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replace unnecessary Task interface with struct

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This commit is contained in:
yusing
2024-12-17 09:32:51 +08:00
parent 4d94d12e9c
commit c5d96f96e1
15 changed files with 106 additions and 112 deletions
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142
internal/task/task.go
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@@ -16,11 +16,11 @@ import (
var globalTask = createGlobalTask()
func createGlobalTask() (t *task) {
t = new(task)
func createGlobalTask() (t *Task) {
t = new(Task)
t.name = "root"
t.ctx, t.cancel = context.WithCancelCause(context.Background())
t.subtasks = F.NewSet[*task]()
t.subtasks = F.NewSet[*Task]()
return
}
@@ -29,52 +29,6 @@ func testResetGlobalTask() {
}
type (
// Task controls objects' lifetime.
//
// Objects that uses a task should implement the TaskStarter and the TaskFinisher interface.
//
// When passing a Task object to another function,
// it must be a sub-task of the current task,
// in name of "`currentTaskName`Subtask"
//
// Use Task.Finish to stop all subtasks of the task.
Task interface {
TaskFinisher
fmt.Stringer
// Name returns the name of the task.
Name() string
// Context returns the context associated with the task. This context is
// canceled when Finish of the task is called, or parent task is canceled.
Context() context.Context
// FinishCause returns the reason / error that caused the task to be finished.
FinishCause() error
// Parent returns the parent task of the current task.
Parent() Task
// Subtask returns a new subtask with the given name, derived from the parent's context.
//
// If the parent's context is already canceled, the returned subtask will be canceled immediately.
//
// This should not be called after Finish, Wait, or WaitSubTasks is called.
Subtask(name string) Task
// OnFinished calls fn when all subtasks are finished.
//
// It cannot be called after Finish or Wait is called.
OnFinished(about string, fn func())
// OnCancel calls fn when the task is canceled.
//
// It cannot be called after Finish or Wait is called.
OnCancel(about string, fn func())
// Wait waits for all subtasks, itself, OnFinished and OnSubtasksFinished to finish.
//
// It must be called only after Finish is called.
Wait()
// WaitSubTasks waits for all subtasks of the task to finish.
//
// No more subtasks can be added after this call.
//
// It can be called before Finish is called.
WaitSubTasks()
}
TaskStarter interface {
// Start starts the object that implements TaskStarter,
// and returns an error if it fails to start.
@@ -82,7 +36,7 @@ type (
// The task passed must be a subtask of the caller task.
//
// callerSubtask.Finish must be called when start fails or the object is finished.
Start(callerSubtask Task) E.Error
Start(callerSubtask *Task) E.Error
}
TaskFinisher interface {
// Finish marks the task as finished and cancel its context.
@@ -93,12 +47,21 @@ type (
// Note that it will also cancel all subtasks.
Finish(reason any)
}
task struct {
// Task controls objects' lifetime.
//
// Objects that uses a Task should implement the TaskStarter and the TaskFinisher interface.
//
// When passing a Task object to another function,
// it must be a sub-Task of the current Task,
// in name of "`currentTaskName`Subtask"
//
// Use Task.Finish to stop all subtasks of the Task.
Task struct {
ctx context.Context
cancel context.CancelCauseFunc
parent *task
subtasks F.Set[*task]
parent *Task
subtasks F.Set[*Task]
subTasksWg sync.WaitGroup
name string
@@ -119,7 +82,7 @@ var (
)
// GlobalTask returns a new Task with the given name, derived from the global context.
func GlobalTask(format string, args ...any) Task {
func GlobalTask(format string, args ...any) *Task {
if len(args) > 0 {
format = fmt.Sprintf(format, args...)
}
@@ -168,11 +131,12 @@ func GlobalContextWait(timeout time.Duration) (err error) {
}
}
func (t *task) trace(msg string) {
func (t *Task) trace(msg string) {
logger.Trace().Str("name", t.name).Msg(msg)
}
func (t *task) Name() string {
// Name returns the name of the task.
func (t *Task) Name() string {
if !common.IsTrace {
return t.name
}
@@ -180,15 +144,19 @@ func (t *task) Name() string {
return parts[len(parts)-1]
}
func (t *task) String() string {
// String returns the name of the task.
func (t *Task) String() string {
return t.name
}
func (t *task) Context() context.Context {
// Context returns the context associated with the task. This context is
// canceled when Finish of the task is called, or parent task is canceled.
func (t *Task) Context() context.Context {
return t.ctx
}
func (t *task) FinishCause() error {
// FinishCause returns the reason / error that caused the task to be finished.
func (t *Task) FinishCause() error {
cause := context.Cause(t.ctx)
if cause == nil {
return t.ctx.Err()
@@ -196,11 +164,12 @@ func (t *task) FinishCause() error {
return cause
}
func (t *task) Parent() Task {
// Parent returns the parent task of the current task.
func (t *Task) Parent() *Task {
return t.parent
}
func (t *task) runAllOnFinished(onCompTask Task) {
func (t *Task) runAllOnFinished(onCompTask *Task) {
<-t.ctx.Done()
t.WaitSubTasks()
for _, OnFinishedFunc := range t.OnFinishedFuncs {
@@ -210,7 +179,10 @@ func (t *task) runAllOnFinished(onCompTask Task) {
onCompTask.Finish(fmt.Errorf("%w: %s, reason: %s", ErrTaskCanceled, t.name, "done"))
}
func (t *task) OnFinished(about string, fn func()) {
// OnFinished calls fn when all subtasks are finished.
