Package com.mapr.fs

Class ServiceWatcher

java.lang.Object

com.mapr.fs.ServiceWatcher

All Implemented Interfaces:

AutoCloseable, org.apache.zookeeper.Watcher

Direct Known Subclasses:

QueryServiceWatcher

public class ServiceWatcher
extends Object
implements org.apache.zookeeper.Watcher, AutoCloseable

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	ServiceWatcher.ZkNode

Nested classes/interfaces inherited from interface org.apache.zookeeper.Watcher

org.apache.zookeeper.Watcher.Event, org.apache.zookeeper.Watcher.WatcherType

Constructor Summary

Constructors

Constructor	Description
ServiceWatcher(String zkConnectString, String clusterName)

Method Summary

Modifier and Type	Method	Description
protected int	bytesToInt(byte[] data)
void	close()
boolean	connect()
protected String	create(String path, byte[] data, List<org.apache.zookeeper.data.ACL> acl, org.apache.zookeeper.CreateMode createMode)
protected Void	delete(String path)
protected Boolean	exist(String nodePath)
protected List<String>	getChildren(String nodePath)
protected byte[]	getData(String nodePath)	Retrieve the data stored in the specified ZooKeeper node specified by `primaryPath`.
String	getZKString()
protected Integer	increment(String nodePath)
protected byte[]	intToBytes(int newValue)
boolean	isConnected()
void	process(org.apache.zookeeper.WatchedEvent event)
boolean	reconnect()
protected org.apache.zookeeper.data.Stat	setData(ServiceWatcher.ZkNode zkNode)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ServiceWatcher

public ServiceWatcher(String zkConnectString,
 String clusterName)

Method Details

getZKString

public String getZKString()

isConnected

public boolean isConnected()

connect

public boolean connect()

reconnect

public boolean reconnect()

close

public void close()

Specified by:

close in interface AutoCloseable

process

public void process(org.apache.zookeeper.WatchedEvent event)

Specified by:

process in interface org.apache.zookeeper.Watcher

getData

protected byte[] getData(String nodePath)
                  throws InterruptedException,
org.apache.zookeeper.KeeperException,
RetryException,
FileNotFoundException,
IOException

Retrieve the data stored in the specified ZooKeeper node specified by `primaryPath`. If the `primaryPath` does not exist, try the other paths if provided, in the order they are provided

Parameters:

primaryPath - The primary ZooKeeper node path from which to read data from

nodePaths - Array of alternate paths to try

Returns:

binary data stored in the ZooKeeper node.

Throws:

RetryException - if a retry-able exception occurs

FileNotFoundException - if none of the specified nodes exist

IOException - if a non-retry-able exception occurs

InterruptedException

org.apache.zookeeper.KeeperException.ConnectionLossException

org.apache.zookeeper.KeeperException.SessionExpiredException

org.apache.zookeeper.KeeperException.SessionMovedException

org.apache.zookeeper.KeeperException

setData

protected org.apache.zookeeper.data.Stat setData(ServiceWatcher.ZkNode zkNode)
                                          throws InterruptedException,
org.apache.zookeeper.KeeperException,
RetryException,
FileNotFoundException,
IOException

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

RetryException

FileNotFoundException

IOException

increment

protected Integer increment(String nodePath)
                     throws IllegalFormatException,
InterruptedException,
org.apache.zookeeper.KeeperException,
IOException

Throws:

IllegalFormatException

InterruptedException

org.apache.zookeeper.KeeperException

IOException

bytesToInt

protected int bytesToInt(byte[] data)
                  throws NullPointerException,
IllegalFormatException

Throws:

NullPointerException

IllegalFormatException

intToBytes

protected byte[] intToBytes(int newValue)

exist

protected Boolean exist(String nodePath)
                 throws InterruptedException,
org.apache.zookeeper.KeeperException,
RetryException,
FileNotFoundException,
IOException

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

RetryException

FileNotFoundException

IOException

delete

protected Void delete(String path)
               throws InterruptedException,
org.apache.zookeeper.KeeperException,
RetryException,
FileNotFoundException,
IOException

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

RetryException

FileNotFoundException

IOException

create

protected String create(String path,
 byte[] data,
 List<org.apache.zookeeper.data.ACL> acl,
 org.apache.zookeeper.CreateMode createMode)
                 throws InterruptedException,
org.apache.zookeeper.KeeperException,
RetryException,
FileNotFoundException,
IOException

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

RetryException

FileNotFoundException

IOException

getChildren

protected List<String> getChildren(String nodePath)
                            throws RetryException,
FileNotFoundException,
IOException,
InterruptedException,
org.apache.zookeeper.KeeperException

Throws:

RetryException

FileNotFoundException

IOException

InterruptedException

org.apache.zookeeper.KeeperException