cameleer-server/.planning/phases/03-agent-registry-sse-push/03-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
03-agent-registry-sse-push	01	agent-registry	concurrenthashmap lifecycle heartbeat rest-api spring-scheduled	phase provides 01-ingestion-pipeline IngestionBeanConfig pattern, @Scheduled pattern, ProtocolVersionInterceptor	AgentRegistryService with register/heartbeat/lifecycle/command management AgentInfo record with wither-style immutable state transitions AgentCommand record with delivery status tracking AgentEventListener interface for SSE bridge (Plan 02) POST /api/v1/agents/register endpoint POST /api/v1/agents/{id}/heartbeat endpoint GET /api/v1/agents endpoint with ?status= filter AgentLifecycleMonitor with LIVE->STALE->DEAD transitions AgentRegistryConfig with all timing properties	03-02-sse-push 04-security	added patterns immutable-record-with-wither compute-if-present-atomic-swap agent-lifecycle-state-machine	created modified cameleer-server-core/src/main/java/com/cameleer/server/core/agent/AgentInfo.java cameleer-server-core/src/main/java/com/cameleer/server/core/agent/AgentState.java cameleer-server-core/src/main/java/com/cameleer/server/core/agent/AgentCommand.java cameleer-server-core/src/main/java/com/cameleer/server/core/agent/CommandStatus.java cameleer-server-core/src/main/java/com/cameleer/server/core/agent/CommandType.java cameleer-server-core/src/main/java/com/cameleer/server/core/agent/AgentRegistryService.java cameleer-server-core/src/main/java/com/cameleer/server/core/agent/AgentEventListener.java cameleer-server-core/src/test/java/com/cameleer/server/core/agent/AgentRegistryServiceTest.java cameleer-server-app/src/main/java/com/cameleer/server/app/config/AgentRegistryConfig.java cameleer-server-app/src/main/java/com/cameleer/server/app/config/AgentRegistryBeanConfig.java cameleer-server-app/src/main/java/com/cameleer/server/app/agent/AgentLifecycleMonitor.java cameleer-server-app/src/main/java/com/cameleer/server/app/controller/AgentRegistrationController.java cameleer-server-app/src/test/java/com/cameleer/server/app/controller/AgentRegistrationControllerIT.java cameleer-server-app/src/main/java/com/cameleer/server/app/CameleerServerApplication.java cameleer-server-app/src/main/resources/application.yml	AgentInfo as Java record with wither-style methods for immutable ConcurrentHashMap swapping Dead threshold measured from staleTransitionTime, not lastHeartbeat (matches requirement precisely) spring.mvc.async.request-timeout=-1 set now for SSE support in Plan 02	Immutable record + ConcurrentHashMap.compute for thread-safe state transitions AgentEventListener interface in core module as bridge to SSE layer in app module	AGNT-01 AGNT-02 AGNT-03	15min	2026-03-11

Phase 3 Plan 1: Agent Registry Summary

In-memory agent registry with ConcurrentHashMap, LIVE/STALE/DEAD lifecycle via @Scheduled, and REST endpoints for registration/heartbeat/listing

Performance

• Duration: 15 min
• Started: 2026-03-11T17:26:34Z
• Completed: 2026-03-11T17:41:24Z
• Tasks: 2
• Files modified: 15

Accomplishments

• Agent registry domain model with 5 types (AgentInfo, AgentState, AgentCommand, CommandStatus, CommandType)
• Full lifecycle management: register, heartbeat, LIVE->STALE->DEAD transitions with configurable thresholds
• Command queue with PENDING/DELIVERED/ACKNOWLEDGED/EXPIRED status tracking and event listener bridge
• REST endpoints: POST /register, POST /{id}/heartbeat, GET /agents with ?status= filter
• 23 unit tests + 7 integration tests all passing

Task Commits

Each task was committed atomically:

1. Task 1 (RED): Failing tests for agent registry - 4cd7ed9 (test)
2. Task 1 (GREEN): Implement agent registry service - 61f3902 (feat)
3. Task 2: Controllers, config, lifecycle monitor, integration tests - 0372be2 (feat)

Note: Task 1 used TDD with separate RED/GREEN commits

Files Created/Modified

• AgentInfo.java - Immutable record with wither-style methods for atomic state transitions
• AgentState.java - LIVE, STALE, DEAD lifecycle enum
• AgentCommand.java - Command record with delivery status tracking
• CommandStatus.java - PENDING, DELIVERED, ACKNOWLEDGED, EXPIRED enum
• CommandType.java - CONFIG_UPDATE, DEEP_TRACE, REPLAY enum
• AgentRegistryService.java - Core registry: register, heartbeat, lifecycle, commands
• AgentEventListener.java - Interface for SSE bridge (Plan 02 integration point)
• AgentRegistryConfig.java - @ConfigurationProperties for all timing settings
• AgentRegistryBeanConfig.java - @Configuration wiring AgentRegistryService
• AgentLifecycleMonitor.java - @Scheduled lifecycle check and command expiry
• AgentRegistrationController.java - REST endpoints for agents
• AgentRegistryServiceTest.java - 23 unit tests
• AgentRegistrationControllerIT.java - 7 integration tests
• CameleerServerApplication.java - Added AgentRegistryConfig to @EnableConfigurationProperties
• application.yml - Added agent-registry config section and spring.mvc.async.request-timeout

Decisions Made

• Used Java record with wither-style methods for AgentInfo instead of mutable class -- ConcurrentHashMap.compute provides atomic swapping without needing synchronized fields
• Dead threshold measured from staleTransitionTime field (not lastHeartbeat) to match the "5 minutes after going STALE" requirement precisely
• Set spring.mvc.async.request-timeout=-1 proactively for SSE support needed in Plan 02
• Command queue uses ConcurrentLinkedQueue per agent for lock-free command management

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

• DiagramRenderControllerIT has a pre-existing flaky failure (EmptyResultDataAccess in seedDiagram) unrelated to Phase 3 changes. Logged in deferred-items.md.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• AgentRegistryService ready for SSE integration via AgentEventListener interface
• Plan 02 (SSE Push) can wire SseConnectionManager as AgentEventListener implementation
• All agent endpoints under /api/v1/agents/ already covered by ProtocolVersionInterceptor

---

Phase: 03-agent-registry-sse-push Completed: 2026-03-11