func (q *Quasar) QueryNearestValue(id uuid.UUID, time int64, backwards bool, gen uint64) (qtree.Record, uint64, error) {
tr, err := qtree.NewReadQTree(q.bs, id, gen)
if err != nil {
return qtree.Record{}, 0, err
}
rv, err := tr.FindNearestValue(time, backwards)
return rv, tr.Generation(), err
}
//These functions are the API. TODO add all the bounds checking on PW, and sanity on start/end
func (q *Quasar) QueryValues(id uuid.UUID, start int64, end int64, gen uint64) ([]qtree.Record, uint64, error) {
tr, err := qtree.NewReadQTree(q.bs, id, gen)
if err != nil {
return nil, 0, err
}
rv, err := tr.ReadStandardValuesBlock(start, end)
return rv, tr.Generation(), err
}
func (q *Quasar) QueryValuesStream(id uuid.UUID, start int64, end int64, gen uint64) (chan qtree.Record, chan error, uint64) {
tr, err := qtree.NewReadQTree(q.bs, id, gen)
if err != nil {
return nil, nil, 0
}
recordc := make(chan qtree.Record)
errc := make(chan error)
go tr.ReadStandardValuesCI(recordc, errc, start, end)
return recordc, errc, tr.Generation()
}
func (q *Quasar) QueryStatisticalValuesStream(id uuid.UUID, start int64, end int64,
gen uint64, pointwidth uint8) (chan qtree.StatRecord, chan error, uint64) {
fmt.Printf("QSV1 s=%v e=%v pw=%v\n", start, end, pointwidth)
start &^= ((1 << pointwidth) - 1)
end &^= ((1 << pointwidth) - 1)
rvv := make(chan qtree.StatRecord, 1024)
rve := make(chan error)
tr, err := qtree.NewReadQTree(q.bs, id, gen)
if err != nil {
return nil, nil, 0
}
go tr.QueryStatisticalValues(rvv, rve, start, end, pointwidth)
return rvv, rve, tr.Generation()
}
func (q *Quasar) QueryStatisticalValues(id uuid.UUID, start int64, end int64,
gen uint64, pointwidth uint8) ([]qtree.StatRecord, uint64, error) {
//fmt.Printf("QSV0 s=%v e=%v pw=%v\n", start, end, pointwidth)
start &^= ((1 << pointwidth) - 1)
end &^= ((1 << pointwidth) - 1)
end -= 1
tr, err := qtree.NewReadQTree(q.bs, id, gen)
if err != nil {
return nil, 0, err
}
rv, err := tr.QueryStatisticalValuesBlock(start, end, pointwidth)
if err != nil {
return nil, 0, err
}
return rv, tr.Generation(), nil
}
//Resolution is how far down the tree to go when working out which blocks have changed. Higher resolutions are faster
//but will give you back coarser results.
func (q *Quasar) QueryChangedRanges(id uuid.UUID, startgen uint64, endgen uint64, resolution uint8) ([]ChangedRange, uint64, error) {
//0 is a reserved generation, so is 1, which means "before first"
if startgen == 0 {
startgen = 1
}
tr, err := qtree.NewReadQTree(q.bs, id, endgen)
if err != nil {
log.Debug("Error on QCR open tree")
return nil, 0, err
}
rv := make([]ChangedRange, 0, 1024)
rch := tr.FindChangedSince(startgen, resolution)
var lr *ChangedRange = nil
for {
select {
case cr, ok := <-rch:
if !ok {
//This is the end.
//Do we have an unsaved LR?
if lr != nil {
rv = append(rv, *lr)
}
return rv, tr.Generation(), nil
}
if !cr.Valid {
log.Panicf("Didn't think this could happen")
}
//Coalesce
if lr != nil && cr.Start == lr.End {
lr.End = cr.End
} else {
if lr != nil {
rv = append(rv, *lr)
}
lr = &ChangedRange{Start: cr.Start, End: cr.End}
}
}
}
return rv, tr.Generation(), nil
}
