Add realtime gateway and simulator bridge

realtime-gateway/internal/plugin/bus.go

@@ -0,0 +1,53 @@
+package plugin
+
+import (
+	"context"
+	"log/slog"
+	"sync"
+
+	"realtime-gateway/internal/model"
+)
+
+type Handler interface {
+	Name() string
+	Handle(context.Context, model.Envelope) error
+}
+
+type Bus struct {
+	logger   *slog.Logger
+	mu       sync.RWMutex
+	handlers []Handler
+}
+
+func NewBus(logger *slog.Logger) *Bus {
+	return &Bus{
+		logger: logger,
+	}
+}
+
+func (b *Bus) Register(handler Handler) {
+	b.mu.Lock()
+	b.handlers = append(b.handlers, handler)
+	b.mu.Unlock()
+}
+
+func (b *Bus) Publish(envelope model.Envelope) {
+	b.mu.RLock()
+	handlers := append([]Handler(nil), b.handlers...)
+	b.mu.RUnlock()
+
+	for _, handler := range handlers {
+		handler := handler
+		go func() {
+			if err := handler.Handle(context.Background(), envelope); err != nil {
+				b.logger.Warn("plugin handler failed", "handler", handler.Name(), "error", err)
+			}
+		}()
+	}
+}
+
+func (b *Bus) HandlerCount() int {
+	b.mu.RLock()
+	defer b.mu.RUnlock()
+	return len(b.handlers)
+}