use java.util.concurrent

Author: erh

src/main/org/bson/util/SimplePool.java

@@ -3,6 +3,7 @@
 package org.bson.util;
 
 import java.util.*;
+import java.util.concurrent.*;
 
 public abstract class SimplePool<T> {
 
@@ -21,23 +22,21 @@ protected boolean ok( T t ){
     }
 
     public T get(){
-        synchronized ( _stored ){
-            if ( _stored.size() > 0 ) 
-                return _stored.removeFirst();
-        }
+        T t = _stored.poll();
+        if ( t != null )
+            return t;
         return createNew();
     }
 
     public void done( T t ){
         if ( ! ok( t ) )
             return;
-        synchronized ( _stored ){
-            if ( _stored.size() > _max )
-                return;
-            _stored.addFirst( t );
-        }
+        
+        if ( _stored.size() > _max )
+            return;
+        _stored.add( t );
     }
 
     final int _max;
-    private LinkedList<T> _stored = new LinkedList<T>();
+    private Queue<T> _stored = new ConcurrentLinkedQueue<T>();
 }