mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-04 14:46:57 -05:00
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
|
// Copyright 2013 The ql Authors. All rights reserved.
|
||
|
// Use of this source code is governed by a BSD-style
|
||
|
// license that can be found in the LICENSES/QL-LICENSE file.
|
||
|
|
||
|
// 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 memkv
|
||
|
|
||
|
import (
|
||
|
"github.com/pingcap/tidb/util/types"
|
||
|
)
|
||
|
|
||
|
type btreeIterator interface {
|
||
|
Next() (k, v []interface{}, err error)
|
||
|
}
|
||
|
|
||
|
// Temp is the interface of a memory kv storage
|
||
|
type Temp interface {
|
||
|
Drop() (err error)
|
||
|
Get(k []interface{}) (v []interface{}, err error)
|
||
|
SeekFirst() (e btreeIterator, err error)
|
||
|
Set(k, v []interface{}) (err error)
|
||
|
}
|
||
|
|
||
|
// memtemp for join/groupby or any aggregation operation
|
||
|
type memTemp struct {
|
||
|
// memory btree
|
||
|
tree *Tree
|
||
|
}
|
||
|
|
||
|
// CreateTemp returns a new empty memory kv
|
||
|
func CreateTemp(asc bool) (_ Temp, err error) {
|
||
|
return &memTemp{
|
||
|
tree: NewTree(types.Collators[asc]),
|
||
|
}, nil
|
||
|
}
|
||
|
|
||
|
func (t *memTemp) Get(k []interface{}) (v []interface{}, err error) {
|
||
|
v, _ = t.tree.Get(k)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
func (t *memTemp) Drop() (err error) { return }
|
||
|
|
||
|
func (t *memTemp) Set(k, v []interface{}) (err error) {
|
||
|
vv, err := types.Clone(v)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
t.tree.Set(append([]interface{}(nil), k...), vv.([]interface{}))
|
||
|
return
|
||
|
}
|
||
|
|
||
|
func (t *memTemp) SeekFirst() (e btreeIterator, err error) {
|
||
|
it, err := t.tree.SeekFirst()
|
||
|
if err != nil {
|
||
|
return
|
||
|
}
|
||
|
|
||
|
return it, nil
|
||
|
}
|