基于zookeeper实现分布式配置中心（二）

　　上一篇（基于zookeeper实现分布式配置中心（一））讲述了zookeeper相关概念和工作原理。接下来根据zookeeper的特性，简单实现一个分布式配置中心。

配置中心的优势

1、各环境配置集中管理。

2、配置更改，实时推送，jvm环境变量及时生效。

3、依靠配置变更，动态扩展功能，减少二次上线带来的成本。

4、减少开发人员、运维人员修改配置带来的额外开销。

 配置中心架构图

　　

配置中心功能

1、配置管理平台中，操作人员可以创建项目所属系统、应用名称、实例名称、配置分组等信息。

2、配置管理平台中，操作人员可以上传配置文件，对属性有增、删、改、查的操作。

3、配置内容通过配置管理平台后台服务进行持久化（保存到数据库中）。

4、操作人员通过配置平台进行推送操作，将配置推送到zk集群相应结点（/cfgcenter/系统名称/应用名称/实例名称/分组名称）。

5、配置中心客户端监听zk集群中对应结点数据发生变化，读取变更后的内容，解析内容，刷新本地备份（分布式容灾）和Spring环境变量。

6、配置中心客户端如果和zk集群丢失连接，将加载本地本分配置到Spring环境变量。

7、配置中心客户端重新和zk集群建立连接，从zk集群中拉取最新配置内容，解析配置，刷新本地备份（分布式容灾）和Spring环境变量。

8、配置中心客户端将Spring环境变量刷新之后，动态刷新依赖配置中心配置的bean。

配置中心代码视图　　

　　

配置中心客户端设计解析

配置中心客户端初始化

@Component
public class CfgcenterInit implements ApplicationContextInitializer<ConfigurableWebApplicationContext>, ApplicationListener<ApplicationEvent> {

    private static Logger LOGGER = LoggerFactory.getLogger(CfgcenterInit.class);

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        if (event instanceof ContextRefreshedEvent) {
            LOGGER.info("初始化配置中心客户端监听器...");
            ZKClient.getInstance()
                    .init();
        } else if (event instanceof RefreshEvent) {
            ZKClient.getInstance()
                    .getAeb()
                    .post(event);
        } else if (event instanceof ContextClosedEvent) {
            if (null != ZKClient.getInstance().getCw()) {
                ZKClient.getInstance()
                        .getCw()
                        .close();
            }
        }
    }

    @Override
    public void initialize(ConfigurableWebApplicationContext cac) {
        try {
            ZookeeperProperties zookeeperProperties = ConfigurationBinder
                    .withPropertySources(cac.getEnvironment())
                    .bind(ZookeeperProperties.class);
            if (!zookeeperProperties.isEnabled()) {
                LOGGER.info("未开启配置中心客戶端...");
                return;
            }
            ZKClient.getInstance()
                    .binding(
                            zookeeperProperties
                            , new ZookeeperConfigProperties()
                            , cac
                    );
        } catch (Exception e) {
            LOGGER.error("配置中心客户端初始化异常...", e);
        }
    }
}

1、ApplicationContextInitializer#initialize方法中，获取zk连接信息配置，如果开启配置中心客户端，将ZookeeperProperties（zk集群连接信息）、ZookeeperConfigProperties（客户端监听zk集群结点信息）、ConfigurableWebApplicationContext （应用上下文）绑定到ZKClient实例中去。

2、ApplicationListener#onApplicationEvent方法中监听ContextRefreshedEvent（初始化配置中心客户端监听器）、RefreshEvent（配置刷新事件，通过guava的事件总线进行推送）、ContextClosedEvent（关闭配置中心客户端资源）。

