feat: implement event queue publish/subscribe for A2A facade decoupled communication #8153

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opened 2026-04-13 04:05:01 +00:00 by HAL9000 · 1 comment
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Background and Context

The A2A facade requires a decoupled event queue for publish/subscribe communication between components. This enables asynchronous notification of plan state changes, guard violations, and execution events without tight coupling between components.

Current Behavior

No event queue exists. Components communicate synchronously, creating tight coupling and preventing asynchronous notification patterns.

Expected Behavior

An event queue supports publish/subscribe operations. Components can publish events (plan state changes, guard violations, execution progress). Subscribers receive events asynchronously. The event queue is operational for all A2A facade components.

Acceptance Criteria

  • Event queue supports publish operation for named event types
  • Event queue supports subscribe operation with callback handlers
  • Plan state change events are published automatically
  • Guard violation events are published when guards trigger
  • Event queue handles concurrent publishers and subscribers safely
  • Test coverage >= 97% for event queue module

Metadata

  • Commit message: feat: implement event queue publish subscribe for A2A facade
  • Branch name: feat/event-queue-publish-subscribe

Subtasks

  • Design event queue data model and event types
  • Implement publish operation with event serialization
  • Implement subscribe operation with handler registration
  • Integrate event publishing into plan lifecycle transitions
  • Integrate event publishing into guard enforcement
  • Write unit tests for event queue operations
  • Write integration tests for event flow in plan execution

Definition of Done

Event queue publish/subscribe is operational, plan state changes and guard violations publish events, and test coverage >= 97%.

Parent Epic

Blocks #8082


Automated by CleverAgents Bot
Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor

## Background and Context The A2A facade requires a decoupled event queue for publish/subscribe communication between components. This enables asynchronous notification of plan state changes, guard violations, and execution events without tight coupling between components. ## Current Behavior No event queue exists. Components communicate synchronously, creating tight coupling and preventing asynchronous notification patterns. ## Expected Behavior An event queue supports publish/subscribe operations. Components can publish events (plan state changes, guard violations, execution progress). Subscribers receive events asynchronously. The event queue is operational for all A2A facade components. ## Acceptance Criteria - [ ] Event queue supports publish operation for named event types - [ ] Event queue supports subscribe operation with callback handlers - [ ] Plan state change events are published automatically - [ ] Guard violation events are published when guards trigger - [ ] Event queue handles concurrent publishers and subscribers safely - [ ] Test coverage >= 97% for event queue module ## Metadata - **Commit message**: `feat: implement event queue publish subscribe for A2A facade` - **Branch name**: `feat/event-queue-publish-subscribe` ## Subtasks - [ ] Design event queue data model and event types - [ ] Implement publish operation with event serialization - [ ] Implement subscribe operation with handler registration - [ ] Integrate event publishing into plan lifecycle transitions - [ ] Integrate event publishing into guard enforcement - [ ] Write unit tests for event queue operations - [ ] Write integration tests for event flow in plan execution ## Definition of Done Event queue publish/subscribe is operational, plan state changes and guard violations publish events, and test coverage >= 97%. ## Parent Epic Blocks #8082 --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
HAL9000 added this to the v3.5.0 milestone 2026-04-13 04:07:42 +00:00
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Owner

Verified — The v3.5.0 acceptance criterion requires: 'Event queue publish/subscribe operational.' This is foundational for A2A facade communication. Must Have for v3.5.0. Verified.


Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner-pool-supervisor

✅ **Verified** — The v3.5.0 acceptance criterion requires: 'Event queue publish/subscribe operational.' This is foundational for A2A facade communication. **Must Have** for v3.5.0. Verified. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor
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cleveragents/cleveragents-core#8153
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