org.springframework.batch.core.job

Class AbstractJob

java.lang.Object

org.springframework.batch.core.job.AbstractJob

All Implemented Interfaces:

Job, StepLocator, org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanNameAware, org.springframework.beans.factory.InitializingBean

Direct Known Subclasses:

FlowJob, SimpleJob

public abstract class AbstractJob
extends java.lang.Object
implements Job, StepLocator, org.springframework.beans.factory.BeanNameAware, org.springframework.beans.factory.InitializingBean

Abstract implementation of the Job interface. Common dependencies such as a JobRepository, JobExecutionListeners, and various configuration parameters are set here. Therefore, common error handling and listener calling activities are abstracted away from implementations.

Author:

Lucas Ward, Dave Syer

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.commons.logging.Log	logger

Constructor Summary

Constructors

Constructor and Description
AbstractJob() Default constructor.
AbstractJob(java.lang.String name) Convenience constructor to immediately add name (which is mandatory but not final).

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Assert mandatory properties: JobRepository.
protected abstract void	doExecute(JobExecution execution) Extension point for subclasses allowing them to concentrate on processing logic and ignore listeners and repository calls.
void	execute(JobExecution execution) Run the specified job, handling all listener and repository calls, and delegating the actual processing to doExecute(JobExecution).
protected ExitStatus	getDefaultExitStatusForFailure(java.lang.Throwable ex, JobExecution execution) Default mapping from throwable to ExitStatus.
JobParametersIncrementer	getJobParametersIncrementer() If clients need to generate new parameters for the next execution in a sequence they can use this incrementer.
JobParametersValidator	getJobParametersValidator() A validator for the job parameters of a JobExecution.
protected JobRepository	getJobRepository() Convenience method for subclasses to access the job repository.
java.lang.String	getName()
abstract Step	getStep(java.lang.String stepName) Retrieve the step with the given name.
abstract java.util.Collection<java.lang.String>	getStepNames() Retrieve the step names.
protected StepExecution	handleStep(Step step, JobExecution execution) Convenience method for subclasses to delegate the handling of a specific step in the context of the current JobExecution.
boolean	isRestartable() Flag to indicate if this job can be restarted, at least in principle.
void	registerJobExecutionListener(JobExecutionListener listener) Register a single listener for the JobExecutionListener callbacks.
void	setBeanName(java.lang.String name) Set the name property if it is not already set.
void	setJobExecutionListeners(JobExecutionListener[] listeners) Public setter for injecting JobExecutionListeners.
void	setJobParametersIncrementer(JobParametersIncrementer jobParametersIncrementer) Public setter for the JobParametersIncrementer.
void	setJobParametersValidator(JobParametersValidator jobParametersValidator) A validator for job parameters.
void	setJobRepository(JobRepository jobRepository) Public setter for the JobRepository that is needed to manage the state of the batch meta domain (jobs, steps, executions) during the life of a job.
void	setName(java.lang.String name) Set the name property.
void	setRestartable(boolean restartable) Boolean flag to prevent categorically a job from restarting, even if it has failed previously.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final org.apache.commons.logging.Log logger

Constructor Detail

AbstractJob

public AbstractJob()

Default constructor.

AbstractJob

public AbstractJob(java.lang.String name)

Convenience constructor to immediately add name (which is mandatory but not final).

Parameters:

name -

Method Detail

setJobParametersValidator

public void setJobParametersValidator(JobParametersValidator jobParametersValidator)

A validator for job parameters. Defaults to a vanilla DefaultJobParametersValidator.

Parameters:

jobParametersValidator - a validator instance

afterPropertiesSet

public void afterPropertiesSet()
                        throws java.lang.Exception

Assert mandatory properties: JobRepository.

Specified by:

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

Throws:

java.lang.Exception

See Also:

InitializingBean.afterPropertiesSet()

setBeanName

public void setBeanName(java.lang.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)

setName

public void setName(java.lang.String name)

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

See Also:

setBeanName(java.lang.String)

getName

public java.lang.String getName()

Specified by:

getName in interface Job

getStep

public abstract Step getStep(java.lang.String stepName)

Retrieve the step with the given name. If there is no Step with the given name, then return null.

