org.lable.oss.uniqueid.zookeeper.connection

Enum ZooKeeperConnection

java.lang.Object

java.lang.Enum<ZooKeeperConnection>

org.lable.oss.uniqueid.zookeeper.connection.ZooKeeperConnection

All Implemented Interfaces:

Serializable, Comparable<ZooKeeperConnection>

public enum ZooKeeperConnection
extends Enum<ZooKeeperConnection>

Singleton for a ZooKeeper connection object instance.

Enum Constant Summary

Enum Constants

Enum Constant and Description
INSTANCE

Method Summary

Modifier and Type	Method and Description
static void	configure(String quorumAddresses) Configure the ZooKeeper quorum addresses.
static void	deregisterObserver(ZooKeeperConnectionObserver observer)
static org.apache.zookeeper.ZooKeeper	get() Get the ZooKeeper connection object.
static void	registerObserver(ZooKeeperConnectionObserver observer)
static void	reset() Remove any preexisting ZooKeeper connection instance.
static ZooKeeperConnection	valueOf(String name) Returns the enum constant of this type with the specified name.
static ZooKeeperConnection[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

INSTANCE

public static final ZooKeeperConnection INSTANCE

Method Detail

values

public static ZooKeeperConnection[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ZooKeeperConnection c : ZooKeeperConnection.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ZooKeeperConnection valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

get

public static org.apache.zookeeper.ZooKeeper get()
                                          throws IOException

Get the ZooKeeper connection object. If none exists, connect to the quorum and return the new object.

Returns:

The ZooKeeper object.

Throws:

IOException - Thrown when connecting to the ZooKeeper quorum fails.

registerObserver

public static void registerObserver(ZooKeeperConnectionObserver observer)

deregisterObserver

public static void deregisterObserver(ZooKeeperConnectionObserver observer)

reset

public static void reset()

Remove any preexisting ZooKeeper connection instance.

This method should be called when the connection to the ZooKeeper is expired, so a subsequent call to get() will establish a new connection.

configure

public static void configure(String quorumAddresses)

Configure the ZooKeeper quorum addresses.

Parameters:

quorumAddresses - The server address string expected by ZooKeeper.