配置中心客户端监听器

public class ConfigWatcher implements Closeable, TreeCacheListener {

    private static Logger LOGGER = LoggerFactory.getLogger(ConfigWatcher.class);

    private AtomicBoolean running = new AtomicBoolean(false);
    private String context;
    private CuratorFramework source;
    private HashMap<String, TreeCache> caches;

    public ConfigWatcher(String context, CuratorFramework source) {
        this.context = context;
        this.source = source;
    }

    public void start() {
        if (this.running.compareAndSet(false, true)) {
            this.caches = new HashMap<>();
            if (!context.startsWith("/")) {
                context = "/" + context;
            }
            try {
                TreeCache cache = TreeCache.newBuilder(this.source, context).build();
                cache.getListenable().addListener(this);
                cache.start();
                this.caches.put(context, cache);
                // no race condition since ZookeeperAutoConfiguration.curatorFramework
                // calls curator.blockUntilConnected
            } catch (KeeperException.NoNodeException e) {
                // no node, ignore
            } catch (Exception e) {
                LOGGER.error("Error initializing listener for context " + context, e);
            }
        }
    }

    @Override
    public void close() {
        if (this.running.compareAndSet(true, false)) {
            for (TreeCache cache : this.caches.values()) {
                cache.close();
            }
            this.caches = null;
        }
    }

    @Override
    public void childEvent(CuratorFramework client, TreeCacheEvent event) {
        TreeCacheEvent.Type eventType = event.getType();
        switch (eventType) {
            case INITIALIZED:
                LOGGER.info("配置中心客户端同步服务端状态完成...");
                refreshEnvAndBeans(event);
                break;
            case NODE_REMOVED:
            case NODE_UPDATED:
                refreshEnvAndBeans(event);
                break;
            case CONNECTION_SUSPENDED:
            case CONNECTION_LOST:
                LOGGER.info("配置中心客户端与服务端连接异常...");
                break;
            case CONNECTION_RECONNECTED:
                LOGGER.info("配置中心客户端与服务端重新建立连接...");
                break;
        }
    }

    private void refreshEnvAndBeans(TreeCacheEvent event) {
        //刷新环境变量
        ZKClient.getInstance()
                .refreshEnvironment();
        //刷新Bean
        ZKClient.getInstance()
                .getAep()
                .publishEvent(
                        new RefreshEvent(this, event, getEventDesc(event))
                );
    }

    private String getEventDesc(TreeCacheEvent event) {
        StringBuilder out = new StringBuilder();
        out.append("type=").append(event.getType());
        TreeCacheEvent.Type eventType = event.getType();
        if (eventType == NODE_UPDATED
                || eventType == NODE_REMOVED) {
            out.append(", path=").append(event.getData().getPath());
            byte[] data = event.getData().getData();
            if (data != null) {
                out.append(", data=").append(new String(data, StandardCharsets.UTF_8));
            }
        }
        return out.toString();
    }
}

1、通过TreeCache监听路径/cfgcenter/系统名称/应用名称/实例名称/分组名称（该路径下可能会存在多个子节点，每个子节点对应一份配置，每一份配置大小不能超过64k）。

2、TreeCache监听事件类型如下

• INITIALIZED（完成同步服务端状态，同步状态【NODE_REMOVED、 NODE_UPDATED、CONNECTION_RECONNECTED】之后触发）
• NODE_REMOVED（结点移除触发）
• NODE_UPDATED（结点数据更新触发）
• CONNECTION_SUSPENDED（连接丢失触发）
• CONNECTION_LOST（完全丢失连接触发）
• CONNECTION_RECONNECTED（重新连接触发）

3、监听到INITIALIZED、NODE_UPDATED、NODE_REMOVED事件之后，执行refreshEnvAndBeans方法，刷新spring环境变量，同时刷新spring容器相关的Bean。

