org.springframework.batch.repeat.exception
Class RethrowOnThresholdExceptionHandler

java.lang.Object
  org.springframework.batch.repeat.exception.RethrowOnThresholdExceptionHandler

All Implemented Interfaces:

ExceptionHandler

public class RethrowOnThresholdExceptionHandler
extends Object
implements ExceptionHandler

Implementation of ExceptionHandler that rethrows when exceptions of a given type reach a threshold. Requires an Classifier that maps exception types to unique keys, and also a map from those keys to threshold values (Integer type).

Author:

Dave Syer

Field Summary

protected Log	logger
protected static org.springframework.batch.repeat.exception.RethrowOnThresholdExceptionHandler.IntegerHolder	ZERO

Constructor Summary

RethrowOnThresholdExceptionHandler()
Set up the exception handler.

Method Summary

void	handleException(RepeatContext context, Throwable throwable) Classify the throwables and decide whether to re-throw based on the result.
void	setThresholds(Map<Class<? extends Throwable>,Integer> thresholds) A map from exception classes to a threshold value of type Integer.
void	setUseParent(boolean useParent) Flag to indicate the the exception counters should be shared between sibling contexts in a nested batch.

Methods inherited from class java.lang.Object

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

Field Detail

ZERO

protected static final org.springframework.batch.repeat.exception.RethrowOnThresholdExceptionHandler.IntegerHolder ZERO

logger

protected final Log logger

Constructor Detail

RethrowOnThresholdExceptionHandler

public RethrowOnThresholdExceptionHandler()

Set up the exception handler. Creates a default exception handler and threshold that maps all exceptions to a threshold of 0 - all exceptions are rethrown by default.

Method Detail

setUseParent

public void setUseParent(boolean useParent)

Flag to indicate the the exception counters should be shared between sibling contexts in a nested batch. Default is false.

Parameters:

useParent - true if the parent context should be used to store the counters.

setThresholds

public void setThresholds(Map<Class<? extends Throwable>,Integer> thresholds)

A map from exception classes to a threshold value of type Integer.

Parameters:

thresholds - the threshold value map.

handleException

public void handleException(RepeatContext context,
                            Throwable throwable)
                     throws Throwable

Classify the throwables and decide whether to re-throw based on the result. The context is used to accumulate the number of exceptions of the same type according to the classifier.

Specified by:

handleException in interface ExceptionHandler

Parameters:

context - the current RepeatContext. Can be used to store state (via attributes), for example to count the number of occurrences of a particular exception type and implement a threshold policy.

throwable - an exception.

Throws:

Throwable

See Also:

ExceptionHandler.handleException(RepeatContext, Throwable)