Implementing Batch Processing in Java EE 7 Ivar Grimstad

Implementing Batch Processing in Java EE 7 Ivar Grimstad Batch - JavaLand 2014 @ivar_grimstad About Ivar Grimstad @ivar_grimstad Batch - JavaLand 2014 @ivar_grimstad 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. Source: http://en.wiktionary.org/wiki/batch Batch - JavaLand 2014 @ivar_grimstad Content • Batch Applications • Batch in Java EE 7 • Demo • Wrap-Up Batch - JavaLand 2014 @ivar_grimstad History Batch - JavaLand 2014 @ivar_grimstad Batch Applications Batch - JavaLand 2014 @ivar_grimstad Common Usages • Bulk database updates • Image processing • Conversions Batch - JavaLand 2014 @ivar_grimstad Advantages of Batch Processing • No User Interaction • Utilize Batch Windows • Repetitive Work Batch - JavaLand 2014 @ivar_grimstad Disadvantages of Batch Processing • Training • Difficult Debugging • Costly Batch - JavaLand 2014 @ivar_grimstad To The Rescue Batch Frameworks Batch - JavaLand 2014 @ivar_grimstad Batch Frameworks • Jobs, steps, decision elements, relationships • Parallel or sequential processing • State • Launch, pause and resume • Error handling Batch - JavaLand 2014 @ivar_grimstad Requirements of Batch Applications Large Data Volume Automation Robustness Reliability Performance Batch - JavaLand 2014 @ivar_grimstad Batch Processing in Java EE 7 Batch - JavaLand 2014 @ivar_grimstad The Batch Processing Framework • Batch Runtime • Job Specification • Java API – Runtime interaction – Implementation Batch - JavaLand 2014 @ivar_grimstad Batch Runtime • Start jobs • Check status of jobs Batch - JavaLand 2014 @ivar_grimstad Job Specification • Steps • Flows • Splits • Decision Elements Batch - JavaLand 2014 @ivar_grimstad Job Specification Language (JSL) <job> <listeners> <listener /> </listeners> <properties> <property /> </properties> <step ...> ... </step> <step ...> ... </step> <decision ...> ... </decision> <flow ...> ... </flow> <split ...> ... </split> </job> Batch - JavaLand 2014 @ivar_grimstad Java Batch API (task oriented) Package Interface Description Implements the business logic of a task-oriented javax.batch.api Batchlet step. Batch - JavaLand 2014 @ivar_grimstad Java Batch API (chunk oriented) Package Interface Description Reads items from an input source in a javax.batch.api.chunk ItemReader chunk step. Processes input items to obtain output javax.batch.api.chunk ItemProcessor items in chunk steps. javax.batch.api.chunk ItemWriter Writes output items in chunk steps. Batch - JavaLand 2014 @ivar_grimstad Chunk Oriented Steps ItemReaderItem ItemProcessor ItemWriter Batch - JavaLand 2014 @ivar_grimstad Dependency Injection @Dependent @Named("MyItemReader") public class MyItemReaderImpl implements ItemReader { } <step id="stepA" next="stepB"> <chunk> <reader ref="MyItemReader"></reader> ... </chunk> </step> Batch - JavaLand 2014 @ivar_grimstad Batch Runtime API @Dependent @Named("MyItemReader") public class MyItemReaderImpl implements ItemReader { @Inject JobContext jobCtx; @Inject StepContext stepCtx; } Batch - JavaLand 2014 @ivar_grimstad Invocation EJB, Servlet, ManagedBean etc. jobOperator = BatchRuntime.getJobOperator(); Properties props = new Properties(); props.setProperty("parameter1", "value1"); long execID = jobOperator.start("simplejob", props); Batch - JavaLand 2014 @ivar_grimstad Packaging • No separate packaging needed • Can be included in any Java EE application – META-INF/batch-jobs/ – WEB-INF/classes/META-INF/batch-jobs/ Batch - JavaLand 2014 @ivar_grimstad Monitoring Package Interface Description Provides methods to obtain information javax.batch.runtime JobExecution about submitted jobs. JobExecution jobExec = jobOperator.getJobExection(id); String status = jobExec.getBatchStatus().toString(); Batch - JavaLand 2014 @ivar_grimstad Creating a Java EE Batch Application • Design the application • Create batch artifacts • Define jobs, steps and execution flow • Launch batch application Batch - JavaLand 2014 @ivar_grimstad DEMO Batch - JavaLand 2014 @ivar_grimstad Demo Steps • Create a simple batchlet • Create a simple chunk oriented job • Package in a WAR • Start jobs from a Servlet • Schedule jobs from Timer EJB Batch - JavaLand 2014 @ivar_grimstad Simple Batchlet Batch - JavaLand 2014 @ivar_grimstad Simple Chunk Oriented Batch - JavaLand 2014 @ivar_grimstad Demo Steps (what we did) • 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 Batch - JavaLand 2014 @ivar_grimstad Summary Batch - JavaLand 2014 @ivar_grimstad …but isn’t it? Batch - JavaLand 2014 @ivar_grimstad Summary • Simple and Flexible • Clear and precise API • No separate packaging required • Is a part of Java EE Batch - JavaLand 2014 @ivar_grimstad Sources https://github.com/ivargrimstad/javaee-batch Batch - JavaLand 2014 @ivar_grimstad Batch - JavaLand 2014 @ivar_grimstad.

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