Trigger (Siddhi Core 5.1.30 API)

All Known Implementing Classes:

AbstractTrigger, CronTrigger, PeriodicTrigger, StartTrigger
```
public interface Trigger
```
Interface class to represent event triggers. Event triggers are used to trigger events within Siddhi itself according to a user given criteria.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`getId()`
`io.siddhi.query.api.definition.TriggerDefinition`	`getTriggerDefinition()`
`boolean`	`isStateful()`
`void`	`start()`	This will be called only once.
`void`	`stop()`	This will be called only once.

- Method Detail
  - start
```
void start()
```
    This will be called only once. This will be called after initializing the system.
  - stop
```
void stop()
```
    This will be called only once. This will be called before shutting down the system.
  - getTriggerDefinition
```
io.siddhi.query.api.definition.TriggerDefinition getTriggerDefinition()
```
  - getId
```
String getId()
```
  - isStateful
```
boolean isStateful()
```