Glossary¶

Runtime¶

The workflow engine facade handling enqueue, dispatch, execution, and observability operations.

Kernel¶

The persistent Java-side shared state used by runtime instances (executors, counters, queue objects, maintenance state).

Dispatch¶

One gateway timer script cycle that flushes in-memory queue items, claims DB work, and submits runnable jobs.

Claim¶

When an ENQUEUED row is atomically marked PENDING and owned by one executor.

Queue¶

Queue (the database is used as a queue) used for priority, routing, and claiming workflows.

Partition key¶

Resource arbitration key (partitionKey) used to avoid concurrent work on the same unit/resource.

Workflow¶

Orchestration function that coordinates step calls and control flow.

Step¶

SUnit of work with retry/durability behavior.

In-memory enqueue¶

Queue in gateway-side memory that avoids immediate DB write and flushes on next dispatch cycle.

Maintenance mode¶

Operational mode used during cutovers as needed.

• drain: no new claims, let active work finish
• cancel: drain + cooperative cancellation of queued/running work

Generation¶

Counter incremented after successful runtime swap; helps identify active executor generation.

Cooperative cancellation¶

Cancellation model where workflow/step code checks for cancellation and exits safely; no hard preemption.

Events¶

Latest key/value state snapshots for a run.

Streams¶

Append-only log-style records for a run.