Spring Batch examples

Spring Batch framework use case examples with Kotlin

Samples (git tags):

Basics

• 01-basic-job - basic multi-step job example
• 02-first-last-flows - flow suffixed and prefied with a step
• 03-...
• 04-decision-based-stepping - conditional (decision based) job stepping
• 05-nested-jobs - nested parent-child jobs showcasing job within job structuring.
• 06-pre-post-listeners - pre-chunk and after-chunk listeners.
• 07-job-parameters - sending in job parameters to a job

Readers

• 08-stateless-item-reader-chunk-job - read items in chunks from a list
• 09-reading-from-db - read items in chunks from database
• 10-reading-from-fs - read items in chunks from file system (csv format)
• 11-reading-from-xml - read items in chunks from XML file
• 12-reading-from-multiple-fs - read items in chunks from multiple files in FS
• 13-reading-stateful-cycle - read items and track events during cycle in a stateful manner

Writers

• 14-writing-basic - writing a basic list of ints to sysout
• 15-writing-items-to-db - writing items to a jdbc database source
• 16-writing-items-to-fs - writing items to a flat file
• 17-writing-items-to-xml - writing items to an XML file
• 18-writing-to-multiple-files - writing items to multiple files/formats

Processors

• 19-processing-basic - processing an item, basic example
• 20-processing-filtering - processing an item, filtering items
• 21-processing-validating - processsing an item, validating and filtering
• 22-processing-chaining - processing an item, chaining processors

Error and State Handling

• 23-restarting-jobs - if job fails during processing, batch restarts from an offset
• 24-retrying-steps - if step fails, retry N times until working
• 25-skipping-steps - if step fails, skip the step that failed
• 26-listen-on-skips - attach listeners to items that are skipped

Scaling Batch

• 27-multi-thread-step - Multi-threaded step (each chunk is processed in its own thread)
• 28-async-processors - AsyncItemProcessor - itemprocessor returns a Future, itemwriter unwraps resolved Future
• 29-local-partitioner - Split step into 4 batches and process in a grid of 4
• 30-remote-partitioner - Split step into multiple remote jvm's passing commands over RabbitMQ and channels

./gradlew clean build
java -jar -Dspring.profiles.active=slave build/libs/spring-batch-examples.jar -minValue=1 -maxValue=100000
java -jar -Dspring.profiles.active=master build/libs/spring-batch-examples.jar -minValue=1 -maxValue=100000

• 31-remote-chunking - Split process chunks into remote JVMs (RabbitMQ)

./gradlew clean build
java -jar -Dspring.profiles.active=slave build/libs/spring-batch-examples.jar
java -jar -Dspring.profiles.active=master build/libs/spring-batch-examples.jar

Controlling Jobs

• 32-starting-a-job - Starting a job via HTTP endpoint
• 33-stopping-a-job - Stopping a job via HTTP endpoint
• 34-scheduling-a-job - Scheduling a job via Spring scheduler
• 35-controlling-via-integration - Controlling job via message-passing (Spring Integration)

Informational messages

• 36-informational-messages - Display info messages for chunk and job milestones