Learning Spring Batch

This is the demo repository for the Learning Spring Batch videos hosted by O'Reilly.

Outline

Spring Batch Video Outline

1. Introduction 0101 Agenda * Overview of batch processing * What is Spring Batch * Deep dive into implementing complex solutions with Spring Batch * Look at related Spring technologies * Spring Batch Admin * Spring for Apache Hadoop * Spring XD 0102 What is Spring Batch and who uses it? * We have a problem * Our manager has asked that we design a system to process millions of transactions each night. * It has a short time window overnight that it can run. * We'll be on call if it breaks. * And of course, we need to get it done by next week. * We need an architecture that can: * handle many types of input and output * efficiently * that can scale * that is built on battle tested components so we don't get paged! * What is batch processing * The original processing model * What is old is new again... * Data science model training * Definition * Processing of a finite amount of data without interaction or interruption * Finite amount of data * Contrast with a stream * Without interaction or interruption * Contrast with web app * Common batch uses cases * ETL * Reporting * Data Science * Big Data * Other offline processing * What is Spring Batch * The leading batch framework on the JVM * Basis for JSR-352 * Developed as a partnership between Accenture and SpringSource * Released 1.0 in 2008 * 3.0.4 is the current version * Provides the following functionality * Job flow state machine * Transaction handling * Declaritive I/O * Robust error handling * Extensive scalability options * Battle tested in just about every enterprise vertical * Built on Spring! * Who's used Spring Batch * Morgan Stanley * Cars.com * eHarmony * Orbitz * Federal Reserve Bank * Walgreens * MLB * NHL * HSBC * CBOE 0103 Who is this for and what you'll get out of it * Who is this for? * Developers looking to learn how to develop batch processes * Developers who have background processes that they want to build robustly 0104 Expectations/pre-reqs * Java * Spring * XML (although we will be focusing on Java Configuration as much as reasonably possible) * A Github account and related Git knowledge are helpful but not required

2. Hello World 0201 Project Setup * Spring Initializer * start.spring.io * IntelliJ IDEA 0202 Creating a simple job * Create simple Spring Boot based Spring Batch app * Hello world tasklet 0203 Executing our job * Main class with Spring Boot 0204 Reviewing the results * Configure MySql * Look at db * JobInstance * JobExecution * StepExecution * JobLauncher * JobRepository * Schema * Review the data * Map Job Repository - Don't use it 0205 The Domain of Batch * Job * Step * Tasklet * Reader/Processor/Writer * Chunk/Item

3. Job Flow 0301 Transitions * Next * Fail * Stop * End 0302 Flows * 0303 Splits 0304 Decisions 0305 Nested Jobs 0306 Listeners 0307 Job Parameters

4. Input 0401 Interfaces 0402 Reading from a database 0403 Reading files 0404 Reading XML files 0405 Reading from multiple sources 0408 State * ItemStream * ExecutionContext * open * update * close

5. Output 0501 Interfaces (ItemWriter) 0502 Writing to a database 0503 Writing flat files 0504 Writing XML files 0505 Writing to multiple sources

6. Processing 0601 ItemProcessor Interface 0602 Filtering items 0603 Validating items 0604 CompositeItemProcessors

7. Error Handling 0701 Restart 0702 Retry 0703 Skip 0704 Listeners

8. Scaling jobs 0801 Ways of scaling Spring Batch jobs 0802 Multi-Threaded Step 0803 AsyncItemProcessor/AsyncItemWriter 0804 Partitioning 0805 Remote Chunking

9. Job Orchestration 0901 Starting a job 0902 Stopping a job 0903 Scheduling a job using Spring Schedule 0904 Job Orchestration concerns

10. Spring Batch With Spring Integration 1001 Launching jobs via messages 1002 Informational messages

11. Conclusion 1101 What we learned 1102 About the author