Package org.apache.catalina.ha.session

Class DeltaManager

java.lang.Object
org.apache.catalina.util.LifecycleBase
org.apache.catalina.util.LifecycleMBeanBase
org.apache.catalina.session.ManagerBase
org.apache.catalina.ha.session.ClusterManagerBase
org.apache.catalina.ha.session.DeltaManager
All Implemented Interfaces:
MBeanRegistration, ClusterManager, JmxEnabled, Lifecycle, Manager
public class DeltaManager extends ClusterManagerBase
The DeltaManager manages replicated sessions by only replicating the deltas in data. For applications written to handle this, the DeltaManager is the optimal way of replicating data.

This code is almost identical to StandardManager with a difference in how it persists sessions and some modifications to it.

IMPLEMENTATION NOTE : Correct behavior of session storing and reloading depends upon external calls to the start() and stop() methods of this class at the correct times.

Author:
Craig R. McClanahan, Peter Rossbach

  • Field Details

    • log

      public final Log log

    • sm

      protected static final StringManager sm
      The string manager for this package.

    • name

      protected String name

  • Constructor Details

    • DeltaManager

      public DeltaManager()

  • Method Details

    • setName

      public void setName(String name)
      Description copied from interface: ClusterManager
      Set the name of the manager, at host /context name and at engine hostname+/context
      Parameters:
      name - The manager name

    • getName

      public String getName()
      Description copied from interface: ClusterManager
      Return the name of the manager, at host /context name and at engine hostname+/context.
      Specified by:
      getName in interface ClusterManager
      Overrides:
      getName in class ManagerBase
      Returns:
      The descriptive short name of this Manager implementation.

    • getCounterSend_EVT_GET_ALL_SESSIONS

      public long getCounterSend_EVT_GET_ALL_SESSIONS()
      Returns:
      Returns the counterSend_EVT_GET_ALL_SESSIONS.

    • getCounterSend_EVT_SESSION_ACCESSED

      public long getCounterSend_EVT_SESSION_ACCESSED()
      Returns:
      Returns the counterSend_EVT_SESSION_ACCESSED.

    • getCounterSend_EVT_SESSION_CREATED

      public long getCounterSend_EVT_SESSION_CREATED()
      Returns:
      Returns the counterSend_EVT_SESSION_CREATED.

    • getCounterSend_EVT_SESSION_DELTA

      public long getCounterSend_EVT_SESSION_DELTA()
      Returns:
      Returns the counterSend_EVT_SESSION_DELTA.

    • getCounterSend_EVT_SESSION_EXPIRED

      public long getCounterSend_EVT_SESSION_EXPIRED()
      Returns:
      Returns the counterSend_EVT_SESSION_EXPIRED.

    • getCounterSend_EVT_ALL_SESSION_DATA

      public long getCounterSend_EVT_ALL_SESSION_DATA()
      Returns:
      Returns the counterSend_EVT_ALL_SESSION_DATA.

    • getCounterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE

      public int getCounterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE()
      Returns:
      Returns the counterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE.

    • getCounterSend_EVT_CHANGE_SESSION_ID

      public long getCounterSend_EVT_CHANGE_SESSION_ID()
      Returns:
      Returns the counterSend_EVT_CHANGE_SESSION_ID.

    • getCounterReceive_EVT_ALL_SESSION_DATA

      public long getCounterReceive_EVT_ALL_SESSION_DATA()
      Returns:
      Returns the counterReceive_EVT_ALL_SESSION_DATA.

    • getCounterReceive_EVT_GET_ALL_SESSIONS

      public long getCounterReceive_EVT_GET_ALL_SESSIONS()
      Returns:
      Returns the counterReceive_EVT_GET_ALL_SESSIONS.

    • getCounterReceive_EVT_SESSION_ACCESSED

      public long getCounterReceive_EVT_SESSION_ACCESSED()
      Returns:
      Returns the counterReceive_EVT_SESSION_ACCESSED.

    • getCounterReceive_EVT_SESSION_CREATED

      public long getCounterReceive_EVT_SESSION_CREATED()
      Returns:
      Returns the counterReceive_EVT_SESSION_CREATED.

    • getCounterReceive_EVT_SESSION_DELTA

      public long getCounterReceive_EVT_SESSION_DELTA()
      Returns:
      Returns the counterReceive_EVT_SESSION_DELTA.

