Information Exchange Extension

Information Exchange Extension

Extension Description

Implement the Request-Response information exchange semantics based on the transport layer.

Extension Interfaces

  • org.apache.dubbo.remoting.exchange.Exchanger
  • org.apache.dubbo.remoting.exchange.ExchangeServer
  • org.apache.dubbo.remoting.exchange.ExchangeClient

Extension Configuration

  1. <dubbo:protocol exchanger="xxx" />
  2. <!-- Default value setting, when <dubbo:protocol> does not configure the exchanger attribute, this configuration is used -->
  3. <dubbo:provider exchanger="xxx" />

Known Extension

org.apache.dubbo.remoting.exchange.exchanger.HeaderExchanger

Extension Example

Maven project structure:

  1. src
  2.  |-main
  3.     |-java
  4.         |-com
  5.             |-xxx
  6.                 |-XxxExchanger.java (implements Exchanger interface)
  7.                 |-XxxExchangeServer.java (implements ExchangeServer interface)
  8.                 |-XxxExchangeClient.java (implements ExchangeClient interface)
  9.     |-resources
  10.         |-META-INF
  11.             |-dubbo
  12.                 |-org.apache.dubbo.remoting.exchange.Exchanger (plain text file, content: xxx=com.xxx.XxxExchanger)

XxxExchanger.java：

  1. package com.xxx;
  3. import org.apache.dubbo.remoting.exchange.Exchanger;
  6. public class XxxExchanger implements Exchanger {
  7.     public ExchangeServer bind(URL url, ExchangeHandler handler) throws RemotingException {
  8.         return new XxxExchangeServer(url, handler);
  9.     }
  10.     public ExchangeClient connect(URL url, ExchangeHandler handler) throws RemotingException {
  11.         return new XxxExchangeClient(url, handler);
  12.     }
  13. }

XxxExchangeServer.java：

  2. package com.xxx;
  4. import org.apache.dubbo.remoting.exchange.ExchangeServer;
  6. public class XxxExchangeServer impelements ExchangeServer {
  7.     // ...
  8. }

XxxExchangeClient.java：

  1. package com.xxx;
  3. import org.apache.dubbo.remoting.exchange.ExchangeClient;
  5. public class XxxExchangeClient impelments ExchangeClient {
  6.     // ...
  7. }

META-INF/dubbo/org.apache.dubbo.remoting.exchange.Exchanger：

  1. xxx=com.xxx.XxxExchanger

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Last modified September 30, 2024: Update & Translate Overview Docs (#3040) (d37ebceaea7)