f46348ab07
- Add UpdateVersionCache method to JetStreamEventStore for cache synchronization - Add SubscribeToEventStored convenience helper to NATSEventBus - Create integration tests for cross-node broadcasting scenarios - Add example demonstrating NATSEventBus + JetStreamEventStore integration - Tests verify: - Single-node broadcasting works - Multi-node event flow works - Version cache consistency across nodes - Namespace isolation maintained - EventStored subscription works correctly
100 lines
2.9 KiB
Markdown
100 lines
2.9 KiB
Markdown
# Issue: Implement VM/Runtime for Actors
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## Problem
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Only interfaces exist for `Runtime` and `VirtualMachine` in `cluster/types.go` and `cluster/distributed.go`, but no actual implementation. Actors cannot be created, started, stopped, or have their state managed.
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## Required Components
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### 1. VM Implementation (cluster/vm.go - new)
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```go
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type VirtualMachine struct {
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actorID string
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eventStore aether.EventStore
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state map[string]interface{}
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version int64
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}
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```
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Methods needed:
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- `GetID()`, `GetActorID()`, `GetState()` - already in interface
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- `Start()` - replay events to rebuild state
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- `ProcessEvent(event *aether.Event)` - apply event to state
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- `Stop()` - persist final state
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- `GetVersion()` - current event version
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### 2. Runtime Implementation (cluster/runtime.go - new)
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```go
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type Runtime struct {
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natsConn *nats.Conn
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eventStore aether.EventStore
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vmRegistry VMRegistry // map[actorID]*VirtualMachine
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config RuntimeConfig
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}
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```
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Methods needed:
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- `Start()` - initialize and start processing
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- `LoadModel(model eventstorming.Model)` - register domain types
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- `SendMessage(message RuntimeMessage)` - route to appropriate VM
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- `GetActiveVMs()` - return map of active VMs
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- `CreateVM(actorID string)` - create new VM instance
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- `StopVM(actorID string)` - persist and stop VM
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### 3. Event Processing
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- Subscribe to actor's event stream
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- Replay events to build initial state
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- Apply new events as they arrive
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- Handle event versions and conflicts
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## Suggested Design
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### VM Lifecycle
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```
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1. Actor message arrives for actor-123
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2. Runtime checks if VM exists for actor-123
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3. If not, create VM:
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- Replay events from event store
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- Rebuild state
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4. Route message to VM
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5. VM processes message -> creates new events
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6. Events persisted to event store
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7. VM state updated
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```
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### State Management
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- State derived from event replay
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- No separate state store needed
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- Can snapshot periodically for performance
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- Version conflict handling using existing EventStore
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## Implementation Steps
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1. **Create VM struct** in `cluster/vm.go`
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2. **Implement event replay** to rebuild state
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3. **Create Runtime** in `cluster/runtime.go`
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4. **Register Runtime with cluster** via `SetVMProvider`
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5. **Implement message processing** - validate against model
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6. **Add version conflict handling** using existing EventStore
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7. **Write tests** - mock event store, test state transitions
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## File Structure
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```
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cluster/
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├── vm.go # VirtualMachine implementation
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├── runtime.go # Runtime implementation
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├── vm_test.go # VM tests
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├── runtime_test.go # Runtime tests
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└── integration_test.go # Integration tests
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```
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## Acceptance Criteria
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- [ ] VM can be created with actor ID
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- [ ] VM replays events to build state
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- [ ] VM processes events and updates state
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- [ ] VM persists current version
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- [ ] Runtime can create/stop VMs
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- [ ] Runtime manages VM registry
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- [ ] Integration test with NATS and JetStream |