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entrance_events.go
74 lines (60 loc) · 1.48 KB
/
entrance_events.go
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package grouper
import (
"sync"
"github.com/tedsuo/ifrit"
)
/*
An EntranceEvent occurs every time an invoked member becomes ready.
*/
type EntranceEvent struct {
Member Member
Process ifrit.Process
}
type entranceEventChannel chan EntranceEvent
func newEntranceEventChannel(bufferSize int) entranceEventChannel {
return make(entranceEventChannel, bufferSize)
}
type entranceEventBroadcaster struct {
channels []entranceEventChannel
buffer slidingBuffer
bufferSize int
lock *sync.Mutex
}
func newEntranceEventBroadcaster(bufferSize int) *entranceEventBroadcaster {
return &entranceEventBroadcaster{
channels: make([]entranceEventChannel, 0),
buffer: newSlidingBuffer(bufferSize),
bufferSize: bufferSize,
lock: new(sync.Mutex),
}
}
func (b *entranceEventBroadcaster) Attach() entranceEventChannel {
b.lock.Lock()
defer b.lock.Unlock()
channel := newEntranceEventChannel(b.bufferSize)
b.buffer.Range(func(event interface{}) {
channel <- event.(EntranceEvent)
})
if b.channels != nil {
b.channels = append(b.channels, channel)
} else {
close(channel)
}
return channel
}
func (b *entranceEventBroadcaster) Broadcast(entrance EntranceEvent) {
b.lock.Lock()
defer b.lock.Unlock()
b.buffer.Append(entrance)
for _, entranceChan := range b.channels {
entranceChan <- entrance
}
}
func (b *entranceEventBroadcaster) Close() {
b.lock.Lock()
defer b.lock.Unlock()
for _, channel := range b.channels {
close(channel)
}
b.channels = nil
}