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firehose_group.go
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/
firehose_group.go
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package firehose_group
import (
"doppler/groupedsinks/sink_wrapper"
"doppler/sinks"
"sync"
"github.com/cloudfoundry/sonde-go/events"
)
type FirehoseGroup interface {
AddSink(sink sinks.Sink, in chan<- *events.Envelope) bool
Exists(sink sinks.Sink) bool
RemoveSink(fsink sinks.Sink) bool
RemoveAllSinks()
IsEmpty() bool
BroadcastMessage(msg *events.Envelope)
}
type firehoseGroup struct {
sinkWrappers []*sink_wrapper.SinkWrapper
lastUsedSinkIndex int
sync.RWMutex
}
func NewFirehoseGroup() *firehoseGroup {
return &firehoseGroup{
sinkWrappers: make([]*sink_wrapper.SinkWrapper, 0),
}
}
func (group *firehoseGroup) Exists(sink sinks.Sink) bool {
group.Lock()
defer group.Unlock()
for _, sinkWrapper := range group.sinkWrappers {
if sink.Identifier() == sinkWrapper.Sink.Identifier() {
return true
}
}
return false
}
func (group *firehoseGroup) AddSink(sink sinks.Sink, in chan<- *events.Envelope) bool {
if group.Exists(sink) {
return false
}
group.Lock()
defer group.Unlock()
sinkWrapper := sink_wrapper.SinkWrapper{InputChan: in, Sink: sink}
group.sinkWrappers = append(group.sinkWrappers, &sinkWrapper)
return true
}
func (group *firehoseGroup) RemoveSink(fsink sinks.Sink) bool {
for i, sinkWrapper := range group.sinkWrappers {
if sinkWrapper.Sink == fsink {
group.Lock()
defer group.Unlock()
close(sinkWrapper.InputChan)
s := group.sinkWrappers
group.sinkWrappers = s[:i+copy(s[i:], s[i+1:])]
return true
}
}
return false
}
func (group *firehoseGroup) RemoveAllSinks() {
for _, sinkWrapper := range group.sinkWrappers {
group.RemoveSink(sinkWrapper.Sink)
}
}
func (group *firehoseGroup) IsEmpty() bool {
return group.length() == 0
}
func (group *firehoseGroup) BroadcastMessage(msg *events.Envelope) {
group.Lock()
defer group.Unlock()
l := len(group.sinkWrappers)
lastUsed := group.lastUsedSinkIndex
if lastUsed >= l {
group.lastUsedSinkIndex = 0
}
group.sinkWrappers[group.lastUsedSinkIndex].InputChan <- msg
group.lastUsedSinkIndex += 1
}
func (group *firehoseGroup) length() int {
group.RLock()
defer group.RUnlock()
return len(group.sinkWrappers)
}