lbcache

Documentation

Overview

Package lbcache combine balancer with reslover and cache the resolve result

Index

• type Balancer
  • func (bl *Balancer) GetPicker() loadbalance.Picker
• type BalancerFactory
  • func NewBalancerFactory(resolver discovery.Resolver, balancer loadbalance.Loadbalancer, opts Options) *BalancerFactory
  • func (b *BalancerFactory) Get(ctx context.Context, target rpcinfo.EndpointInfo) (*Balancer, error)
• type Hookable
• type Options

Types

type Balancer

type Balancer struct {
	// contains filtered or unexported fields
}

Balancer same with loadbalance.Loadbalancer but without resolver.Result that has been cached

func (*Balancer) GetPicker

func (bl *Balancer) GetPicker() loadbalance.Picker

GetPicker equal to loadbalance.Balancer without pass discovery.Result, because we cache the result

type BalancerFactory

type BalancerFactory struct {
	Hookable
	// contains filtered or unexported fields
}

BalancerFactory get or create a balancer with given target if has the same key(reslover.Target(target)), we will cache and reuse the Balance

func NewBalancerFactory

func NewBalancerFactory(resolver discovery.Resolver, balancer loadbalance.Loadbalancer, opts Options) *BalancerFactory

NewBalancerFactory get or create a balancer factory for balancer instance cache key with resolver name, balancer name and options

func (*BalancerFactory) Get

func (b *BalancerFactory) Get(ctx context.Context, target rpcinfo.EndpointInfo) (*Balancer, error)

Get create a new balancer if not exists

type Hookable

type Hookable interface {
	// register loadbalance rebalance hook for Rebalance events
	RegisterRebalanceHook(func(ch *discovery.Change)) (index int)
	DeregisterRebalanceHook(index int)
	// register loadbalance delete hook for Delete events
	RegisterDeleteHook(func(ch *discovery.Change)) (index int)
	DeregisterDeleteHook(index int)
}

Hookable add hook for rebalancer events

type Options

type Options struct {
	// refresh discovery result timely
	RefreshInterval time.Duration

	// Balancer expire check interval
	// we need remove idle Balancers for resource saving
	ExpireInterval time.Duration
}

Options for create builder