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shezmu/example/daemons/price_consumer.go

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package daemons
import (
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"time"
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"github.com/localhots/shezmu"
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)
// PriceConsumer consumes price update messages and prints them to the console.
type PriceConsumer struct {
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shezmu.BaseDaemon
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}
// PriceUpdate describes a price update message.
type PriceUpdate struct {
Product string `json:"product"`
Amount float64 `json:"amount"`
}
// Startup creates a new subscription for ProductPriceUpdates topic.
func (p *PriceConsumer) Startup() {
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p.Subscribe("ProductPriceUpdates", func(u PriceUpdate) {
p.Logf("Price for %q is now $%.2f", u.Product, u.Amount)
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})
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p.LimitRate(5, time.Second)
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}