 配置中心客户端刷新spring环境变量

public class ZookeeperPropertySourceLocator {

    public static final String ZOOKEEPER_PREPERTY_SOURCE_NAME = "cfg-zookeeper";

    private ZookeeperConfigProperties properties;

    private CuratorFramework curator;

    private static Logger LOGGER = LoggerFactory.getLogger(ZookeeperPropertySourceLocator.class);

    public ZookeeperPropertySourceLocator(CuratorFramework curator, ZookeeperConfigProperties properties) {
        this.curator = curator;
        this.properties = properties;
    }

    public String getContext() {
        return this.properties.getContext();
    }

    public PropertySource getCfgcenterPropertySource(Environment environment) {
        ConfigurableEnvironment env = (ConfigurableEnvironment) environment;
        return env.getPropertySources().get(ZOOKEEPER_PREPERTY_SOURCE_NAME);
    }

    public void locate(Environment environment) {
        if (environment instanceof ConfigurableEnvironment) {
            ConfigurableEnvironment env = (ConfigurableEnvironment) environment;
            String context = properties.getContext();
            CompositePropertySource composite = new CompositePropertySource(ZOOKEEPER_PREPERTY_SOURCE_NAME);
            try {
                PropertySource propertySource = create(context);
                composite.addPropertySource(propertySource);
                if (null != env.getPropertySources().get(ZOOKEEPER_PREPERTY_SOURCE_NAME)) {
                    LOGGER.info("替换PropertySource: " + ZOOKEEPER_PREPERTY_SOURCE_NAME);
                    env.getPropertySources().replace(ZOOKEEPER_PREPERTY_SOURCE_NAME, composite);
                } else {
                    LOGGER.info("添加PropertySource: " + ZOOKEEPER_PREPERTY_SOURCE_NAME);
                    env.getPropertySources().addFirst(composite);
                }
            } catch (Exception e) {
                if (this.properties.isFailFast()) {
                    ReflectionUtils.rethrowRuntimeException(e);
                } else {
                    LOGGER.error("Unable to load zookeeper config from " + context, e);
                }
            }
        }
    }

    @PreDestroy
    public void destroy() {
    }

    private void backupZookeeperPropertySource(ZookeeperPropertySource zps) {
        String backupDir = BASE_BACKUP_DIR + this.properties.getContext();
        String backupFile = String.format("%s/%s", backupDir, APP_NAME + ".properties");
        File bakFile = new File(backupFile);
        StringBuilder data = new StringBuilder();
        for (String propertyName : zps.getPropertyNames()) {
            data.append(propertyName)
                    .append("=")
                    .append(zps.getProperty(propertyName))
                    .append(System.lineSeparator());
        }
        try {
            FileUtils.writeStringToFile(bakFile, data.toString(), Charsets.UTF_8);
            LOGGER.info("配置中心客户端刷新本地备份完成, path: " + backupDir);
        } catch (IOException e) {
            LOGGER.error("配置中心客户端刷新本地备份异常..., path: " + backupDir, e);
        }
    }

    private PropertySource<CuratorFramework> create(String context) {
        ZookeeperPropertySource zps;
        if (ZKClient.getInstance().isConnected()) {
            zps = new ZookeeperPropertySource(context, this.curator, false);
            this.backupZookeeperPropertySource(zps);
        } else {
            zps = new ZookeeperPropertySource(context, this.curator, true);
        }
        return zps;
    }
}

ZookeeperPropertySourceLocator会创建ZookeeperPropertySource，然后放入Spring的Environment变量中。如果配置中心客户端和zk集群处于连接状态，加载完ZookeeperPropertySource之后，备份到本地。

public class ZookeeperPropertySource extends AbstractZookeeperPropertySource {

    private static Logger LOGGER = LoggerFactory.getLogger(ZookeeperPropertySource.class);

    private Map<String, String> properties = new LinkedHashMap<>();

    public ZookeeperPropertySource(String context, CuratorFramework source, boolean backup) {
        super(context, source);

