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ranges.go
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/
ranges.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package bootstrapper
import (
"math"
"time"
"github.com/m3db/m3/src/dbnode/storage/bootstrap/result"
xtime "github.com/m3db/m3/src/x/time"
)
// ShardTimeRangesTimeWindowGroup represents all time ranges for every shard w/in a block of time.
type ShardTimeRangesTimeWindowGroup struct {
Ranges result.ShardTimeRanges
window xtime.Range
}
// NewShardTimeRangesTimeWindowGroups divides shard time ranges into grouped blocks.
func NewShardTimeRangesTimeWindowGroups(
shardTimeRanges result.ShardTimeRanges,
windowSize time.Duration,
) []ShardTimeRangesTimeWindowGroup {
min, max := shardTimeRanges.MinMax()
estimate := int(math.Ceil(float64(max.Sub(min)) / float64(windowSize)))
grouped := make([]ShardTimeRangesTimeWindowGroup, 0, estimate)
for t := min.Truncate(windowSize); t.Before(max); t = t.Add(windowSize) {
currRange := xtime.Range{
Start: t,
End: minTime(t.Add(windowSize), max),
}
group := make(result.ShardTimeRanges)
for shard, tr := range shardTimeRanges {
iter := tr.Iter()
for iter.Next() {
evaluateRange := iter.Value()
intersection, intersects := evaluateRange.Intersect(currRange)
if !intersects {
continue
}
// Add to this range.
group[shard] = group[shard].AddRange(intersection)
}
}
entry := ShardTimeRangesTimeWindowGroup{
Ranges: group,
window: currRange,
}
grouped = append(grouped, entry)
}
return grouped
}
func minTime(x, y time.Time) time.Time {
if x.Before(y) {
return x
}
return y
}