org.axonframework.eventhandling

Enum PropagatingErrorHandler

java.lang.Object

java.lang.Enum<PropagatingErrorHandler>

org.axonframework.eventhandling.PropagatingErrorHandler

All Implemented Interfaces:

Serializable, Comparable<PropagatingErrorHandler>, ErrorHandler, ListenerInvocationErrorHandler

public enum PropagatingErrorHandler
extends Enum<PropagatingErrorHandler>
implements ErrorHandler, ListenerInvocationErrorHandler

Singleton ErrorHandler implementation that does not do anything.

Author:

Rene de Waele

Enum Constant Summary

Enum Constants

Enum Constant and Description
INSTANCE Singleton instance of a PropagatingErrorHandler.

Method Summary

Modifier and Type	Method and Description
void	handleError(ErrorContext errorContext) Handle an error raised during event processing.
static PropagatingErrorHandler	instance() Singleton instance of a PropagatingErrorHandler.
void	onError(Exception exception, EventMessage<?> event, EventListener eventListener) Invoked after given eventListener failed to handle given event.
static PropagatingErrorHandler	valueOf(String name) Returns the enum constant of this type with the specified name.
static PropagatingErrorHandler[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

INSTANCE

public static final PropagatingErrorHandler INSTANCE

Singleton instance of a PropagatingErrorHandler.

Method Detail

values

public static PropagatingErrorHandler[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (PropagatingErrorHandler c : PropagatingErrorHandler.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static PropagatingErrorHandler valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

instance

public static PropagatingErrorHandler instance()

Singleton instance of a PropagatingErrorHandler.

Returns:

the singleton instance of PropagatingErrorHandler

onError

public void onError(Exception exception,
                    EventMessage<?> event,
                    EventListener eventListener)
             throws Exception

Description copied from interface: ListenerInvocationErrorHandler

Invoked after given eventListener failed to handle given event. Implementations have a choice of options for how to continue:

• To ignore this error no special action is required. Processing will continue for this and subsequent events.
• To retry processing the event, implementations can re-invoke EventListener.handle(EventMessage) on the eventListener once or multiple times.
• To terminate event handling altogether and stop propagating the event to other listeners implementations may throw an exception.

Specified by:

onError in interface ListenerInvocationErrorHandler

Parameters:

exception - The exception thrown by the given eventListener

event - The event that triggered the exception

eventListener - The listener that failed to handle given event

Throws:

Exception - To stop further handling of the event

handleError

public void handleError(ErrorContext errorContext)
                 throws Exception

Description copied from interface: ErrorHandler

Handle an error raised during event processing. Generally this means that the UnitOfWork created to coordinate the event processing was rolled back. Using default configuration the ErrorHandler is only invoked when there is a serious error, for instance when the database transaction connected to the UnitOfWork can not be committed.

The error handler has the option to simply log or ignore the error. Depending on the type of EventProcessor this will put an end to the processing of any further events (in case of a TrackingEventProcessor) or simply skip over the list of given failedEvents.

Note that although the UnitOfWork and hence any related database transactions have been rolled back when the error handler is invoked, the processing of one or more of the failedEvents may in fact have caused other side effects which could not be reverted.

Specified by:

handleError in interface ErrorHandler

Parameters:

errorContext - Contextual information describing the error

Throws:

Exception - if the handler decides to propagate the error