/
row_storage.go
90 lines (75 loc) · 2.65 KB
/
row_storage.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package metric
import (
flatbuffers "github.com/google/flatbuffers/go"
"github.com/lindb/lindb/series/field"
)
// StorageRow represents a metric row with meta information and fields.
type StorageRow struct {
MetricID ID
SeriesID uint32
SlotIndex uint16
FieldIDs []field.ID
Writable bool // Writable symbols if all meta information is set
readOnlyRow
}
// Unmarshal unmarshalls bytes slice into a metric-row without metric context
func (mr *StorageRow) Unmarshal(data []byte) {
mr.m.Init(data, flatbuffers.GetUOffsetT(data))
mr.MetricID = 0
mr.SeriesID = 0
mr.SlotIndex = 0
mr.FieldIDs = mr.FieldIDs[:0]
mr.Writable = false
}
// StorageBatchRows holds multi rows for inserting into memdb
// It is reused in sync.Pool
type StorageBatchRows struct {
appendIndex int
rows []StorageRow
}
// NewStorageBatchRows returns write-context for batch writing.
func NewStorageBatchRows() (ctx *StorageBatchRows) {
return &StorageBatchRows{}
}
func (br *StorageBatchRows) reset() { br.appendIndex = 0 }
func (br *StorageBatchRows) UnmarshalRows(rowsBlock []byte) {
br.reset()
// uint32 length + block encoding
for len(rowsBlock) > 0 {
size := flatbuffers.GetSizePrefix(rowsBlock, 0)
br.append(rowsBlock[flatbuffers.SizeUOffsetT : flatbuffers.SizeUOffsetT+size])
rowsBlock = rowsBlock[flatbuffers.SizeUOffsetT+size:]
}
}
func (br *StorageBatchRows) append(data []byte) {
defer func() { br.appendIndex++ }()
if br.appendIndex < len(br.rows) {
br.rows[br.appendIndex].Unmarshal(data)
return
}
var sr StorageRow
sr.Unmarshal(data)
br.rows = append(br.rows, sr)
}
func (br *StorageBatchRows) Len() int { return br.appendIndex }
func (br *StorageBatchRows) Less(i, j int) bool {
return br.rows[i].Timestamp() < br.rows[j].Timestamp()
}
func (br *StorageBatchRows) Swap(i, j int) { br.rows[i], br.rows[j] = br.rows[j], br.rows[i] }
func (br *StorageBatchRows) Rows() []StorageRow { return br.rows[:br.Len()] }