/
balance.go
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/
balance.go
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/*
* Copyright (c) 2020. aberic - 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 balance
const (
// Round 轮询加权负载
Round Class = iota
// Random 随机加权负载
Random
// Hash hash加权负载
Hash
// Smooth 平滑加权负载
Smooth
)
// Class 负载均衡分类
type Class int
// Balancer 负载均衡器
type Balancer interface {
// Add 新增负载对象
Add(interface{})
// Weight 设置负载对象权重
Weight(interface{}, int)
// Remove 移除负载对象
Remove(interface{})
// Class 获取负载均衡分类
Class() Class
// Acquire 执行负载均衡算法得到期望对象
Acquire() (interface{}, error)
}
// NewBalance 新建负载均衡器
func NewBalance(c Class) Balancer {
switch c {
default:
return newRandom()
case Round:
return newRound()
case Random:
return newRandom()
case Hash:
return newHash()
case Smooth:
return newSmooth()
}
}