老王讲自制RPC框架.(三.ZOOKEEPER)
(#)定义
Zookeeper 分布式服务框架是 Apache Hadoop 的一个子项目,它主要是用来解决分布式应用中经常遇到的一些数据管理问题,如:统一命名服务、状态同步服务、集群
管理、分布式应用配置项的管理
(#)使用
配置zk客户端我就不多说了,这个网上一找一堆,我主要说一下就是,自己玩玩的话,没必要搭建一个集群,用一台基本问题不大,在此假设集群已经搭建完成了
需要引入zk client的jar包
(#)code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | private Logger logger = LoggerFactory.getLogger(ServiceRepository. class ); @Value ( "${session.timeout}" ) private int SESSION_TIMEOUT; @Value ( "${registry.address}" ) private String CONNECT_STRING; @Value ( "${repository.path}" ) private String RPC_PATH; private ZooKeeper zooKeeper = null ; private CountDownLatch latch = new CountDownLatch( 1 ); private void createConnect() { releaseConnection(); try { zooKeeper = new ZooKeeper(CONNECT_STRING, SESSION_TIMEOUT, new Watcher() { public void process(WatchedEvent event) { logger.info( "receive message :{}" + event.getState()); latch.countDown(); } }); latch.await(); } catch (IOException e) { logger.error( "create异常信息:{}" , e); } catch (InterruptedException e) { logger.error( "create异常信息:{}" , e); } ; } private void releaseConnection() { if (zooKeeper != null ) { try { zooKeeper.close(); } catch (InterruptedException e) { logger.error( "release异常信息:{}" , e); } } } private boolean createPath(String path, String data) { try { zooKeeper.create(path, data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } catch (KeeperException e) { logger.error( "create异常信息:{}" , e); } catch (InterruptedException e) { logger.error( "create异常信息:{}" , e); } return true ; } public String readData(String path) { try { return new String(zooKeeper.getData(path, false , null )); } catch (KeeperException e) { logger.error( "read异常信息:{}" , e); return "" ; } catch (InterruptedException e) { logger.error( "read异常信息:{}" , e); return "" ; } } public boolean writeData(String path, String data) { try { zooKeeper.setData(path, data.getBytes(), - 1 ); } catch (KeeperException e) { logger.error( "write异常信息:{}" , e); } catch (InterruptedException e) { logger.error( "write异常信息:{}" , e); } return false ; } public void deleteNode(String path) { try { zooKeeper.delete(path, - 1 ); } catch (KeeperException e) { logger.error( "delete异常信息:{}" , e); } catch (InterruptedException e) { logger.error( "delete异常信息:{}" , e); } } } |
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