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task.go
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task.go
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package itask
import (
"log"
"sync"
"time"
)
type Task struct {
preHandlers []*Handler // sync execute
handlers []*Handler // can be sync or parallel
postHandlers []*Handler // sync execute
onRecover func(*RecoverMsg)
}
type RecoverMsg struct {
FuncName string
StartTime int64 // in nano seconds
Err interface{}
}
func NewTask() *Task {
res := new(Task)
return res
}
func (t *Task) PreProcess(f interface{}, args ...interface{}) *Task {
h := NewHandler(f, args...)
t.preHandlers = append(t.preHandlers, h)
return t
}
func (t *Task) Process(f interface{}, args ...interface{}) *Task {
h := NewHandler(f, args...)
t.handlers = append(t.handlers, h)
return t
}
func (t *Task) PostProcess(f interface{}, args ...interface{}) *Task {
h := NewHandler(f, args...)
t.postHandlers = append(t.postHandlers, h)
return t
}
func (t *Task) SetRecover(f func(*RecoverMsg)) {
t.onRecover = f
}
func (t *Task) deferFunc(wg *sync.WaitGroup, h *Handler, startTime int64) {
if wg != nil {
wg.Done()
}
if r := recover(); r != nil {
if t.onRecover != nil {
t.onRecover(&RecoverMsg{GetFuncName(h), startTime, r})
} else {
log.Println(GetFuncName(h), r)
}
}
}
// sync execution
func (t *Task) Run() {
var h Handler
defer t.deferFunc(nil, &h, time.Now().UnixNano())
for i := range t.preHandlers {
h = *t.preHandlers[i]
h.Call()
}
for i := range t.handlers {
h = *t.handlers[i]
h.Call()
}
for i := range t.postHandlers {
h = *t.postHandlers[i]
h.Call()
}
}
// parallel execute, waiting for all go routine finished
func (t *Task) Parallel() {
var h Handler
defer t.deferFunc(nil, &h, time.Now().UnixNano())
for i := range t.preHandlers {
h = *t.preHandlers[i]
h.Call()
}
wg := &sync.WaitGroup{}
for i := range t.handlers {
wg.Add(1)
go func(f *Handler) {
defer t.deferFunc(wg, f, time.Now().UnixNano())
f.Call()
}(t.handlers[i])
}
wg.Wait()
for i := range t.postHandlers {
h = *t.postHandlers[i]
h.Call()
}
}
// parallel execute with timeout
func (t *Task) ParallelWithTimeout(timeout time.Duration) error {
var h Handler
defer t.deferFunc(nil, &h, time.Now().UnixNano())
for i := range t.preHandlers {
h = *t.preHandlers[i]
h.Call()
}
wg := &sync.WaitGroup{}
for i := range t.handlers {
wg.Add(1)
go func(f *Handler) {
defer t.deferFunc(wg, f, time.Now().UnixNano())
f.Call()
}(t.handlers[i])
}
done := make(chan int)
go func() {
wg.Wait()
close(done)
}()
select {
case <-done: // all done
case <-time.After(timeout): // timeout
return ErrExecuteTimeout
}
for i := range t.postHandlers {
h = *t.postHandlers[i]
h.Call()
}
return nil
}
// submit async job
func (t *Task) Async() {
// TODO: write manager to schedule job
go func() {
var h Handler
defer t.deferFunc(nil, &h, time.Now().UnixNano())
for i := range t.preHandlers {
h = *t.preHandlers[i]
h.Call()
}
for i := range t.handlers {
go func(f *Handler) {
defer t.deferFunc(nil, f, time.Now().UnixNano())
f.Call()
}(t.handlers[i])
}
for i := range t.postHandlers {
h = *t.postHandlers[i]
h.Call()
}
}()
}