dubbo-go中randomLoadBalance的作用是什么

这期内容当中小编将会给大家带来有关dubbo-go中randomLoadBalance的作用是什么，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

randomLoadBalance

dubbo-go-v1.4.2/cluster/loadbalance/random.go

const (        name = "random")func init() {        extension.SetLoadbalance(name, NewRandomLoadBalance)}type randomLoadBalance struct {}// NewRandomLoadBalance ...func NewRandomLoadBalance() cluster.LoadBalance {        return &randomLoadBalance{}}

• randomLoadBalance的NewRandomLoadBalance方法创建randomLoadBalance

Select

dubbo-go-v1.4.2/cluster/loadbalance/random.go

func (lb *randomLoadBalance) Select(invokers []protocol.Invoker, invocation protocol.Invocation) protocol.Invoker {        var length int        if length = len(invokers); length == 1 {                return invokers[0]        }        sameWeight := true        weights := make([]int64, length)        firstWeight := GetWeight(invokers[0], invocation)        totalWeight := firstWeight        weights[0] = firstWeight        for i := 1; i < length; i++ {                weight := GetWeight(invokers[i], invocation)                weights[i] = weight                totalWeight += weight                if sameWeight && weight != firstWeight {                        sameWeight = false                }        }        if totalWeight > 0 && !sameWeight {                // If (not every invoker has the same weight & at least one invoker's weight>0), select randomly based on totalWeight.                offset := rand.Int63n(totalWeight)                for i := 0; i < length; i++ {                        offset -= weights[i]                        if offset < 0 {                                return invokers[i]                        }                }        }        // If all invokers have the same weight value or totalWeight=0, return evenly.        return invokers[rand.Intn(length)]}

• Select方法先判断invokers数量，若只有一个则返回invokers[0]；之后遍历invokers计算totalWeight及sameWeight，若totalWeight大于0且sameWeight为false则使用rand.Int63n(totalWeight)随机一个offset，之后遍历weights，用offset挨个去减weights[i]，若offset小于0，则返回invokers[i]；若都没有选中，则返回invokers[rand.Intn(length)]

小结

randomLoadBalance的NewRandomLoadBalance方法创建randomLoadBalance；其Select方法使用了带weight的方法，具体就是使用rand.Int63n(totalWeight)随机一个offset，之后遍历weights，用offset挨个去减weights[i]，若offset小于0，则返回invokers[i]

上述就是小编为大家分享的dubbo-go中randomLoadBalance的作用是什么了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注行业资讯频道。