Examples with Watcher org.apache.zookeeper.Watcher used on opensource projects

Example 66 with Watcher

use of org.apache.zookeeper.Watcher in project disgear by yangbutao.

the class ClusterStateCacheManager method createClusterStateWatcher.

/**
	 * monitor to clusterstate.json
	 */
public void createClusterStateWatcher() throws Exception {
    byte[] datas = zkClient.getData(CLUSTER_STATE, new Watcher() {

        public void process(WatchedEvent event) {
            if (EventType.None.equals(event.getType())) {
                return;
            }
            try {
                synchronized (this) {
                    final Watcher thisWatch = this;
                    Stat stat = new Stat();
                    byte[] data = zkClient.getData(CLUSTER_STATE, thisWatch, stat);
                    List<String> liveNodes = zkClient.getChildren(LIVE_NODES_ZKNODE, this);
                    Set<String> liveNodesSet = new HashSet<String>();
                    liveNodesSet.addAll(liveNodes);
                    Set<String> ln = clusterState.getLiveNodes();
                    ClusterState newClusterState = ClusterState.load(stat.getVersion(), data, liveNodesSet);
                    clusterState = newClusterState;
                    CacheOperation.INSTANCE.clearJRedisPool();
                    System.out.println("CLUSTER_STATE changed");
                    System.out.println(clusterState.toString());
                }
            } catch (KeeperException e) {
                if (e.code() == KeeperException.Code.SESSIONEXPIRED || e.code() == KeeperException.Code.CONNECTIONLOSS) {
                    return;
                }
                // log.error("", e);
                throw new RuntimeException(e);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                return;
            }
        }
    }, null);
    Stat stat = new Stat();
    List<String> liveNodes = zkClient.getChildren(LIVE_NODES_ZKNODE, null);
    Set<String> liveNodesSet = new HashSet<String>();
    liveNodesSet.addAll(liveNodes);
    clusterState = ClusterState.load(stat.getVersion(), datas, liveNodesSet);
}

Example 67 with Watcher

use of org.apache.zookeeper.Watcher in project yyl_example by Relucent.

the class Test2 method main.

public static void main(String[] args) {
    ZooKeeper zk = null;
    try {
        zk = new ZooKeeper("localhost:2181", 1000, new Watcher() {

            // 监控所有被触发的事件
            public void process(WatchedEvent event) {
                System.out.println("已经触发了" + event.getType() + "事件！");
            }
        });
        printChildren("/", zk);
    } catch (Exception e) {
        e.printStackTrace();
        try {
            if (zk != null) {
                zk.close();
            }
        } catch (Exception e1) {
        }
    }
}

Example 68 with Watcher

use of org.apache.zookeeper.Watcher in project lucene-solr by apache.

the class ZkIndexSchemaReader method createSchemaWatcher.

public void createSchemaWatcher() {
    log.info("Creating ZooKeeper watch for the managed schema at " + managedSchemaPath);
    try {
        zkClient.exists(managedSchemaPath, new Watcher() {

            @Override
            public void process(WatchedEvent event) {
                if (ZkIndexSchemaReader.this.isRemoved) {
                    // the core for this reader has already been removed, don't process this event
                    return;
                }
                // session events are not change events, and do not remove the watcher
                if (Event.EventType.None.equals(event.getType())) {
                    return;
                }
                log.info("A schema change: {}, has occurred - updating schema from ZooKeeper ...", event);
                try {
                    updateSchema(this, -1);
                } catch (KeeperException e) {
                    if (e.code() == KeeperException.Code.SESSIONEXPIRED || e.code() == KeeperException.Code.CONNECTIONLOSS) {
                        log.warn("ZooKeeper watch triggered, but Solr cannot talk to ZK");
                        return;
                    }
                    log.error("", e);
                    throw new ZooKeeperException(ErrorCode.SERVER_ERROR, "", e);
                } catch (InterruptedException e) {
                    // Restore the interrupted status
                    Thread.currentThread().interrupt();
                    log.warn("", e);
                }
            }
        }, true);
    } catch (KeeperException e) {
        final String msg = "Error creating ZooKeeper watch for the managed schema";
        log.error(msg, e);
        throw new ZooKeeperException(ErrorCode.SERVER_ERROR, msg, e);
    } catch (InterruptedException e) {
        // Restore the interrupted status
        Thread.currentThread().interrupt();
        log.warn("", e);
    }
}

Example 69 with Watcher

use of org.apache.zookeeper.Watcher in project lucene-solr by apache.

the class ZkSolrClientTest method testMultipleWatchesAsync.

public void testMultipleWatchesAsync() throws Exception {
    try (ZkConnection conn = new ZkConnection()) {
        final SolrZkClient zkClient = conn.getClient();
        zkClient.makePath("/collections", true);
        final int numColls = random().nextInt(100);
        final CountDownLatch latch = new CountDownLatch(numColls);
        for (int i = 1; i <= numColls; i++) {
            String collPath = "/collections/collection" + i;
            zkClient.makePath(collPath, true);
            zkClient.getChildren(collPath, new Watcher() {

                @Override
                public void process(WatchedEvent event) {
                    latch.countDown();
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                    }
                }
            }, true);
        }
        for (int i = 1; i <= numColls; i++) {
            String shardsPath = "/collections/collection" + i + "/shards";
            zkClient.makePath(shardsPath, true);
        }
        assertTrue(latch.await(1000, TimeUnit.MILLISECONDS));
    }
}

Example 70 with Watcher

use of org.apache.zookeeper.Watcher in project XRTB by benmfaul.

the class ZTester method connect.

// host should be 127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002
public ZooKeeper connect(String host) throws Exception {
    zk = new ZooKeeper(host, 2101, new Watcher() {

        public void process(WatchedEvent event) {
            if (event.getState() == KeeperState.SyncConnected) {
                connSignal.countDown();
            }
        }
    });
    connSignal.await();
    return zk;
}