org.neo4j.kernel.ha.cluster.zoo
Class ZooClient

java.lang.Object
  org.neo4j.kernel.ha.cluster.zoo.ZooClient

All Implemented Interfaces:

CompatibilityMonitor, org.neo4j.kernel.lifecycle.Lifecycle

public class ZooClient
extends Object
implements org.neo4j.kernel.lifecycle.Lifecycle, CompatibilityMonitor

Field Summary

protected Machine	cachedMaster
protected static String	COMPATIBILITY_CHILD_18
protected static String	COMPATIBILITY_CHILD_19
protected static String	FLUSH_REQUESTED_CHILD
protected static String	HA_SERVERS_CHILD
protected org.neo4j.kernel.impl.util.StringLogger	msgLog
static Machine	NO_MACHINE
protected static int	STOP_FLUSHING

Constructor Summary

ZooClient(org.neo4j.kernel.impl.util.StringLogger stringLogger, org.neo4j.kernel.configuration.Config conf)

Method Summary

void	addCompatibilityModeListener(CompatibilityModeListener listener)
void	addZooListener(ZooListener zooListener)
protected String	asRootPath(org.neo4j.kernel.impl.nioneo.store.StoreId storeId)
protected Map<Integer,ZooKeeperMachine>	getAllMachines(boolean wait)
protected Map<Integer,ZooKeeperMachine>	getAllMachines(boolean wait, org.neo4j.kernel.ha.cluster.zoo.ZooClient.WaitMode mode)
protected Map<Integer,ZooKeeperMachine>	getAllMachinesInner(boolean wait, org.neo4j.kernel.ha.cluster.zoo.ZooClient.WaitMode mode)
Machine	getCachedMaster()
String	getClusterServer()
org.neo4j.kernel.impl.nioneo.store.StoreId	getClusterStoreId(org.neo4j.kernel.ha.cluster.zoo.ZooClient.WaitMode mode)
protected org.neo4j.kernel.impl.nioneo.store.StoreId	getClusterStoreId(org.apache.zookeeper.ZooKeeper keeper, String clusterName)
int	getCurrentMasterNotify()
String	getHaServer()
protected Machine	getHaServer(int machineId, boolean wait)
protected Iterable<Machine>	getHaServers()
protected ZooKeeperMachine	getMasterBasedOn(Collection<ZooKeeperMachine> machines)
protected int	getMyMachineId()
protected int	getNumberOfServers()
String	getRoot()
protected String	getSequenceNr()
protected int	getSessionTimeout()
protected org.neo4j.kernel.impl.nioneo.store.StoreId	getStoreId()
org.apache.zookeeper.ZooKeeper	getZooKeeper(boolean sync)
protected int	idFromPath(String path)
void	init()
protected void	invalidateMaster()
protected void	masterElectionHappened(Machine previousMaster, Machine newMaster)
protected org.neo4j.helpers.Pair<Integer,Integer>	parseChild(String child)
protected org.neo4j.helpers.Pair<Long,Integer>	readDataRepresentingInstance(String path)
protected Machine	readHaServer(int machineId, boolean wait)
protected void	refreshHaServers()
String	refreshMasterFromZooKeeper() Tries to discover the master from the zookeeper information.
void	removeCompatibilityModeListener(CompatibilityModeListener listener)
protected void	setDataChangeWatcher(String child, int currentMasterId)
protected void	setDataChangeWatcher(String child, int currentMasterId, boolean skipOnSame) Writes into one of master-notify or master-rebound the value given.
void	shutdown()
void	start()
void	stop()
protected void	subscribeToChildrenChangeWatcher(String child)
protected void	subscribeToDataChangeWatcher(String child)
String	toString()
void	waitForSyncConnected()

Methods inherited from class java.lang.Object

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

Field Detail

HA_SERVERS_CHILD

protected static final String HA_SERVERS_CHILD

See Also:

Constant Field Values

FLUSH_REQUESTED_CHILD

protected static final String FLUSH_REQUESTED_CHILD

See Also:

Constant Field Values

COMPATIBILITY_CHILD_18

protected static final String COMPATIBILITY_CHILD_18

See Also:

Constant Field Values

COMPATIBILITY_CHILD_19

protected static final String COMPATIBILITY_CHILD_19

See Also:

Constant Field Values

STOP_FLUSHING

protected static final int STOP_FLUSHING

See Also:

