org.springframework.batch.core.step.builder

Class AbstractTaskletStepBuilder<B extends AbstractTaskletStepBuilder<B>>

java.lang.Object

org.springframework.batch.core.step.builder.StepBuilderHelper<AbstractTaskletStepBuilder<B>>

org.springframework.batch.core.step.builder.AbstractTaskletStepBuilder<B>

Type Parameters:

B - the type of builder represented

Direct Known Subclasses:

SimpleStepBuilder, TaskletStepBuilder

public abstract class AbstractTaskletStepBuilder<B extends AbstractTaskletStepBuilder<B>>
extends StepBuilderHelper<AbstractTaskletStepBuilder<B>>

Base class for step builders that want to build a TaskletStep. Handles common concerns across all tasklet step variants, which are mostly to do with the type of tasklet they carry.

Since:

2.2

Author:

Dave Syer

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.batch.core.step.builder.StepBuilderHelper

StepBuilderHelper.CommonStepProperties

Field Summary

Fields

Modifier and Type	Field and Description
protected Set<ChunkListener>	chunkListeners

Fields inherited from class org.springframework.batch.core.step.builder.StepBuilderHelper

logger, properties

Constructor Summary

Constructors

Constructor and Description
AbstractTaskletStepBuilder(StepBuilderHelper<?> parent)

Method Summary

Methods

Modifier and Type	Method and Description
TaskletStep	build() Build the step from the components collected by the fluent setters.
protected boolean	concurrent() Convenience method for subclasses to determine if the step is concurrent.
protected abstract Tasklet	createTasklet()
AbstractTaskletStepBuilder<B>	exceptionHandler(ExceptionHandler exceptionHandler) Sets the exception handler to use in the case of tasklet failures.
protected ExceptionHandler	getExceptionHandler() Convenience method for subclasses to access the exception handler that was injected by user.
protected RepeatOperations	getStepOperations() Convenience method for subclasses to access the step operations that were injected by user.
AbstractTaskletStepBuilder<B>	listener(ChunkListener listener) Register a chunk listener.
AbstractTaskletStepBuilder<B>	stepOperations(RepeatOperations repeatTemplate) Sets the repeat template used for iterating the tasklet execution.
AbstractTaskletStepBuilder<B>	stream(ItemStream stream) Register a stream for callbacks that manage restart data.
AbstractTaskletStepBuilder<B>	taskExecutor(org.springframework.core.task.TaskExecutor taskExecutor) Provide a task executor to use when executing the tasklet.
AbstractTaskletStepBuilder<B>	throttleLimit(int throttleLimit) In the case of an asynchronous taskExecutor(TaskExecutor) the number of concurrent tasklet executions can be throttled (beyond any throttling provided by a thread pool).
AbstractTaskletStepBuilder<B>	transactionAttribute(org.springframework.transaction.interceptor.TransactionAttribute transactionAttribute) Sets the transaction attributes for the tasklet execution.

Methods inherited from class org.springframework.batch.core.step.builder.StepBuilderHelper

allowStartIfComplete, enhance, getJobRepository, getName, getTransactionManager, isAllowStartIfComplete, listener, listener, repository, startLimit, transactionManager

Methods inherited from class java.lang.Object

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

Field Detail

chunkListeners

protected Set<ChunkListener> chunkListeners

Constructor Detail

AbstractTaskletStepBuilder

public AbstractTaskletStepBuilder(StepBuilderHelper<?> parent)

Method Detail

createTasklet

protected abstract Tasklet createTasklet()

build

public TaskletStep build()

Build the step from the components collected by the fluent setters. Delegates first to StepBuilderHelper.enhance(Step) and then to createTasklet() in subclasses to create the actual tasklet.

Returns:

a tasklet step fully configured and read to execute

listener

public AbstractTaskletStepBuilder<B> listener(ChunkListener listener)

Register a chunk listener.

Parameters:

listener - the listener to register

Returns:

this for fluent chaining

stream

public AbstractTaskletStepBuilder<B> stream(ItemStream stream)

Register a stream for callbacks that manage restart data.

Parameters:

stream - the stream to register

Returns:

this for fluent chaining

taskExecutor

public AbstractTaskletStepBuilder<B> taskExecutor(org.springframework.core.task.TaskExecutor taskExecutor)

Provide a task executor to use when executing the tasklet. Default is to use a single-threaded (synchronous) executor.

Parameters:

taskExecutor - the task executor to register

Returns:

this for fluent chaining

throttleLimit

public AbstractTaskletStepBuilder<B> throttleLimit(int throttleLimit)

In the case of an asynchronous taskExecutor(TaskExecutor) the number of concurrent tasklet executions can be throttled (beyond any throttling provided by a thread pool). The throttle limit should be less than the data source pool size used in the job repository for this step.

Parameters:

throttleLimit - maximium number of concurrent tasklet executions allowed

Returns:

this for fluent chaining

exceptionHandler

public AbstractTaskletStepBuilder<B> exceptionHandler(ExceptionHandler exceptionHandler)

Sets the exception handler to use in the case of tasklet failures. Default is to rethrow everything.

Parameters:

exceptionHandler - the exception handler

Returns:

this for fluent chaining

stepOperations

public AbstractTaskletStepBuilder<B> stepOperations(RepeatOperations repeatTemplate)

Sets the repeat template used for iterating the tasklet execution. By default it will terminate only when the tasklet returns FINISHED (or null).

Parameters:

repeatTemplate - a repeat template with rules for iterating

Returns:

this for fluent chaining

transactionAttribute

public AbstractTaskletStepBuilder<B> transactionAttribute(org.springframework.transaction.interceptor.TransactionAttribute transactionAttribute)

Sets the transaction attributes for the tasklet execution. Defaults to the default values for the transaction manager, but can be manipulated to provide longer timeouts for instance.

Parameters:

transactionAttribute - a transaction attribute set

Returns:

this for fluent chaining

getStepOperations

protected RepeatOperations getStepOperations()

Convenience method for subclasses to access the step operations that were injected by user.

Returns:

the repeat operations used to iterate the tasklet executions

getExceptionHandler

protected ExceptionHandler getExceptionHandler()

Convenience method for subclasses to access the exception handler that was injected by user.

Returns:

the exception handler

concurrent

protected boolean concurrent()

Convenience method for subclasses to determine if the step is concurrent.

Returns:

true if the tasklet is going to be run in multiple threads