forked from lfq7413/tomato
/
subscription.go
70 lines (63 loc) · 1.79 KB
/
subscription.go
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package server
import "github.com/freeznet/tomato/livequery/t"
// SubscriptionInfo 订阅对象信息
// 每一个客户端请求对应一个对象
type SubscriptionInfo struct {
Subscription *Subscription
SessionToken string
Fields []string
}
// Subscription 订阅对象
// 一组 ClassName Hash 对应唯一一个对象
// ClientRequestIDs 记录连接到该对象的所有客户端
type Subscription struct {
Query t.M
ClassName string
Hash string
ClientRequestIDs map[int][]int
}
// NewSubscription ...
func NewSubscription(className string, query t.M, queryHash string) *Subscription {
s := &Subscription{}
s.ClassName = className
s.Query = query
s.Hash = queryHash
s.ClientRequestIDs = map[int][]int{}
return s
}
// AddClientSubscription 添加连接到该订阅对象的客户端请求
func (s *Subscription) AddClientSubscription(clientID, requestID int) {
requestIDs := s.ClientRequestIDs[clientID]
if requestIDs == nil {
requestIDs = []int{}
}
requestIDs = append(requestIDs, requestID)
s.ClientRequestIDs[clientID] = requestIDs
}
// DeleteClientSubscription 删除连接到该订阅对象的客户端请求
func (s *Subscription) DeleteClientSubscription(clientID, requestID int) {
requestIDs := s.ClientRequestIDs[clientID]
if requestIDs == nil {
return
}
index := -1
for i, id := range requestIDs {
if id == requestID {
index = i
break
}
}
if index < 0 {
return
}
requestIDs[index] = requestIDs[len(requestIDs)-1]
requestIDs = requestIDs[:len(requestIDs)-1]
s.ClientRequestIDs[clientID] = requestIDs
if len(requestIDs) == 0 {
delete(s.ClientRequestIDs, clientID)
}
}
// HasSubscribingClient 返回连接到该对象的客户端数量
func (s *Subscription) HasSubscribingClient() bool {
return len(s.ClientRequestIDs) > 0
}