Constant Field Values

cachedMaster

protected volatile Machine cachedMaster

msgLog

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

NO_MACHINE

public static final Machine NO_MACHINE

Constructor Detail

ZooClient

public ZooClient(org.neo4j.kernel.impl.util.StringLogger stringLogger,
                 org.neo4j.kernel.configuration.Config conf)

Method Detail

init

public void init()
          throws Throwable

Specified by:

init in interface org.neo4j.kernel.lifecycle.Lifecycle

Throws:

Throwable

start

public void start()
           throws Throwable

Specified by:

start in interface org.neo4j.kernel.lifecycle.Lifecycle

Throws:

Throwable

stop

public void stop()
          throws Throwable

Specified by:

stop in interface org.neo4j.kernel.lifecycle.Lifecycle

Throws:

Throwable

shutdown

public void shutdown()

Specified by:

shutdown in interface org.neo4j.kernel.lifecycle.Lifecycle

refreshMasterFromZooKeeper

public String refreshMasterFromZooKeeper()

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.

Returns:

The master URI as a String

invalidateMaster

protected void invalidateMaster()

getCachedMaster

public Machine getCachedMaster()

getStoreId

protected org.neo4j.kernel.impl.nioneo.store.StoreId getStoreId()

getMyMachineId

protected int getMyMachineId()

subscribeToDataChangeWatcher

protected void subscribeToDataChangeWatcher(String child)

subscribeToChildrenChangeWatcher

protected void subscribeToChildrenChangeWatcher(String child)

setDataChangeWatcher

protected void setDataChangeWatcher(String child,
                                    int currentMasterId)

setDataChangeWatcher

protected void setDataChangeWatcher(String child,
                                    int currentMasterId,
                                    boolean skipOnSame)

Writes into one of master-notify or master-rebound the value given. If skipOnSame is true then if the value there is the same as the argument nothing will be written. A watch is always set on the node.

Parameters:

child - The node to write to

currentMasterId - The value to write

skipOnSame - If true, then if the existing value is the same as currentMasterId nothing will be written.

getRoot

public String getRoot()

getCurrentMasterNotify

public int getCurrentMasterNotify()

masterElectionHappened

protected void masterElectionHappened(Machine previousMaster,
                                      Machine newMaster)

getZooKeeper

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

getClusterStoreId

public org.neo4j.kernel.impl.nioneo.store.StoreId getClusterStoreId(org.neo4j.kernel.ha.cluster.zoo.ZooClient.WaitMode mode)

getClusterStoreId

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

asRootPath

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

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

getSequenceNr

protected String getSequenceNr()

toString

public String toString()

Overrides:

toString in class Object

addZooListener

public void addZooListener(ZooListener zooListener)

addCompatibilityModeListener

public void addCompatibilityModeListener(CompatibilityModeListener listener)

Specified by:

addCompatibilityModeListener in interface CompatibilityMonitor

removeCompatibilityModeListener

public void removeCompatibilityModeListener(CompatibilityModeListener listener)

Specified by:

removeCompatibilityModeListener in interface CompatibilityMonitor

getMasterBasedOn

protected ZooKeeperMachine getMasterBasedOn(Collection<ZooKeeperMachine> machines)

getAllMachines

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

getAllMachines

protected Map<Integer,ZooKeeperMachine> getAllMachines(boolean wait,
                                                       org.neo4j.kernel.ha.cluster.zoo.ZooClient.WaitMode mode)

getAllMachinesInner

protected Map<Integer,ZooKeeperMachine> getAllMachinesInner(boolean wait,
                                                            org.neo4j.kernel.ha.cluster.zoo.ZooClient.WaitMode mode)

getHaServer

protected Machine getHaServer(int machineId,
                              boolean wait)

getClusterServer

public String getClusterServer()

getHaServer

public String getHaServer()

refreshHaServers

protected void refreshHaServers()
                         throws org.apache.zookeeper.KeeperException

Throws:

org.apache.zookeeper.KeeperException

getHaServers

protected Iterable<Machine> getHaServers()

getNumberOfServers

protected int getNumberOfServers()

readHaServer

protected Machine readHaServer(int machineId,
                               boolean wait)

waitForSyncConnected

public final void waitForSyncConnected()

getSessionTimeout

protected int getSessionTimeout()

idFromPath

protected int idFromPath(String path)