EPListenable (Esper API Documentation)

All Known Subinterfaces:

EPStatement, EPStatementSPI

All Known Implementing Classes:

EPStatementImpl
```
public interface EPListenable
```
Interface to add and remove update listeners.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`addListener(StatementAwareUpdateListener listener)` Add a statement-aware listener that observes events.
`void`	`addListener(UpdateListener listener)` Add a listener that observes events.
`Iterator<StatementAwareUpdateListener>`	`getStatementAwareListeners()` Returns an iterator of statement-aware update listeners.
`Iterator<UpdateListener>`	`getUpdateListeners()` Returns an iterator of update listeners.
`void`	`removeAllListeners()` Remove all listeners.
`void`	`removeListener(StatementAwareUpdateListener listener)` Remove a statement-aware listener that observes events.
`void`	`removeListener(UpdateListener listener)` Remove a listener that observes events.

- Method Detail
  - addListener
```
void addListener(UpdateListener listener)
```
    Add a listener that observes events.
    
    Parameters:
    
    listener - to add
    
    Throws:
    
    IllegalStateException - when attempting to add a listener to a destroyed statement
  - removeListener
```
void removeListener(UpdateListener listener)
```
    Remove a listener that observes events.
    
    Parameters:
    
    listener - to remove
  - removeAllListeners
```
void removeAllListeners()
```
    Remove all listeners.
  - addListener
```
void addListener(StatementAwareUpdateListener listener)
```
    Add a statement-aware listener that observes events.
    
    Parameters:
    
    listener - to add
    
    Throws:
    
    IllegalStateException - when attempting to add a listener to a destroyed statement
  - removeListener
```
void removeListener(StatementAwareUpdateListener listener)
```
    Remove a statement-aware listener that observes events.
    
    Parameters:
    
    listener - to remove
  - getStatementAwareListeners
```
Iterator<StatementAwareUpdateListener> getStatementAwareListeners()
```
    Returns an iterator of statement-aware update listeners.
    The returned iterator does not allow the remove operation.
    
    Returns:
    
    iterator of statement-aware update listeners
  - getUpdateListeners
```
Iterator<UpdateListener> getUpdateListeners()
```
    Returns an iterator of update listeners.
    The returned iterator does not allow the remove operation.
    
    Returns:
    
    iterator of update listeners

Interface EPListenable

Method Summary

Method Detail

addListener

removeListener

removeAllListeners

addListener

removeListener

getStatementAwareListeners

getUpdateListeners