All classes are released to the public domain and may be used for any
purpose whatsoever without permission or acknowledgment. Portions of
the CopyOnWriteArrayList and ConcurrentReaderHashMap classes are
adapted from Sun JDK source code. These are copyright of Sun
Microsystems, Inc, and are used with their kind permission,  as
described in this license: 
http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/sun-u.c.license.pdf