        //加载本地配置
        if (backup) {
            String backupDir = BASE_BACKUP_DIR + this.getContext();
            String backupFile = String.format("%s/%s", backupDir, APP_NAME + ".properties");
            try {
                InputStream is = FileUtils.openInputStream(new File(backupFile));
                InputStreamReader isr = new InputStreamReader(is);
                Properties properties = new Properties();
                properties.load(isr);
                properties.forEach((k, v) -> this.properties.put((String) k, (String) v));
            } catch (Exception e) {
                LOGGER.error("配置中心客户端本地配置加载异常...", e);
            }

        }
        //加载远程配置
        else {
            findProperties(this.getContext(), null);
        }
    }

    @Override
    public Object getProperty(String name) {
        return this.properties.get(name);
    }

    private byte[] getPropertyBytes(String fullPath) {
        try {
            byte[] bytes = null;
            try {
                bytes = this.getSource().getData().forPath(fullPath);
            } catch (KeeperException e) {
                if (e.code() != KeeperException.Code.NONODE) {
                    throw e;
                }
            }
            return bytes;
        } catch (Exception exception) {
            ReflectionUtils.rethrowRuntimeException(exception);
        }
        return null;
    }

    @Override
    public String[] getPropertyNames() {
        Set<String> strings = this.properties.keySet();
        return strings.toArray(new String[strings.size()]);
    }

    private void findProperties(String path, List<String> children) {
        try {
            LOGGER.info("entering findProperties for path: " + path);
            if (children == null) {
                children = getChildren(path);
            }
            if (children == null || children.isEmpty()) {
                return;
            }
            for (String child : children) {
                String childPath = path + "/" + child;
                List<String> childPathChildren = getChildren(childPath);

                byte[] bytes = getPropertyBytes(childPath);
                if (!ArrayUtils.isEmpty(bytes)) {
                    registerKeyValue(childPath, new String(bytes, Charset.forName("UTF-8")));
                }
                // Check children even if we have found a value for the current znode
                findProperties(childPath, childPathChildren);
            }
            LOGGER.info("leaving findProperties for path: " + path);
        } catch (Exception exception) {
            ReflectionUtils.rethrowRuntimeException(exception);
        }
    }

    private void registerKeyValue(String path, String value) {
        String key = sanitizeKey(path);
        LOGGER.info(String.format("配置中心客户端解析配置节点(%s)，数据:%s", key, value));
        try {
            Properties properties = new Properties();
            properties.load(new StringReader(value));
            properties.forEach((k, v) -> this.properties.put((String) k, (String) v));
        } catch (IOException e) {
            LOGGER.info(String.format("配置中心客户端解析配置节点(%s)异常...", key));
        }
    }

    private List<String> getChildren(String path) throws Exception {
        List<String> children = null;
        try {
            children = this.getSource().getChildren().forPath(path);
        } catch (KeeperException e) {
            if (e.code() != KeeperException.Code.NONODE) {
                throw e;
            }
        }
        return children;
    }

}

ZookeeperPropertySource通过构造参数backup来判断是加载zk集群中的配置还是本地备份配置。

配置中心客户端刷新Spring容器Bean

public abstract class BaseCfgcenterBean implements InitializingBean {

    private static Logger LOGGER = LoggerFactory.getLogger(BaseCfgcenterBean.class);

    @PostConstruct
    public void init() {
        //注册到时间总线中
        ZKClient.getInstance()
                .getAeb()
                .register(this);
    }

    /**
     * z
     * 绑定自身目标
     **/
    protected void doBind() {
        Class<? extends BaseCfgcenterBean> clazz = this.getClass();
        if (org.springframework.util.ClassUtils.isCglibProxy(this)) {
            clazz = (Class<? extends BaseCfgcenterBean>) AopUtils.getTargetClass(this);
        }
        BaseCfgcenterBean target = binding(clazz, this.getDefaultResourcePath());
        this.copyProperties(target);
    }

    private void copyProperties(BaseCfgcenterBean target) {
        ReflectionUtils.doWithFields(this.getClass(), field -> {
            field.setAccessible(true);
            field.set(this, field.get(target));
        }, field -> AnnotatedElementUtils.isAnnotated(field, ConfigField.class));
    }

