mirror of
https://github.com/openimsdk/open-im-server.git
synced 2025-10-29 07:12:14 +08:00
124 lines
2.4 KiB
Go
124 lines
2.4 KiB
Go
// Copyright © 2024 OpenIM. All rights reserved.
|
|
//
|
|
// 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 link
|
|
|
|
import (
|
|
"hash/fnv"
|
|
"sync"
|
|
"unsafe"
|
|
)
|
|
|
|
type Link interface {
|
|
Link(key string, link ...string)
|
|
Del(key string) map[string]struct{}
|
|
}
|
|
|
|
func newLinkKey() *linkKey {
|
|
return &linkKey{
|
|
data: make(map[string]map[string]struct{}),
|
|
}
|
|
}
|
|
|
|
type linkKey struct {
|
|
lock sync.Mutex
|
|
data map[string]map[string]struct{}
|
|
}
|
|
|
|
func (x *linkKey) link(key string, link ...string) {
|
|
x.lock.Lock()
|
|
defer x.lock.Unlock()
|
|
v, ok := x.data[key]
|
|
if !ok {
|
|
v = make(map[string]struct{})
|
|
x.data[key] = v
|
|
}
|
|
for _, k := range link {
|
|
v[k] = struct{}{}
|
|
}
|
|
}
|
|
|
|
func (x *linkKey) del(key string) map[string]struct{} {
|
|
x.lock.Lock()
|
|
defer x.lock.Unlock()
|
|
ks, ok := x.data[key]
|
|
if !ok {
|
|
return nil
|
|
}
|
|
delete(x.data, key)
|
|
return ks
|
|
}
|
|
|
|
func New(n int) Link {
|
|
if n <= 0 {
|
|
panic("must be greater than 0")
|
|
}
|
|
slots := make([]*linkKey, n)
|
|
for i := 0; i < len(slots); i++ {
|
|
slots[i] = newLinkKey()
|
|
}
|
|
return &slot{
|
|
n: uint64(n),
|
|
slots: slots,
|
|
}
|
|
}
|
|
|
|
type slot struct {
|
|
n uint64
|
|
slots []*linkKey
|
|
}
|
|
|
|
func (x *slot) index(s string) uint64 {
|
|
h := fnv.New64a()
|
|
_, _ = h.Write(*(*[]byte)(unsafe.Pointer(&s)))
|
|
return h.Sum64() % x.n
|
|
}
|
|
|
|
func (x *slot) Link(key string, link ...string) {
|
|
if len(link) == 0 {
|
|
return
|
|
}
|
|
mk := key
|
|
lks := make([]string, len(link))
|
|
for i, k := range link {
|
|
lks[i] = k
|
|
}
|
|
x.slots[x.index(mk)].link(mk, lks...)
|
|
for _, lk := range lks {
|
|
x.slots[x.index(lk)].link(lk, mk)
|
|
}
|
|
}
|
|
|
|
func (x *slot) Del(key string) map[string]struct{} {
|
|
return x.delKey(key)
|
|
}
|
|
|
|
func (x *slot) delKey(k string) map[string]struct{} {
|
|
del := make(map[string]struct{})
|
|
stack := []string{k}
|
|
for len(stack) > 0 {
|
|
curr := stack[len(stack)-1]
|
|
stack = stack[:len(stack)-1]
|
|
if _, ok := del[curr]; ok {
|
|
continue
|
|
}
|
|
del[curr] = struct{}{}
|
|
childKeys := x.slots[x.index(curr)].del(curr)
|
|
for ck := range childKeys {
|
|
stack = append(stack, ck)
|
|
}
|
|
}
|
|
return del
|
|
}
|