Java CuratorFramework類代碼示例

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
public void notifyClusterDDL(String schema, String table, String sql, DDLInfo.DDLStatus ddlStatus, boolean needNotifyOther) throws Exception {
    CuratorFramework zkConn = ZKUtils.getConnection();
    DDLInfo ddlInfo = new DDLInfo(schema, sql, ZkConfig.getInstance().getValue(ZkParamCfg.ZK_CFG_MYID), ddlStatus);
    String nodeName = StringUtil.getFullName(schema, table);
    String nodePath = ZKPaths.makePath(KVPathUtil.getDDLPath(), nodeName);
    if (zkConn.checkExists().forPath(nodePath) == null) {
        zkConn.create().forPath(nodePath, ddlInfo.toString().getBytes(StandardCharsets.UTF_8));
    } else {
        String instancePath = ZKPaths.makePath(nodePath, KVPathUtil.DDL_INSTANCE);
        String thisNode = ZkConfig.getInstance().getValue(ZkParamCfg.ZK_CFG_MYID);
        ZKUtils.createTempNode(instancePath, thisNode);
        if (needNotifyOther) {
            //this node is ddl sender
            zkConn.setData().forPath(nodePath, ddlInfo.toString().getBytes(StandardCharsets.UTF_8));
            while (true) {
                List<String> preparedList = zkConn.getChildren().forPath(instancePath);
                List<String> onlineList = zkConn.getChildren().forPath(KVPathUtil.getOnlinePath());
                if (preparedList.size() >= onlineList.size()) {
                    zkConn.delete().deletingChildrenIfNeeded().forPath(nodePath);
                    break;
                }
                LockSupport.parkNanos(TimeUnit.MILLISECONDS.toNanos(100));
            }
        }
    }
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
@Override
public CuratorFramework get() {
    String quorum = zookeeperConfig.getQuorum();
    String serviceDiscoveryPath = zookeeperConfig.getServiceDiscoveryPath();
    String connectionString = quorum + (serviceDiscoveryPath == null ? "" : serviceDiscoveryPath);

    RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);

    LOGGER.info("Initiating Curator connection to Zookeeper using: [{}]", connectionString);
    // Use chroot so all subsequent paths are below /stroom-services to avoid conflicts with hbase/zookeeper/kafka etc.
    CuratorFramework client = CuratorFrameworkFactory.newClient(connectionString, retryPolicy);
    client.start();

    try {
        //Ensure the chrooted path for stroom-services exists
        Stat stat = client.checkExists().forPath("/");
        if (stat == null) {
            LOGGER.info("Creating chroot-ed root node inside " + serviceDiscoveryPath);
            client.create().forPath("/");
        }
    } catch (Exception e) {
        throw new RuntimeException("Error connecting to zookeeper using connection String: " + connectionString, e);
    }
    return client;
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
private static CuratorFramework createConnection() {
    String url = ZkConfig.getInstance().getZkURL();
    CuratorFramework framework = CuratorFrameworkFactory.newClient(url, new ExponentialBackoffRetry(100, 6));
    // start connection
    framework.start();
    // wait 3 second to establish connect
    try {
        framework.blockUntilConnected(3, TimeUnit.SECONDS);
        if (framework.getZookeeperClient().isConnected()) {
            LOGGER.info("CuratorFramework createConnection success");
            return framework;
        }
    } catch (InterruptedException ignored) {
        LOGGER.info("CuratorFramework createConnection error", ignored);
        Thread.currentThread().interrupt();
    }
    // fail situation
    framework.close();
    throw new RuntimeException("failed to connect to zookeeper service : " + url);
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
private static CuratorFramework createConnection() {
       String url= ZkConfig.getInstance().getZkURL();

    CuratorFramework curatorFramework = CuratorFrameworkFactory.newClient(url, new ExponentialBackoffRetry(100, 6));

    // start connection
    curatorFramework.start();
    // wait 3 second to establish connect
    try {
        curatorFramework.blockUntilConnected(3, TimeUnit.SECONDS);
        if (curatorFramework.getZookeeperClient().isConnected()) {
            return curatorFramework;
        }
    } catch (InterruptedException ignored) {
        Thread.currentThread().interrupt();
    }