    /**
     * 绑定其他目标
     *
     * @param clazz 目标类
     **/
    protected <T> T doBind(Class<T> clazz) {
        T target = binding(clazz, this.getDefaultResourcePath());
        if (target instanceof InitializingBean) {
            try {
                ((InitializingBean) target).afterPropertiesSet();
            } catch (Exception e) {
                LOGGER.error(String.format("属性初始化失败[afterPropertiesSet]， class=%s", ClassUtils.getSimpleName(clazz), e));
            }
        }
        return target;
    }

    private <T> T binding(Class<T> clazz, String defaultResourcePath) {
        Optional<PropertySource> propertySource = Optional.empty();

        //加载配置中心配置
        if (ZKClient.getInstance().isZkInit()) {
            propertySource = Optional.ofNullable(
                    ZKClient.getInstance()
                            .resolvePropertySource()
            );
        }
        //加载本地配置
        else {
            Optional<ResourcePropertySource> resourcePropertySource = ResourceUtils.getResourcePropertySource(defaultResourcePath);
            if (resourcePropertySource.isPresent()) {
                propertySource = Optional.ofNullable(resourcePropertySource.get());
            }
        }
        if (propertySource.isPresent()) {
            T target;
            try {
                target = ConfigurationBinder
                        .withPropertySources(propertySource.get())
                        .bind(clazz);
            } catch (Exception e) {
                LOGGER.error(String.format("属性绑定失败， class=%s", ClassUtils.getSimpleName(clazz)), e);
                return null;
            }
            return target;
        }
        return null;
    }


    @Override
    public void afterPropertiesSet() {
        Class<?> target = this.getClass();
        if (AopUtils.isAopProxy(this)) {
            target = AopUtils.getTargetClass(this);
        }
        LOGGER.info(String.format("%s->%s模块引入配置中心%s..."
                , this.getModuleName()
                , ClassUtils.getSimpleName(target)
                , (ZKClient.getInstance()
                        .isConnected() ? "生效" : "无效")
        ));
    }

    public String getModuleName() {
        return StringUtils.EMPTY;
    }

    @Subscribe
    public void listenRefreshEvent(RefreshEvent refreshEvent) {
        this.afterPropertiesSet();
        LOGGER.info(refreshEvent.getEventDesc());
        this.refresh();
    }

    //通过事件进行刷新
    protected void refresh() {
        this.doBind();
    }

    //获取本地配置默认路径
    protected abstract String getDefaultResourcePath();
}

1、对象自身实现guava事件总线监听，监听RefreshEvent事件，触发对象属性刷新操作。

2、对象初始化时，注册自身目标到guava的事件总线对象中。

3、对象属性刷新，获取到PropertySource对象（配置中心配置或者项目自身静态配置），通过ConfigurationBinder工具类将配置重新绑定的对象属性。

配置管理平台接口

@RestController
@RequestMapping("cfg")
public class CfgController {
    private static Logger LOGGER = LoggerFactory.getLogger(CfgController.class);

    private static final String ZK_PATH_PATTERN0 = "/wmhcfg/projects/%s/%s";
    private static final String ZK_PATH_PATTERN1 = ZK_PATH_PATTERN0 + "/%s";
    private static final String ZK_PATH_PATTERN = ZK_PATH_PATTERN1 + "/%s";

    @Autowired
    private CfgMapper mapper;

