func (d *Dataset) MergeSorted(f interface{}) (ret *Dataset) {
ret = d.context.newNextDataset(1, d.Type)
step := d.context.AddAllToOneStep(d, ret)
step.Name = "MergeSorted"
step.Function = func(task *Task) {
outChan := task.Outputs[0].WriteChan
var pq *util.PriorityQueue
// enqueue one item to the pq from each shard
isFirst := true
for shardId, shardChan := range task.InputChans {
if x, ok := <-shardChan; ok {
if isFirst {
isFirst = false
v := guessKey(x)
comparator := getLessThanComparator(d.Type, v, f)
pq = util.NewPriorityQueue(comparator)
}
pq.Enqueue(x.Interface(), shardId)
}
}
for pq.Len() > 0 {
t, shardId := pq.Dequeue()
outChan.Send(reflect.ValueOf(t))
if x, ok := <-task.InputChans[shardId]; ok {
pq.Enqueue(x.Interface(), shardId)
}
}
}
return ret
}
func NewMasterResource() *MasterResource {
l := &MasterResource{
Topology: *resource.NewTopology(),
EventChan: make(chan interface{}, 1),
EvictionQueue: util.NewPriorityQueue(func(a, b interface{}) bool {
x, y := a.(*resource.AgentInformation), b.(*resource.AgentInformation)
return x.LastHeartBeat.Before(y.LastHeartBeat)
}),
}
go l.BackgroundEventLoop()
go l.BackgroundEvictionLoop()
return l
}