Package org.apache.hadoop.yarn.state

Class MultiStateTransitionListener<OPERAND,EVENT,STATE extends Enum<STATE>>

java.lang.Object

org.apache.hadoop.yarn.state.MultiStateTransitionListener<OPERAND,EVENT,STATE>

All Implemented Interfaces:

StateTransitionListener<OPERAND,EVENT,STATE>

public abstract class MultiStateTransitionListener<OPERAND,EVENT,STATE extends Enum<STATE>>
extends Object
implements StateTransitionListener<OPERAND,EVENT,STATE>

A StateTransitionListener that dispatches the pre and post state transitions to multiple registered listeners. NOTE: The registered listeners are called in a for loop. Clients should know that a listener configured earlier might prevent a later listener from being called, if for instance it throws an un-caught Exception.

Constructor Summary

Constructors

Constructor	Description
MultiStateTransitionListener()

Method Summary

Modifier and Type	Method	Description
void	addListener(StateTransitionListener<OPERAND,EVENT,STATE> listener)	Add a listener to the list of listeners.
void	postTransition(OPERAND op, STATE beforeState, STATE afterState, EVENT processedEvent)	Post Transition Hook.
void	preTransition(OPERAND op, STATE beforeState, EVENT eventToBeProcessed)	Pre Transition Hook.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MultiStateTransitionListener

public MultiStateTransitionListener()

Method Details

addListener

public void addListener(StateTransitionListener<OPERAND,EVENT,STATE> listener)

Add a listener to the list of listeners.

Parameters:

listener - A listener.

preTransition

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

Description copied from interface: StateTransitionListener

Pre Transition Hook. This will be called before transition.

Specified by:

preTransition in interface StateTransitionListener<OPERAND,EVENT,STATE extends Enum<STATE>>

Parameters:

op - Operand.

beforeState - State before transition.

eventToBeProcessed - Incoming Event.

postTransition

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

Description copied from interface: StateTransitionListener

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

Specified by:

postTransition in interface StateTransitionListener<OPERAND,EVENT,STATE extends Enum<STATE>>

Parameters:

op - Operand.

beforeState - State before transition.

afterState - State after transition.

processedEvent - Processed Event.