    @GetMapping(value = "/search", produces = MediaType.TEXT_PLAIN_VALUE)
    public String findCfgContents(@RequestBody @Validated SearchVO searchVO
            , @RequestParam(required = false) String cfgId) {
        List<CfgRecord> records = mapper.findRecords(searchVO);
        if (CollectionUtils.isEmpty(records)) {
            return StringUtils.EMPTY;
        }
        if (StringUtils.isNotBlank(cfgId)) {
            records = records.stream().filter(record -> cfgId.equals(record.getCfgId())).collect(Collectors.toList());
        }
        StringBuilder response = new StringBuilder();
        Properties properties = new Properties();
        records.forEach(record -> {
            try {
                properties.clear();
                properties.load(new StringReader(record.getCfgContent()));
                properties.forEach((key, value) -> response.append(key)
                        .append("=")
                        .append(value)
                        .append(System.lineSeparator())
                        .append(System.lineSeparator())
                );
            } catch (IOException e) {
                LOGGER.error("配置解析异常...", e);
            }
        });
        return response.toString();
    }

    @PostMapping(value = "/send/{systemId}/{appId}/{groupId}/{cfgId}", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public BaseResponse sendCfgContent(@RequestBody String cfgContent
            , @PathVariable String systemId
            , @PathVariable String appId
            , @PathVariable String groupId
            , @PathVariable String cfgId) {
        BaseResponse baseResponse = new BaseResponse();
        baseResponse.setRestStatus(RestStatus.SUCCESS);

        SearchVO searchVO = new SearchVO();
        searchVO.setSystemId(systemId);
        searchVO.setAppId(appId);
        searchVO.setGroupId(groupId);

        List<CfgRecord> records = mapper.findRecords(searchVO);
        CfgRecord record = null;

        if (!CollectionUtils.isEmpty(records)) {
            for (CfgRecord cfgRecord : records) {
                if (cfgId.equals(cfgRecord.getCfgId())) {
                    record = cfgRecord;
                    record.setCfgContent(cfgContent);
                    break;
                }
            }
        }

        if (null == record) {
            record = new CfgRecord();
            record.setSystemId(systemId);
            record.setAppId(appId);
            record.setGroupId(groupId);
            record.setCfgId(cfgId);
            record.setCfgContent(cfgContent);
        }

        StringBuilder cfgContentSB = new StringBuilder();
        Properties properties = new Properties();
        try {
            properties.load(new StringReader(record.getCfgContent()));
        } catch (IOException e) {
            LOGGER.error("配置解析异常...", e);
            baseResponse.setErrors(e.getMessage());
            baseResponse.setRestStatus(RestStatus.FAIL_50001);
            return baseResponse;
        }
        properties.forEach((key, value) -> cfgContentSB.append(key)
                .append("=")
                .append(value)
                .append(System.lineSeparator())
        );

        record.setCfgContent(cfgContentSB.toString());

        if (null == record.getId()) {
            mapper.insertRecord(record);
        } else {
            mapper.updateRecord(record);
        }
        return baseResponse;
    }

    @PostMapping(value = "/push", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public BaseResponse pushCfgContent(@RequestBody @Validated PushVO pushVO) {
        BaseResponse baseResponse = new BaseResponse();
        baseResponse.setRestStatus(RestStatus.SUCCESS);
        String path = String.format(ZK_PATH_PATTERN
                , pushVO.getSystemId()
                , pushVO.getAppId()
                , pushVO.getGroupId()
                , pushVO.getCfgId()
        );

        try {
            SearchVO searchVO = new SearchVO();
            searchVO.setSystemId(pushVO.getSystemId());
            searchVO.setAppId(pushVO.getAppId());
            searchVO.setGroupId(pushVO.getGroupId());

            List<CfgRecord> records = mapper.findRecords(searchVO);
            StringBuilder cfgContent = new StringBuilder();
            records.forEach(record -> cfgContent.append(record.getCfgContent()).append(System.lineSeparator()));
            if (!ZKHelper.setData(path, cfgContent.toString().getBytes())) {
                baseResponse.setRestStatus(RestStatus.FAIL_50001);
            }
        } catch (Exception e) {
            LOGGER.error("配置推送异常...", e);
            baseResponse.setRestStatus(RestStatus.FAIL_50001);
            baseResponse.setErrors(e.getMessage());
        }
        return baseResponse;
    }

