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Switch Plus Fork

A workflow combines SWITCH routing with FORK parallel execution. Based on type, the workflow either processes a single item or forks into two parallel lanes (A and B) for batch processing. Both paths converge at a finalize step.

Workflow

SWITCH(type)
  ├── "single" ──> single_process
  ├── "parallel" ──> FORK(sf_process_a, sf_process_b) ──> JOIN
  └── default ──> (empty)
                    │
              sf_finalize

Workflow switch_fork_demo accepts type and items. Times out after 60 seconds.

Workers

SingleProcessWorker (single) -- processes a single item.

ProcessAWorker (sf_process_a) -- lane A processes items in parallel.

ProcessBWorker (sf_process_b) -- lane B processes items in parallel.

FinalizeWorker (sf_finalize) -- finalizes after either single or parallel processing.

Workflow Output

The workflow produces type, done as output parameters, capturing the result of each pipeline stage for downstream consumers and observability.

Task Configuration

  • sf_process_a: retryCount=2, retryLogic=FIXED, retryDelaySeconds=?, timeoutSeconds=60, responseTimeoutSeconds=30
  • sf_process_b: retryCount=2, retryLogic=FIXED, retryDelaySeconds=?, timeoutSeconds=60, responseTimeoutSeconds=30
  • sf_single_process: retryCount=2, retryLogic=FIXED, retryDelaySeconds=?, timeoutSeconds=60, responseTimeoutSeconds=30
  • sf_finalize: retryCount=2, retryLogic=FIXED, retryDelaySeconds=?, timeoutSeconds=60, responseTimeoutSeconds=30

These settings are declared in task-defs.json and apply independently to each task, controlling retry behavior, timeout detection, and backoff strategy without any changes to worker code.

Project Structure

This example contains 4 worker implementations in src/main/java/*/workers/, the workflow definition in src/main/resources/workflow.json, and integration tests in src/test/. The workflow switch_fork_demo defines 2 tasks with input parameters type, items and a timeout of 60 seconds.

Tests

5 tests verify single-item routing, parallel lane execution, and post-switch/fork finalization.

Running

See RUNNING.md for setup and execution instructions.