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task.go
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task.go
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package sched
import (
"context"
"github.com/pkg/errors"
"github.com/yaklang/yaklang/common/log"
"github.com/yaklang/yaklang/common/utils"
"time"
)
type Task struct {
// 任务间隔
interval time.Duration
// 任务 ID
ID string
// 任务的启动时间
Start time.Time
// 任务的停止时间
End time.Time
// 任务执行函数
f func()
isDisabled *utils.AtomicBool
// 是否已经执行过了,只会执行一次
isExecuted *utils.AtomicBool
// 是否正在运行中?
isWorking *utils.AtomicBool
// 调度是否生效?
isScheduling *utils.AtomicBool
// 是否结束了
isFinished *utils.AtomicBool
// context
ctx context.Context
// 取消任务
cancel context.CancelFunc
// 第一次是否执行?
first *utils.AtomicBool
// 上一次执行时间和下一次执行时间
last, next time.Time
// 钩子函数
onFinished map[string]TaskCallback
onBeforeExecuting map[string]TaskCallback
onEveryExecuted map[string]TaskCallback
onScheduleStart map[string]TaskCallback
onCanceled map[string]TaskCallback
}
func NewTask(interval time.Duration, id string, start, end time.Time, f func(), first bool) *Task {
return &Task{
interval: interval, ID: id, Start: start, End: end, f: f,
isExecuted: utils.NewAtomicBool(),
isWorking: utils.NewAtomicBool(),
isScheduling: utils.NewAtomicBool(),
isFinished: utils.NewAtomicBool(),
isDisabled: utils.NewAtomicBool(),
ctx: context.Background(),
first: utils.NewBool(first),
onFinished: make(map[string]TaskCallback),
onBeforeExecuting: make(map[string]TaskCallback),
onCanceled: make(map[string]TaskCallback),
onScheduleStart: make(map[string]TaskCallback),
onEveryExecuted: make(map[string]TaskCallback),
}
}
func (t *Task) JustExecuteNotRecording() {
t.f()
}
func (t *Task) SetDisabled(b bool) {
t.isDisabled.SetTo(b)
}
func (t *Task) runWithContext(ctx context.Context) {
t.isScheduling.Set()
callbackLock.Lock()
for _, f := range t.onScheduleStart {
f(t)
}
callbackLock.Unlock()
defer func() {
t.isScheduling.UnSet()
t.isFinished.Set()
callbackLock.Lock()
for _, f := range t.onFinished {
f(t)
}
callbackLock.Unlock()
}()
// 设置 hook 来记录上次执行的时间
taskFunc := func() {
t.isWorking.Set()
t.last = time.Now()
// 设置执行任务前的回调函数
callbackLock.Lock()
for _, f := range t.onBeforeExecuting {
f(t)
}
callbackLock.Unlock()
// 如果已经禁用了,就不能执行
if !t.isDisabled.IsSet() {
t.f()
}
callbackLock.Lock()
for _, f := range t.onEveryExecuted {
f(t)
}
t.next = time.Now().Add(t.interval)
callbackLock.Unlock()
t.isWorking.UnSet()
}
// 设置时间执行时间
var taskCtx = ctx
if t.End.After(time.Now()) {
taskCtx, _ = context.WithDeadline(ctx, t.End)
}
if t.Start.After(time.Now()) {
startCtx, _ := context.WithDeadline(ctx, t.Start)
select {
case <-startCtx.Done():
break
case <-ctx.Done():
callbackLock.Lock()
for _, f := range t.onCanceled {
f(t)
}
callbackLock.Unlock()
return
}
}
// 如果设置了第一次执行的话,则立即执行
if t.first.IsSet() {
taskFunc()
}
// 进入循环模式
ticker := time.Tick(t.interval)
for {
if t.isFinished.IsSet() || !t.isScheduling.IsSet() {
if t.cancel != nil {
t.cancel()
}
return
}
select {
case <-taskCtx.Done():
callbackLock.Lock()
for _, f := range t.onCanceled {
f(t)
}
callbackLock.Unlock()
return
case <-ticker:
taskFunc()
}
}
}
func (t *Task) ExecuteWithContext(ctx context.Context) error {
if t.isExecuted.IsSet() {
return errors.Errorf("execute failed: %s is executed", t.ID)
}
t.isExecuted.Set()
var c context.Context
c, t.cancel = context.WithCancel(ctx)
go t.runWithContext(c)
return nil
}
func (t *Task) Execute() error {
return t.ExecuteWithContext(t.ctx)
}
func (t *Task) Cancel() {
log.Infof("schedule task in memory: %v is canceled", t.ID)
if t.cancel != nil {
t.cancel()
}
t.isScheduling.UnSet()
t.isFinished.Set()
}
// 状态函数
func (t *Task) IsFinished() bool {
return t.isFinished.IsSet()
}
func (t *Task) IsDisabled() bool {
return t.isDisabled.IsSet()
}
func (t *Task) GetIntervalSeconds() int64 {
return int64(t.interval.Seconds())
}
func (t *Task) IsExecuted() bool {
return t.isExecuted.IsSet()
}
func (t *Task) IsWorking() bool {
return t.isWorking.IsSet()
}
func (t *Task) IsInScheduling() bool {
return t.isScheduling.IsSet()
}
// 其他参数
func (t *Task) LastExecutedDate() (time.Time, error) {
if t.last.IsZero() {
return time.Time{}, errors.New("not executed yet")
}
return t.last, nil
}
func (t *Task) NextExecuteDate() (time.Time, error) {
if !t.IsInScheduling() || t.IsFinished() {
return t.next, nil
}
return time.Time{}, errors.New("sched is finished")
}