    // fail situation
    curatorFramework.close();
    throw new RuntimeException("failed to connect to zookeeper service : " + url);
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
private ZooMap(Builder builder) {
    this.connectionString = builder.connectionString;
    ConnectStringParser connectStringParser = new ConnectStringParser(connectionString);
    if(connectStringParser.getChrootPath() != null) {
        final String connectionStringForChrootCreation = connectStringParser.getServerAddresses().stream().map(InetSocketAddress::toString).collect(Collectors.joining(","));
        try(final CuratorFramework clientForChrootCreation = newCuratorFrameworkClient(builder, connectionStringForChrootCreation)) {
            startAndBlock(clientForChrootCreation);
            tryIt(() -> clientForChrootCreation.createContainers(connectStringParser.getChrootPath()));
        }
    }
    client = newCuratorFrameworkClient(builder, connectionString);
    this.root = builder.root;
    startAndBlock(client);
    if(!root.isEmpty()) {
        tryIt(() -> client.createContainers(root));
    }
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
@Before
public void setUp() throws Exception {
    Configurator
        .initialize("FastMQ", Thread.currentThread().getContextClassLoader(), "log4j2.xml");
    Log log = new Log();
    LogSegment logSegment = new LogSegment();
    logSegment.setLedgerId(ledgerId);
    logSegment.setTimestamp(System.currentTimeMillis());
    log.setSegments(Collections.singletonList(logSegment));
    when(logInfoStorage.getLogInfo(any())).thenReturn(log);

    CuratorFramework curatorFramework = CuratorFrameworkFactory
        .newClient("127.0.0.1:2181", new ExponentialBackoffRetry(1000, 3));
    curatorFramework.start();
    asyncCuratorFramework = AsyncCuratorFramework.wrap(curatorFramework);
    offsetStorage = new ZkOffsetStorageImpl(logInfoStorage, asyncCuratorFramework);
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
public ZkAbstractStore(CuratorFramework framework, PStoreConfig<V> config)
    throws IOException {
  this.parent = "/" + config.getName();
  this.prefix = parent + "/";
  this.framework = framework;
  this.config = config;

  // make sure the parent node exists.
  try {
    if (framework.checkExists().forPath(parent) == null) {
      framework.create().withMode(CreateMode.PERSISTENT).forPath(parent);
    }

    this.childrenCache = new PathChildrenCache(framework, parent, true);
    this.childrenCache.start(StartMode.BUILD_INITIAL_CACHE);

  } catch (Exception e) {
    throw new RuntimeException("Failure while accessing Zookeeper for PStore: " + e.getMessage(), e);
  }

}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
public ZkRangeStore getZkRangeStore(int clientIndex) {
	String lockPath = "/snowflake/locks";
	String storePath = "/snowflake/idstore";
	CuratorFramework curatorFramework = ZkUtils.create("127.0.0.1:2181", 1000, 10000);
	curatorFramework.start();
	for (String client : clients) {
		try {
			curatorFramework.setData().forPath(ZKPaths.makePath(storePath, client), "0".getBytes());
		} catch (Exception e) {
			if (e instanceof KeeperException.NoNodeException) {
				try {
					curatorFramework.create().creatingParentsIfNeeded().forPath(storePath, "0".getBytes());
				} catch (Exception e1) {
					e1.printStackTrace();
				}
			}
		}
	}
	return new ZkRangeStore(clients.get(clientIndex), curatorFramework, lockPath, storePath, 1, TimeUnit.SECONDS, 0, 10);
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
@Override
protected FlumeConfiguration getFlumeConfiguration() {
  try {
    CuratorFramework cf = createClient();
    cf.start();
    try {
      byte[] data = cf.getData().forPath(basePath + "/" + getAgentName());
      return configFromBytes(data);
    } finally {
      cf.close();
    }
  } catch (Exception e) {
    LOGGER.error("Error getting configuration info from Zookeeper", e);
    throw new FlumeException(e);
  }
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
/**
 * Create a File-based repository service
 * @param partitionData the partition data configuration
 * @param partitionUrls the partition URL configuration
 * @param curator the curator framework
 * @param producer the kafka producer
 * @param notifications the notification service
 * @param idSupplier an identifier supplier for new resources
 * @param async generate cached resources asynchronously if true, synchonously if false
 * @throws IOException if the directory is not writable
 */
public FileResourceService(final Map<String, String> partitionData, final Map<String, String> partitionUrls,
        final CuratorFramework curator, final Producer<String, String> producer, final EventService notifications,
        final Supplier<String> idSupplier, final Boolean async) throws IOException {
    super(partitionUrls, producer, curator, notifications, idSupplier, async);

    requireNonNull(partitionData, "partition data configuration may not be null!");

