Class LeaderSessionTracker
- java.lang.Object
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- org.apache.zookeeper.server.quorum.UpgradeableSessionTracker
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- org.apache.zookeeper.server.quorum.LeaderSessionTracker
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- All Implemented Interfaces:
SessionTracker
public class LeaderSessionTracker extends UpgradeableSessionTracker
The leader session tracker tracks local and global sessions on the leader.
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Nested Class Summary
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Nested classes/interfaces inherited from interface org.apache.zookeeper.server.SessionTracker
SessionTracker.Session, SessionTracker.SessionExpirer
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Field Summary
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Fields inherited from class org.apache.zookeeper.server.quorum.UpgradeableSessionTracker
localSessionsEnabled, localSessionTracker
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Constructor Summary
Constructors Constructor Description LeaderSessionTracker(SessionTracker.SessionExpirer expirer, ConcurrentMap<Long,Integer> sessionsWithTimeouts, int tickTime, long id, boolean localSessionsEnabled, ZooKeeperServerListener listener)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description voidcheckGlobalSession(long sessionId, Object owner)Strictly check that a given session is a global session or notvoidcheckSession(long sessionId, Object owner)Checks whether the SessionTracker is aware of this session, the session is still active, and the owner matches.booleancommitSession(long sessionId, int sessionTimeout)Synchronized on this to avoid race condition of adding a local session after committed global session, which may cause the same session being tracked on this server and leader.longcreateSession(int sessionTimeout)voiddumpSessions(PrintWriter pwriter)Text dump of session information, suitable for debugging.static longgetServerIdFromSessionId(long sessionId)Map<Long,Set<Long>>getSessionExpiryMap()Returns a mapping of time to session IDs that expire at that time.Set<Long>globalSessions()Get a set of global session IDsbooleanisGlobalSession(long sessionId)voidremoveSession(long sessionId)voidsetOwner(long sessionId, Object owner)voidsetSessionClosing(long sessionId)Mark that the session is in the process of closing.voidshutdown()voidstart()booleantouchSession(long sessionId, int sessionTimeout)booleantrackSession(long sessionId, int sessionTimeout)Track the session expire, not add to ZkDb.-
Methods inherited from class org.apache.zookeeper.server.quorum.UpgradeableSessionTracker
createLocalSessionTracker, finishedUpgrading, getLocalSessionCount, isLocalSession, isLocalSessionsEnabled, isTrackingSession, isUpgradingSession, localSessions, removeLocalSession, upgradeSession
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Constructor Detail
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LeaderSessionTracker
public LeaderSessionTracker(SessionTracker.SessionExpirer expirer, ConcurrentMap<Long,Integer> sessionsWithTimeouts, int tickTime, long id, boolean localSessionsEnabled, ZooKeeperServerListener listener)
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Method Detail
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removeSession
public void removeSession(long sessionId)
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start
public void start()
- Overrides:
startin classUpgradeableSessionTracker
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shutdown
public void shutdown()
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isGlobalSession
public boolean isGlobalSession(long sessionId)
- Specified by:
isGlobalSessionin classUpgradeableSessionTracker
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trackSession
public boolean trackSession(long sessionId, int sessionTimeout)Description copied from interface:SessionTrackerTrack the session expire, not add to ZkDb.- Parameters:
sessionId- sessionIdsessionTimeout- sessionTimeout- Returns:
- whether the session was newly tracked (if false, already tracked)
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commitSession
public boolean commitSession(long sessionId, int sessionTimeout)Synchronized on this to avoid race condition of adding a local session after committed global session, which may cause the same session being tracked on this server and leader.- Parameters:
sessionId- sessionIdsessionTimeout- sessionTimeout- Returns:
- whether the session was newly added (if false, already existed)
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touchSession
public boolean touchSession(long sessionId, int sessionTimeout)- Returns:
- false if session is no longer active
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createSession
public long createSession(int sessionTimeout)
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getServerIdFromSessionId
public static long getServerIdFromSessionId(long sessionId)
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checkSession
public void checkSession(long sessionId, Object owner) throws KeeperException.SessionExpiredException, KeeperException.SessionMovedException, KeeperException.UnknownSessionExceptionDescription copied from interface:SessionTrackerChecks whether the SessionTracker is aware of this session, the session is still active, and the owner matches. If the owner wasn't previously set, this sets the owner of the session. UnknownSessionException should never been thrown to the client. It is only used internally to deal with possible local session from other machine
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checkGlobalSession
public void checkGlobalSession(long sessionId, Object owner) throws KeeperException.SessionExpiredException, KeeperException.SessionMovedExceptionDescription copied from interface:SessionTrackerStrictly check that a given session is a global session or not- Specified by:
checkGlobalSessionin interfaceSessionTracker- Overrides:
checkGlobalSessionin classUpgradeableSessionTracker- Throws:
KeeperException.SessionExpiredExceptionKeeperException.SessionMovedException
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setOwner
public void setOwner(long sessionId, Object owner) throws KeeperException.SessionExpiredException
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dumpSessions
public void dumpSessions(PrintWriter pwriter)
Description copied from interface:SessionTrackerText dump of session information, suitable for debugging.- Parameters:
pwriter- the output writer
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setSessionClosing
public void setSessionClosing(long sessionId)
Description copied from interface:SessionTrackerMark that the session is in the process of closing.
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getSessionExpiryMap
public Map<Long,Set<Long>> getSessionExpiryMap()
Description copied from interface:SessionTrackerReturns a mapping of time to session IDs that expire at that time.
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globalSessions
public Set<Long> globalSessions()
Description copied from interface:SessionTrackerGet a set of global session IDs
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