motan服务export流程分析

首先来看一段export服务的demo代码：

        ServiceConfig<MotanDemoService> motanDemoService = new ServiceConfig<>();

        // 设置接口及实现类
        motanDemoService.setInterface(MotanDemoService.class);
        motanDemoService.setRef(new MotanDemoServiceImpl());

        // 配置服务的group以及版本号
        motanDemoService.setGroup("motan-demo-rpc");
        motanDemoService.setVersion("1.0");


        // 配置注册中心直连调用
        // RegistryConfig directRegistry = new RegistryConfig();
        // directRegistry.setRegProtocol("local");
        // directRegistry.setCheck("false"); //不检查是否注册成功
        // motanDemoService.setRegistry(directRegistry);

        // 配置ZooKeeper注册中心
        RegistryConfig zookeeperRegistry = new RegistryConfig();
        zookeeperRegistry.setRegProtocol("zookeeper");
        zookeeperRegistry.setAddress("127.0.0.1:2181");
        motanDemoService.setRegistry(zookeeperRegistry);

        // 配置RPC协议
        ProtocolConfig protocol = new ProtocolConfig();
        protocol.setId("motan");
        protocol.setName("motan");
        motanDemoService.setProtocol(protocol);

        motanDemoService.setApplication("motan");
        motanDemoService.setExport("motan:8002");
        motanDemoService.export();

        MotanSwitcherUtil.setSwitcherValue(MotanConstants.REGISTRY_HEARTBEAT_SWITCHER, true);

        System.out.println("server start...");

 服务配置的组装过程中设置了注册配置和协议配置，整体的类图如下：

 这里最关键的方法就是export方法了，所有需要的配置信息已经组装完毕，开始暴露服务了。

    public synchronized void export() {
　　　　 //检查状态，避免重复export
        if (exported.get()) {
            LoggerUtil.warn(String.format("%s has already been expoted, so ignore the export request!", interfaceClass.getName()));
            return;
        }
　　　　 //检查接口和方法
        checkInterfaceAndMethods(interfaceClass, methods);

　　　　 //解析出注册地址 zookeeper://127.0.0.1:2181/com.weibo.api.motan.registry.RegistryService?group=default_rpc
        List<URL> registryUrls = loadRegistryUrls();
        if (registryUrls == null || registryUrls.size() == 0) {
            throw new IllegalStateException("Should set registry config for service:" + interfaceClass.getName());
        }

        Map<String, Integer> protocolPorts = getProtocolAndPort();
        for (ProtocolConfig protocolConfig : protocols) {
            Integer port = protocolPorts.get(protocolConfig.getId());
            if (port == null) {
                throw new MotanServiceException(String.format("Unknow port in service:%s, protocol:%s", interfaceClass.getName(),
                        protocolConfig.getId()));
            }
　　　　　　　//真正的export
            doExport(protocolConfig, port, registryUrls);
        }

        afterExport();
    }