What are php microservices

#What are microservices?

Microservice is to split a complete system into independent subsystems according to business functions. In the microservice structure, each subsystem is called service for something". These subsystems can run independently in web containers and communicate with each other through RPC.

For example, suppose you need to develop an online mall. According to the idea of ​​microservices, we need to split it into multiple independent services according to functional modules, such as: user services, product services, order services, background management services, data analysis services, etc. Each of these services is an independent project and can be run independently. If there are dependencies between services, they are called through RPC.

Benefits:

#1. The coupling between systems is greatly reduced, and they can be independently developed, deployed, and tested independently. The boundaries between systems are very clear, debugging becomes quite easy, and development efficiency is greatly improved.

2. The coupling between systems is reduced, making the system easier to expand. We can expand certain services in a targeted manner. Assume that this mall is going to have a major promotion, and the order volume may increase greatly. Therefore, we can increase the number of nodes in the order system and product system in a targeted manner. For the backend management system and data analysis system, the number of nodes remains the same. Just level.

3. The reusability of services is higher. For example, when we use the user system as a separate service, all the company's products can use this system as the user system without repeated development.

Then the problem comes. When a microservice structure is adopted, a complete system may be composed of many independent subsystems. When the business volume gradually develops, the relationship between these subsystems will be intricate. And in order to increase the processing capacity of certain services in a targeted manner, some services may be backed by a cluster model consisting of multiple nodes, which undoubtedly greatly increases the difficulty of operation and maintenance. The idea of ​​microservices is good, but the complexity of development and operation and maintenance is too high. In order to solve these problems, Alibaba’s Dubbo was born.

Dubbo

Dubbo is the coordinator of a microservice system. In this system, there are three types The roles are: service provider (hereinafter referred to as provider), service consumer (hereinafter referred to as consumer), and registration center.

You need to introduce Dubbo's jar package into your project when using it, that is, each service must introduce Dubbo's jar package. Then when these services are initialized, Dubbo will send the services that need to be published by the current system, as well as the IP and port number of the current system to the registration center, and the registration center will record them. This is the process of service publishing. At the same time, when the system is initialized, Dubbo will also scan the services that need to be referenced by the current system, and then request the IP and port numbers of these services from the registration center. Then the system can run normally. When system A needs to call the service of system B, A will establish an RPC channel with B, and then call the corresponding service on system B.

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