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gron.go
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93 lines (80 loc) · 1.51 KB
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package gron
import (
"fmt"
"sync"
)
// c is a global internal Gron instance
var (
c gron
gronOnce sync.Once
)
type gron struct {
tasks map[TaskName]*Task
}
// newGron is an internal call for creating a singleton gron
func newGron() gron {
gronOnce.Do(func() {
c = gron{
tasks: make(map[TaskName]*Task),
}
})
return c
}
// Gron is an user interface for declaring periodic task
func Gron(ops ...Option) error {
task := newTask()
var err error
for _, op := range ops {
if task, err = op(task); err != nil {
return err
}
}
if err := verifyTask(task); err != nil {
return err
}
c.tasks[task.Name] = &task
return nil
}
func verifyTask(t Task) error {
name := t.Name
if _, ok := c.tasks[name]; ok {
return fmt.Errorf("Duplicated task: %s", name)
}
return nil
}
// Remove removes an inactive task from the scheduler
func Remove(name TaskName) {
if t, ok := c.tasks[name]; ok {
go disableTask(t)
// Always keep tasks modification in main routine
delete(c.tasks, name)
}
}
// Disable puts the task inactive
func Disable(name TaskName) {
if t, ok := c.tasks[name]; ok {
go disableTask(t)
}
}
// Enable puts the task active
func Enable(name TaskName) error {
// TODO: sync.Once?
if t, ok := c.tasks[name]; ok {
if t.c != nil {
close(t.c)
t.c = nil
}
t.c = make(chan struct{})
go enableTask(t)
}
return fmt.Errorf("Task<%s> not exists", name)
}
func enableTask(task *Task) {
task.run()
}
func disableTask(task *Task) {
task.c <- struct{}{}
}
func init() {
c = newGron()
}