github.com/fufuok/balancer@v1.0.0/examples/new/main.go (about)

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"github.com/fufuok/balancer"
     7  )
     8  
     9  func main() {
    10  	var lb balancer.Balancer
    11  
    12  	// SmoothWeightedRoundRobin / WeightedRoundRobin / WeightedRand use map[string]int
    13  	wNodes := map[string]int{
    14  		"A": 5,
    15  		"B": 1,
    16  		"C": 1,
    17  		"D": 0,
    18  	}
    19  	lb = balancer.New(balancer.WeightedRoundRobin, wNodes, nil)
    20  	fmt.Println("balancer name:", lb.Name())
    21  
    22  	lb = balancer.New(balancer.WeightedRand, wNodes, nil)
    23  	fmt.Println("balancer name:", lb.Name())
    24  
    25  	lb = balancer.New(balancer.SmoothWeightedRoundRobin, wNodes, nil)
    26  	fmt.Println("balancer name:", lb.Name())
    27  
    28  	// result of smooth selection is similar to: A A C A B A A
    29  	for i := 0; i < 7; i++ {
    30  		fmt.Print(lb.Select(), " ")
    31  	}
    32  	fmt.Println()
    33  
    34  	// RoundRobin / Random / ConsistentHash use []string
    35  	nodes := []string{"A", "B", "C"}
    36  	lb = balancer.New(balancer.ConsistentHash, nil, nodes)
    37  	fmt.Println("balancer name:", lb.Name())
    38  
    39  	lb = balancer.New(balancer.Random, nil, nodes)
    40  	fmt.Println("balancer name:", lb.Name())
    41  
    42  	lb = balancer.New(balancer.RoundRobin, nil, nodes)
    43  	fmt.Println("balancer name:", lb.Name())
    44  
    45  	// result of RoundRobin: A B C A B C A
    46  	for i := 0; i < 7; i++ {
    47  		fmt.Print(lb.Select(), " ")
    48  	}
    49  	fmt.Println()
    50  
    51  	// same effect
    52  	lb = balancer.New(balancer.SmoothWeightedRoundRobin, nil, nil)
    53  	lb.Add("A", 1)
    54  	lb.Select()
    55  
    56  	// or like this
    57  	lb = balancer.New(balancer.RoundRobin, nil, nil)
    58  	lb.Update(nodes)
    59  	lb.Select()
    60  }