Package org.apache.zookeeper.server.quorum

Class LearnerZooKeeperServer

java.lang.Object

org.apache.zookeeper.server.ZooKeeperServer

org.apache.zookeeper.server.quorum.QuorumZooKeeperServer

org.apache.zookeeper.server.quorum.LearnerZooKeeperServer

All Implemented Interfaces:

ServerStats.Provider, SessionTracker.SessionExpirer

Direct Known Subclasses:

FollowerZooKeeperServer, ObserverZooKeeperServer

public abstract class LearnerZooKeeperServer
extends QuorumZooKeeperServer

Parent class for all ZooKeeperServers for Learners

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.zookeeper.server.ZooKeeperServer

ZooKeeperServer.BasicDataTreeBuilder, ZooKeeperServer.DataTreeBuilder, ZooKeeperServer.MissingSessionException, ZooKeeperServer.State

Field Summary

Fields inherited from class org.apache.zookeeper.server.quorum.QuorumZooKeeperServer

self

Fields inherited from class org.apache.zookeeper.server.ZooKeeperServer

DEFAULT_TICK_TIME, firstProcessor, jmxDataTreeBean, jmxServerBean, LOG, maxSessionTimeout, minSessionTimeout, ok, sessionTracker, state, tickTime

Constructor Summary

Constructors

Constructor	Description
LearnerZooKeeperServer(FileTxnSnapLog logFactory, int tickTime, int minSessionTimeout, int maxSessionTimeout, ZooKeeperServer.DataTreeBuilder treeBuilder, ZKDatabase zkDb, QuorumPeer self)

Method Summary

Modifier and Type	Method	Description
void	createSessionTracker()
abstract Learner	getLearner()	Abstract method to return the learner associated with this server.
long	getServerId()	Returns the id of the associated QuorumPeer, which will do for a unique id of this server.
protected java.util.HashMap<java.lang.Long,java.lang.Integer>	getTouchSnapshot()	Returns the current state of the session tracker.
protected void	registerJMX()
void	registerJMX(ZooKeeperServerBean serverBean, LocalPeerBean localPeerBean)
protected void	revalidateSession(ServerCnxn cnxn, long sessionId, int sessionTimeout)
protected void	startSessionTracker()
protected void	unregisterJMX()
protected void	unregisterJMX(Learner peer)

Methods inherited from class org.apache.zookeeper.server.quorum.QuorumZooKeeperServer

dumpConf, setState

Methods inherited from class org.apache.zookeeper.server.ZooKeeperServer

canShutdown, checkPasswd, closeSession, closeSession, decInProcess, dumpEphemerals, expire, finishSessionInit, getClientPort, getGlobalOutstandingLimit, getInProcess, getLastProcessedZxid, getMaxSessionTimeout, getMinSessionTimeout, getNumAliveConnections, getOutstandingRequests, getServerCnxnFactory, getSnapCount, getState, getTickTime, getTxnLogFactory, getZKDatabase, getZooKeeperServerListener, getZxid, incInProcess, isRunning, killSession, loadData, processConnectRequest, processPacket, processTxn, reopenSession, serverStats, setMaxSessionTimeout, setMinSessionTimeout, setOwner, setServerCnxnFactory, setTickTime, setTxnLogFactory, setupRequestProcessors, setZKDatabase, setZxid, shouldThrottle, shutdown, shutdown, startdata, startup, submitRequest, takeSnapshot, truncateLog

Methods inherited from class java.lang.Object

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

Constructor Detail

LearnerZooKeeperServer

public LearnerZooKeeperServer(FileTxnSnapLog logFactory,
                              int tickTime,
                              int minSessionTimeout,
                              int maxSessionTimeout,
                              ZooKeeperServer.DataTreeBuilder treeBuilder,
                              ZKDatabase zkDb,
                              QuorumPeer self)
                       throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getLearner

public abstract Learner getLearner()

Abstract method to return the learner associated with this server. Since the Learner may change under our feet (when QuorumPeer reassigns it) we can't simply take a reference here. Instead, we need the subclasses to implement this.

getTouchSnapshot

protected java.util.HashMap<java.lang.Long,java.lang.Integer> getTouchSnapshot()

Returns the current state of the session tracker. This is only currently used by a Learner to build a ping response packet.

getServerId

public long getServerId()

Returns the id of the associated QuorumPeer, which will do for a unique id of this server.

Specified by:

getServerId in interface SessionTracker.SessionExpirer

Overrides:

getServerId in class ZooKeeperServer

createSessionTracker

public void createSessionTracker()

Overrides:

createSessionTracker in class ZooKeeperServer

startSessionTracker

protected void startSessionTracker()

Overrides:

startSessionTracker in class ZooKeeperServer

revalidateSession

protected void revalidateSession(ServerCnxn cnxn,
                                 long sessionId,
                                 int sessionTimeout)
                          throws java.io.IOException

Overrides:

revalidateSession in class ZooKeeperServer

Throws:

java.io.IOException

registerJMX

protected void registerJMX()

Overrides:

registerJMX in class ZooKeeperServer

registerJMX

public void registerJMX(ZooKeeperServerBean serverBean,
                        LocalPeerBean localPeerBean)

unregisterJMX

protected void unregisterJMX()

Overrides:

unregisterJMX in class ZooKeeperServer

unregisterJMX

protected void unregisterJMX(Learner peer)