/
consumer.go
62 lines (53 loc) · 1.46 KB
/
consumer.go
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package dronesevents
import (
"log"
)
type eventConsumer interface {
Dequeue() (<-chan interface{}, error)
}
type consumerRegistry struct {
consumers map[string]eventConsumer
processors map[string]eventProcessor
}
func newConsumerRegistry() *consumerRegistry {
return &consumerRegistry{
consumers: make(map[string]eventConsumer),
processors: make(map[string]eventProcessor),
}
}
func (reg *consumerRegistry) RegisterConsumer(eventType string, consumer eventConsumer) {
reg.consumers[eventType] = consumer
}
func (reg *consumerRegistry) GetProcessor(eventType string) (processor eventProcessor) {
processor, ok := reg.processors[eventType]
if ok {
return processor
}
log.Printf("No event-processor configured for eventType:%s", eventType)
return nil
}
func (reg *consumerRegistry) RegisterProcessor(eventType string, processor eventProcessor) {
reg.processors[eventType] = processor
}
func (reg *consumerRegistry) consumeEvents() error {
for eventType, consumer := range reg.consumers {
eventsQ, err := consumer.Dequeue()
if err != nil {
return err
}
processor := reg.GetProcessor(eventType)
if processor == nil {
continue
}
log.Printf("Started consuming (%s) events...", eventType)
go func(msgs <-chan interface{}, proc eventProcessor) {
for event := range msgs {
err := proc.Process(event)
if err != nil {
log.Printf("Error processing event: %v, err: %s", event, err)
}
}
}(eventsQ, processor)
}
return nil
}