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RubyThreadMap.java
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RubyThreadMap.java
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/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common 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/cpl-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) 2010 Charles O Nutter <headius@headius.com>
*
* 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 CPL, 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 CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.internal.runtime;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.Hashtable;
import java.util.Map;
import java.util.Set;
import org.jruby.RubyThread;
import org.jruby.runtime.ThreadContext;
public class RubyThreadMap {
/** For null keys, to mimic WeakHashMap */
private static final Object NULL_KEY = new Object();
private final Map<RubyThreadWeakReference<Object>, RubyThread> map = new Hashtable();
private final ReferenceQueue<Object> queue = new ReferenceQueue();
private final Map<RubyThread, ThreadContext> mapToClean;
public RubyThreadMap(Map<RubyThread, ThreadContext> mapToClean) {
this.mapToClean = mapToClean;
}
public static class RubyThreadWeakReference<T> extends WeakReference<T> {
private final RubyThread thread;
public int hashCode;
public RubyThreadWeakReference(T referrent, RubyThread thread) {
super(referrent);
hashCode = referrent.hashCode();
this.thread = thread;
}
public RubyThreadWeakReference(T referrent, ReferenceQueue<? super T> queue, RubyThread thread) {
super(referrent, queue);
hashCode = referrent.hashCode();
this.thread = thread;
}
public RubyThread getThread() {
return thread;
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public boolean equals(Object other) {
Object myKey = get();
if (other instanceof RubyThreadWeakReference) {
Object otherKey = ((RubyThreadWeakReference)other).get();
if (myKey != otherKey) return false;
return true;
} else if (other instanceof Thread) {
return myKey == other;
} else {
return false;
}
}
}
private void cleanup() {
RubyThreadWeakReference<Object> ref;
while ((ref = (RubyThreadWeakReference<Object>) queue.poll()) != null) {
map.remove(ref);
mapToClean.remove(ref.getThread());
}
}
public int size() {
cleanup();
return map.size();
}
public Set<Map.Entry<RubyThreadWeakReference<Object>, RubyThread>> entrySet() {
return map.entrySet();
}
public RubyThread get(Object key) {
cleanup();
key = nullKey(key);
return map.get(key);
}
public RubyThread put(Object key, RubyThread value) {
cleanup();
key = nullKey(key);
return map.put(new RubyThreadWeakReference(key, queue, value), value);
}
public RubyThread remove(Object key) {
cleanup();
key = nullKey(key);
RubyThread t = map.remove(key);
return t;
}
private Object nullKey(Object key) {
return key == null ? NULL_KEY : key;
}
}