tianxiaoliang commented on a change in pull request #789:
URL: 
https://github.com/apache/servicecomb-service-center/pull/789#discussion_r547747631



##########
File path: datasource/mongo/sd/listwatch.go
##########
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 sd
+
+import (
+       "context"
+       "fmt"
+       "time"
+
+       "go.mongodb.org/mongo-driver/bson"
+)
+
+type ListWatchConfig struct {
+       Timeout time.Duration
+       Context context.Context
+}
+
+func (lo *ListWatchConfig) String() string {
+       return fmt.Sprintf("{timeout: %s}", lo.Timeout)
+}
+
+type ListWatch interface {
+       List(op ListWatchConfig) (*MongoListWatchResponse, error)
+       // not support new multiple watchers
+       Watch(op ListWatchConfig) Watcher
+
+       DoWatch(ctx context.Context, f func(*MongoListWatchResponse)) error

Review comment:
       
这些接口不能复用etcd么,不要绑定mongodb的概念,etcd和mongo应该有个共通的抽象。毕竟既然你已经用了mongodb了,还抽象什么内容呢




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