这期内容当中小编将会给大家带来有关zk中怎么通过监听读取配置信息,文章内容丰富且以专业的角度为大家分析和叙述,阅读完这篇文章希望大家可以有所收获。
import com.alibaba.fastjson.JSON; import com.google.common.collect.Maps; import lombok.extern.slf4j.Slf4j; import org.apache.zookeeper.CreateMode; import org.apache.zookeeper.WatchedEvent; import org.apache.zookeeper.Watcher; import org.apache.zookeeper.ZooDefs; import org.apache.zookeeper.ZooKeeper; import org.apache.zookeeper.data.Stat; import java.io.IOException; import java.util.Map; import java.util.concurrent.ConcurrentMap; import java.util.concurrent.CountDownLatch; import java.util.concurrent.atomic.AtomicInteger; @Slf4j public class ZkClientWatcher implements Watcher { private static final String CONNECT_ADDRESS = "10.10.136.114:2181,10.10.136.114:2182,10.10.136.114:2183"; private static final int SESSION_TIMEOUT = 2000; public static final int MAX = 3; private static String CONFIG_PATH = "/application-config"; private static ZooKeeper zk; private static CountDownLatch countDownLatch = new CountDownLatch(1); private static ConcurrentMap<String, String> oldConfig = Maps.newConcurrentMap(); private static ConcurrentMap<String, String> newConfig = Maps.newConcurrentMap(); private static AtomicInteger count = new AtomicInteger(1); public void createConnection(String connectAddres, int sessionTimeOut) throws InterruptedException { try { zk = new ZooKeeper(connectAddres, sessionTimeOut, this); log.info("zk connecting..."); } catch (IOException e) { e.printStackTrace(); } finally { } } public boolean createPath(String path, String data) { try { if (null == zk.exists(path, true)) { zk.create(path, data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL); log.info("node create success"); } } catch (Exception e) { e.printStackTrace(); return false; } return true; } @Override public void process(WatchedEvent event) { Event.KeeperState keeperState = event.getState(); Event.EventType eventType = event.getType(); String path = event.getPath(); log.info("process:{},keeperState:{},eventType:{},path:{}", keeperState, eventType, path); if (Event.KeeperState.SyncConnected == keeperState) { if (Event.EventType.None == eventType) { log.info("now status is None"); } else if (Event.EventType.NodeCreated == eventType) { log.info("now status is nodeCreated,path:{}", path); } else if (Event.EventType.NodeDataChanged == eventType) { log.info("now status is nodedataChanged:{}", path); try { newConfig = JSON.parseObject(zk.getData(path, true, new Stat()), ConcurrentMap.class); log.info("newConfig is {}", newConfig); count.getAndIncrement(); if (count.get() > MAX) { countDownLatch.countDown(); } } catch (Exception e) { log.error("get data from zk occur exception", e); } } else if (Event.EventType.NodeDeleted == eventType) { log.info("now status is node deleted:{}", path); } } } public static void main(String[] args) throws Exception { ZkClientWatcher watcher = new ZkClientWatcher(); watcher.createConnection(CONNECT_ADDRESS, SESSION_TIMEOUT); createPathAndInitData(watcher); getOldConfig(); countDownLatch.await(); log.info("test complete!config has changed 3 times"); } /** * 第一次获取配置信息 * * @throws Exception */ private static void getOldConfig() throws Exception { oldConfig = JSON.parseObject(zk.getData(CONFIG_PATH, true, new Stat()), ConcurrentMap.class); log.info("oldConfig is {}", oldConfig); } /** * 创建path设置初始值 * * @param watcher */ private static void createPathAndInitData(ZkClientWatcher watcher) { Map<String, String> maps = Maps.newConcurrentMap(); maps.put("spring.data.status.start", "true"); maps.put("switch", "on"); maps.put("startTime", "2019-10-24 12:00:00"); maps.put("coder", "1024"); watcher.createPath(CONFIG_PATH, JSON.toJSONString(maps)); } }
上述就是小编为大家分享的zk中怎么通过监听读取配置信息了,如果刚好有类似的疑惑,不妨参照上述分析进行理解。如果想知道更多相关知识,欢迎关注亿速云行业资讯频道。
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