    • getCounterReceive_EVT_SESSION_EXPIRED

      public long getCounterReceive_EVT_SESSION_EXPIRED()
      Returns:
      Returns the counterReceive_EVT_SESSION_EXPIRED.

    • getCounterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE

      public int getCounterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE()
      Returns:
      Returns the counterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE.

    • getCounterReceive_EVT_CHANGE_SESSION_ID

      public long getCounterReceive_EVT_CHANGE_SESSION_ID()
      Returns:
      Returns the counterReceive_EVT_CHANGE_SESSION_ID.

    • getCounterReceive_EVT_ALL_SESSION_NOCONTEXTMANAGER

      public long getCounterReceive_EVT_ALL_SESSION_NOCONTEXTMANAGER()
      Returns:
      Returns the counterReceive_EVT_ALL_SESSION_NOCONTEXTMANAGER.

    • getSessionReplaceCounter

      public long getSessionReplaceCounter()
      Returns:
      Returns the sessionReplaceCounter.

    • getCounterNoStateTransfered

      @Deprecated public int getCounterNoStateTransfered()
      Deprecated.
      Use getCounterNoStateTransferred(). Will be removed in Tomcat 10 onwards.
      Returns:
      Returns the counterNoStateTransferred.

    • getCounterNoStateTransferred

      public int getCounterNoStateTransferred()
      Returns:
      Returns the counterNoStateTransferred.

    • getReceivedQueueSize

      public int getReceivedQueueSize()

    • getStateTransferTimeout

      public int getStateTransferTimeout()
      Returns:
      Returns the stateTransferTimeout.

    • setStateTransferTimeout

      public void setStateTransferTimeout(int timeoutAllSession)
      Parameters:
      timeoutAllSession - The timeout

    • getStateTransfered

      @Deprecated public boolean getStateTransfered()
      Deprecated.
      Use getStateTransferred(). Will be removed in Tomcat 10 onwards.
      Returns:
      true if the state transfer is complete.

    • setStateTransfered

      @Deprecated public void setStateTransfered(boolean stateTransferred)
      Deprecated.
      Use setStateTransferred(boolean). Will be removed in Tomcat 10 onwards.
      Set that state transferred is complete
      Parameters:
      stateTransferred - Flag value

    • getStateTransferred

      public boolean getStateTransferred()
      Returns:
      true if the state transfer is complete.

    • setStateTransferred

      public void setStateTransferred(boolean stateTransferred)
      Set that state transferred is complete
      Parameters:
      stateTransferred - Flag value

    • isNoContextManagerReceived

      public boolean isNoContextManagerReceived()

    • setNoContextManagerReceived

      public void setNoContextManagerReceived(boolean noContextManagerReceived)

    • getSendAllSessionsWaitTime

      public int getSendAllSessionsWaitTime()
      Returns:
      the sendAllSessionsWaitTime in msec

    • setSendAllSessionsWaitTime

      public void setSendAllSessionsWaitTime(int sendAllSessionsWaitTime)
      Parameters:
      sendAllSessionsWaitTime - The sendAllSessionsWaitTime to set at msec.

    • isStateTimestampDrop

      public boolean isStateTimestampDrop()
      Returns:
      the stateTimestampDrop.

    • setStateTimestampDrop

      public void setStateTimestampDrop(boolean isTimestampDrop)
      Parameters:
      isTimestampDrop - The new flag value

    • isSendAllSessions

      public boolean isSendAllSessions()
      Returns:
      the sendAllSessions.

    • setSendAllSessions

      public void setSendAllSessions(boolean sendAllSessions)
      Parameters:
      sendAllSessions - The sendAllSessions to set.

    • getSendAllSessionsSize

      public int getSendAllSessionsSize()
      Returns:
      the sendAllSessionsSize.

    • setSendAllSessionsSize

      public void setSendAllSessionsSize(int sendAllSessionsSize)
      Parameters:
      sendAllSessionsSize - The sendAllSessionsSize to set.

    • isNotifySessionListenersOnReplication

      public boolean isNotifySessionListenersOnReplication()
      Returns:
      the notifySessionListenersOnReplication.

