Target

A subscription filter specifying which events a component receives. Combines a domain name with optional event type filters.

Structure

message Target {
  string domain = 1;           // Domain to subscribe to
  repeated string types = 2;   // Event types (empty = all)
}

Configuration

Environment variable (distributed mode):

# Format: domain:Type1,Type2;domain2:Type3
ANGZARR_SUBSCRIPTIONS="order:OrderCreated,OrderCompleted;inventory"

Config file (standalone mode):

sagas:
  - domain: saga-order-fulfillment
    subscriptions: "order:OrderCompleted"

Filter Semantics

Configuration	Events Received
order	All events from order domain
order:OrderCreated	Only OrderCreated from order
order:OrderCreated,OrderCancelled	Both types

Use by Component Type

Component	Typical Target
Saga	Single domain, specific events
Process Manager	Multiple domains
Projector	Single domain, all or specific events