Create a new SoftReferenceCache instance
Initialize the orphan keys monitor
ShutDown the monitoring
Companion module that has the role of monitoring garbage collected references and remove the orphaned keys from the cache. The monitor is started by calling initialize function and terminated by calling shutDown. It monitors all SoftReferenceCache instances in the context of the same classloader. It can also be used as a factory for obtaining new instances of SoftReferenceCache class