    • setNotifySessionListenersOnReplication

      public void setNotifySessionListenersOnReplication(boolean notifyListenersCreateSessionOnReplication)
      Parameters:
      notifyListenersCreateSessionOnReplication - The notifySessionListenersOnReplication to set.

    • isExpireSessionsOnShutdown

      public boolean isExpireSessionsOnShutdown()

    • setExpireSessionsOnShutdown

      public void setExpireSessionsOnShutdown(boolean expireSessionsOnShutdown)

    • isNotifyContainerListenersOnReplication

      public boolean isNotifyContainerListenersOnReplication()

    • setNotifyContainerListenersOnReplication

      public void setNotifyContainerListenersOnReplication(boolean notifyContainerListenersOnReplication)

    • createSession

      public Session createSession(String sessionId)
      Description copied from interface: Manager
      Construct and return a new session object, based on the default settings specified by this Manager's properties. The session id specified will be used as the session id. If a new session cannot be created for any reason, return null.
      Specified by:
      createSession in interface Manager
      Overrides:
      createSession in class ManagerBase
      Parameters:
      sessionId - The session id which should be used to create the new session; if null, the session id will be assigned by this method, and available via the getId() method of the returned session.
      Returns:
      An empty Session object with the given ID or a newly created session ID if none was specified

    • createSession

      public Session createSession(String sessionId, boolean distribute)
      Create new session with check maxActiveSessions and send session creation to other cluster nodes.
      Parameters:
      sessionId - The session id that should be used for the session
      distribute - true to replicate the new session
      Returns:
      The session

    • sendCreateSession

      protected void sendCreateSession(String sessionId, DeltaSession session)
      Send create session event to all backup node
      Parameters:
      sessionId - The session id of the session
      session - The session object

    • send

      protected void send(SessionMessage msg)
      Send messages to other backup member (domain or all)
      Parameters:
      msg - Session message

    • createEmptySession

      public Session createEmptySession()
      Get a session from the recycled ones or create a new empty one. The PersistentManager manager does not need to create session data because it reads it from the Store.

      Creates new DeltaSession instance.

      Specified by:
      createEmptySession in interface Manager
      Overrides:
      createEmptySession in class ManagerBase
      Returns:
      An empty Session object

    • getNewDeltaSession

      @Deprecated protected DeltaSession getNewDeltaSession()
      Deprecated.
      Unused. This will be removed in Tomcat 10.
      Get new session class to be used in the doLoad() method.
      Returns:
      a new session

    • changeSessionId

      public void changeSessionId(Session session)
      Description copied from interface: Manager
      Change the session ID of the current session to a new randomly generated session ID.
      Specified by:
      changeSessionId in interface Manager
      Overrides:
      changeSessionId in class ManagerBase
      Parameters:
      session - The session to change the session ID for

    • rotateSessionId

      public String rotateSessionId(Session session)
      Description copied from interface: Manager
      Change the session ID of the current session to a new randomly generated session ID.
      Specified by:
      rotateSessionId in interface Manager
      Overrides:
      rotateSessionId in class ManagerBase
      Parameters:
      session - The session to change the session ID for
      Returns:
      The new session ID

    • changeSessionId

      public void changeSessionId(Session session, String newId)
      Description copied from interface: Manager
      Change the session ID of the current session to a specified session ID.
      Specified by:
      changeSessionId in interface Manager
      Overrides:
      changeSessionId in class ManagerBase
      Parameters:
      session - The session to change the session ID for
      newId - new session ID

    • changeSessionId

      @Deprecated protected void changeSessionId(Session session, boolean notify)
      Deprecated.
      Will be removed in Tomcat 10
      Parameters:
      session - The session
      notify - Notify change

    • rotateSessionId

      protected String rotateSessionId(Session session, boolean notify)

    • changeSessionId

      protected void changeSessionId(Session session, String newId, boolean notify)

    • sendChangeSessionId

      protected void sendChangeSessionId(String newSessionID, String orgSessionID)

    • serializeSessionId

      protected byte[] serializeSessionId(String sessionId) throws IOException
      serialize sessionID
      Parameters:
      sessionId - Session id to serialize
      Returns:
      byte array with serialized session id
      Throws:
      IOException - if an input/output error occurs

