org.springframework.batch.repeat.exception
Class SimpleLimitExceptionHandler

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

All Implemented Interfaces:

ExceptionHandler, InitializingBean

public class SimpleLimitExceptionHandler
extends Object
implements ExceptionHandler, InitializingBean

Simple implementation of exception handler which looks for given exception types. If one of the types is found then a counter is incremented and the limit is checked to determine if it has been exceeded and the Throwable should be re-thrown. Also allows to specify list of 'fatal' exceptions that are never subject to counting, but are immediately re-thrown. The fatal list has higher priority so the two lists needn't be exclusive.

Author:

Dave Syer, Robert Kasanicky

Constructor Summary

SimpleLimitExceptionHandler()
Default constructor for the SimpleLimitExceptionHandler.

SimpleLimitExceptionHandler(int limit)
Convenience constructor for the SimpleLimitExceptionHandler to set the limit.

Method Summary

void	afterPropertiesSet() Apply the provided properties to create a delegate handler.
void	handleException(RepeatContext context, Throwable throwable) Rethrows only if the limit is breached for this context on the exception type specified.
void	setExceptionClasses(Collection<Class<? extends Throwable>> classes) Setter for the exception classes that this handler counts.
void	setFatalExceptionClasses(Collection<Class<? extends Throwable>> fatalExceptionClasses) Setter for the exception classes that shouldn't be counted, but rethrown immediately.
void	setLimit(int limit) The limit on the given exception type within a single context before it is rethrown.
void	setUseParent(boolean useParent) Flag to indicate the the exception counters should be shared between sibling contexts in a nested batch (i.e. inner loop).

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleLimitExceptionHandler

public SimpleLimitExceptionHandler(int limit)

Convenience constructor for the SimpleLimitExceptionHandler to set the limit.

Parameters:

limit - the limit

SimpleLimitExceptionHandler

public SimpleLimitExceptionHandler()

Default constructor for the SimpleLimitExceptionHandler.

Method Detail

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Apply the provided properties to create a delegate handler.

Specified by:

afterPropertiesSet in interface InitializingBean

Throws:

Exception

See Also:

InitializingBean.afterPropertiesSet()

setUseParent

public void setUseParent(boolean useParent)

Flag to indicate the the exception counters should be shared between sibling contexts in a nested batch (i.e. inner loop). Default is false. Set this flag to true if you want to count exceptions for the whole (outer) loop in a typical container.

Parameters:

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

handleException

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

Rethrows only if the limit is breached for this context on the exception type specified.

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 - implementations are free to re-throw the exception

See Also:

setExceptionClasses(Collection), setLimit(int), ExceptionHandler.handleException(org.springframework.batch.repeat.RepeatContext, Throwable)

setLimit

public void setLimit(int limit)

The limit on the given exception type within a single context before it is rethrown.

Parameters:

limit - the limit

setExceptionClasses

public void setExceptionClasses(Collection<Class<? extends Throwable>> classes)

Setter for the exception classes that this handler counts. Defaults to Exception. If more exceptionClasses are specified handler uses single counter that is incremented when one of the recognized exception exceptionClasses is handled.

Parameters:

classes - exceptionClasses

setFatalExceptionClasses

public void setFatalExceptionClasses(Collection<Class<? extends Throwable>> fatalExceptionClasses)

Setter for the exception classes that shouldn't be counted, but rethrown immediately. This list has higher priority than setExceptionClasses(Collection).

Parameters:

fatalExceptionClasses - defaults to Error