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![The
JSR-‐352
• Batch
ApplicaHons
for
the
Java
pla]orm
• Heavily
inspired
by
Spring
Batch
• Available
since
Java
EE
7
• Also
designed
for
Java
SE](https://image.slidesharecdn.com/con2818-javaee7batchprocessingintherealworld-141001120216-phpapp02/85/Java-EE-7-Batch-processing-in-the-Real-World-9-320.jpg)
![ParYYon
DefiniYon
(In
Step)
<chunk
item-‐count="3">
<reader
ref="myItemReader">
<properYes>
<property
name="start”
value="#{parYYonPlan['start']}"
/>
</properYes>
</reader>
<processor
ref="myItemProcessor"/>
<writer
ref="myItemWriter"/>
</chunk>](https://image.slidesharecdn.com/con2818-javaee7batchprocessingintherealworld-141001120216-phpapp02/85/Java-EE-7-Batch-processing-in-the-Real-World-28-320.jpg)
![Decision
@Named
public
class
MyDecider
implements
Decider
{
public
String
decide(StepExecuYon[]
execuYons)
throws
ExcepYon
{…}
}](https://image.slidesharecdn.com/con2818-javaee7batchprocessingintherealworld-141001120216-phpapp02/85/Java-EE-7-Batch-processing-in-the-Real-World-35-320.jpg)
Uploaded byRoberto Cortez
Java EE 7 Batch processing in the Real World
The document discusses Java EE 7 Batch Processing, focusing on the JSR-352 specification which facilitates batch applications in Java by providing features like task-oriented processing, error handling, and parallel execution. It emphasizes the importance of batch processing for efficiency and managing large datasets by using a system of jobs, steps, readers, processors, and writers. Additionally, it includes implementation details and examples, highlighting the use of resources and scheduling for batch jobs.
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Java EE 7 Batch processing in the Real World
- 1. Java EE 7 Batch Processing in the Real World Roberto Cortez & Ivan St. Ivanov JavaOne 2014 #CON2818
- 2. Who are we? Roberto Cortez @radcortez h/p://www.radcortez.com Freelancer, Speaker, RebelLabs Author, Blogger Ivan St. Ivanov @ivan_stefanov h/p://nosoGskills.com Architect, SAP Labs Bulgaria, JBoss Forge contributor
- 3. QuesHons? As soon as you have them!
- 4. What is Batch? “A group of records processed as a single unit, usually without input from a user.” (from Google)
- 5. Why Batch? (Computers) • Make use of idle resources • ShiT the Hme of processing • Manage large repeated work easily • Shared by mulHple users
- 6. Batch is in our lives • By paying bills • On the grocery • In traffic • Cooking food
- 7. Why Batch? (General) • Efficiency • Focus on a single problem • Avoid context switch • Reduce costs
- 8. State of the Art • Spring Batch • IBM Websphere • Hadoop • Java SE, Scheduler, in-‐house frameworks
- 9. The JSR-‐352 •Batch ApplicaHons for the Java pla]orm • Heavily inspired by Spring Batch • Available since Java EE 7 • Also designed for Java SE
- 10. The JSR-‐352 Features • Task and Chunk oriented processing • SequenHal and/or Parallel execuHon • CheckpoinHng • Workflow • Stop and restart • ExcepHon handling
- 11. Batch Domain Language Job Operator Job Step Job Repository Item Reader Item Processor Item Writer 1 *
- 12. Job composiYon * Job Step * JobInstance * * * JobExecuYon StepExecuYon
- 13. Java EE Batch API
- 14. Batchlet DefiniYon @Named public class MyBatchlet extends AbstractBatchlet { @Override public String process() { System.out.println("Running inside a batchlet"); return BatchStatus.COMPLETED.toString(); } }
- 15. Job SpecificaYon Language <job id="myFirstBatch"> <step id="myStep" > <batchlet ref="myBatchlet"/> </step> </job>
- 16. Start the Job JobOperator jobOperator = BatchRunYme.getJobOperator(); Long execuYonId = jobOperator.start("myJob", new ProperYes()); JobExecuYon jobExecuYon = jobOperator.getJobExecuYon(execuYonId);
- 17. Batchlet • Task oriented Batch Step • Suitable for • Short execuHons • Handle system resources • IniHalizaHon and Cleanup
- 18. Chunk • ETL style (Reader, Processor, Writer) • Suitable for • Handle large amounts of data • Failover safety (checkpoint) • Long running applicaHons
- 19. Chunk Processing Step ItemReader ItemProcessor ItemWriter read() read() process(item) process(item) write(items) item item item item execute() ExitStatus
- 20. Defining Chunk Step <step id="myChunk"> <chunk checkpoint-‐policy="item" item-‐count="3"> <reader ref=“myItemReader"/> <processor ref=“myItemProcessor"/> <writer ref=“myItemWriter"/> </chunk> </step>
