Package org.apache.hadoop.yarn.state

Interface StateTransitionListener<OPERAND,EVENT,STATE extends Enum<STATE>>

All Known Implementing Classes:

MultiStateTransitionListener

@Public
@Evolving
public interface StateTransitionListener<OPERAND,EVENT,STATE extends Enum<STATE>>

A State Transition Listener. It exposes a pre and post transition hook called before and after the transition.

Method Summary

Modifier and Type	Method	Description
void	postTransition(OPERAND op, STATE beforeState, STATE afterState, EVENT processedEvent)	Post Transition Hook.
void	preTransition(OPERAND op, STATE beforeState, EVENT eventToBeProcessed)	Pre Transition Hook.

Method Details

preTransition

void preTransition(OPERAND op,
 STATE beforeState,
 EVENT eventToBeProcessed)

Pre Transition Hook. This will be called before transition.

Parameters:

op - Operand.

beforeState - State before transition.

eventToBeProcessed - Incoming Event.

postTransition

void postTransition(OPERAND op,
 STATE beforeState,
 STATE afterState,
 EVENT processedEvent)

Post Transition Hook. This will be called after the transition.

Parameters:

op - Operand.

beforeState - State before transition.

afterState - State after transition.

processedEvent - Processed Event.