How to realize the unified contract in Dubbo?

itread01 2021-01-22 12:32:09
realize unified contract dubbo


## Before the front , A lot of friends sent me private letters : How to quickly master Dubbo The core principle and source code of . therefore , I wrote an article 《[ How can I quickly grasp Dubbo The principle and source code of ( Pure dry goods )?](https://mp.weixin.qq.com/s?__biz=Mzg4MjU0OTM1OA==&mid=2247490192&idx=1&sn=afedf86349f76c864f42b2b48a245c62&chksm=cf55ad91f8222487088c333cb7160dd63496f9754c5533dbc868d9ac875101cc67dc1483c0da&token=1511921100&lang=zh_CN#rd)》. For Dubbo Source code analysis series of articles , I'm also thinking about how to make the original code analysis article easier to understand , therefore , I adjusted my writing Dubbo Source code analysis strategy of the article , Try to make it easier for the kids to 、 Easy to understand way to master thoroughly Dubbo Source code . today , Let's start with Dubbo How to realize the unified contract in . The article has been included in :[https://github.com/sunshinelyz/technology-binghe](https://github.com/sunshinelyz/technology-binghe)[https://gitee.com/binghe001/technology-binghe](https://gitee.com/binghe001/technology-binghe)## I have to say URLURL The full name is uniform resource locator , It can locate a unique network address on the Internet .URL The format of is as follows .```bashprotocol://username: [email protected]:port/path?key=value&key=value``` among , A brief description of each part is as follows .* protocol:URL Agreement of . The most common protocol is HTTP and HTTPS, Others FTP、WS、FILE、SMTP etc. .* username: User name .* password: code .* host: Host , It's usually a domain name or IP Address .* port: The port number of the host .* path: The path of the requested target file .* parameters: Specific argument information requested , Here is key=value&key=value. This is what we have on the Internet URL A brief description of . So , stay Dubbo Inside , A large number of methods receive arguments in the form of URL To encapsulate , So ,URL stay Dubbo What role does the interior play ? Let's keep looking down .## Dubbo Medium URL** In general , stay Dubbo Inside , Service provider Provider Will encapsulate their own information into URL Sign up to Zookeeper Or other registries , So as to expose the services they provide . And service consumers Consumer It will also pass URL In the form of Zookeeper Or any other registry to subscribe to the service you want to call . And in the Dubbo Of SPI Under implementation ,URL And will participate in the logic processing of the extension suite implementation . So ,URL stay Dubbo Is very important in the implementation of . It can also be said that ,Dubbo Medium URL Namely Dubbo The unified contract of .** Let's take a look at Dubbo Medium URL What does it look like , By debugging Dubbo Bring along Provider Sample source code for , We can see in Dubbo Medium URL As shown below .```bashdubbo://192.168.175.1:20880/org.apache.dubbo.demo.DemoService?anyhost=true&application=dubbo-demo-annotation-provider&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.apache.dubbo.demo.DemoService&methods=sayHello,sayHelloAsync&pid=15012&release=&side=provider×tamp=1610857629484``` This is also Provider Sign up to Zookeeper Or other registry information . The description of each part is as follows .* dubbo: It uses dubbo Agreement .* host: Of the mainframe IP Address: 192.168.175.1.* port: The port number is 20880.* path: The request path here is :org.apache.dubbo.demo.DemoService* parameters: Argument information requested , Here is :anyhost=true&application=dubbo-demo-annotation-provider&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.apache.dubbo.demo.DemoService&methods=sayHello,sayHelloAsync&pid=15012&release=&side=provider×tamp=1610857629484. since Dubbo Is to Zookeeper Or other registration centers , that Dubbo How does the interior respond to URL It's packaged . stay dubbo-common In the module , There is one URL Class is designed to encapsulate URL, As shown below .![](https://img-blog.csdnimg.cn/20210117200650477.png) stay URL Class , Let's look at a core constructor , As shown below .```javapublic URL(String protocol, String username, String password, String host, int port, String path, Map
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