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4 templates · Sequence diagram

Scheduler Operations Sequence Diagrams

Scheduler operations sequence diagrams model the timed orchestration of tasks—how they are queued, dispatched, rescheduled, or cancelled over time. These diagrams reveal the interaction between a scheduler, worker pools, task queues, and external systems, making them essential for anyone designing or debugging job dispatchers, cron-like services, or workflow engines.

Standard OMG UML 2.5.1 §17 (Interactions)Engine schematex-sequenceExport SVG · PNG · PDF
4 templates
Sequence diagram Scheduler Operations
Scheduler Task CancellationScheduler Task CancellationScheduler OperationsUse template →Scheduler Dependency ResolutionScheduler Dependency ResolutionScheduler OperationsUse template →Scheduler Task ReschedulingScheduler Task ReschedulingScheduler OperationsUse template →Scheduler Task Priority Update Sequence DiagramScheduler Task Priority Update Sequence DiagramScheduler OperationsUse template →

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How to

How to use a sequence diagram template.

  1. 01Define participants

    Identify the scheduler, task queue, worker(s), and any external services. Assign lifelines to each.

  2. 02Add scheduling messages

    Draw the initial task submission and queuing interactions. Use synchronous or asynchronous arrows as appropriate.

  3. 03Model conditional flows

    Add alt or opt fragments for retries, timeouts, or priority changes. Show parallel execution with par fragments if needed.

  4. 04Handle task lifecycle

    Include cancellation signals, rescheduling prompts, and dependency resolution callbacks to complete the operation view.

  5. 05Review and share

    Adjust layout and styling, then export or embed the diagram in your documentation.

FAQ

Questions about sequence diagram templates

What is a scheduler operations sequence diagram?

It is a UML sequence diagram that shows how a scheduler interacts with other components to manage task lifecycles—submission, queuing, execution, rescheduling, and cancellation.

How can I show retry logic in a sequence diagram?

Use an alt fragment to model the decision point after a failure: if retry count is not exceeded, the scheduler sends the task back to the queue; otherwise, it moves to a dead-letter queue.

Can I model distributed task scheduling?

Yes, by adding multiple worker lifelines and a message broker. Use asynchronous messages and add notes to indicate system boundaries or network partitions.

What’s the best way to represent a priority queue?

Include a note on the queue lifeline explaining the ordering rule, or show a separate interaction where a priority update message is sent before the task is dequeued.

Are these diagrams compatible with other tools?

Yes, you can export them as PNG/SVG or copy the source code. They follow standard UML, so they integrate with most documentation platforms.