9.21. Telnet 命令扩展

所有服务器均支持 telnet 访问,用于人工干预。

扩展接口

org.apache.dubbo.remoting.telnet.TelnetHandler

扩展配置

<dubbo:protocol telnet="xxx,yyy" />
<!-- 缺省值设置,当<dubbo:protocol>没有配置telnet属性时,使用此配置 -->
<dubbo:provider telnet="xxx,yyy" />

已知扩展

  • org.apache.dubbo.remoting.telnet.support.ClearTelnetHandler
  • org.apache.dubbo.remoting.telnet.support.ExitTelnetHandler
  • org.apache.dubbo.remoting.telnet.support.HelpTelnetHandler
  • org.apache.dubbo.remoting.telnet.support.StatusTelnetHandler
  • org.apache.dubbo.rpc.dubbo.telnet.ListTelnetHandler
  • org.apache.dubbo.rpc.dubbo.telnet.ChangeTelnetHandler
  • org.apache.dubbo.rpc.dubbo.telnet.CurrentTelnetHandler
  • org.apache.dubbo.rpc.dubbo.telnet.InvokeTelnetHandler
  • org.apache.dubbo.rpc.dubbo.telnet.TraceTelnetHandler
  • org.apache.dubbo.rpc.dubbo.telnet.CountTelnetHandler
  • org.apache.dubbo.rpc.dubbo.telnet.PortTelnetHandler

扩展示例

  • Maven 项目结构:
    src
     |-main
        |-java
            |-com
                |-xxx
                    |-XxxTelnetHandler.java (实现TelnetHandler接口)
        |-resources
            |-META-INF
                |-dubbo
                    |-org.apache.dubbo.remoting.telnet.TelnetHandler (纯文本文件,内容为:xxx=com.xxx.XxxTelnetHandler)
    
  • XxxTelnetHandler.java:
    package com.xxx;
    import org.apache.dubbo.remoting.telnet.TelnetHandler;
    @Help(parameter="...", summary="...", detail="...")
    public class XxxTelnetHandler implements TelnetHandler {
        public String telnet(Channel channel, String message) throws RemotingException {
            // ...
        }
    }
    
  • META-INF/dubbo/org.apache.dubbo.remoting.telnet.TelnetHandler:
    xxx=com.xxx.XxxTelnetHandler
    

用法

telnet 127.0.0.1 20880
dubbo> xxx args
下一节:检查服务依赖各种资源的状态,此状态检查可同时用于 telnet 的 status 命令和 hosting 的 status 页面。