diff -r 537ddd8aa407 -r 2036ebfaccda src/org/sipdroid/net/tools/ObjectPool.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/sipdroid/net/tools/ObjectPool.java	Fri Nov 20 19:29:42 2009 +0100
@@ -0,0 +1,37 @@
+package org.sipdroid.net.tools;
+
+import java.util.ArrayList;
+
+public abstract class ObjectPool<E> {  
+	private ArrayList<Object> locked, unlocked;
+
+	ObjectPool(int size){
+		locked = new ArrayList<Object>(size);         
+		unlocked = new ArrayList<Object>(size);
+	}
+
+	public int getPoolSize() {
+		return locked.size() + unlocked.size();
+	}
+
+	abstract Object create();
+	abstract boolean validate( Object o );
+	synchronized Object checkOut(){     
+		if(unlocked.size() > 0){
+			Object cur = unlocked.get(0);
+			unlocked.remove(cur);
+			locked.add(cur);           
+			return(cur);
+		}      
+		// no objects available, create a new one
+		Object o = create();
+		locked.add(o);
+		return(o);
+	}
+
+	synchronized void checkIn( Object o ) {
+		locked.remove( o );
+		unlocked.add(o);
+	}
+
+}