深刻浅出dubbo源码系列--provider启动流程分析

时间  2019-12-14 标签 深刻 dubbo 源码 系列 provider 启动 流程 分析

深刻浅出dubbo源码系列--provider启动流程分析

前言

Dubb自己具备很强的扩展性：协议有多种实现，注册中心和底层通讯框架也有多种选择； 咱们下面就梳理下dubbo的核心主流程。主要包括三个子流程：consumer启动，provider的启动，接口调用流程。java

另外注意：注册中心咱们选择zookeeper，协议基于dubbo，通讯使用netty进行讲解。web

Provider启动主流程

总体流程仍是比较复杂的，读源码的时候我习惯先面后点的方式，能够抓住主要链路把流程分析清楚，再扣细节进行点的突破。spring

核心流程图，后面就核心流程的一些说明：apache

在这里插入图片描述

1.在系统启动的时候，根据Spring shemas读取对应的配置，经过DubboBeanDefinitionParser解析相应的属性，放入到内存中，给后续服务暴露提供元数据。
DubboNamespaceHandler-init()
registerBeanDefinitionParser(“service”, new DubboBeanDefinitionParser(ServiceBean.class, true));app

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">

    <!-- provider's application name, used for tracing dependency relationship -->
    <dubbo:application name="demo-provider"/>

    <!-- use multicast registry center to export service -->
    <dubbo:registry address="zookeeper://localhost:2181" />

    <!-- use dubbo protocol to export service on port 20880 -->
    <dubbo:protocol name="dubbo" port="20880"/>

    <!-- service implementation, as same as regular local bean -->
    <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl"/>

    <!-- declare the service interface to be exported -->
    <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService"/>
</beans>

2.咱们看Config模块中框架

2.1 ServiceConfig 【export>>doExport>>doExportUrls>>doExportUrlsFor1Protocol】ide

2.2 获取代理类，经过动态代理获取Invoker
proxyFactory.getInvoker
ProxyFactory$Adaptive.getInvoker【注意这个类是DUBBBO SPI动态生成的类】
JavassistProxyFactory.getInvoker(arg0, arg1, arg2)svg

2.3 进行invoker的发布[分为本地和远程的服务发布，]
protocol.export(wrapperInvoker)
Protocol$Adaptive.export 【注意这个类是DUBBBO SPI动态生成的类】
2.3.1 进入本地的发布动做【本地的比较简单，忽略，只是作了一个 exporterMap.put(key, exporter)】url

2.3.2 进入远程的发布动做
2.3.2.1 RegistryProtocol.export(final Invoker originInvoker)
2.3.2.1.1 进行DubboProtocol的发布动做
RegistryProtocol.doLocalExport(originInvoker)
Protocol$Adaptive.export
DubboProtocol.export
2.3.2.1.1.1 将invoker放入exporterMap中，这一步是前面全部步骤的最终结果。很是关键的一步
exporterMap.put(key, exporter)key为 com.alibaba.dubbo.demo.DemoService:20880 value是invokerspa

2.3.2.1.1.2 打开链接,默认是使用NettyServer
DubboProtocol.openServer(url)
DubboProtocol.createServer(URL url)
Exchangers.bind(url, requestHandler);
HeaderExchanger.bind(URL url, ExchangeHandler handler)
Transporters.bind
NettyServer.doOpen
ServerBootstrap.bind

关键类说明

几个动态生产类【能够拷贝到对应目录，进行源码的debug】
ProxyFactory$Adaptive类：

package com.alibaba.dubbo.rpc;

import com.alibaba.dubbo.common.extension.ExtensionLoader;

public class ProxyFactory$Adaptive implements com.alibaba.dubbo.rpc.ProxyFactory {
	public com.alibaba.dubbo.rpc.Invoker getInvoker(java.lang.Object arg0, java.lang.Class arg1,
			com.alibaba.dubbo.common.URL arg2) throws com.alibaba.dubbo.rpc.RpcException {
		if (arg2 == null)
			throw new IllegalArgumentException("url == null");
		com.alibaba.dubbo.common.URL url = arg2;
		String extName = url.getParameter("proxy", "javassist");
		if (extName == null)
			throw new IllegalStateException("Fail to get extension(com.alibaba.dubbo.rpc.ProxyFactory) name from url("
					+ url.toString() + ") use keys([proxy])");
		com.alibaba.dubbo.rpc.ProxyFactory extension = (com.alibaba.dubbo.rpc.ProxyFactory) ExtensionLoader
				.getExtensionLoader(com.alibaba.dubbo.rpc.ProxyFactory.class).getExtension(extName);
		return extension.getInvoker(arg0, arg1, arg2);
	}