    @PostMapping(value = "/create", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public BaseResponse createCfg(@RequestBody @Validated PushVO pushVO) {
        BaseResponse baseResponse = new BaseResponse();
        String path = String.format(ZK_PATH_PATTERN
                , pushVO.getSystemId()
                , pushVO.getAppId()
                , pushVO.getGroupId()
                , pushVO.getCfgId()
        );
        if (ZKHelper.createPath(path)) {
            baseResponse.setRestStatus(RestStatus.SUCCESS);
        } else {
            baseResponse.setRestStatus(RestStatus.FAIL_50001);
        }
        return baseResponse;
    }

    @PostMapping(value = "/delete", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public BaseResponse deleteCfg(@RequestBody @Validated DeleteVO deleteVO) {
        BaseResponse baseResponse = new BaseResponse();
        String path;
        if (StringUtils.isBlank(deleteVO.getGroupId())) {
            path = String.format(ZK_PATH_PATTERN0
                    , deleteVO.getSystemId()
                    , deleteVO.getAppId()
            );
        } else if (StringUtils.isNotBlank(deleteVO.getGroupId()) && StringUtils.isBlank(deleteVO.getCfgId())) {
            path = String.format(ZK_PATH_PATTERN1
                    , deleteVO.getSystemId()
                    , deleteVO.getAppId()
                    , deleteVO.getGroupId()
            );
        } else {
            path = String.format(ZK_PATH_PATTERN
                    , deleteVO.getSystemId()
                    , deleteVO.getAppId()
                    , deleteVO.getGroupId()
                    , deleteVO.getCfgId()
            );
        }

        if (ZKHelper.deletePath(path)) {
            baseResponse.setRestStatus(RestStatus.SUCCESS);
        } else {
            baseResponse.setRestStatus(RestStatus.FAIL_50001);
        }
        return baseResponse;
    }

    @GetMapping(value = "/getdata", produces = MediaType.TEXT_PLAIN_VALUE)
    public String getData(@RequestParam String path) {
        return ZKHelper.getData(path);
    }
}

　　为配置管理前端提供配置保存、配置推送、配置删除等操作。

配置中心测试

@Component
@ConfigurationProperties(prefix = "cfg.test")
public class TestCfgcenterBean extends BaseCfgcenterBean {

    @ConfigField
    private String text;

    @ConfigField
    private Map<String, List<String>> map;

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public Map<String, List<String>> getMap() {
        return map;
    }

    public void setMap(Map<String, List<String>> map) {
        this.map = map;
    }

    @Override
    protected String getDefaultResourcePath() {
        return StringUtils.EMPTY;
    }

    @Override
    protected void refresh() {
        super.refresh();
        System.out.println("text=" + this.text);
        System.out.println("map=" + JSON.toJSONString(map));
    }
}

TestCfgcenterBean继承BaseCfgcenterBean，配置中心配置变更后可以自动将新的配置绑定到对象上。

@SpringBootApplication(exclude = RedissonAutoConfiguration.class)
@EnableAspectJAutoProxy(proxyTargetClass = true, exposeProxy = true)
@EnableRetry
public class SpringbootApplication {

    public static void main(String[] args) {
        System.setProperty("xxx.system.id", "test_system");
        System.setProperty("xxx.app.id", "test_app");
        System.setProperty("groupenv", "x");
        SpringApplication.run(SpringbootApplication.class, args);
    }

}

启动类设置配置中心客户端需要的环境变量：系统标识、项目标识、分组标识。

 客户端与zk第一建立连接，同步完状态之后，触发INITIALIZED事件，刷新bean属性配置。

客户端与zk断开重连之后，同步完状态后触发INITIALIZED事件，刷新bean属性配置。

需要源码

请关注订阅号，回复：cfgcenter， 便可查看。