    • deserializeSessionId

      protected String deserializeSessionId(byte[] data) throws IOException
      Load sessionID
      Parameters:
      data - serialized session id
      Returns:
      session id
      Throws:
      IOException - if an input/output error occurs

    • deserializeDeltaRequest

      @Deprecated protected DeltaRequest deserializeDeltaRequest(DeltaSession session, byte[] data) throws ClassNotFoundException, IOException
      Deprecated.
      Unused. This will be removed in Tomcat 10. Calling this method may result in a deadlock. See: https://bz.apache.org/bugzilla/show_bug.cgi?id=62841
      Load Deltarequest from external node Load the Class at container classloader
      Parameters:
      session - Corresponding session
      data - message data
      Returns:
      The request
      Throws:
      ClassNotFoundException - Serialization error
      IOException - IO error with serialization
      See Also:

    • serializeDeltaRequest

      @Deprecated protected byte[] serializeDeltaRequest(DeltaSession session, DeltaRequest deltaRequest) throws IOException
      Deprecated.
      Unused. This will be removed in Tomcat 10. Calling this method may result in a deadlock. See: https://bz.apache.org/bugzilla/show_bug.cgi?id=62841
      serialize DeltaRequest
      Parameters:
      session - Associated session
      deltaRequest - The request to serialize
      Returns:
      serialized delta request
      Throws:
      IOException - IO error with serialization
      See Also:

    • deserializeSessions

      protected void deserializeSessions(byte[] data) throws ClassNotFoundException, IOException
      Load sessions from other cluster node.

      FIXME replace currently sessions with same id without notification.

      FIXME SSO handling is not really correct with the session replacement!

      Parameters:
      data - Serialized data
      Throws:
      ClassNotFoundException - if a serialized class cannot be found during the reload
      IOException - if an input/output error occurs

    • serializeSessions

      protected byte[] serializeSessions(Session[] currentSessions) throws IOException
      Save any currently active sessions in the appropriate persistence mechanism, if any. If persistence is not supported, this method returns without doing anything.
      Parameters:
      currentSessions - Sessions to serialize
      Returns:
      serialized data
      Throws:
      IOException - if an input/output error occurs

    • startInternal

      protected void startInternal() throws LifecycleException
      Start this component and implement the requirements of LifecycleBase.startInternal().
      Overrides:
      startInternal in class ClusterManagerBase
      Throws:
      LifecycleException - if this component detects a fatal error that prevents this component from being used

    • getAllClusterSessions

      public void getAllClusterSessions()
      get from first session master the backup from all clustered sessions
      See Also:

    • findSessionMasterMember

      protected Member findSessionMasterMember()
      Find the master of the session state
      Returns:
      master member of sessions

    • waitForSendAllSessions

      protected void waitForSendAllSessions(long beforeSendTime)
      Wait that cluster session state is transferred or timeout after 60 Sec With stateTransferTimeout == -1 wait that backup is transferred (forever mode)
      Parameters:
      beforeSendTime - Start instant of the operation

    • stopInternal

      protected void stopInternal() throws LifecycleException
      Stop this component and implement the requirements of LifecycleBase.stopInternal().
      Overrides:
      stopInternal in class ClusterManagerBase
      Throws:
      LifecycleException - if this component detects a fatal error that prevents this component from being used

    • messageDataReceived

      public void messageDataReceived(ClusterMessage cmsg)
      Description copied from interface: ClusterManager
      A message was received from another node, this is the callback method to implement if you are interested in receiving replication messages.
      Parameters:
      cmsg - - the message received.

    • requestCompleted

      public ClusterMessage requestCompleted(String sessionId)
      Description copied from interface: ClusterManager
      When the request has been completed, the replication valve will notify the manager, and the manager will decide whether any replication is needed or not. If there is a need for replication, the manager will create a session message and that will be replicated. The cluster determines where it gets sent.
      Parameters:
      sessionId - - the sessionId that just completed.
      Returns:
      a SessionMessage to be sent.

