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dubbo-admin-events

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Implements and reviews dubbo-admin EventBus dispatching. Use when the user asks about Event, Emitter, Subscriber, SubscriptionManager, EventBus component registration, Subscribe or Unsubscribe behavior, Send dispatch rules, subscriber ProcessEvent flow, resource-kind based routing, or event error handling under pkg/core/events/. Do not use for a domain subscriber unless the task changes the event bus contract or dispatch semantics.

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How to use this skill

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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Source SKILL.md: https://github.com/apache/dubbo-admin/blob/HEAD/.agents/skills/dubbo-admin-events/SKILL.md

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dubbo-admin Events

Purpose

Use this skill to modify or explain the shared EventBus contract used by discovery, engine, informers, and subscribers.

When to use

Use for EventBus interfaces, resource-kind dispatching, subscriber registration uniqueness, synchronous processing, and event dispatch error behavior.

Do not use for business logic inside a single subscriber unless EventBus semantics change.

Inputs

Required:

  • EventBus behavior, interface, or dispatch problem.
  • Event producer or subscriber involved.

Optional:

  • Event type.
  • Old and new resource objects.
  • Subscriber names for the same resource kind.

If missing, inspect pkg/core/events/eventbus.go and pkg/core/events/component.go first.

Workflow

  1. Read pkg/core/events/eventbus.go for Event, Emitter, Subscriber, SubscriptionManager, and EventBus interfaces.
  2. Read pkg/core/events/component.go for the concrete EventBus implementation.
  3. Trace producers that call events.NewResourceChangedEvent and Emitter.Send.
  4. Trace consumers implementing ResourceKind, Name, and ProcessEvent.
  5. Read references/eventbus-dispatch.md before changing dispatch semantics.

Output format

Return event source, resource kind, subscribers called, error behavior, changed files, and validation evidence.

Validation

  • Confirm Send uses NewObj() first and OldObj() for delete-like events.
  • Confirm subscriber names are unique per resource kind.
  • Confirm subscriber errors are logged and do not stop later subscribers.
  • Run tests or targeted reasoning for discovery and engine consumers when dispatch changes.

Edge cases

  • Events with both old and new nil cannot be routed.
  • Dispatch is synchronous; long subscriber work blocks the caller.
  • EventBus should stay domain-neutral; put business logic in subscribers.

References

  • Read references/eventbus-dispatch.md for concrete dispatch rules and failure behavior.