org.springframework.batch.core.resource

Class StepExecutionSimpleCompletionPolicy

java.lang.Object

org.springframework.batch.core.listener.StepExecutionListenerSupport

org.springframework.batch.core.resource.StepExecutionSimpleCompletionPolicy

All Implemented Interfaces:

StepExecutionListener, StepListener, CompletionPolicy

public class StepExecutionSimpleCompletionPolicy
extends StepExecutionListenerSupport
implements CompletionPolicy

A CompletionPolicy that picks up a commit interval from JobParameters by listening to the start of a step. Use anywhere that a CompletionPolicy can be used (usually at the chunk level in a step), and inject as a StepExecutionListener into the surrounding step. N.B. only after the step has started will the completion policy be usable.

It is easier and probably preferable to simply declare the chunk with a commit-interval that is a late-binding expression (e.g. #{jobParameters['commit.interval']}). That feature is available from of Spring Batch 2.1.7.

Author:

Dave Syer

See Also:

CompletionPolicy

Constructor Summary

Constructors

Constructor and Description
StepExecutionSimpleCompletionPolicy()

Method Summary

Modifier and Type	Method and Description
void	beforeStep(StepExecution stepExecution) Set up a SimpleCompletionPolicy with a commit interval taken from the JobParameters.
boolean	isComplete(RepeatContext context) Allow policy to signal completion according to internal state, without having to wait for the callback to complete.
boolean	isComplete(RepeatContext context, RepeatStatus result) Determine whether a batch is complete given the latest result from the callback.
void	setKeyName(java.lang.String keyName) Public setter for the key name of a Long value in the JobParameters that will contain a commit interval.
RepeatContext	start(RepeatContext parent) Create a new context for the execution of a batch.
java.lang.String	toString() Delegates to the wrapped CompletionPolicy if set, otherwise returns the value of setKeyName(String).
void	update(RepeatContext context) Give implementations the opportunity to update the state of the current batch.

Methods inherited from class org.springframework.batch.core.listener.StepExecutionListenerSupport

afterStep

Methods inherited from class java.lang.Object

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

Constructor Detail

StepExecutionSimpleCompletionPolicy

public StepExecutionSimpleCompletionPolicy()

Method Detail

setKeyName

public void setKeyName(java.lang.String keyName)

Public setter for the key name of a Long value in the JobParameters that will contain a commit interval. Defaults to "commit.interval".

Parameters:

keyName - the keyName to set

beforeStep

public void beforeStep(StepExecution stepExecution)

Set up a SimpleCompletionPolicy with a commit interval taken from the JobParameters. If there is a Long parameter with the given key name, the intValue of this parameter is used. If not an exception will be thrown.

Specified by:

beforeStep in interface StepExecutionListener

Overrides:

beforeStep in class StepExecutionListenerSupport

Parameters:

stepExecution - instance of StepExecution.

See Also:

StepExecutionListenerSupport.beforeStep(org.springframework.batch.core.StepExecution)

isComplete

public boolean isComplete(RepeatContext context,
                          RepeatStatus result)

Description copied from interface: CompletionPolicy

Determine whether a batch is complete given the latest result from the callback. If this method returns true then CompletionPolicy.isComplete(RepeatContext) should also (but not necessarily vice versa, since the answer here depends on the result).

Specified by:

isComplete in interface CompletionPolicy

Parameters:

context - the current batch context.

result - the result of the latest batch item processing.

Returns:

true if the commit interval has been reached or the result indicates completion

See Also:

CompletionPolicy.isComplete(RepeatContext, RepeatStatus)

isComplete

public boolean isComplete(RepeatContext context)

Description copied from interface: CompletionPolicy

Allow policy to signal completion according to internal state, without having to wait for the callback to complete.

Specified by:

isComplete in interface CompletionPolicy

Parameters:

context - the current batch context.

Returns:

if the commit interval has been reached

See Also:

CompletionPolicy.isComplete(org.springframework.batch.repeat.RepeatContext)

start

public RepeatContext start(RepeatContext parent)

Description copied from interface: CompletionPolicy

Create a new context for the execution of a batch. N.B. implementations should not return the parent from this method - they must create a new context to meet the specific needs of the policy. The best way to do this might be to override an existing implementation and use the RepeatContext to store state in its attributes.

Specified by:

start in interface CompletionPolicy

Parameters:

parent - the current context if one is already in progress.

Returns:

a new RepeatContext

See Also:

CompletionPolicy.start(org.springframework.batch.repeat.RepeatContext)

update

public void update(RepeatContext context)

Description copied from interface: CompletionPolicy

Give implementations the opportunity to update the state of the current batch. Will be called once per callback, after it has been launched, but not necessarily after it completes (if the batch is asynchronous).

Specified by:

update in interface CompletionPolicy

Parameters:

context - the value returned by start.

See Also:

CompletionPolicy.update(org.springframework.batch.repeat.RepeatContext)

toString

public java.lang.String toString()

Delegates to the wrapped CompletionPolicy if set, otherwise returns the value of setKeyName(String).

Overrides:

toString in class java.lang.Object