    • requestCompleted

      public ClusterMessage requestCompleted(String sessionId, boolean expires)
      When the request has been completed, the replication valve will notify the manager, and the manager will decide whether any replication is needed or not. If there is a need for replication, the manager will create a session message and that will be replicated. The cluster determines where it gets sent. Session expiration also calls this method, but with expires == true.
      Parameters:
      sessionId - - the sessionId that just completed.
      expires - - whether this method has been called during session expiration
      Returns:
      a SessionMessage to be sent,

    • resetStatistics

      public void resetStatistics()
      Reset manager statistics

    • sessionExpired

      protected void sessionExpired(String id)
      send session expired to other cluster nodes
      Parameters:
      id - session id

    • expireAllLocalSessions

      public void expireAllLocalSessions()
      Expire all find sessions.

    • getInvalidatedSessions

      public String[] getInvalidatedSessions()
      Description copied from interface: ClusterManager
      When the manager expires session not tied to a request. The cluster will periodically ask for a list of sessions that should expire and that should be sent across the wire.
      Returns:
      String[] The invalidated sessions

    • messageReceived

      protected void messageReceived(SessionMessage msg, Member sender)
      This method is called by the received thread when a SessionMessage has been received from one of the other nodes in the cluster.
      Parameters:
      msg - - the message received
      sender - - the sender of the message, this is used if we receive a EVT_GET_ALL_SESSION message, so that we only reply to the requesting node

    • handleALL_SESSION_TRANSFERCOMPLETE

      protected void handleALL_SESSION_TRANSFERCOMPLETE(SessionMessage msg, Member sender)
      handle receive session state is complete transferred
      Parameters:
      msg - Session message
      sender - Member which sent the message

    • handleSESSION_DELTA

      protected void handleSESSION_DELTA(SessionMessage msg, Member sender) throws IOException, ClassNotFoundException
      handle receive session delta
      Parameters:
      msg - Session message
      sender - Member which sent the message
      Throws:
      IOException - IO error with serialization
      ClassNotFoundException - Serialization error

    • handleSESSION_ACCESSED

      protected void handleSESSION_ACCESSED(SessionMessage msg, Member sender) throws IOException
      handle receive session is access at other node ( primary session is now false)
      Parameters:
      msg - Session message
      sender - Member which sent the message
      Throws:
      IOException - Propagated IO error

    • handleSESSION_EXPIRED

      protected void handleSESSION_EXPIRED(SessionMessage msg, Member sender) throws IOException
      handle receive session is expire at other node ( expire session also here)
      Parameters:
      msg - Session message
      sender - Member which sent the message
      Throws:
      IOException - Propagated IO error

    • handleSESSION_CREATED

      protected void handleSESSION_CREATED(SessionMessage msg, Member sender)
      handle receive new session is created at other node (create backup - primary false)
      Parameters:
      msg - Session message
      sender - Member which sent the message

    • handleALL_SESSION_DATA

      protected void handleALL_SESSION_DATA(SessionMessage msg, Member sender) throws ClassNotFoundException, IOException
      handle receive sessions from other not ( restart )
      Parameters:
      msg - Session message
      sender - Member which sent the message
      Throws:
      ClassNotFoundException - Serialization error
      IOException - IO error with serialization

    • handleGET_ALL_SESSIONS

      protected void handleGET_ALL_SESSIONS(SessionMessage msg, Member sender) throws IOException
      Handle a get all sessions message from another node. Depending on sendAllSessions, sessions are either sent in a single message or in batches. Sending is complete when this method exits.
      Parameters:
      msg - Session message
      sender - Member which sent the message
      Throws:
      IOException - IO error sending messages

    • handleCHANGE_SESSION_ID

      protected void handleCHANGE_SESSION_ID(SessionMessage msg, Member sender) throws IOException
      handle receive change sessionID at other node
      Parameters:
      msg - Session message
      sender - Member which sent the message
      Throws:
      IOException - IO error with serialization

    • handleALL_SESSION_NOCONTEXTMANAGER

      protected void handleALL_SESSION_NOCONTEXTMANAGER(SessionMessage msg, Member sender)
      handle receive no context manager.
      Parameters:
      msg - Session message
      sender - Member which sent the message

    • sendSessions

      protected void sendSessions(Member sender, Session[] currentSessions, long sendTimestamp) throws IOException
      send a block of session to sender
      Parameters:
      sender - Sender member
      currentSessions - Sessions to send
      sendTimestamp - Timestamp
      Throws:
      IOException - IO error sending messages

    • cloneFromTemplate

      public ClusterManager cloneFromTemplate()
      Returns:
      a clone of a template manager configuration