/
stream.go
69 lines (57 loc) · 1.3 KB
/
stream.go
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package stream
import (
"sync"
"sync/atomic"
"sofastack.io/sofa-mosn/pkg/types"
)
const (
streamStateReset uint32 = iota
streamStateDestroying
streamStateDestroyed
)
type BaseStream struct {
sync.Mutex
streamListeners []types.StreamEventListener
state uint32
}
func (s *BaseStream) AddEventListener(streamCb types.StreamEventListener) {
s.Lock()
s.streamListeners = append(s.streamListeners, streamCb)
s.Unlock()
}
func (s *BaseStream) RemoveEventListener(streamCb types.StreamEventListener) {
s.Lock()
defer s.Unlock()
cbIdx := -1
for i, cb := range s.streamListeners {
if cb == streamCb {
cbIdx = i
break
}
}
if cbIdx > -1 {
s.streamListeners = append(s.streamListeners[:cbIdx], s.streamListeners[cbIdx+1:]...)
}
}
func (s *BaseStream) ResetStream(reason types.StreamResetReason) {
if atomic.LoadUint32(&s.state) != streamStateReset {
return
}
defer s.DestroyStream()
s.Lock()
defer s.Unlock()
for _, listener := range s.streamListeners {
listener.OnResetStream(reason)
}
}
func (s *BaseStream) DestroyStream() {
if !atomic.CompareAndSwapUint32(&s.state, streamStateReset, streamStateDestroying) {
return
}
s.Lock()
defer s.Unlock()
for _, listener := range s.streamListeners {
listener.OnDestroyStream()
}
atomic.StoreUint32(&s.state, streamStateDestroyed)
}