org.eclipse.smila.zookeeper

Interface ZooKeeperService

All Known Implementing Classes:

ZooKeeperServiceImpl

public interface ZooKeeperService

Interface of ZooKeeper management service.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	BUNDLE_ID name of bundle.

Method Summary

Methods

Modifier and Type	Method and Description
void	closeClient() close the client quietly.
ZooKeeper	getClient() get zookeeper client, create if it doesn't exist.
long	getFailSafetyLevel()
AnyMap	getServerState()
boolean	isOperational()
void	registerWatcher(Watcher watcher) register a watcher for ZooKeeper events.
void	unregisterWatcher(Watcher watcher) unregister a watcher for ZooKeeper events.
void	waitForClientConnected() wait until the zookeeper client is (re)connected.

Field Detail

BUNDLE_ID

static final java.lang.String BUNDLE_ID

name of bundle.

See Also:

Constant Field Values

Method Detail

getClient

ZooKeeper getClient()
                    throws java.io.IOException,
                           ClusterConfigException

get zookeeper client, create if it doesn't exist.

Returns:

client

Throws:

java.io.IOException - error creating client

ClusterConfigException - if the cluster configuration cannot be read

closeClient

void closeClient()

close the client quietly.

getFailSafetyLevel

long getFailSafetyLevel()

Returns:

number of nodes that may fail without ZooKeeper service stopping to work.

getServerState

AnyMap getServerState()

Returns:

zookeeper server/cluster state for monitoring.

isOperational

boolean isOperational()

Returns:

'true' if zookeeper (cluster) is in a state to answer requests, 'false' otherwise.

waitForClientConnected

void waitForClientConnected()

wait until the zookeeper client is (re)connected.

registerWatcher

void registerWatcher(Watcher watcher)

register a watcher for ZooKeeper events.

unregisterWatcher

void unregisterWatcher(Watcher watcher)

unregister a watcher for ZooKeeper events.