ThreadLocalSingleton.java

/*
 * Boilerplate thread local singleton
 */
protected Singleton() {} //enforce singleton pattern with protected constructor

private static ThreadLocal<Singleton> instance = null; //the current thread instance

/** Get the singleton instance of this service
 *  If no instance exists for this thread, instantiate one
 * 
 * @return
 */
public static Singleton getInstance() {
	if (instance == null) {
		instance = new ThreadLocal<Singleton>() {
			@Override
			protected Singleton initialValue() {
				return new Singleton();
			}
		};
	}
return instance.get();
}