org.springframework.batch.core.step

Class AbstractStep

java.lang.Object

org.springframework.batch.core.step.AbstractStep

All Implemented Interfaces:

Step, org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanNameAware, org.springframework.beans.factory.InitializingBean

Direct Known Subclasses:

FlowStep, JobStep, PartitionStep, TaskletStep

public abstract class AbstractStep
extends Object
implements Step, org.springframework.beans.factory.InitializingBean, org.springframework.beans.factory.BeanNameAware

A Step implementation that provides common behavior to subclasses, including registering and calling listeners.

Author:

Dave Syer, Ben Hale, Robert Kasanicky

Constructor Summary

Constructors

Constructor and Description
AbstractStep() Default constructor.
AbstractStep(String name) Convenient constructor for setting only the name property.

Method Summary

Methods

Modifier and Type	Method and Description
void	afterPropertiesSet()
protected void	close(ExecutionContext ctx) Extension point for subclasses to provide callbacks to their collaborators at the end of a step (right at the end of the finally block), to close or release resources.
protected abstract void	doExecute(StepExecution stepExecution) Extension point for subclasses to execute business logic.
void	execute(StepExecution stepExecution) Template method for step execution logic - calls abstract methods for resource initialization ( open(ExecutionContext)), execution logic (doExecute(StepExecution)) and resource closing ( close(ExecutionContext)).
protected StepExecutionListener	getCompositeListener()
protected JobRepository	getJobRepository()
String	getName()
int	getStartLimit()
boolean	isAllowStartIfComplete()
protected void	open(ExecutionContext ctx) Extension point for subclasses to provide callbacks to their collaborators at the beginning of a step, to open or acquire resources.
void	registerStepExecutionListener(StepExecutionListener listener) Register a step listener for callbacks at the appropriate stages in a step execution.
void	setAllowStartIfComplete(boolean allowStartIfComplete) Public setter for flag that determines whether the step should start again if it is already complete.
void	setBeanName(String name) Set the name property if it is not already set.
void	setJobRepository(JobRepository jobRepository) Public setter for JobRepository.
void	setName(String name) Set the name property.
void	setStartLimit(int startLimit) Public setter for the startLimit.
void	setStepExecutionListeners(StepExecutionListener[] listeners) Register each of the objects as listeners.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractStep

public AbstractStep()

Default constructor.

AbstractStep

public AbstractStep(String name)

Convenient constructor for setting only the name property.

Parameters:

name -

Method Detail

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Specified by:

afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean

Throws:

Exception

getName

public String getName()

Specified by:

getName in interface Step

Returns:

the name of this step.

setName

public void setName(String name)

Set the name property. Always overrides the default value if this object is a Spring bean.

See Also:

setBeanName(java.lang.String)

setBeanName

public void setBeanName(String name)

Set the name property if it is not already set. Because of the order of the callbacks in a Spring container the name property will be set first if it is present. Care is needed with bean definition inheritance - if a parent bean has a name, then its children need an explicit name as well, otherwise they will not be unique.

Specified by:

setBeanName in interface org.springframework.beans.factory.BeanNameAware

See Also:

BeanNameAware.setBeanName(java.lang.String)

getStartLimit

public int getStartLimit()

Specified by:

getStartLimit in interface Step

Returns:

the number of times a job can be started with the same identifier.

setStartLimit

public void setStartLimit(int startLimit)

Public setter for the startLimit.

Parameters:

startLimit - the startLimit to set

isAllowStartIfComplete

public boolean isAllowStartIfComplete()

Specified by:

isAllowStartIfComplete in interface Step

Returns:

true if a step that is already marked as complete can be started again.

setAllowStartIfComplete

public void setAllowStartIfComplete(boolean allowStartIfComplete)

Public setter for flag that determines whether the step should start again if it is already complete. Defaults to false.

Parameters:

allowStartIfComplete - the value of the flag to set

doExecute

protected abstract void doExecute(StepExecution stepExecution)
                           throws Exception

Extension point for subclasses to execute business logic. Subclasses should set the ExitStatus on the StepExecution before returning.

Parameters:

stepExecution - the current step context

Throws:

Exception

open

protected void open(ExecutionContext ctx)
             throws Exception

Extension point for subclasses to provide callbacks to their collaborators at the beginning of a step, to open or acquire resources. Does nothing by default.

Parameters:

ctx - the ExecutionContext to use

Throws:

Exception

close

protected void close(ExecutionContext ctx)
              throws Exception

Extension point for subclasses to provide callbacks to their collaborators at the end of a step (right at the end of the finally block), to close or release resources. Does nothing by default.

Parameters:

ctx - the ExecutionContext to use

Throws:

Exception

execute

public final void execute(StepExecution stepExecution)
                   throws JobInterruptedException,
                          UnexpectedJobExecutionException

Template method for step execution logic - calls abstract methods for resource initialization ( open(ExecutionContext)), execution logic (doExecute(StepExecution)) and resource closing ( close(ExecutionContext)).

Specified by:

execute in interface Step

Parameters:

stepExecution - an entity representing the step to be executed

Throws:

JobInterruptedException - if the step is interrupted externally

UnexpectedJobExecutionException

registerStepExecutionListener

public void registerStepExecutionListener(StepExecutionListener listener)

Register a step listener for callbacks at the appropriate stages in a step execution.

Parameters:

listener - a StepExecutionListener

setStepExecutionListeners

public void setStepExecutionListeners(StepExecutionListener[] listeners)

Register each of the objects as listeners.

Parameters:

listeners - an array of listener objects of known types.

getCompositeListener

protected StepExecutionListener getCompositeListener()

Returns:

composite listener that delegates to all registered listeners.

setJobRepository

public void setJobRepository(JobRepository jobRepository)

Public setter for JobRepository.

Parameters:

jobRepository - is a mandatory dependence (no default).

getJobRepository

protected JobRepository getJobRepository()

toString

public String toString()

Overrides:

toString in class Object