    RESERVED_PARTITION_NAMES.stream().filter(partitionData::containsKey).findAny().ifPresent(name -> {
        throw new IllegalArgumentException("Invalid partition name: " + name);
    });

    this.partitionData = partitionData;

    init();
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
@Bean
public CuratorFramework curatorFramework() {
    ZKConfig config = config();

    if (config.useZooKeeperWaitTimePolicy()) {
        return new RedirectorCuratorFramework(config);
    }

    CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory.builder()
            .connectString(config.getZooKeeperConnection())
            .connectionTimeoutMs(config.getZooKeeperConnectionTimeout())
            .sessionTimeoutMs(config.getZooKeeperSessionTimeout())
            .retryPolicy(new RetryNTimes(config.getZooKeeperRetryAttempts(), config.getZooKeeperRetryInterval()))
            .compressionProvider(new GzipCompressionProvider());

    return builder.build();
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
@Bean(name = "curator-framework")
public CuratorFramework curatorFramework() {
	return CuratorFrameworkFactory
			.builder()
			.connectString(
					env.getProperty("rpc.server.zookeeper.connect.string"))
			.sessionTimeoutMs(
					Integer.parseInt(env.getProperty(
							"rpc.server.zookeeper.session.timeout.ms",
							"10000")))
			.connectionTimeoutMs(
					Integer.parseInt(env.getProperty(
							"rpc.server.zookeeper.connection.timeout.ms",
							"10000"))).retryPolicy(this.retryPolicy())
			.aclProvider(this.aclProvider()).authorization(this.authInfo())
			.build();
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
@Override
public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {
    ChildData childData = event.getData();
    switch (event.getType()) {
        case CHILD_ADDED:
            createOrUpdateViewMeta(childData, false);
            break;
        case CHILD_UPDATED:
            createOrUpdateViewMeta(childData, true);
            break;
        case CHILD_REMOVED:
            deleteNode(childData);
            break;
        default:
            break;
    }
}
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
/**
     * 設置子節點更改監聽
     *
     * @param path
     * @throws Exception
     */
    public boolean listenerPathChildrenCache(String path, BiConsumer<CuratorFramework, PathChildrenCacheEvent> biConsumer) {

        if (!ObjectUtils.allNotNull(zkClient, path, biConsumer)) {
            return Boolean.FALSE;
        }
        try {
            Stat stat = exists(path);
            if (stat != null) {
                PathChildrenCache watcher = new PathChildrenCache(zkClient, path, true);
                watcher.start(PathChildrenCache.StartMode.POST_INITIALIZED_EVENT);
                //該模式下 watcher在重連的時候會自動 rebuild 否則需要重新rebuild
                watcher.getListenable().addListener(biConsumer::accept, pool);
                if (!pathChildrenCaches.contains(watcher)) {
                    pathChildrenCaches.add(watcher);
                }
//                else{
//                    watcher.rebuild();
//                }
                return Boolean.TRUE;
            }
        } catch (Exception e) {
            log.error("listen path children cache fail! path:{} , error:{}", path, e);
        }
        return Boolean.FALSE;
    }
 

import org.apache.curator.framework.CuratorFramework; //導入依賴的package包/類
public RulesxmlTozkLoader(ZookeeperProcessListen zookeeperListen, CuratorFramework curator,
        XmlProcessBase xmlParseBase) {

    this.setCurator(curator);

    // 獲得當前集群的名稱
    String schemaPath = zookeeperListen.getBasePath();
    schemaPath = schemaPath + ZookeeperPath.ZK_SEPARATOR.getKey() + ZookeeperPath.FLOW_ZK_PATH_RULE.getKey();

    currZkPath = schemaPath;
    // 將當前自己注冊為事件接收對象
    zookeeperListen.addListen(schemaPath, this);

    // 生成xml與類的轉換信息
    parseRulesXMl = new RuleParseXmlImpl(xmlParseBase);
}