Introduction
As seen in the simple example, our API is quite easy to use.
One of the big challenge is to know what is happening in the rule engine. The drools native API gives us all we need but you have to build all by yourself for each project you are doing.
The chtiJBUG drools APi comes with predefined listeners that when triggered will fulfill a history Container.
The insertObject, UpdateObject and retractObject take as a parameter the java beans you want to insert. It is stored in a Map therefor we are using the equals and hashcode to find the object to retract/update.
The fireAllRules and stasrtProcess speak by themselvesd a well as the dispose method that you should call to properly dispose all java objects.
The interesting par of it is getHistoryContainer which gives the list of event happening. There are 3 types of event ; about facts, processes and rules
Fact Events
| DeletedFactHistoryEvent | Each time there is a retracted object in the working memory (session) from java or from RHS (then), this event is added |
|---|---|
| InsertedFactHistoryEvent | Each time there is an inserted object in the working memory (session) from java from RHS (then) of a rule, this event is added |
| UpdatedFactHistoryEvent | Each time there is an upaded object in the working memory (session) from java or from RHS (then), this event is added |
Process Events
| NodeInstanceAfterHistoryEvent | This event is fired when leaving a node |
|---|---|
| NodeInstanceBeforeHistoryEvent | This event is fired when entering a node |
| ProcessStartHistoryEvent | When a process is started |
| ProcessEndHistoryEvent | When a process is stoped |
Our current implementation is enough when using BPMN2 process for ruleflow (see below). We shall improve it in the future
Rule Events
| AfterRuleFlowActivatedHistoryEvent | Event is fired when entering a ruleFlow group |
|---|---|
| AfterRuleFlowDeativatedHistoryEvent | Event is fired when leaving a ruleflow group |
| AfterRuleFiredHistoryEvent | Event fired after a rule was fired |
| BeforeRuleFiredHistoryEvent | Event is fired before a rule is fired |
Entity Model used for all history events
