org.neo4j.kernel.ha.zookeeper
Class AbstractZooKeeperManager

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

Direct Known Subclasses:

ZooClient, ZooKeeperClusterClient

public abstract class AbstractZooKeeperManager
extends Object

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

Field Summary

protected Pair<Master,Machine>	cachedMaster
protected int	clientLockReadTimeout
protected int	clientReadTimeout
protected static String	HA_SERVERS_CHILD
protected int	maxConcurrentChannelsPerSlave
protected org.neo4j.kernel.impl.util.StringLogger	msgLog
protected static Master	NO_MASTER
static Pair<Master,Machine>	NO_MASTER_MACHINE_PAIR

Constructor Summary

AbstractZooKeeperManager(String servers, org.neo4j.com.StoreIdGetter storeIdGetter, org.neo4j.kernel.impl.util.StringLogger msgLog, int clientReadTimeout, int clientLockReadTimeout, int maxConcurrentChannelsPerSlave, int sessionTimeout)

Method Summary

protected String	asRootPath(org.neo4j.kernel.impl.nioneo.store.StoreId storeId)
protected Map<Integer,ZooKeeperMachine>	getAllMachines(boolean wait)
Pair<Master,Machine>	getCachedMaster()
protected org.neo4j.kernel.impl.nioneo.store.StoreId	getClusterStoreId(org.apache.zookeeper.ZooKeeper keeper, String clusterName)
protected String	getHaServer(int machineId, boolean wait)
protected ZooKeeperMachine	getMasterBasedOn(Collection<ZooKeeperMachine> machines)
protected Master	getMasterClientToMachine(Machine master)
protected 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()
protected int	getSessionTimeout()
abstract org.apache.zookeeper.ZooKeeper	getZooKeeper(boolean sync)
protected void	invalidateMaster()
protected Pair<Integer,Integer>	parseChild(String child)
protected Pair<Long,Integer>	readDataRepresentingInstance(String path)
protected 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

Field Detail

HA_SERVERS_CHILD

protected static final String HA_SERVERS_CHILD

See Also:

Constant Field Values

cachedMaster

protected volatile Pair<Master,Machine> cachedMaster

msgLog

protected final org.neo4j.kernel.impl.util.StringLogger msgLog

maxConcurrentChannelsPerSlave

protected final int maxConcurrentChannelsPerSlave

clientReadTimeout

protected final int clientReadTimeout

clientLockReadTimeout

protected final int clientLockReadTimeout

NO_MASTER

protected static final Master NO_MASTER

NO_MASTER_MACHINE_PAIR

public static final Pair<Master,Machine> NO_MASTER_MACHINE_PAIR

Constructor Detail

AbstractZooKeeperManager

public AbstractZooKeeperManager(String servers,
                                org.neo4j.com.StoreIdGetter storeIdGetter,
                                org.neo4j.kernel.impl.util.StringLogger msgLog,
                                int clientReadTimeout,
                                int clientLockReadTimeout,
                                int maxConcurrentChannelsPerSlave,
                                int sessionTimeout)

Method Detail

asRootPath

protected String asRootPath(org.neo4j.kernel.impl.nioneo.store.StoreId storeId)

getClusterStoreId

protected org.neo4j.kernel.impl.nioneo.store.StoreId getClusterStoreId(org.apache.zookeeper.ZooKeeper keeper,
                                                                       String clusterName)

getSessionTimeout

protected int getSessionTimeout()

getZooKeeper

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

getRoot

public abstract String getRoot()

parseChild

protected Pair<Integer,Integer> parseChild(String child)

readDataRepresentingInstance

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

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

invalidateMaster

protected void invalidateMaster()

getMasterFromZooKeeper

protected 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 Pair<Master,Machine> getCachedMaster()

getMasterBasedOn

protected ZooKeeperMachine getMasterBasedOn(Collection<ZooKeeperMachine> machines)

getAllMachines

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

getHaServer

protected String getHaServer(int machineId,
                             boolean wait)

readHaServer

protected Pair<String,Integer> readHaServer(int machineId,
                                            boolean wait)

shutdown

public void shutdown()

waitForSyncConnected

public abstract void waitForSyncConnected()

getServers

public String getServers()