SOFARPC 简介
SOFARPC 是一个高可扩展性、高性能、生产级的 Java RPC 框架。在蚂蚁金服 SOFARPC 已经经历了十多年及五代版本的发展。SOFA RPC 致力于简化应用之间的 RPC 调用，为应用提供方便透明、稳定高效的点对点远程服务调用方案。为了用户和开发者方便的进行功能扩展，SOFARPC 提供了丰富的模型抽象和可扩展接口，包括过滤器、路由、 负载均衡 等等。同时围绕 SOFARPC 框架及其周边组件提供丰富的微服务治理方案。
功能特性
- 透明化、高性能的远程服务调用
- 支持多种服务路由及负载均衡策略
- 支持多种注册中心的集成
- 支持多种协议，包括 Bolt、Rest、 Dubbo 等
- 支持同步、单向、回调、泛化等多种调用方式
- 支持集群容错、服务预热、自动故障隔离
- 强大的扩展功能，可以按需扩展各个功能组件
开发环境支持
1、编译需要 JDK 7 及以上、Maven 3.2.5 及以上
2、运行需求 JDK 6 及以上
基本原理
1、当一个 SOFARPC 的应用启动的时候，如果发现当前应用需要发布 RPC 服务的话，那么 SOFARPC 会将这些服务注册到服务注册中心上。如图中 Service 指向 Registry。
2、当引用这个服务的 SOFARPC 应用启动时，会从服务注册中心订阅到相应服务的 元数据 信息。服务注册中心收到订阅请求后，会将发布方的元数据列表实时推送给服务引用方。如图中 Registry 指向 Reference。
3、当服务引用方拿到 地址 以后，就可以从中选取地址发起调用了。如图中 Reference 指向 Service。
快速开始
演示如何应用 SOFARPC 进行服务的发布和引用。 本例将在本地模拟服务端启动监听一个端口并发布一个服务，客户端引用该服务进行直连调用。
第一步：新建一个 Maven 工程，并引入 SOFARPC 的依赖
<dependency> <groupId>com.alipay.sofa</groupId> <artifactId>sofa-rpc-all</artifactId> <version>5.5.3</version> </dependency>
版本下载地址：
第二步：编写服务端实现
创建接口HelloService
/**
* Quick Start demo interface
*/public interface HelloService {
String sayHello(String string);
}
创建接口实现HelloServiceImpl
/**
* Quick Start demo implement
*/public class HelloServiceImpl implements HelloService {
@Override
public String sayHello(String string) {
System.out.println("Server receive: " + string);
return "hello " + string + " ！";
}
}
编写服务端代码
/**
* Quick Start Server
*/public class QuickStartServer {
public static void main(String[] args) {
ServerConfig serverConfig = new ServerConfig()
.setProtocol("bolt") // 设置一个协议，默认bolt
.setPort(12200) // 设置一个端口，默认12200
.setDaemon(false); // 非守护线程
ProviderConfig<HelloService> providerConfig = new ProviderConfig<HelloService>()
.setInterfaceId(HelloService.class.getName()) // 指定接口
.setRef(new HelloServiceImpl()) // 指定实现
.setServer(serverConfig); // 指定服务端
providerConfig.export(); // 发布服务
}
}
编写客户端实现
/**
* Quick Start client
*/public class QuickStartClient {
public static void main(String[] args) {
ConsumerConfig<HelloService> consumerConfig = new ConsumerConfig<HelloService>()
.setInterfaceId(HelloService.class.getName()) // 指定接口
.setProtocol("bolt") // 指定协议
.setDirectUrl("bolt://127.0.0.1:12200"); // 指定直连地址
// 生成代理类
HelloService helloService = consumerConfig.refer();
while (true) {
System.out.println(helloService.sayHello("world"));
try {
Thread.sleep(2000);
} catch (Exception e) {
}
}
}
}
运行
分别启动服务端和客户端，观察运行效果。
服务端将打印：
Server receive: world
客户端将打印：
hello world ！
小结
是不是发现，SOFA-RPC 与Dubbo、Motan 并无太大的区别。Dubbo 作为整套服务治理而存在，而 SOFA-RPC 只是一款轻量级的 RPC 框架，基于 HSF 框架改造，提供更加完善、强大的、多样化 RPC 编程 API。
最新版本v5.5.3发布内容
SOFARPC v5.5.3这是一个 Bug Fix 的版本，鼓励目前正在使用 5.5.x 版本的用户升级。
1、兼容性
没有不兼容问题
3、BUG 修复
- 修复特殊场景下路由重复的问题
- 兼容 Tracer 的采样标识
- 修复泛化调用再次重试的问题
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