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dispatcher.go
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dispatcher.go
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package irt
import (
"fmt"
)
type ServiceDispatcher interface {
Dispatch(context interface{}, method string, data []byte) ([]byte, error)
GetSupportedService() string
GetSupportedMethods() []string
}
type Dispatcher struct {
services map[string]ServiceDispatcher
}
func (d *Dispatcher) Register(dispatcher ServiceDispatcher) error {
if dispatcher == nil {
return fmt.Errorf("trying to register a nil dispatcher")
}
if d.services == nil {
d.services = map[string]ServiceDispatcher{}
}
serviceName := dispatcher.GetSupportedService()
_, exists := d.services[serviceName]
if exists {
return fmt.Errorf("trying to register a dispatcher for service %s which is already registered", serviceName)
}
d.services[serviceName] = dispatcher
return nil
}
func (d *Dispatcher) Unregister(serviceName string) bool {
if d.services == nil {
return false
}
_, ok := d.services[serviceName]
if ok {
delete(d.services, serviceName)
return true
}
return false
}
func (d *Dispatcher) Dispatch(context interface{}, service string, method string, data []byte) (out []byte, derr error) {
if d.services == nil {
return nil, fmt.Errorf("no services registered to dispatch to")
}
dispatcher, ok := d.services[service]
if !ok {
return nil, fmt.Errorf("no %s service dispatcher registered", service)
}
defer func() {
if err := recover(); err != nil {
out = []byte{}
derr = fmt.Errorf("error in Dispatch for %s/%s: %+v", service, method, err)
}
}()
return dispatcher.Dispatch(context, method, data)
}