, the {@link #invalidateSwitchPoint()} method is invoked to signal to all callsites and inheriting - * objects that the assumption of a single shared prototype map is no longer valid. The property map resulting - * from the modification will no longer be an instance of this class.</p> - */ -public final class SharedPropertyMap extends PropertyMap { - - private SwitchPoint switchPoint; - - private static final long serialVersionUID = 2166297719721778876L; - - /** - * Create a new shared property map from the given {@code map}. - * @param map property map to copy - */ - public SharedPropertyMap(final PropertyMap map) { - super(map); - this.switchPoint = new SwitchPoint(); - } - - @Override - public void propertyAdded(final Property property, final boolean isSelf) { - if (isSelf) { - invalidateSwitchPoint(); - } - super.propertyAdded(property, isSelf); - } - - @Override - public void propertyDeleted(final Property property, final boolean isSelf) { - if (isSelf) { - invalidateSwitchPoint(); - } - super.propertyDeleted(property, isSelf); - } - - @Override - public void propertyModified(final Property oldProperty, final Property newProperty, final boolean isSelf) { - if (isSelf) { - invalidateSwitchPoint(); - } - super.propertyModified(oldProperty, newProperty, isSelf); - } - - @Override - synchronized boolean isValidSharedProtoMap() { - return switchPoint != null; - } - - @Override - synchronized SwitchPoint getSharedProtoSwitchPoint() { - return switchPoint; - } - - /** - * Invalidate the shared prototype switch point if this is a shared prototype map. - */ - synchronized void invalidateSwitchPoint() { - if (switchPoint != null) { - assert !switchPoint.hasBeenInvalidated(); - SwitchPoint.invalidateAll(new SwitchPoint[]{ switchPoint }); - switchPoint = null; - } - } -} |