09_dubbo服务发布原理

【 启动服务的日志分析 】

1.暴露本地服务

Export dubbo service com.alibaba.dubbo.demo.DemoService to local registry, dubbo version: 2.0.0, current host: 127.0.0.1

2.暴露远程服务

Export dubbo service com.alibaba.dubbo.demo.DemoService to url dubbo://192.168.100.38:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&dubbo=2.0.0&generic=false&interface=com.alibaba.dubbo.demo.DemoService&loadbalance=roundrobin&methods=sayHello&owner=william&pid=8484&side=provider&timestamp=1473908495465, dubbo version: 2.0.0, current host: 127.0.0.1
Register dubbo service com.alibaba.dubbo.demo.DemoService url dubbo://192.168.100.38:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&dubbo=2.0.0&generic=false&interface=com.alibaba.dubbo.demo.DemoService&loadbalance=roundrobin&methods=sayHello&monitor=dubbo%3A%2F%2F192.168.48.117%3A2181%2Fcom.alibaba.dubbo.registry.RegistryService%3Fapplication%3Ddemo-provider%26backup%3D192.168.48.120%3A2181%2C192.168.48.123%3A2181%26dubbo%3D2.0.0%26owner%3Dwilliam%26pid%3D8484%26protocol%3Dregistry%26refer%3Ddubbo%253D2.0.0%2526interface%253Dcom.alibaba.dubbo.monitor.MonitorService%2526pid%253D8484%2526timestamp%253D1473908495729%26registry%3Dzookeeper%26timestamp%3D1473908495398&owner=william&pid=8484&side=provider&timestamp=1473908495465 to registry registry://192.168.48.117:2181/com.alibaba.dubbo.registry.RegistryService?application=demo-provider&backup=192.168.48.120:2181,192.168.48.123:2181&dubbo=2.0.0&owner=william&pid=8484&registry=zookeeper&timestamp=1473908495398, dubbo version: 2.0.0, current host: 127.0.0.1

3.启动Netty

Start NettyServer bind /0.0.0.0:20880, export /192.168.100.38:20880, dubbo version: 2.0.0, current host: 127.0.0.1

4.打开zk连接

INFO zookeeper.ClientCnxn: Opening socket connection to server /192.168.48.117:2181

5.将服务信息注册到zk

Register: dubbo://192.168.100.38:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&dubbo=2.0.0&generic=false&interface=com.alibaba.dubbo.demo.DemoService&loadbalance=roundrobin&methods=sayHello&owner=william&pid=8484&side=provider&timestamp=1473908495465, dubbo version: 2.0.0, current host: 127.0.0.1

6.监听zk

Subscribe: provider://192.168.100.38:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&category=configurators&check=false&dubbo=2.0.0&generic=false&interface=com.alibaba.dubbo.demo.DemoService&loadbalance=roundrobin&methods=sayHello&owner=william&pid=8484&side=provider&timestamp=1473908495465, dubbo version: 2.0.0, current host: 127.0.0.1
Notify urls for subscribe url provider://192.168.100.38:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&category=configurators&check=false&dubbo=2.0.0&generic=false&interface=com.alibaba.dubbo.demo.DemoService&loadbalance=roundrobin&methods=sayHello&owner=william&pid=8484&side=provider&timestamp=1473908495465, urls: [empty://192.168.100.38:20880/com.alibaba.dubbo.demo.DemoService?anyhost=true&application=demo-provider&category=configurators&check=false&dubbo=2.0.0&generic=false&interface=com.alibaba.dubbo.demo.DemoService&loadbalance=roundrobin&methods=sayHello&owner=william&pid=8484&side=provider&timestamp=1473908495465], dubbo version: 2.0.0, current host: 127.0.0.1

【 暴露本地服务和暴露远程服务的区别 】

1.暴露本地服务

指暴露在用一个JVM里面，不用通过调用zk进行远程通信，例如：在同一个服务，自己调用自己的接口，没必要进行网络IP连接来通信。

2.暴露远程服务

指暴露给远程客户端的IP和端口号，通过网络来实现通信。

【源码涉及的一些代码】 

[ 1.proxyFactory ]

就是为了获取一个接口的代理类，例如远程获取一个远程接口的代理。

它有两个方法，代表两个作用：

 [ 2.Wrapper ]

[ 3.Invoker ]

Invoker是一个可执行的对象，能够根据方法的名称、参数得到对应的执行结果。

它里面有一个重要方法Result invoke(Invocation invocation)

Invocation是包含了需要执行的方法和方法参数等重要信息，目前它有2个重要的实现类RpcInvocation、MockInvocation。

有三种类型的Invoker：

1.本地执行类的Invoker

2.远程通信的Invoker

3.多个远程通信执行类的Invoker聚合成集群版的Invoker