ServiceMetadata是一个很重要的概念,其存储着Provider和Consumer相关的信息

1.ServiceMetadataBeforeInit接口

在ServiceMetadata的init方法开始时调用,意图很明显,即在init之前再对ServiceMetadata做处理

public interface ServiceMetadataBeforeInit {
    void beforeInit(ServiceMetadata var1);
}

有4个实现,分别如下

1. EdasInvokeTypeServiceMetadataBeforeInit

根据invokeType添加Registry

    public void beforeInit(ServiceMetadata serviceMetadata) {
        String invokeType = (String)serviceMetadata.getAttachment("service.invoke.type");
        if (StringUtils.isEmpty(invokeType)) {
            invokeType = System.getProperty("service.invoke.type", "HSF");
        }
        if (invokeType.equalsIgnoreCase("DUBBO")) {
            List<Registry> registries = new ArrayList();
            DubboRegistry dubboRegistry = new DubboRegistry();
            registries.add(dubboRegistry);
            serviceMetadata.setRegistries(registries);
        } else if (invokeType.equalsIgnoreCase("HSF,DUBBO") || invokeType.equalsIgnoreCase("DUBBO,HSF")) {
            serviceMetadata.putAttachment("addExtraDubboRegistry", true);
        }
    }

2. DefaultServiceMetadataBeforeInit

添加默认的Registry和Protocol

    public void beforeInit(ServiceMetadata serviceMetadata) {
        List<Registry> registries = serviceMetadata.getRegistries();
        if (registries == null) {
            registries = new ArrayList();
        }
        if (((List)registries).isEmpty()) {
            Registry registry = (Registry)HSFServiceContainer.getInstance(Registry.class, this.config.getString("hsf.registry.default"));
            if (registry != null) {
                ((List)registries).add(registry);
            }
        }
        serviceMetadata.setRegistries((List)registries);
        List<Protocol> protocols = serviceMetadata.getProtocols();
        if (protocols == null) {
            protocols = new ArrayList();
        }
        if (((List)protocols).isEmpty()) {
            ((List)protocols).addAll(HSFServiceContainer.getInstances(Protocol.class, new String[0]));
        }
        serviceMetadata.setProtocols((List)protocols);
    }

3. EdasServiceMetadataBeforeInit

对参数做检查补充

4. ExtraDubboRegistryServiceMetadataBeforeInit

根据EdasInvokeTypeServiceMetadataBeforeInit添加的参数补充添加DubboRegistry

    public void beforeInit(ServiceMetadata serviceMetadata) {
        Boolean flag = (Boolean)serviceMetadata.getAttachment("addExtraDubboRegistry");
        if (flag != null && flag) {
            boolean exist = false;
            Iterator i$ = serviceMetadata.getRegistries().iterator();

            while(i$.hasNext()) {
                Registry registry = (Registry)i$.next();
                if (registry instanceof DubboRegistry) {
                    exist = true;
                    break;
                }
            }
            if (!exist) {
                serviceMetadata.getRegistries().add(new DubboRegistry());
            }
        }
    }