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Update caller readme

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Gregory Eremin 2016-07-26 21:55:10 +02:00
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@ -7,62 +7,21 @@ boilerplate and making package interaction code sexier.
[Documentation](https://godoc.org/github.com/localhots/shezmu/caller)
### Example
Caller abstracts away the process of unmarshaling data before processing.
```go
package main
import (
"log"
"github.com/localhots/shezmu/caller"
"github.com/path/to/package/messenger"
)
type PriceUpdate struct {
Product string `json:"product"`
Amount float32 `json:"amount"`
}
func main() {
messenger.Subscribe("ProductPriceUpdates", func(p PriceUpdate) {
func PriceUpdatePrinter(p PriceUpdate) {
log.Printf("Price for %q is now $%.2f", p.Product, p.Amount)
})
messenger.Deliver()
}
```
Support code:
```go
package messenger
import (
"github.com/localhots/shezmu/caller"
)
type item struct {
topic string
payload []byte
}
var queue <-chan item
var subscriptions = make(map[string][]*caller.Caller)
func Subscribe(topic string, callback interface{}) {
c, err := caller.New(processMessage)
if err != nil {
panic(err)
}
subcriptions[topic] = append(subcriptions[topic], c)
}
func Deliver() {
for itm := range queue {
for _, c := range subscriptions[itm.topic] {
// Payload example:
// {"product": "Paperclip", "amount": 0.01}
c.Call(itm.payload)
}
}
}
// Error handling is skipped for clarity
func main() {
printer, _ := caller.New(PriceUpdatePrinter)
_ = printer.Call([]byte(`{"product": "Paperclip", "amount": 0.01}`))
}
```