Programmer Reference : Asynchronous Programming : EsFutureListener
EsFutureListener
The listener is registered on a future and handles value/error completions
STATE\ nextListener - <EsFutureListener> Listeners on the same future are linked through this link.\ result - <EsFutureImpl> The future to complete when this listener is activated.\ state - <Integer> Which fields means what.\ handler - <Block> Used for then/whenDone callback and error test\ errorHandler - <Block> Used for error callbacks.\
Class Methods
catchError:onError:test: 
  Answer a new listener that handles errors emitted by a future

     Arguments:
        aResult - <EsFutureImpl>
        onError - <Block>
        onErrorTest - <Block>
     Answers:
        <EsFutureListener>
then:onValue:onError: 
  Answer a new listener that handles a future's completion value

     Arguments:
        aResult - <EsFutureImpl>
        onValue - <Block>
        onError - <Block>
     Answers:
        <EsFutureListener>
whenComplete:handler: 
  Answer a new listener whose handler is called when a future completes

     Arguments:
        aResult - <EsFutureImpl>
        aHandler - <Block>
     Answers:
        <EsFutureListener>
Instance Methods
hasErrorHandler 
  Whether this listener has an error handler.

     This method must only be called if the listener #handlesError

     Answers:
        <Boolean>
result 
  Answer the future to complete when this listener is activated

     Answers:
        <EsFutureImpl>
Last modified date: 02/23/2021