An Enum for Event Processing option.
drools.eventProcessingMode = <identity|equality>
When the rulebase is compiled in the CLOUD (default) event processing mode,
it behaves just like a regular rulebase.
When the rulebase is compiled in the STREAM event processing mode, additional
assumptions are made. These assumptions allow the engine to perform a few optimisations
reasoning over absence of events (NOT CE), automatically adds an appropriate duration attribute
to the rule in order to avoid early rule firing.
memory management techniques may be employed when an event no longer can match other events
due to session clock continuous increment.
The property name for the sequential mode option
return "EventProcessingOption( "+string+ " )";