--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/internal/dynalink/support/CompositeTypeBasedGuardingDynamicLinker.java Wed Jul 05 20:54:58 2017 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,223 +0,0 @@
-/*
- * Copyright (c) 2010, 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.
- */
-
-/*
- * This file is available under and governed by the GNU General Public
- * License version 2 only, as published by the Free Software Foundation.
- * However, the following notice accompanied the original version of this
- * file, and Oracle licenses the original version of this file under the BSD
- * license:
- */
-/*
- Copyright 2009-2013 Attila Szegedi
-
- Licensed under both the Apache License, Version 2.0 (the "Apache License")
- and the BSD License (the "BSD License"), with licensee being free to
- choose either of the two at their discretion.
-
- You may not use this file except in compliance with either the Apache
- License or the BSD License.
-
- If you choose to use this file in compliance with the Apache License, the
- following notice applies to you:
-
- You may obtain a copy of the Apache License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
- implied. See the License for the specific language governing
- permissions and limitations under the License.
-
- If you choose to use this file in compliance with the BSD License, the
- following notice applies to you:
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
- * Neither the name of the copyright holder nor the names of
- contributors may be used to endorse or promote products derived from
- this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
- BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-package jdk.internal.dynalink.support;
-
-import java.io.Serializable;
-import java.util.Collections;
-import java.util.LinkedList;
-import java.util.List;
-import jdk.internal.dynalink.linker.GuardedInvocation;
-import jdk.internal.dynalink.linker.GuardingDynamicLinker;
-import jdk.internal.dynalink.linker.LinkRequest;
-import jdk.internal.dynalink.linker.LinkerServices;
-import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;
-
-/**
- * A composite type-based guarding dynamic linker. When a receiver of a not yet seen class is encountered, all linkers
- * are queried sequentially on their {@link TypeBasedGuardingDynamicLinker#canLinkType(Class)} method. The linkers
- * returning true are then bound to the class, and next time a receiver of same type is encountered, the linking is
- * delegated to those linkers only, speeding up dispatch.
- */
-public class CompositeTypeBasedGuardingDynamicLinker implements TypeBasedGuardingDynamicLinker, Serializable {
- private static final long serialVersionUID = 1L;
-
- // Using a separate static class instance so there's no strong reference from the class value back to the composite
- // linker.
- private static class ClassToLinker extends ClassValue<List<TypeBasedGuardingDynamicLinker>> {
- private static final List<TypeBasedGuardingDynamicLinker> NO_LINKER = Collections.emptyList();
- private final TypeBasedGuardingDynamicLinker[] linkers;
- private final List<TypeBasedGuardingDynamicLinker>[] singletonLinkers;
-
- @SuppressWarnings({"unchecked", "rawtypes"})
- ClassToLinker(final TypeBasedGuardingDynamicLinker[] linkers) {
- this.linkers = linkers;
- singletonLinkers = new List[linkers.length];
- for(int i = 0; i < linkers.length; ++i) {
- singletonLinkers[i] = Collections.singletonList(linkers[i]);
- }
- }
-
- @SuppressWarnings("fallthrough")
- @Override
- protected List<TypeBasedGuardingDynamicLinker> computeValue(final Class<?> clazz) {
- List<TypeBasedGuardingDynamicLinker> list = NO_LINKER;
- for(int i = 0; i < linkers.length; ++i) {
- final TypeBasedGuardingDynamicLinker linker = linkers[i];
- if(linker.canLinkType(clazz)) {
- switch(list.size()) {
- case 0: {
- list = singletonLinkers[i];
- break;
- }
- case 1: {
- list = new LinkedList<>(list);
- }
- default: {
- list.add(linker);
- }
- }
- }
- }
- return list;
- }
- }
-
- private final ClassValue<List<TypeBasedGuardingDynamicLinker>> classToLinker;
-
- /**
- * Creates a new composite type-based linker.
- *
- * @param linkers the component linkers
- */
- public CompositeTypeBasedGuardingDynamicLinker(final Iterable<? extends TypeBasedGuardingDynamicLinker> linkers) {
- final List<TypeBasedGuardingDynamicLinker> l = new LinkedList<>();
- for(final TypeBasedGuardingDynamicLinker linker: linkers) {
- l.add(linker);
- }
- this.classToLinker = new ClassToLinker(l.toArray(new TypeBasedGuardingDynamicLinker[l.size()]));
- }
-
- @Override
- public boolean canLinkType(final Class<?> type) {
- return !classToLinker.get(type).isEmpty();
- }
-
- @Override
- public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices)
- throws Exception {
- final Object obj = linkRequest.getReceiver();
- if(obj == null) {
- return null;
- }
- for(final TypeBasedGuardingDynamicLinker linker: classToLinker.get(obj.getClass())) {
- final GuardedInvocation invocation = linker.getGuardedInvocation(linkRequest, linkerServices);
- if(invocation != null) {
- return invocation;
- }
- }
- return null;
- }
-
- /**
- * Optimizes a list of type-based linkers. If a group of adjacent linkers in the list all implement
- * {@link TypeBasedGuardingDynamicLinker}, they will be replaced with a single instance of
- * {@link CompositeTypeBasedGuardingDynamicLinker} that contains them.
- *
- * @param linkers the list of linkers to optimize
- * @return the optimized list
- */
- public static List<GuardingDynamicLinker> optimize(final Iterable<? extends GuardingDynamicLinker> linkers) {
- final List<GuardingDynamicLinker> llinkers = new LinkedList<>();
- final List<TypeBasedGuardingDynamicLinker> tblinkers = new LinkedList<>();
- for(final GuardingDynamicLinker linker: linkers) {
- if(linker instanceof TypeBasedGuardingDynamicLinker) {
- tblinkers.add((TypeBasedGuardingDynamicLinker)linker);
- } else {
- addTypeBased(llinkers, tblinkers);
- llinkers.add(linker);
- }
- }
- addTypeBased(llinkers, tblinkers);
- return llinkers;
- }
-
- private static void addTypeBased(final List<GuardingDynamicLinker> llinkers,
- final List<TypeBasedGuardingDynamicLinker> tblinkers) {
- switch(tblinkers.size()) {
- case 0: {
- break;
- }
- case 1: {
- llinkers.addAll(tblinkers);
- tblinkers.clear();
- break;
- }
- default: {
- llinkers.add(new CompositeTypeBasedGuardingDynamicLinker(tblinkers));
- tblinkers.clear();
- break;
- }
- }
- }
-}