// Copyright 2021 EMQ Technologies Co., Ltd. // // 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 kv type KeyValue interface { // Set key to hold string value if key does not exist otherwise return an error Setnx(key string, value interface{}) error // Set key to hold the string value. If key already holds a value, it is overwritten Set(key string, value interface{}) error Get(key string, val interface{}) (bool, error) //Must return *common.Error with NOT_FOUND error Delete(key string) error Keys() (keys []string, err error) Clean() error Drop() error }