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Remove custom regex cache and just use a weak-valued map. #2078.
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core/src/main/java/org/jruby/util/collections/WeakValuedMap.java
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/***** BEGIN LICENSE BLOCK ***** | ||
* Version: EPL 1.0/GPL 2.0/LGPL 2.1 | ||
* | ||
* The contents of this file are subject to the Eclipse Public | ||
* License Version 1.0 (the "License"); you may not use this file | ||
* except in compliance with the License. You may obtain a copy of | ||
* the License at http://www.eclipse.org/legal/epl-v10.html | ||
* | ||
* Software distributed under the License is distributed on an "AS | ||
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or | ||
* implied. See the License for the specific language governing | ||
* rights and limitations under the License. | ||
* | ||
* Copyright (C) 2002-2004 Jan Arne Petersen <jpetersen@uni-bonn.de> | ||
* Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se> | ||
* Copyright (C) 2004-2006 Charles O Nutter <headius@headius.com> | ||
* Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de> | ||
* | ||
* Alternatively, the contents of this file may be used under the terms of | ||
* either of the GNU General Public License Version 2 or later (the "GPL"), | ||
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), | ||
* in which case the provisions of the GPL or the LGPL are applicable instead | ||
* of those above. If you wish to allow use of your version of this file only | ||
* under the terms of either the GPL or the LGPL, and not to allow others to | ||
* use your version of this file under the terms of the EPL, indicate your | ||
* decision by deleting the provisions above and replace them with the notice | ||
* and other provisions required by the GPL or the LGPL. If you do not delete | ||
* the provisions above, a recipient may use your version of this file under | ||
* the terms of any one of the EPL, the GPL or the LGPL. | ||
***** END LICENSE BLOCK *****/ | ||
package org.jruby.util.collections; | ||
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import java.lang.ref.ReferenceQueue; | ||
import java.lang.ref.WeakReference; | ||
import java.util.IdentityHashMap; | ||
import java.util.Map; | ||
import java.util.concurrent.ConcurrentHashMap; | ||
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/** | ||
* A Map that holds its values weakly and uses object identity for keys. | ||
*/ | ||
public class WeakValuedMap<Key, Value> { | ||
private final ReferenceQueue deadReferences = new ReferenceQueue(); | ||
private final Map<Key, KeyedReference<Key, Value>> references = newMap(); | ||
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public void put(Key key, Value value) { | ||
cleanReferences(); | ||
references.put(key, new KeyedReference(value, key, deadReferences)); | ||
} | ||
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public Value get(Key key) { | ||
cleanReferences(); | ||
KeyedReference<Key, Value> reference = references.get(key); | ||
if (reference == null) { | ||
return null; | ||
} | ||
return reference.get(); | ||
} | ||
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protected Map<Key, KeyedReference<Key, Value>> newMap() { | ||
return new ConcurrentHashMap(); | ||
} | ||
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protected static class KeyedReference<Key, Value> extends WeakReference<Value> { | ||
private final Key key; | ||
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public KeyedReference(Value object, Key key, ReferenceQueue queue) { | ||
super(object, queue); | ||
this.key = key; | ||
} | ||
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public Key key() { | ||
return key; | ||
} | ||
} | ||
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private void cleanReferences() { | ||
KeyedReference ref; | ||
while ((ref = (KeyedReference) deadReferences.poll()) != null) { | ||
references.remove((ref.key())); | ||
} | ||
} | ||
} |