1.GovernanceService

GovernanceService用于與配置中心的交互

public interface GovernanceService {
   
    void getConfig(String dataId, String uniqueName, String group, GovernanceListener listener, String errorMsg);

    void getConfigSync(String dataId, String uniqueName, String group, GovernanceListener listener, String errorMsg);

    String getConfig(String dataId, String uniqueName, String group, long timeoutMs, String errorMsg);

    void unRegister(String dataId, String group);
}

2.Diamond服務器

默認實現為Diamond實現,所以在使用時，需要預先啟動一個Diamond服務器端配置中心

參考阿里云文檔:
https://help.aliyun.com/document_detail/44163.html

安裝成功后,本地打開地址:http://jmenv.tbsite.net:8080/#/dsConfig

3.GovernanceListener監聽配置文件變化

原生調用Diamond的addListener靜態方法,也可以使用GovernanceListener接口,內部實現回調

public class GovernanceServiceTest {

    @Test
    public void test1() throws IOException {
        GovernanceService service = HSFServiceContainer.getInstance(GovernanceService.class);

        String val=service.getConfig("com.alibaba.edas.carshop.itemcenter.ItemService:1.0.0","","HSF",100,"");

        Diamond.addListener("com.alibaba.edas.carshop.itemcenter.ItemService:1.0.0", "HSF", new ManagerListenerAdapter() {

            public void receiveConfigInfo(String s) {

            }
        });
        service.unRegister("com.seven:1.0.0","test");


        service.getConfig("com.alibaba.edas.carshop.itemcenter.ItemService:1.0.0", "uniqueName", "HSF", new GovernanceListener() {
            public void process(String s, String s1) {

            }
        },"errorMsg");

        System.in.read();

    }
}

當配置內容發生變更時,就會收到回調監聽

4.使用場景

GovernanceService的使用非常廣泛,可以用于動態配置變更的場景,

image.png

如下示例

public class MachineRoomRuleComponent implements ServiceComponent, GovernanceListener {
    private GovernanceService governanceService;
    private Config config = ((ConfigService)HSFServiceContainer.getInstance(ConfigService.class)).getConfig();

    public MachineRoomRuleComponent() {
        this.governanceService = (GovernanceService)HSFServiceContainer.getInstance(GovernanceService.class, this.config.getString("hsf.governance.type"));
    }

    public void init(ServiceMetadata serviceMetadata) {
        String dataId = serviceMetadata.getUniqueName() + ".RULES";
        String group = serviceMetadata.getGroup();
        String serviceUniqueName = serviceMetadata.getUniqueName();
        if (this.governanceService != null) {
            this.governanceService.getConfig(dataId, serviceUniqueName, group, this, "[MachineRoomRule Component] Failed to process rule");
        }
    }

    public void process(String uniqueName, String configInfo) {
        this.registerRule(uniqueName, configInfo);
    }