Uploaded byNaresh Chintalcheru
Design & Develop Batch Applications in Java/JEE
Batch applications are programs that run without human intervention to process large amounts of data. They are characterized by non-interactive processing, large input sizes, and long transaction times. Common examples of batch processing include payroll, billing, reporting, and analytics jobs. A batch application is made up of jobs that contain steps. Each step uses a reader to input data, a processor to apply logic, and a writer to output results. Batch applications are well-suited for data-intensive tasks like ETL and can take advantage of off-peak hours. Frameworks like Java Batch and Spring Batch provide models and APIs for developing batch jobs in Java/JEE environments.
Design & Develop Batch Applications in Java/JEE
- 1. Design & Develop BatchApplications in Java/JEE -Naresh Chintalcheru
- 2. What are BatchApplications ? ● Execution of a series of programs ("jobs") without manual intervention ● Conducting a group of computer tasks at one time Batch Applications
- 3. The input datais pre-selected through scripts, command-line parameters or Job- control language Batch Applications
- 4. ● No userintervention ● No UI or minimal UI ● Need not be high available ● Single machine based processing ● Larger Input data ● System latency is not an issue ● Transactions run for long time Batch Processing vs Online Processing ● Interacting with System ● Command-line based UI or GUI interface ● High availability ● Distributed processing ● Smaller Input data ● System response time is critical ● Short transaction time
- 5. Benefits of BatchProcessing
- 6. ● Shift thetime of job processing to when the computing resources are less busy. (e.g., Nightly, Weekly or Monthly Jobs) ● Avoids idling the computing resources with minute- by-minute manual intervention and supervision. ● Manage large volume of transactions ● Long running application Benefits of Batch Processing
- 7. ● Payroll Processing ●Bank monthly statements ● Credit card companies processing bills ● Fraud detection system ● Extract Transform Load Data processing ● Business Intelligence or Social Intelligence Reporting ● Predictive or Risk analysis systems Examples Of Batch Processing
- 8. ● Data intensiveB2B Applications ● Conversion Applications ● Low Response Time Application ● Extract/Update Application ● Mostly Sequential ● Image Processing Applications ● Bulk processing Batch Processing Strategies
- 9. ● File-driven applicationsare driven by records or values retrieved from a file ● Database-driven applications are driven by rows or values retrieved from the database ● Message-driven applications are driven by messages retrieved from a message queue Batch App Categories
- 10. ● Normal processingin a batch window during off-line ● Concurrent batch & on-line processing ● Parallel processing of many different batch runs or jobs at the same time ● Partitioning (i.e. processing of many instances of the same job at the same time) Processing Options
- 11. ● Simple BatchRepeat ● Automatic Retry After Failure ● Commit Batch Process Periodically: chunk processing ● Asynchronous Chunk Processing: parallel processing within a chunk. ● Copy File to File in a Batch ● Massively Parallel Batch Processing ● Manual Restart After Failure ● Sequential Processing of Dependent Steps ● Partial Processing: skip records (e.g. on rollback). ● Whole-Batch Transaction ● Scheduled Processing ● Non-Sequential Processing of Steps (Conditional Branching) Batch App Use Cases
- 12. Terminology ● Job Control,Job Launch ● Job Execution, Job Operator ● Step, Step Scope ● Skip Task ● Repeat Jobs ● Transaction Management ● Item Processor, Item Reader Batch Programming Terminology
- 13. Programming Model toDevelop Batch Application in Java/JEE Batch Programming Model
- 14. Developing Batch ApplicationJava/JEE ● Java Batch (JSR-352) ● Spring Batch ● Websphere App Server Batch Support Batch Programming Model
- 15. ● Java Batch(JSR 352) ● First time addresses developing Batch Applications in Java ● Part of JEE 7, Scheduled to release third quarter of 2013 ● IBM & VMware are the Spec lead JSR-352
- 16. ● Spring Batchis an open source module from Spring Framework ● Spring Batch framework started in 2007 ● JSR-352 is influenced by Spring Batch Spring Batch
- 17. Spring Batch Architecture JAVA SpringCore Spring Batch Spring MVC Spring Integration Spring Web Services
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- 19. A Job isan instance that encapsulates an entire batch process. A job is typically put together using a Job Specification Language and consists of multiple steps. The Job Specification Language is implemented with XML and is referred as "Job XML". A Step is a domain object that encapsulates an independent, sequential phase of a job. A step contains all of the information necessary to define and control the actual batch processing. JobOperator provides an interface to manage all aspects of job processing, including operational commands, such as start, restart, and stop, as well as job repository commands, such as retrieval of job and step executions. Batch Processing
- 20. JobRepository holds informationabout jobs current running and jobs that run in the past. JobOperator provides access to this repository. Reader-Processor-Writer pattern is the primary pattern and is called as Chunk-oriented processing. In this, ItemReader reads one item at a time, ItemProcessor processes the item based upon the business logic, such as calculate account balance and hands it to ItemWriter for aggregation. Once the 'chunk' number of items are aggregated, they are written out, and the transaction is committed. Batch Processing
- 21. <job id="myJob" xmlns="http://batch.jsr/jsl"> <stepid="Step1" > <chunk reader="ItemReader1" writer="ItemWriter1" processor="ItemProcessor1" buffer-size="5" checkpoint-policy="item" commit-interval="10" /> </step> <step id="Step2" > .... </step> <step id="Step3" > .... </step> </job> Job XML
- 22. @ItemReader public class ItemReader1{ private static int id; MyCheckPoint checkpoint = null; @Open void open(MyCheckPoint checkpoint) { this.checkpoint = checkpoint; System.out.println(getClass().getName() + ".open: " + checkpoint. getItemCount()); } @ReadItem ItemReader: MyBatchRecord read() { FlatFileItemReader checkpoint.incrementByOne(); JdbcCursorItemReader return new MyBatchRecord(++id); JdbcPagingItemReader }} HibernateCursorItemReader Item Reader
- 23. @ItemProcessor public class ItemProcessor1{ @ProcessItem MyBatchRecord process(MyBatchRecord record) { return (record.getId() % 2 == 0) ? record : null; } DataSource FlatFile XML DataBase Message Item Processor
- 24. @ItemWriter public class ItemWriter1{ MyCheckPoint checkpoint = null; @Open void open(MyCheckPoint checkpoint) { this.checkpoint = checkpoint; System.out.println(getClass().getName() + ".open: " + checkpoint.getItemCount()); } @WriteItems void write(List<MyBatchRecord> list) { System.out.println("Writing the chunk..."); for (MyBatchRecord record : list) { System.out.println(record.getId()); ItemWriter: } FlatFileItemWriter HibernateItemWriter checkpoint.increment(list.size()); JdbcBatchItemWriter System.out.println("... done."); JpaItemWriter }} Item Writer
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- 26. Batch App SequenceDiagram
- 27. JVM GC Policyconsiderations for Batch Applications ● Optimal Throughput ● Generational Concurrency (gencon) JVM Considerations
- 28. The Big Dataand Apache Hadoop ecosystem the future for the Batch Application looks good. Integration of Spring Batch to Hadoop framework Batch Application Future
- 29.