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tasks.go
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tasks.go
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package core
import (
"context"
)
// Tasker interface for staring task
type Tasker interface {
// Start task
//
// This method is called when task is started and MUST not block.
Start(ctx context.Context) error
// Stop task
Stop()
// Name returns task name
Name() string
}
func (a *App) startTasks() error {
a.stlock.Lock()
defer a.stlock.Unlock()
if a.started {
return nil
}
for _, task := range a.tasks {
if err := task.Start(a.BackgroundContext()); err != nil {
return err
}
}
a.started = true
return nil
}
func (a *App) stopTasks() {
a.stlock.Lock()
defer a.stlock.Unlock()
for _, task := range a.tasks {
task.Stop()
}
a.started = false
}
// AddTask adds task to the app.
//
// If app is already started, task is started immediately.
func (a *App) AddTask(task Tasker) error {
a.stlock.Lock()
defer a.stlock.Unlock()
a.tasks = append(a.tasks, task)
if a.started {
return task.Start(a.BackgroundContext())
}
return nil
}