Specified by:

getStep in interface StepLocator

Parameters:

stepName -

Returns:

the Step

getStepNames

public abstract java.util.Collection<java.lang.String> getStepNames()

Retrieve the step names.

Specified by:

getStepNames in interface StepLocator

Returns:

the step names

getJobParametersValidator

public JobParametersValidator getJobParametersValidator()

Description copied from interface: Job

A validator for the job parameters of a JobExecution. Clients of a Job may need to validate the parameters for a launch, before or during the execution.

Specified by:

getJobParametersValidator in interface Job

Returns:

a validator that can be used to check parameter values (never null)

setRestartable

public void setRestartable(boolean restartable)

Boolean flag to prevent categorically a job from restarting, even if it has failed previously.

Parameters:

restartable - the value of the flag to set (default true)

isRestartable

public boolean isRestartable()

Description copied from interface: Job

Flag to indicate if this job can be restarted, at least in principle.

Specified by:

isRestartable in interface Job

Returns:

true if this job can be restarted after a failure

See Also:

Job.isRestartable()

setJobParametersIncrementer

public void setJobParametersIncrementer(JobParametersIncrementer jobParametersIncrementer)

Public setter for the JobParametersIncrementer.

Parameters:

jobParametersIncrementer - the JobParametersIncrementer to set

getJobParametersIncrementer

public JobParametersIncrementer getJobParametersIncrementer()

Description copied from interface: Job

If clients need to generate new parameters for the next execution in a sequence they can use this incrementer. The return value may be null, in the case that this job does not have a natural sequence.

Specified by:

getJobParametersIncrementer in interface Job

Returns:

in incrementer to be used for creating new parameters

setJobExecutionListeners

public void setJobExecutionListeners(JobExecutionListener[] listeners)

Public setter for injecting JobExecutionListeners. They will all be given the listener callbacks at the appropriate point in the job.

Parameters:

listeners - the listeners to set.

registerJobExecutionListener

public void registerJobExecutionListener(JobExecutionListener listener)

Register a single listener for the JobExecutionListener callbacks.

Parameters:

listener - a JobExecutionListener

setJobRepository

public void setJobRepository(JobRepository jobRepository)

Public setter for the JobRepository that is needed to manage the state of the batch meta domain (jobs, steps, executions) during the life of a job.

Parameters:

jobRepository -

getJobRepository

protected JobRepository getJobRepository()

Convenience method for subclasses to access the job repository.

Returns:

the jobRepository

doExecute

protected abstract void doExecute(JobExecution execution)
                           throws JobExecutionException

Extension point for subclasses allowing them to concentrate on processing logic and ignore listeners and repository calls. Implementations usually are concerned with the ordering of steps, and delegate actual step processing to handleStep(Step, JobExecution).

Parameters:

execution - the current JobExecution

Throws:

JobExecutionException - to signal a fatal batch framework error (not a business or validation exception)

execute

public final void execute(JobExecution execution)

Run the specified job, handling all listener and repository calls, and delegating the actual processing to doExecute(JobExecution).

Specified by:

execute in interface Job

Parameters:

execution - a JobExecution

Throws:

StartLimitExceededException - if start limit of one of the steps was exceeded

See Also:

Job.execute(JobExecution)

handleStep

protected final StepExecution handleStep(Step step,
                                         JobExecution execution)
                                  throws JobInterruptedException,
                                         JobRestartException,
                                         StartLimitExceededException

Convenience method for subclasses to delegate the handling of a specific step in the context of the current JobExecution. Clients of this method do not need access to the JobRepository, nor do they need to worry about populating the execution context on a restart, nor detecting the interrupted state (in job or step execution).

Parameters:

step - the Step to execute

execution - the current JobExecution

Returns:

the StepExecution corresponding to this step

Throws:

JobInterruptedException - if the JobExecution has been interrupted, and in particular if BatchStatus.ABANDONED or BatchStatus.STOPPING is detected

StartLimitExceededException - if the start limit has been exceeded for this step

JobRestartException - if the job is in an inconsistent state from an earlier failure

getDefaultExitStatusForFailure

protected ExitStatus getDefaultExitStatusForFailure(java.lang.Throwable ex,
                                                    JobExecution execution)

Default mapping from throwable to ExitStatus.

Parameters:

ex - the cause of the failure

Returns:

an ExitStatus

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object