Implementing Batch Processing in Java EE 7

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Batch - JavaLand 2014 @ivar_grimstad Implementing Batch Processing in Java EE 7 Ivar Grimstad

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Ivar Grimstad About Batch - JavaLand 2014 @ivar_grimstad @ivar_grimstad

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batch (plural batches) The quantity of bread or other baked goods baked at one time. We made a batch of cookies to take to the party. Batch - JavaLand 2014 @ivar_grimstad Source: http://en.wiktionary.org/wiki/batch

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Batch Applications Batch in Java EE 7 Demo Wrap-Up Content Batch - JavaLand 2014 @ivar_grimstad

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History Batch - JavaLand 2014 @ivar_grimstad

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Batch Applications Batch - JavaLand 2014 @ivar_grimstad

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Bulk database updates Image processing Conversions Common Usages Batch - JavaLand 2014 @ivar_grimstad

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No User Interaction Utilize Batch Windows Repetitive Work Advantages of Batch Processing Batch - JavaLand 2014 @ivar_grimstad

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Training Difficult Debugging Costly Disadvantages of Batch Processing Batch - JavaLand 2014 @ivar_grimstad

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Batch Frameworks To The Rescue Batch - JavaLand 2014 @ivar_grimstad

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Jobs, steps, decision elements, relationships Parallel or sequential processing State Launch, pause and resume Error handling Batch Frameworks Batch - JavaLand 2014 @ivar_grimstad

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Large Data Volume Automation Robustness Reliability Performance Requirements of Batch Applications Batch - JavaLand 2014 @ivar_grimstad

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Batch - JavaLand 2014 @ivar_grimstad Batch Processing in Java EE 7

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Batch Runtime Job Specification Java API – Runtime interaction – Implementation The Batch Processing Framework Batch - JavaLand 2014 @ivar_grimstad

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Start jobs Check status of jobs Batch Runtime Batch - JavaLand 2014 @ivar_grimstad

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Steps Flows Splits Decision Elements Job Specification Batch - JavaLand 2014 @ivar_grimstad

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Job Specification Language (JSL) Batch - JavaLand 2014 @ivar_grimstad ... ... ... ... ...

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Java Batch API (task oriented) Batch - JavaLand 2014 @ivar_grimstad Package Interface Description javax.batch.api Batchlet Implements the business logic of a task-oriented step.

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Java Batch API (chunk oriented) Batch - JavaLand 2014 @ivar_grimstad Package Interface Description javax.batch.api.chunk ItemReader Reads items from an input source in a chunk step. javax.batch.api.chunk ItemProcessor Processes input items to obtain output items in chunk steps. javax.batch.api.chunk ItemWriter Writes output items in chunk steps.

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ItemReader ItemWriter ItemProcessor Chunk Oriented Steps Batch - JavaLand 2014 @ivar_grimstad Item Item

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Dependency Injection Batch - JavaLand 2014 @ivar_grimstad @Dependent @Named("MyItemReader") public class MyItemReaderImpl implements ItemReader { } ...

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Batch Runtime API Batch - JavaLand 2014 @ivar_grimstad @Dependent @Named("MyItemReader") public class MyItemReaderImpl implements ItemReader { @Inject JobContext jobCtx; @Inject StepContext stepCtx; }

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Invocation Batch - JavaLand 2014 @ivar_grimstad jobOperator = BatchRuntime.getJobOperator(); Properties props = new Properties(); props.setProperty("parameter1", "value1"); long execID = jobOperator.start("simplejob", props); EJB, Servlet, ManagedBean etc.

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No separate packaging needed Can be included in any Java EE application – META-INF/batch-jobs/ – WEB-INF/classes/META-INF/batch-jobs/ Packaging Batch - JavaLand 2014 @ivar_grimstad

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Monitoring Batch - JavaLand 2014 @ivar_grimstad Package Interface Description javax.batch.runtime JobExecution Provides methods to obtain information about submitted jobs. JobExecution jobExec = jobOperator.getJobExection(id); String status = jobExec.getBatchStatus().toString();

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Design the application Create batch artifacts Define jobs, steps and execution flow Launch batch application Creating a Java EE Batch Application Batch - JavaLand 2014 @ivar_grimstad

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Batch - JavaLand 2014 @ivar_grimstad DEMO

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Create a simple batchlet Create a simple chunk oriented job Package in a WAR Start jobs from a Servlet Schedule jobs from Timer EJB Demo Steps Batch - JavaLand 2014 @ivar_grimstad

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Simple Batchlet Batch - JavaLand 2014 @ivar_grimstad

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Simple Chunk Oriented Batch - JavaLand 2014 @ivar_grimstad

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Created a simple batchlet Created a simple chunk oriented job Packaged application in a WAR Started jobs from a Servlet Scheduled jobs from Timer EJB Demo Steps (what we did) Batch - JavaLand 2014 @ivar_grimstad

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Batch - JavaLand 2014 @ivar_grimstad Summary

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…but isn’t it? Batch - JavaLand 2014 @ivar_grimstad

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Simple and Flexible Clear and precise API No separate packaging required Is a part of Java EE Summary Batch - JavaLand 2014 @ivar_grimstad

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https://github.com/ivargrimstad/javaee-batch https://github.com/javaee-samples/javaee7-samples Sources Batch - JavaLand 2014 @ivar_grimstad

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Batch - JavaLand 2014 @ivar_grimstad