//
// It cannot be called after Finish or Wait is called.
func (t *Task) OnFinished(about string, fn func()) {
if t.parent == globalTask {
t.OnCancel(about, fn)
return
@@ -239,7 +211,10 @@ func (t *task) OnFinished(about string, fn func()) {
t.OnFinishedFuncs = append(t.OnFinishedFuncs, wrapped)
}
func (t *task) OnCancel(about string, fn func()) {
// OnCancel calls fn when the task is canceled.
//
// It cannot be called after Finish or Wait is called.
func (t *Task) OnCancel(about string, fn func()) {
onCompTask := GlobalTask(t.name + " > OnFinished")
go func() {
<-t.ctx.Done()
@@ -249,7 +224,13 @@ func (t *task) OnCancel(about string, fn func()) {
}()
}
func (t *task) Finish(reason any) {
// Finish marks the task as finished and cancel its context.
//
// Then call Wait to wait for all subtasks, OnFinished and OnSubtasksFinished
// of the task to finish.
//
// Note that it will also cancel all subtasks.
func (t *Task) Finish(reason any) {
var format string
switch reason.(type) {
case error:
@@ -265,22 +246,27 @@ func (t *task) Finish(reason any) {
t.Wait()
}
func (t *task) Subtask(name string) Task {
// Subtask returns a new subtask with the given name, derived from the parent's context.
//
// If the parent's context is already canceled, the returned subtask will be canceled immediately.
//
// This should not be called after Finish, Wait, or WaitSubTasks is called.
func (t *Task) Subtask(name string) *Task {
ctx, cancel := context.WithCancelCause(t.ctx)
return t.newSubTask(ctx, cancel, name)
}
func (t *task) newSubTask(ctx context.Context, cancel context.CancelCauseFunc, name string) *task {
func (t *Task) newSubTask(ctx context.Context, cancel context.CancelCauseFunc, name string) *Task {
parent := t
if common.IsTrace {
name = parent.name + " > " + name
}
subtask := &task{
subtask := &Task{
ctx: ctx,
cancel: cancel,
name: name,
parent: parent,
subtasks: F.NewSet[*task](),
subtasks: F.NewSet[*Task](),
}
parent.subTasksWg.Add(1)
parent.subtasks.Add(subtask)
@@ -299,13 +285,21 @@ func (t *task) newSubTask(ctx context.Context, cancel context.CancelCauseFunc, n
return subtask
}
func (t *task) Wait() {
// Wait waits for all subtasks, itself, OnFinished and OnSubtasksFinished to finish.
//
// It must be called only after Finish is called.
func (t *Task) Wait() {
<-t.ctx.Done()
t.WaitSubTasks()
t.onFinishedWg.Wait()
}
func (t *task) WaitSubTasks() {
// WaitSubTasks waits for all subtasks of the task to finish.
//
// No more subtasks can be added after this call.
//
// It can be called before Finish is called.
func (t *Task) WaitSubTasks() {
t.subTasksWg.Wait()
}
@@ -322,7 +316,7 @@ func (t *task) WaitSubTasks() {
//
// The returned string is not guaranteed to be stable, and may change between
// runs of the program. It is intended for debugging purposes only.
func (t *task) tree(prefix ...string) string {
func (t *Task) tree(prefix ...string) string {
var sb strings.Builder
var pre string
if len(prefix) > 0 {
@@ -330,7 +324,7 @@ func (t *task) tree(prefix ...string) string {
sb.WriteString(pre + "- ")
}
sb.WriteString(t.Name() + "\n")
t.subtasks.RangeAll(func(subtask *task) {
t.subtasks.RangeAll(func(subtask *Task) {
sb.WriteString(subtask.tree(pre + " "))
})
return sb.String()
@@ -350,13 +344,13 @@ func (t *task) tree(prefix ...string) string {
// The returned map is not guaranteed to be stable, and may change
// between runs of the program. It is intended for debugging purposes
// only.
func (t *task) serialize() map[string]any {
func (t *Task) serialize() map[string]any {
m := make(map[string]any)
parts := strings.Split(t.name, " > ")
m["name"] = parts[len(parts)-1]
if t.subtasks.Size() > 0 {
m["subtasks"] = make([]map[string]any, 0, t.subtasks.Size())
t.subtasks.RangeAll(func(subtask *task) {
t.subtasks.RangeAll(func(subtask *Task) {
m["subtasks"] = append(m["subtasks"].([]map[string]any), subtask.serialize())
})
}