Transporter Extension

Summary

Transportation extension for communication between server and client.

Extension Interface

  • com.alibaba.dubbo.remoting.Transporter
  • com.alibaba.dubbo.remoting.Server
  • com.alibaba.dubbo.remoting.Client

Extension Configuration

<!-- server and client use the same transporter -->
<dubbo:protocol transporter="xxx" /> 
<!-- server and client use the different transporter -->
<dubbo:protocol server="xxx" client="xxx" /> 
<!-- default configuration, will take effect when transport/server/client attribute is not set in <dubbo:protocol> -->
<dubbo:provider transporter="xxx" server="xxx" client="xxx" />

Existing Extension

  • com.alibaba.dubbo.remoting.transport.transporter.netty.NettyTransporter
  • com.alibaba.dubbo.remoting.transport.transporter.mina.MinaTransporter
  • com.alibaba.dubbo.remoting.transport.transporter.grizzly.GrizzlyTransporter

Extension Guide

Directory layout:

src
 |-main
    |-java
        |-com
            |-xxx
                |-XxxTransporter.java (Transporter implementation)
                |-XxxServer.java (Server implementation)
                |-XxxClient.java (Client implementation)
    |-resources
        |-META-INF
            |-dubbo
                |-com.alibaba.dubbo.remoting.Transporter (plain text file with the content: xxx=com.xxx.XxxTransporter)

XxxTransporter.java:

package com.xxx;

import com.alibaba.dubbo.remoting.Transporter;

public class XxxTransporter implements Transporter {
    public Server bind(URL url, ChannelHandler handler) throws RemotingException {
        return new XxxServer(url, handler);
    }
    public Client connect(URL url, ChannelHandler handler) throws RemotingException {
        return new XxxClient(url, handler);
    }
}

XxxServer.java:

package com.xxx;

import com.alibaba.dubbo.remoting.transport.transporter.AbstractServer;

public class XxxServer extends AbstractServer {
    public XxxServer(URL url, ChannelHandler handler) throws RemotingException{
        super(url, handler);
    }
    protected void doOpen() throws Throwable {
        // ...
    }
    protected void doClose() throws Throwable {
        // ...
    }
    public Collection<Channel> getChannels() {
        // ...
    }
    public Channel getChannel(InetSocketAddress remoteAddress) {
        // ...
    }
}

XxxClient.java:

package com.xxx;

import com.alibaba.dubbo.remoting.transport.transporter.AbstractClient;

public class XxxClient extends AbstractClient {
    public XxxServer(URL url, ChannelHandler handler) throws RemotingException{
        super(url, handler);
    }
    protected void doOpen() throws Throwable {
        // ...
    }
    protected void doClose() throws Throwable {
        // ...
    }
    protected void doConnect() throws Throwable {
        // ...
    }
    public Channel getChannel() {
        // ...
    }
}

META-INF/dubbo/com.alibaba.dubbo.remoting.Transporter:

xxx=com.xxx.XxxTransporter

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