- 21. Item Reader @Named public class MyItemReader extends AbstractItemReader { public Object readItem() throws ExcepYon {…} }
- 22. Item Processor @Named public class MyItemProcessor implements ItemProcessor { public Object processItem(Object item) throws ExcepYon {…} }
- 23. Item Writer @Named public class MyItemWriter extends AbstractItemWriter { public void writeItems(List<Object> items) throws ExcepYon {…} }
- 24. ExcepYon Handling •Job ExecuHon Fails on ExcepHon • Possible to Skip or Retry ExcepHons • Applied to the Chunk • Include or Exclude ExcepHons
- 25. ExcepYon Handling DefiniYon <chunk checkpoint-‐policy="item” item-‐count="3" skip-‐limit="3" retry-‐limit="3"> <reader ref="myItemReader"/> <processor ref="myItemProcessor"/> <writer ref="myItemWriter"/> <skippable-‐excepYon-‐classes> <include class="java.lang.RunYmeExcepYon"/> </skippable-‐excepYon-‐classes> <retryable-‐excepYon-‐classes> <exclude class="java.lang.IllegalArgumentExcepYon"/> </retryable-‐excepYon-‐classes> </chunk>
- 26. ParYYon • Steps run on mulHple Threads • One ParHHon per Thread • Define ParHHon Plan • CheckpoinHng is independent per Thread
- 27. ParYYon DefiniYon (In Step) <parYYon> <plan parYYons="2"> <properYes parYYon="0"> <property name="start" value="1"/> </properYes> <properYes parYYon="1"> <property name="start" value="11"/> </properYes> </plan> </parYYon>
- 28. ParYYon DefiniYon (In Step) <chunk item-‐count="3"> <reader ref="myItemReader"> <properYes> <property name="start” value="#{parYYonPlan['start']}" /> </properYes> </reader> <processor ref="myItemProcessor"/> <writer ref="myItemWriter"/> </chunk>
- 29. Flow • Sequence of ExecuHon elements • Execute together as a unit • Flows, Steps, Decision and Split • Used to aggregate logical business.
- 30. Split • Concurrent ExecuHon of Flows • Each Flow run on a separate Thread • Is not the same as a ParHHon • Can only use Flows
- 31. Split and Flow DefiniYon <split id="mySplit"> <flow id="flow1"> <step id="myChunk" next="myBatchlet”>…</step> <step id="myBatchlet">...</step> </flow> <flow id="flow2"> <step id=”otherChunk" next=”otherBatchlet”>…</step> <step id=”otherBatchlet">...</step> </flow> </split>
- 32. ParYYon vs Split • ParHHon is used at the data level • Split is used at the business level
- 33. Decision • Decide the next TransiHon • Applied to Steps, Flows and Splits • It’s almost like an if / else if • Requires an implementaHon
- 34. Decision DefiniYon <step id=”myStep" next="myDecider"> <batchlet ref="myBatchlet”/> </step> <decision id="myDecider" ref="MyDecider"> <next on="foo" to="myFooStep"/> <next on="bar" to="myBarStep"/> </decision>
- 35. Decision @Named public class MyDecider implements Decider { public String decide(StepExecuYon[] execuYons) throws ExcepYon {…} }
- 36. TransiYons • TransiHon Elements define the Workflow • Applied to Steps, Flows and Decision • Next, Fail, End, Stop • Fail, End and Stop terminate a Job
- 37. Batch Exit Status • A Job and Steps has an Exit Status • Used to control the Workflow • STARTING, STARTED, STOPPING, STOPPED, FAILED, COMPLETED, ABANDONED
- 38. Schedule a Job (By @Schedule) @Singleton public class BatchJobRunner { @Schedule(dayOfWeek = "Sun") public void scheduleJob() { JobOperator jobOperator = BatchRunYme.getJobOperator(); jobOperator.start("myJob", new ProperYes()); } }
- 39. Schedule a Job (By ManagedScheduledExecutorService) @Resource(lookup="java:comp/DefaultManagedScheduledExecutorService") private ManagedScheduledExecutorService executor; public void scheduleJob() { JobOperator jobOperator = BatchRunYme.getJobOperator(); executor.schedule( () -‐> jobOperator.start("myJob", new ProperYes()), 7, TimeUnit.DAYS); }
- 40. ImplementaYons • JBatch IBM (Glassfish, JEUS) • JBeret (Wildfly) • Spring Batch
- 41. A Few Cons • Lacks standard Readers / Writers • No Generics • ParHHon only supports a single Step • No Sync mode
- 42.
- 43. WoW AucYon House • World of WacraT is MMORPG • More than 500 servers in US and EU • Each server has 2 AucHon Houses • Trades around 70k items / server / hour
- 44. WoW AucYon House • Data available to download • Let’s process the data • Extract metrics • Share the knowledge
- 45.
- 46. Resources • JSR-‐352 SpecificaHon hips://jcp.org/en/jsr/detail?id=352 • Java EE Samples hips://github.com/javaee-‐samples • Wow AucHon House hips://github.com/radcortez/wow-‐aucHons
- 47. Thank you for A/ending! Roberto Cortez @radcortez h/p://www.radcortez.com Ivan St. Ivanov @ivan_stefanov h/p://nosoGskills.com