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Merge pull request elastic#3813 from tsg/automatic_merge_from_5.3_to_…
…5.x_branch Automatic merge from 5.3 to 5.x branch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package channel | ||
|
|
||
| import ( | ||
| "sync" | ||
| "sync/atomic" | ||
|
|
||
| "github.com/elastic/beats/filebeat/input" | ||
| ) | ||
|
|
||
| // Outlet struct is used to be passed to an object which needs an outlet | ||
| // | ||
| // The difference between signal and done channel is as following: | ||
| // - signal channel can be added through SetSignal and is used to | ||
| // interrupt events sent through OnEventSignal- | ||
| // - done channel is used to close and stop the outlet | ||
| // | ||
| // If SetSignal is used, it must be ensure that there is only one event producer. | ||
| type Outlet struct { | ||
| wg *sync.WaitGroup // Use for counting active events | ||
| done <-chan struct{} | ||
| signal <-chan struct{} | ||
| channel chan *input.Event | ||
| isOpen int32 // atomic indicator | ||
| } | ||
|
|
||
| func NewOutlet( | ||
| done <-chan struct{}, | ||
| c chan *input.Event, | ||
| wg *sync.WaitGroup, | ||
| ) *Outlet { | ||
| return &Outlet{ | ||
| done: done, | ||
| channel: c, | ||
| wg: wg, | ||
| isOpen: 1, | ||
| } | ||
| } | ||
|
|
||
| // SetSignal sets the signal channel for OnEventSignal | ||
| // If SetSignal is used, it must be ensure that only one producer exists. | ||
| func (o *Outlet) SetSignal(signal <-chan struct{}) { | ||
| o.signal = signal | ||
| } | ||
|
|
||
| func (o *Outlet) OnEvent(event *input.Event) bool { | ||
| open := atomic.LoadInt32(&o.isOpen) == 1 | ||
| if !open { | ||
| return false | ||
| } | ||
|
|
||
| if o.wg != nil { | ||
| o.wg.Add(1) | ||
| } | ||
|
|
||
| select { | ||
| case <-o.done: | ||
| if o.wg != nil { | ||
| o.wg.Done() | ||
| } | ||
| atomic.StoreInt32(&o.isOpen, 0) | ||
| return false | ||
| case o.channel <- event: | ||
| return true | ||
| } | ||
| } | ||
|
|
||
| // OnEventSignal can be stopped by the signal that is set with SetSignal | ||
| // This does not close the outlet. Only OnEvent does close the outlet. | ||
| // If OnEventSignal is used, it must be ensured that only one producer is used. | ||
| func (o *Outlet) OnEventSignal(event *input.Event) bool { | ||
| open := atomic.LoadInt32(&o.isOpen) == 1 | ||
| if !open { | ||
| return false | ||
| } | ||
|
|
||
| if o.wg != nil { | ||
| o.wg.Add(1) | ||
| } | ||
|
|
||
| select { | ||
| case <-o.signal: | ||
| if o.wg != nil { | ||
| o.wg.Done() | ||
| } | ||
| o.signal = nil | ||
| return false | ||
| case o.channel <- event: | ||
| return true | ||
| } | ||
| } |
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