RuleListenerService (Apache Unomi :: Root Project 2.2.0-SNAPSHOT API)

```
public interface RuleListenerService
```
A service that gets called when a rule's conditions are evaluated or when a rule's actions are executed.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class RuleListenerService.AlreadyRaisedFor
This enum indicates which type of already raised event we are dealing with

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onAlreadyRaised(RuleListenerService.AlreadyRaisedFor alreadyRaisedFor, Rule rule, Event event)`	Called when a rule has already been raised either for a session or a profile.
`void`	`onEvaluate(Rule rule, Event event)`	Called before a rule's conditions are evaluated.
`void`	`onExecuteActions(Rule rule, Event event)`	Called just before a matching rule's actions are about to be executed.

- Method Detail
  - onEvaluate
```
void onEvaluate(Rule rule,
                Event event)
```
    Called before a rule's conditions are evaluated. Be careful when implemented this listener because rule's condition are called in very high frequencies and the performance of this listener might have a huge impact on rule's performance
    
    Parameters:
    
    rule - the rule that is being evaluated
    
    event - the event we are processing and evaluating against the rule
  - onAlreadyRaised
```
void onAlreadyRaised(RuleListenerService.AlreadyRaisedFor alreadyRaisedFor,
                     Rule rule,
                     Event event)
```
    Called when a rule has already been raised either for a session or a profile.
    
    Parameters:
    
    alreadyRaisedFor - an enum that indicates if the rule was already raised once for the session or for the profile
    
    rule - the rule that has already been raised
    
    event - the event for which this rule has already been raised.
  - onExecuteActions
```
void onExecuteActions(Rule rule,
                      Event event)
```
    Called just before a matching rule's actions are about to be executed.
    
    Parameters:
    
    rule - the matching rule for the current event
    
    event - the event we are processing that matched the current rule.