forked from hazelcast/hazelcast-go-client
/
loadbalancer.go
76 lines (65 loc) · 2.04 KB
/
loadbalancer.go
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// Copyright (c) 2008-2020, Hazelcast, Inc. 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 core
import (
"math/rand"
"sync/atomic"
"time"
)
// RandomLoadBalancer is a loadbalancer that selects members randomly from the given cluster service.
type RandomLoadBalancer struct {
clusterService Cluster
}
func (b *RandomLoadBalancer) Init(cluster Cluster) {
b.clusterService = cluster
}
func (b *RandomLoadBalancer) Next() Member {
membersList := b.clusterService.GetMembers()
size := len(membersList)
if size > 0 {
randomIndex := rand.Intn(size)
return membersList[randomIndex]
}
return nil
}
// NewRandomLoadBalancer creates and returns a RandomLoadBalancer.
func NewRandomLoadBalancer() *RandomLoadBalancer {
rand.Seed(time.Now().Unix())
return &RandomLoadBalancer{}
}
// RoundRobinLoadBalancer is a loadbalancer where members are used with round robin logic.
type RoundRobinLoadBalancer struct {
clusterService Cluster
index int64
}
func (rrl *RoundRobinLoadBalancer) Init(cluster Cluster) {
rrl.clusterService = cluster
}
func (rrl *RoundRobinLoadBalancer) Next() Member {
members := rrl.clusterService.GetMembers()
size := int64(len(members))
if size > 0 {
index := getAndIncrement(&rrl.index) % size
return members[index]
}
return nil
}
// NewRoundRobinLoadBalancer creates and returns a RoundLobinLoadBalancer.
func NewRoundRobinLoadBalancer() *RoundRobinLoadBalancer {
return &RoundRobinLoadBalancer{}
}
func getAndIncrement(val *int64) int64 {
newVal := atomic.AddInt64(val, 1)
return newVal - 1
}