Basic impl added

internal/domain/notifier.go

@@ -0,0 +1,67 @@
+package domain
+
+import (
+	"context"
+)
+
+// Notifier is the core interface that all notification implementations must satisfy
+type Notifier interface {
+	// Send sends a notification and returns the result
+	Send(ctx context.Context, notification *Notification) (*NotificationResult, error)
+
+	// Type returns the notification type this notifier handles
+	Type() NotificationType
+
+	// Validate checks if a notification can be sent with this notifier
+	Validate(notification *Notification) error
+
+	// Close performs cleanup when the notifier is no longer needed
+	Close() error
+}
+
+// NotifierFactory creates notifier instances based on configuration
+type NotifierFactory interface {
+	// Create creates a notifier for the given type
+	Create(notificationType NotificationType) (Notifier, error)
+
+	// RegisterNotifier registers a custom notifier implementation
+	RegisterNotifier(notificationType NotificationType, notifier Notifier) error
+
+	// SupportedTypes returns all supported notification types
+	SupportedTypes() []NotificationType
+}
+
+// NotificationService is the high-level service interface for managing notifications
+type NotificationService interface {
+	// Send queues a notification for delivery
+	Send(ctx context.Context, notification *Notification) (*NotificationResult, error)
+
+	// SendBatch queues multiple notifications for delivery
+	SendBatch(ctx context.Context, notifications []*Notification) ([]*NotificationResult, error)
+
+	// GetNotification retrieves a notification by ID
+	GetNotification(ctx context.Context, id string) (*Notification, error)
+
+	// ListNotifications retrieves notifications matching the filter
+	ListNotifications(ctx context.Context, filter *NotificationFilter) ([]*Notification, error)
+
+	// CancelNotification cancels a pending notification
+	CancelNotification(ctx context.Context, id string) error
+
+	// RetryNotification retries a failed notification
+	RetryNotification(ctx context.Context, id string) (*NotificationResult, error)
+
+	// GetStats returns notification statistics
+	GetStats(ctx context.Context) (*NotificationStats, error)
+}
+
+// NotificationStats contains statistics about notification processing
+type NotificationStats struct {
+	TotalSent      int64              `json:"total_sent"`
+	TotalFailed    int64              `json:"total_failed"`
+	TotalPending   int64              `json:"total_pending"`
+	TotalQueued    int64              `json:"total_queued"`
+	ByType         map[string]int64   `json:"by_type"`
+	ByStatus       map[string]int64   `json:"by_status"`
+	AverageLatency float64            `json:"average_latency_ms"`
+}