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基于zookeeper实现分布式配置中心(二)

小眼儿 2019-06-06 08:43:00 阅读数:198 评论数:0 点赞数:0 收藏数:0

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onApplicationEvent(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。

版权声明
本文为[胡峻峥]所创,转载请带上原文链接,感谢
https://www.cnblogs.com/hujunzheng/p/10932153.html

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