org.neo4j.kernel.ha.zookeeper
Class AbstractZooKeeperManager

java.lang.Object
  org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager

All Implemented Interfaces:

org.apache.zookeeper.Watcher

Direct Known Subclasses:

ZooClient, ZooKeeperClusterClient

public abstract class AbstractZooKeeperManager
extends Object
implements org.apache.zookeeper.Watcher

Contains basic functionality for a ZooKeeper manager, f.ex. how to get the current master in the cluster.

Nested Class Summary

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

org.apache.zookeeper.Watcher.Event

Field Summary

protected static String	HA_SERVERS_CHILD
static org.neo4j.helpers.Pair<Master,Machine>	NO_MASTER_MACHINE_PAIR
protected static int	SESSION_TIME_OUT

Constructor Summary

AbstractZooKeeperManager(String servers, org.neo4j.kernel.AbstractGraphDatabase graphDb, int clientReadTimeout, int clientLockReadTimeout, int maxConcurrentChannelsPerSlave)

Method Summary

protected Map<Integer,ZooKeeperMachine>	getAllMachines(boolean wait)
org.neo4j.helpers.Pair<Master,Machine>	getCachedMaster()
protected Client.ConnectionLostHandler	getConnectionLostHandler()
protected org.neo4j.kernel.AbstractGraphDatabase	getGraphDb()
protected String	getHaServer(int machineId, boolean wait)
protected ZooKeeperMachine	getMasterBasedOn(Collection<ZooKeeperMachine> machines)
protected Master	getMasterClientToMachine(Machine master)
protected org.neo4j.helpers.Pair<Master,Machine>	getMasterFromZooKeeper(boolean wait, boolean allowChange) Tries to discover the master from the zookeeper information.
protected abstract int	getMyMachineId()
abstract String	getRoot()
String	getServers()
abstract org.apache.zookeeper.ZooKeeper	getZooKeeper(boolean sync)
protected org.apache.zookeeper.ZooKeeper	instantiateZooKeeper()
protected void	invalidateMaster()
protected org.neo4j.helpers.Pair<Integer,Integer>	parseChild(String child)
protected org.neo4j.helpers.Pair<Long,Integer>	readDataRepresentingInstance(String path)
protected org.neo4j.helpers.Pair<String,Integer>	readHaServer(int machineId, boolean wait)
void	shutdown()
abstract void	waitForSyncConnected()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.zookeeper.Watcher

process

Field Detail

HA_SERVERS_CHILD

protected static final String HA_SERVERS_CHILD

See Also:

Constant Field Values

SESSION_TIME_OUT

protected static final int SESSION_TIME_OUT

See Also:

Constant Field Values

NO_MASTER_MACHINE_PAIR

public static final org.neo4j.helpers.Pair<Master,Machine> NO_MASTER_MACHINE_PAIR

Constructor Detail

AbstractZooKeeperManager

public AbstractZooKeeperManager(String servers,
                                org.neo4j.kernel.AbstractGraphDatabase graphDb,
                                int clientReadTimeout,
                                int clientLockReadTimeout,
                                int maxConcurrentChannelsPerSlave)

Method Detail

instantiateZooKeeper

protected org.apache.zookeeper.ZooKeeper instantiateZooKeeper()

getZooKeeper

public abstract org.apache.zookeeper.ZooKeeper getZooKeeper(boolean sync)

getRoot

public abstract String getRoot()

getGraphDb

protected org.neo4j.kernel.AbstractGraphDatabase getGraphDb()

parseChild

protected org.neo4j.helpers.Pair<Integer,Integer> parseChild(String child)

readDataRepresentingInstance

protected org.neo4j.helpers.Pair<Long,Integer> readDataRepresentingInstance(String path)
                                                                     throws InterruptedException,
                                                                            org.apache.zookeeper.KeeperException

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

invalidateMaster

protected void invalidateMaster()

getMasterFromZooKeeper

protected org.neo4j.helpers.Pair<Master,Machine> getMasterFromZooKeeper(boolean wait,
                                                                        boolean allowChange)

Tries to discover the master from the zookeeper information. Will return a Pair of a Master and the Machine it resides on. If the new master is different than the current then the current is invalidated and if allowChange is set to true then the a connection to the new master is established otherwise a NO_MASTER is returned.

Parameters:

wait - Whether to wait for a sync connected event

allowChange - If to connect to the new master

Returns:

The master machine pair, possibly a NO_MASTER_MACHINE_PAIR

getMasterClientToMachine

protected Master getMasterClientToMachine(Machine master)

getMyMachineId

protected abstract int getMyMachineId()

getCachedMaster

public org.neo4j.helpers.Pair<Master,Machine> getCachedMaster()

getMasterBasedOn

protected ZooKeeperMachine getMasterBasedOn(Collection<ZooKeeperMachine> machines)

getConnectionLostHandler

protected Client.ConnectionLostHandler getConnectionLostHandler()

getAllMachines

protected Map<Integer,ZooKeeperMachine> getAllMachines(boolean wait)

getHaServer

protected String getHaServer(int machineId,
                             boolean wait)

readHaServer

protected org.neo4j.helpers.Pair<String,Integer> readHaServer(int machineId,
                                                              boolean wait)

shutdown

public void shutdown()

waitForSyncConnected

public abstract void waitForSyncConnected()

getServers

public String getServers()