package types
import (
"log"
"sync/atomic"
)
var lastId int64 = 1 // access via atomic
type Backend interface {
Run()
}
type Worker struct {
Backend Backend
Actions chan WorkerMessage
Messages chan WorkerMessage
Logger *log.Logger
actionCallbacks map[int64]func(msg WorkerMessage)
messageCallbacks map[int64]func(msg WorkerMessage)
}
func NewWorker(logger *log.Logger) *Worker {
return &Worker{
Actions: make(chan WorkerMessage, 50),
Messages: make(chan WorkerMessage, 50),
Logger: logger,
actionCallbacks: make(map[int64]func(msg WorkerMessage)),
messageCallbacks: make(map[int64]func(msg WorkerMessage)),
}
}
func (worker *Worker) setId(msg WorkerMessage) {
id := atomic.AddInt64(&lastId, 1)
msg.setId(id)
}
func (worker *Worker) PostAction(msg WorkerMessage,
cb func(msg WorkerMessage)) {
worker.setId(msg)
if resp := msg.InResponseTo(); resp != nil {
worker.Logger.Printf("(ui)=> %T:%T\n", msg, resp)
} else {
worker.Logger.Printf("(ui)=> %T\n", msg)
}
worker.Actions <- msg
if cb != nil {
worker.actionCallbacks[msg.getId()] = cb
}
}
func (worker *Worker) PostMessage(msg WorkerMessage,
cb func(msg WorkerMessage)) {
worker.setId(msg)
if resp := msg.InResponseTo(); resp != nil {
worker.Logger.Printf("->(ui) %T:%T\n", msg, resp)
} else {
worker.Logger.Printf("->(ui) %T\n", msg)
}
worker.Messages <- msg
if cb != nil {
worker.messageCallbacks[msg.getId()] = cb
}
}
func (worker *Worker) ProcessMessage(msg WorkerMessage) WorkerMessage {
if resp := msg.InResponseTo(); resp != nil {
worker.Logger.Printf("(ui)<= %T(%d):%T(%d)\n",
msg, msg.getId(), resp, resp.getId())
} else {
worker.Logger.Printf("(ui)<= %T(%d)\n", msg, msg.getId())
}
if inResponseTo := msg.InResponseTo(); inResponseTo != nil {
if f, ok := worker.actionCallbacks[inResponseTo.getId()]; ok {
f(msg)
if _, ok := msg.(*Done); ok {
delete(worker.actionCallbacks, inResponseTo.getId())
}
}
}
return msg
}
func (worker *Worker) ProcessAction(msg WorkerMessage) WorkerMessage {
if resp := msg.InResponseTo(); resp != nil {
worker.Logger.Printf("<-(ui) %T(%d):%T(%d)\n",
msg, msg.getId(), resp, resp.getId())
} else {
worker.Logger.Printf("<-(ui) %T(%d)\n", msg, msg.getId())
}
if inResponseTo := msg.InResponseTo(); inResponseTo != nil {
if f, ok := worker.messageCallbacks[inResponseTo.getId()]; ok {
f(msg)
if _, ok := msg.(*Done); ok {
delete(worker.messageCallbacks, inResponseTo.getId())
}
}
}
return msg
}