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lifecycle.go
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lifecycle.go
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// Copyright 2020 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package xcycle
import (
"sync"
"sync/atomic"
)
//Cycle ..
type Cycle struct {
mu *sync.Mutex
wg *sync.WaitGroup
done chan struct{}
quit chan error
closing uint32
waiting uint32
// works []func() error
}
//NewCycle new a cycle life
func NewCycle() *Cycle {
return &Cycle{
mu: &sync.Mutex{},
wg: &sync.WaitGroup{},
done: make(chan struct{}),
quit: make(chan error),
closing: 0,
waiting: 0,
}
}
/*
// Go ..
func (c *Cycle) Go(fns ...func() error) {
c.works = append(c.works, fns...)
}
//RunWait ..
func (c *Cycle) RunWait() <-chan error {
go func(c *Cycle) {
for _, fn := range c.works {
c.wg.Add(1)
go func(c *Cycle, fn func() error) {
defer c.wg.Done()
if err := fn(); err != nil {
c.quit <- err
}
}(c, fn)
}
c.Wait()
close(c.quit)
}(c)
return c.quit
}
*/
//Run a new goroutine
func (c *Cycle) Run(fn func() error) {
c.mu.Lock()
//todo add check options panic before waiting
defer c.mu.Unlock()
c.wg.Add(1)
go func(c *Cycle) {
defer c.wg.Done()
if err := fn(); err != nil {
c.quit <- err
}
}(c)
}
//Done block and return a chan error
func (c *Cycle) Done() <-chan struct{} {
if atomic.CompareAndSwapUint32(&c.waiting, 0, 1) {
go func(c *Cycle) {
c.mu.Lock()
defer c.mu.Unlock()
c.wg.Wait()
close(c.done)
}(c)
}
return c.done
}
//DoneAndClose ..
func (c *Cycle) DoneAndClose() {
<-c.Done()
c.Close()
}
//Close ..
func (c *Cycle) Close() {
c.mu.Lock()
defer c.mu.Unlock()
if atomic.CompareAndSwapUint32(&c.closing, 0, 1) {
close(c.quit)
}
}
// Wait blocked for a life cycle
func (c *Cycle) Wait() <-chan error {
return c.quit
}