public abstract class AbstractLazyCreationTargetSource
TargetSource implementation that will
lazily create a user-managed object.
Creation of the lazy target object is controlled by the user by implementing
the createObject() method. This TargetSource will invoke
this method the first time the proxy is accessed.
Useful when you need to pass a reference to some dependency to an object
but you don't actually want the dependency to be created until it is first used.
A typical scenario for this is a connection to a remote resource.