author | attila |
Wed, 07 Aug 2013 16:38:44 +0200 | |
changeset 19455 | b972b61a6921 |
parent 16234 | 86cb162cec6c |
child 19461 | 30ba4fba981d |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2009-2013 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.dynalink.support; |
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import java.lang.ref.Reference; |
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import java.lang.ref.SoftReference; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.util.Map; |
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import java.util.WeakHashMap; |
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import java.util.concurrent.ConcurrentHashMap; |
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import java.util.concurrent.ConcurrentMap; |
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/** |
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* A dual map that can either strongly or weakly reference a given class depending on whether the class is visible from |
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* a class loader or not. |
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* |
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* @author Attila Szegedi |
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* @param <T> the type of the values in the map |
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*/ |
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public abstract class ClassMap<T> { |
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private final ConcurrentMap<Class<?>, T> map = new ConcurrentHashMap<>(); |
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private final Map<Class<?>, Reference<T>> weakMap = new WeakHashMap<>(); |
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private final ClassLoader classLoader; |
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/** |
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* Creates a new class map. It will use strong references for all keys and values where the key is a class visible |
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* from the class loader, and will use weak keys and soft values for all other classes. |
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* |
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* @param classLoader the classloader that determines strong referenceability. |
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*/ |
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protected ClassMap(ClassLoader classLoader) { |
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this.classLoader = classLoader; |
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} |
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/** |
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* Compute the value associated with the given class. It is possible that the method will be invoked several times |
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* (or even concurrently) for the same class parameter. |
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* |
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* @param clazz the class to compute the value for |
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* @return the return value. Must not be null. |
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*/ |
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protected abstract T computeValue(Class<?> clazz); |
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/** |
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* Returns the value associated with the class |
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* |
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* @param clazz the class |
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* @return the value associated with the class |
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*/ |
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public T get(final Class<?> clazz) { |
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133 |
// Check in fastest first - objects we're allowed to strongly reference |
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134 |
final T v = map.get(clazz); |
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135 |
if(v != null) { |
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136 |
return v; |
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137 |
} |
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138 |
// Check objects we're not allowed to strongly reference |
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139 |
Reference<T> ref; |
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140 |
synchronized(weakMap) { |
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141 |
ref = weakMap.get(clazz); |
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142 |
} |
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143 |
if(ref != null) { |
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144 |
final T refv = ref.get(); |
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145 |
if(refv != null) { |
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146 |
return refv; |
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147 |
} |
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148 |
} |
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149 |
// Not found in either place; create a new value |
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150 |
final T newV = computeValue(clazz); |
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151 |
assert newV != null; |
19455 | 152 |
|
153 |
final ClassLoader clazzLoader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() { |
|
154 |
@Override |
|
155 |
public ClassLoader run() { |
|
156 |
return clazz.getClassLoader(); |
|
157 |
} |
|
158 |
}); |
|
159 |
||
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160 |
// If allowed to strongly reference, put it in the fast map |
19455 | 161 |
if(Guards.canReferenceDirectly(classLoader, clazzLoader)) { |
16234
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162 |
final T oldV = map.putIfAbsent(clazz, newV); |
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163 |
return oldV != null ? oldV : newV; |
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164 |
} |
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165 |
// Otherwise, put it into the weak map |
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166 |
synchronized(weakMap) { |
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167 |
ref = weakMap.get(clazz); |
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168 |
if(ref != null) { |
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169 |
final T oldV = ref.get(); |
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|
170 |
if(oldV != null) { |
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171 |
return oldV; |
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|
172 |
} |
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173 |
} |
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174 |
weakMap.put(clazz, new SoftReference<>(newV)); |
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175 |
return newV; |
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176 |
} |
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177 |
} |
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178 |
} |