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This article shows you how to parse the Ribbon in the five core components of Spring Cloud. The content is concise and easy to understand. It will definitely make your eyes shine. I hope you can gain something through the detailed introduction of this article.

1 . Load Balancer

In fact, when it comes to Load Balancer, most people will think of an nginx in front of our service, but this only implements server-side Load Balancer, so how to solve client-side Load Balancer?

2. Spring Cloud Core Component: Ribbon

Fortunately, the Ribbon in the five core components of Spring Cloud is specifically designed to solve this problem. Let's start with a brief introduction to the Ribbon.

Spring Cloud Ribbon is an HTTP and TCP based client-side Load Balancer tool based on Netflix Ribbon implementation. Spring Cloud encapsulation makes it easy to automatically convert service-oriented REST template requests into client-side Load Balancer service calls.

While the Spring Cloud Ribbon is a tool-like framework that doesn't need to be deployed independently, it exists in almost every microservice and infrastructure built by Spring Cloud.

The calls between microservices and the request forwarding of API gateways are actually implemented through ribbons. At the same time, the ribbon provides us with many Load Balancer algorithms by default, such as polling, random, etc. Of course, we can also implement a custom Load Balancer algorithm for the Ribbon.

3. Several important components in the ribbon

The Ribbon consists of many components, the most important of which are the following six:

IRule: Rules for accessing microservice lists.

IPing: Check whether microservices survive.

ServerList: Used to obtain a list of microservice addresses. It can be either static (providing a fixed set of addresses) or dynamic (periodically querying a list of addresses from a registry). ServerListFilter : Filter the ServerList server list twice. ServerListUpdater : Defines service update policies.

ILoadBalancer : software load balancer portal, integrating all the above components to achieve load function.

So how do these components work together?

ServerList maintains a list of servers by default through static configuration, but usually keeps a lot of thread pool connections, and ServerListFilter can filter it and remove some unnecessary servers.

Determine whether the service is alive according to the heartbeat of IPing, and then ServerListUpdater updates the server status.

IRule is to determine the policy of service access, polling, random, etc. All of the above components will be combined into the ILoadBalancer class to work.

The above is how to parse the Ribbon in the five core components of Spring Cloud. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserves, please pay attention to the industry information channel.

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