Examples of org.lilyproject.util.zookeeper.StateWatchingZooKeeper$MyWatcher

org.lilyproject.util.zookeeper.StateWatchingZooKeeper
This implementation of {@link ZooKeeperItf} is meant for use as a global ZooKeeper handlewithin a ZK-dependent application.
It will:
- on startup (= constructor) wait for the ZK connection to come up, if it does not come up within the session timeout an exception will be thrown. This avoids the remainder of the application starting up in the absence of a valid ZK connection.
- when the session expires or the ZK connection is lost for longer than the session timeout, it will shut down the application.
So this is a good solution for applications which can not function in absence of ZooKeeper.

        HBASE_PROXY = new HBaseProxy();
        HBASE_PROXY.start();


        IdGenerator idGenerator = new IdGeneratorImpl();
        configuration = HBASE_PROXY.getConf();
        zooKeeper = new StateWatchingZooKeeper(HBASE_PROXY.getZkConnectString(), 10000);
        hbaseTableFactory = new HBaseTableFactoryImpl(HBASE_PROXY.getConf());


        RepositoryModel repositoryModel = new RepositoryModelImpl(zooKeeper);


        typeManager = new HBaseTypeManager(idGenerator, configuration, zooKeeper, hbaseTableFactory);

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        int result = super.run(cmd);
        if (result != 0) {
            return result;
        }


        zk = new StateWatchingZooKeeper(zkConnectionString, zkSessionTimeout);


        boolean lilyNodeExists = zk.retryOperation(new ZooKeeperOperation<Boolean>() {
            @Override
            public Boolean execute() throws KeeperException, InterruptedException {
                return zk.exists("/lily", false) != null;

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        int result = super.run(cmd);
        if (result != 0) {
            return result;
        }


        zk = new StateWatchingZooKeeper(zkConnectionString, zkSessionTimeout);


        if (!assertLilyNotRunning()) {
            return 1;
        }

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        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", zkConnectionString);
        HTableInterface table = new HTable(conf, tableName);


        // Type manager
        zk = new StateWatchingZooKeeper(zkConnectionString, zkSessionTimeout);
        typeMgr = new HBaseTypeManager(idGenerator, conf, zk, new HBaseTableFactoryImpl(conf));


        Get get = new Get(recordId.toBytes());
        get.setMaxVersions();
        Result row = table.get(get);

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        return hbaseConf;
    }


    protected ZooKeeperItf getZooKeeper() throws IOException {
        if (zk == null) {
            zk = new StateWatchingZooKeeper(zkConnectionString, zkSessionTimeout);
        }
        return zk;
    }

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