b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
81 lines
2 KiB
Go
81 lines
2 KiB
Go
// Copyright 2015 PingCAP, Inc.
|
|
//
|
|
// Licensed 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,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package segmentmap
|
|
|
|
import (
|
|
"hash/crc32"
|
|
|
|
"github.com/juju/errors"
|
|
)
|
|
|
|
// SegmentMap is used for handle a big map slice by slice.
|
|
// It's not thread safe.
|
|
type SegmentMap struct {
|
|
size int64
|
|
maps []map[string]interface{}
|
|
|
|
crcTable *crc32.Table
|
|
}
|
|
|
|
// NewSegmentMap create a new SegmentMap.
|
|
func NewSegmentMap(size int64) (*SegmentMap, error) {
|
|
if size <= 0 {
|
|
return nil, errors.Errorf("Invalid size: %d", size)
|
|
}
|
|
|
|
sm := &SegmentMap{
|
|
maps: make([]map[string]interface{}, size),
|
|
size: size,
|
|
}
|
|
for i := int64(0); i < size; i++ {
|
|
sm.maps[i] = make(map[string]interface{})
|
|
}
|
|
|
|
sm.crcTable = crc32.MakeTable(crc32.Castagnoli)
|
|
return sm, nil
|
|
}
|
|
|
|
// Get is the same as map[k].
|
|
func (sm *SegmentMap) Get(key []byte) (interface{}, bool) {
|
|
idx := int64(crc32.Checksum(key, sm.crcTable)) % sm.size
|
|
val, ok := sm.maps[idx][string(key)]
|
|
return val, ok
|
|
}
|
|
|
|
// GetSegment gets the map specific by index.
|
|
func (sm *SegmentMap) GetSegment(index int64) (map[string]interface{}, error) {
|
|
if index >= sm.size || index < 0 {
|
|
return nil, errors.Errorf("index out of bound: %d", index)
|
|
}
|
|
|
|
return sm.maps[index], nil
|
|
}
|
|
|
|
// Set if key not exists, returns whether already exists.
|
|
func (sm *SegmentMap) Set(key []byte, value interface{}, force bool) bool {
|
|
idx := int64(crc32.Checksum(key, sm.crcTable)) % sm.size
|
|
k := string(key)
|
|
_, exist := sm.maps[idx][k]
|
|
if exist && !force {
|
|
return exist
|
|
}
|
|
|
|
sm.maps[idx][k] = value
|
|
return exist
|
|
}
|
|
|
|
// SegmentCount returns how many inner segments.
|
|
func (sm *SegmentMap) SegmentCount() int64 {
|
|
return sm.size
|
|
}
|