/
lifecycle.go
85 lines (77 loc) · 1.42 KB
/
lifecycle.go
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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
cnt uint64
}
// 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,
}
}
// 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)
c.cnt++
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(hang bool) <-chan error {
c.mu.Lock()
// 说明没有用户使用,直接关闭
if c.cnt == 0 && !hang {
if atomic.CompareAndSwapUint32(&c.closing, 0, 1) {
close(c.quit)
}
}
c.mu.Unlock()
return c.quit
}