package types
import (
"log"
"sync"
"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
callbacks map[int64]func(msg WorkerMessage) // protected by mutex
mutex sync.Mutex
}
func NewWorker(logger *log.Logger) *Worker {
return &Worker{
Actions: make(chan WorkerMessage, 50),
Messages: make(chan WorkerMessage, 50),
Logger: logger,
callbacks: make(map[int64]func(msg WorkerMessage)),
}
}
func (worker *Worker) setId(msg WorkerMessage) {
id := atomic.AddInt64(&lastId, 1)
msg.setId(id)
}
func (worker *Worker) setCallback(msg WorkerMessage,
cb func(msg WorkerMessage)) {
if cb != nil {
worker.mutex.Lock()
worker.callbacks[msg.getId()] = cb
worker.mutex.Unlock()
}
}
func (worker *Worker) getCallback(msg WorkerMessage) (func(msg WorkerMessage),
bool) {
if msg == nil {
return nil, false
}
worker.mutex.Lock()
cb, ok := worker.callbacks[msg.getId()]
worker.mutex.Unlock()
return cb, ok
}
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
worker.setCallback(msg, 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
worker.setCallback(msg, cb)
}
func (worker *Worker) ProcessMessage(msg WorkerMessage) WorkerMessage {
if resp := msg.InResponseTo(); resp != nil {
worker.Logger.Printf("(ui)<= %T:%T\n", msg, resp)
} else {
worker.Logger.Printf("(ui)<= %T\n", msg)
}
if cb, ok := worker.getCallback(msg.InResponseTo()); ok {
cb(msg)
}
return msg
}
func (worker *Worker) ProcessAction(msg WorkerMessage) WorkerMessage {
if resp := msg.InResponseTo(); resp != nil {
worker.Logger.Printf("<-(ui) %T:%T\n", msg, resp)
} else {
worker.Logger.Printf("<-(ui) %T\n", msg)
}
if cb, ok := worker.getCallback(msg.InResponseTo()); ok {
cb(msg)
}
return msg
}