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worker/types/worker: remove mutex 

Worker.callbacks contains two types of callbacks: some are action callbacks,
some are message callbacks. Each of those is access from one side of the
communication channel (UI goroutine vs. worker goroutine).

Instead of using a channel, we can use two different maps for each kind. This
simplifies the code and also ensures we don't call an action callback instead
of a message callback (or the other way around).
This commit is contained in:
Simon Ser 2019-05-19 09:50:21 +00:00 committed by Drew DeVault
parent f27db33305
commit 248345d875
1 changed files with 21 additions and 36 deletions
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51
worker/types/worker.go
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@ -2,7 +2,6 @@ package types
import (
"log"
"sync"
"sync/atomic"
)
@ -18,8 +17,8 @@ type Worker struct {
Messages chan WorkerMessage
Logger *log.Logger
callbacks map[int64]func(msg WorkerMessage) // protected by mutex
mutex sync.Mutex
actionCallbacks map[int64]func(msg WorkerMessage)
messageCallbacks map[int64]func(msg WorkerMessage)
}
func NewWorker(logger *log.Logger) *Worker {
@ -27,7 +26,8 @@ func NewWorker(logger *log.Logger) *Worker {
Actions: make(chan WorkerMessage, 50),
Messages: make(chan WorkerMessage, 50),
Logger: logger,
callbacks: make(map[int64]func(msg WorkerMessage)),
actionCallbacks: make(map[int64]func(msg WorkerMessage)),
messageCallbacks: make(map[int64]func(msg WorkerMessage)),
}
}
@ -36,29 +36,6 @@ func (worker *Worker) setId(msg WorkerMessage) {
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)) {
@ -71,7 +48,9 @@ func (worker *Worker) PostAction(msg WorkerMessage,
}
worker.Actions <- msg
worker.setCallback(msg, cb)
if cb != nil {
worker.actionCallbacks[msg.getId()] = cb
}
}
func (worker *Worker) PostMessage(msg WorkerMessage,
@ -86,7 +65,9 @@ func (worker *Worker) PostMessage(msg WorkerMessage,
}
worker.Messages <- msg
worker.setCallback(msg, cb)
if cb != nil {
worker.messageCallbacks[msg.getId()] = cb
}
}
func (worker *Worker) ProcessMessage(msg WorkerMessage) WorkerMessage {
@ -95,8 +76,10 @@ func (worker *Worker) ProcessMessage(msg WorkerMessage) WorkerMessage {
} else {
worker.Logger.Printf("(ui)<= %T\n", msg)
}
if cb, ok := worker.getCallback(msg.InResponseTo()); ok {
cb(msg)
if inResponseTo := msg.InResponseTo(); inResponseTo != nil {
if f, ok := worker.actionCallbacks[inResponseTo.getId()]; ok {
f(msg)
}
}
return msg
}
@ -107,8 +90,10 @@ func (worker *Worker) ProcessAction(msg WorkerMessage) WorkerMessage {
} else {
worker.Logger.Printf("<-(ui) %T\n", msg)
}
if cb, ok := worker.getCallback(msg.InResponseTo()); ok {
cb(msg)
if inResponseTo := msg.InResponseTo(); inResponseTo != nil {
if f, ok := worker.messageCallbacks[inResponseTo.getId()]; ok {
f(msg)
}
}
return msg
}