Scaffold new system

core/data/data.go

@@ -0,0 +1,41 @@
+// Package data ...
+package data
+
+import "time"
+
+type Envelope struct {
+	Source    string
+	Key       string
+	Timestamp time.Time
+	Sequence  uint64
+	Payload   []byte
+}
+
+type Source interface {
+	Start() error
+	Stop()
+	Name() string
+
+	Subscribe(key string) (<-chan Envelope, error)
+	Unsubscribe(key string) error
+
+	IsValidKey(key string) bool
+	GetSubscriptions() []string
+}
+
+type Sink interface {
+	Start() error
+	Stop()
+
+	Publish(envelope Envelope) error
+}
+
+type Processor interface {
+	Start(context ProcessorContext) error
+	Stop()
+}
+
+type ProcessorContext interface {
+	Send(inPort string, messsage Envelope) error
+	Receive(outPort string) Envelope
+}