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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。
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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 oldConfig = Maps.newConcurrentMap();
private static ConcurrentMap 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 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，欢迎关注创新互联行业资讯频道。