forked from apple/foundationdb
/
multi.go
154 lines (130 loc) · 4.02 KB
/
multi.go
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/*
* multi.go
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* 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,
* 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 main
import (
"fmt"
//"log"
//"time"
"github.com/apple/foundationdb/bindings/go/src/fdb"
"github.com/apple/foundationdb/bindings/go/src/fdb/directory"
"github.com/apple/foundationdb/bindings/go/src/fdb/subspace"
"github.com/apple/foundationdb/bindings/go/src/fdb/tuple"
)
func clear_subspace(db fdb.Transactor, ss subspace.Subspace) {
db.Transact(func(tr fdb.Transaction) (interface{}, error) {
tr.ClearRange(ss)
return nil, nil
})
return
}
type MultiMap struct {
MapSS subspace.Subspace
Pos, Neg []byte
}
func (multi *MultiMap) NewMultiMap(ss subspace.Subspace) {
multi.MapSS = ss
multi.Pos, multi.Neg = []byte{1, 0, 0, 0}, []byte{255, 255, 255, 255}
}
func (multi MultiMap) MultiAdd(trtr fdb.Transactor, index, value interface{}) {
trtr.Transact(func(tr fdb.Transaction) (interface{}, error) {
tr.Add(multi.MapSS.Pack(tuple.Tuple{index, value}), multi.Pos)
return nil, nil
})
}
func (multi MultiMap) MultiSubtract(trtr fdb.Transactor, index, value interface{}) {
trtr.Transact(func(tr fdb.Transaction) (interface{}, error) {
item := tr.Get(multi.MapSS.Pack(tuple.Tuple{index, value})).MustGet()
if item == nil {
tr.Clear(multi.MapSS.Pack(tuple.Tuple{index, value}))
} else if item[0] > 1 || item[1] > 0 || item[2] > 0 || item[3] > 0 {
tr.Add(multi.MapSS.Pack(tuple.Tuple{index, value}), multi.Neg)
}
return item, nil
})
}
func (multi MultiMap) MultiGet(tr fdb.ReadTransactor, index int) (ret []interface{}, e error) {
_, e = tr.ReadTransact(func(tr fdb.ReadTransaction) (interface{}, error) {
pr, err := fdb.PrefixRange(multi.MapSS.Pack(tuple.Tuple{index}))
if err != nil {
return nil, err
}
kvs := tr.GetRange(pr, fdb.RangeOptions{0, -1, false}).GetSliceOrPanic()
ret := make([]interface{}, len(kvs))
i := 0
for _, kv := range kvs {
temp, err := multi.MapSS.Unpack(kv.Key)
if err != nil {
return nil, err
}
ret[i] = temp[1]
i++
}
return nil, nil
})
return
}
func (multi MultiMap) MultiGetCounts(trtr fdb.Transactor, index interface{}) (map[interface{}]int, error) {
i, e := trtr.Transact(func(tr fdb.Transaction) (interface{}, error) {
kr, err := fdb.PrefixRange(multi.MapSS.Pack(tuple.Tuple{}))
if err != nil {
return nil, err
}
ks, err := tr.GetRange(kr, fdb.RangeOptions{}).GetSliceWithError()
counts := make(map[interface{}]int)
for _, v := range ks {
bs := v.Value
k, err := multi.MapSS.Unpack(v.Key)
if err != nil {
return nil, err
}
counts[k[1]] = 0
for i, j := 0, 1; i < len(bs); i++ {
counts[k[1]] += int(bs[i]) * j
j = j << 4
}
}
return counts, nil
})
return i.(map[interface{}]int), e
}
func (multi MultiMap) MultiIsElement(trtr fdb.Transactor, index, value interface{}) bool {
item, _ := trtr.Transact(func(tr fdb.Transaction) (interface{}, error) {
r := tr.Get(multi.MapSS.Pack(tuple.Tuple{index, value})).MustGet()
if r == nil {
return false, nil
}
return true, nil
})
return item.(bool)
}
func main() {
fdb.MustAPIVersion(520)
db := fdb.MustOpenDefault()
MultiMapDemoDir, _ := directory.CreateOrOpen(db, []string{"Multi"}, nil)
clear_subspace(db, MultiMapDemoDir)
var m MultiMap
m.NewMultiMap(MultiMapDemoDir)
m.MultiAdd(db, 1, 2)
m.MultiAdd(db, 1, 2)
m.MultiSubtract(db, 1, 2)
m.MultiAdd(db, 1, 4)
fmt.Println(m.MultiIsElement(db, 1, 2))
fmt.Println(m.MultiGetCounts(db, 1))
}