	public java.lang.Object getProxy(com.alibaba.dubbo.rpc.Invoker arg0, boolean arg1)
			throws com.alibaba.dubbo.rpc.RpcException {
		if (arg0 == null)
			throw new IllegalArgumentException("com.alibaba.dubbo.rpc.Invoker argument == null");
		if (arg0.getUrl() == null)
			throw new IllegalArgumentException("com.alibaba.dubbo.rpc.Invoker argument getUrl() == null");
		com.alibaba.dubbo.common.URL url = arg0.getUrl();
		String extName = url.getParameter("proxy", "javassist");
		if (extName == null)
			throw new IllegalStateException("Fail to get extension(com.alibaba.dubbo.rpc.ProxyFactory) name from url("
					+ url.toString() + ") use keys([proxy])");
		com.alibaba.dubbo.rpc.ProxyFactory extension = (com.alibaba.dubbo.rpc.ProxyFactory) ExtensionLoader
				.getExtensionLoader(com.alibaba.dubbo.rpc.ProxyFactory.class).getExtension(extName);
		return extension.getProxy(arg0, arg1);
	}

	public java.lang.Object getProxy(com.alibaba.dubbo.rpc.Invoker arg0) throws com.alibaba.dubbo.rpc.RpcException {
		if (arg0 == null)
			throw new IllegalArgumentException("com.alibaba.dubbo.rpc.Invoker argument == null");
		if (arg0.getUrl() == null)
			throw new IllegalArgumentException("com.alibaba.dubbo.rpc.Invoker argument getUrl() == null");
		com.alibaba.dubbo.common.URL url = arg0.getUrl();
		String extName = url.getParameter("proxy", "javassist");
		if (extName == null)
			throw new IllegalStateException("Fail to get extension(com.alibaba.dubbo.rpc.ProxyFactory) name from url("
					+ url.toString() + ") use keys([proxy])");
		com.alibaba.dubbo.rpc.ProxyFactory extension = (com.alibaba.dubbo.rpc.ProxyFactory) ExtensionLoader
				.getExtensionLoader(com.alibaba.dubbo.rpc.ProxyFactory.class).getExtension(extName);
		return extension.getProxy(arg0);
	}
}

Protocol$Adaptive：

package com.alibaba.dubbo.rpc;

import com.alibaba.dubbo.common.extension.ExtensionLoader;

public class Protocol$Adaptive implements com.alibaba.dubbo.rpc.Protocol {
	public void destroy() {
		throw new UnsupportedOperationException(
				"method public abstract void com.alibaba.dubbo.rpc.Protocol.destroy() of interface com.alibaba.dubbo.rpc.Protocol is not adaptive method!");
	}

	public int getDefaultPort() {
		throw new UnsupportedOperationException(
				"method public abstract int com.alibaba.dubbo.rpc.Protocol.getDefaultPort() of interface com.alibaba.dubbo.rpc.Protocol is not adaptive method!");
	}

	public com.alibaba.dubbo.rpc.Invoker refer(java.lang.Class arg0, com.alibaba.dubbo.common.URL arg1)
			throws com.alibaba.dubbo.rpc.RpcException {
		if (arg1 == null)
			throw new IllegalArgumentException("url == null");
		com.alibaba.dubbo.common.URL url = arg1;
		String extName = (url.getProtocol() == null ? "dubbo" : url.getProtocol());
		if (extName == null)
			throw new IllegalStateException("Fail to get extension(com.alibaba.dubbo.rpc.Protocol) name from url("
					+ url.toString() + ") use keys([protocol])");
		com.alibaba.dubbo.rpc.Protocol extension = (com.alibaba.dubbo.rpc.Protocol) ExtensionLoader
				.getExtensionLoader(com.alibaba.dubbo.rpc.Protocol.class).getExtension(extName);
		return extension.refer(arg0, arg1);
	}

	public com.alibaba.dubbo.rpc.Exporter export(com.alibaba.dubbo.rpc.Invoker arg0)
			throws com.alibaba.dubbo.rpc.RpcException {
		if (arg0 == null)
			throw new IllegalArgumentException("com.alibaba.dubbo.rpc.Invoker argument == null");
		if (arg0.getUrl() == null)
			throw new IllegalArgumentException("com.alibaba.dubbo.rpc.Invoker argument getUrl() == null");
		com.alibaba.dubbo.common.URL url = arg0.getUrl();
		String extName = (url.getProtocol() == null ? "dubbo" : url.getProtocol());
		if (extName == null)
			throw new IllegalStateException("Fail to get extension(com.alibaba.dubbo.rpc.Protocol) name from url("
					+ url.toString() + ") use keys([protocol])");
		com.alibaba.dubbo.rpc.Protocol extension = (com.alibaba.dubbo.rpc.Protocol) ExtensionLoader
				.getExtensionLoader(com.alibaba.dubbo.rpc.Protocol.class).getExtension(extName);
		return extension.export(arg0);
	}
}
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