org.apache.catalina
Interface Manager

All Known Implementing Classes:
ManagerBase

public interface Manager

A Manager manages the pool of Sessions that are associated with a particular Container. Different Manager implementations may support value-added features such as the persistent storage of session data, as well as migrating sessions for distributable web applications.

In order for a Manager implementation to successfully operate with a Context implementation that implements reloading, it must obey the following constraints:

Version:
$Revision: 1.5 $ $Date: 2001/07/22 20:13:30 $
Author:
Craig R. McClanahan

Method Summary
 void add(Session session)
          Add this Session to the set of active Sessions for this Manager.
 void addPropertyChangeListener(java.beans.PropertyChangeListener listener)
          Add a property change listener to this component.
 Session createSession()
          Construct and return a new session object, based on the default settings specified by this Manager's properties.
 Session findSession(java.lang.String id)
          Return the active Session, associated with this Manager, with the specified session id (if any); otherwise return null.
 Session[] findSessions()
          Return the set of active Sessions associated with this Manager.
 Container getContainer()
          Return the Container with which this Manager is associated.
 boolean getDistributable()
          Return the distributable flag for the sessions supported by this Manager.
 java.lang.String getInfo()
          Return descriptive information about this Manager implementation and the corresponding version number, in the format <description>/<version>.
 int getMaxInactiveInterval()
          Return the default maximum inactive interval (in seconds) for Sessions created by this Manager.
 void load()
          Load any currently active sessions that were previously unloaded to the appropriate persistence mechanism, if any.
 void remove(Session session)
          Remove this Session from the active Sessions for this Manager.
 void removePropertyChangeListener(java.beans.PropertyChangeListener listener)
          Remove a property change listener from this component.
 void setContainer(Container container)
          Set the Container with which this Manager is associated.
 void setDistributable(boolean distributable)
          Set the distributable flag for the sessions supported by this Manager.
 void setMaxInactiveInterval(int interval)
          Set the default maximum inactive interval (in seconds) for Sessions created by this Manager.
 void unload()
          Save any currently active sessions in the appropriate persistence mechanism, if any.
 

Method Detail

getContainer

public Container getContainer()
Return the Container with which this Manager is associated.


setContainer

public void setContainer(Container container)
Set the Container with which this Manager is associated.

Parameters:
container - The newly associated Container

getDistributable

public boolean getDistributable()
Return the distributable flag for the sessions supported by this Manager.


setDistributable

public void setDistributable(boolean distributable)
Set the distributable flag for the sessions supported by this Manager. If this flag is set, all user data objects added to sessions associated with this manager must implement Serializable.

Parameters:
distributable - The new distributable flag

getInfo

public java.lang.String getInfo()
Return descriptive information about this Manager implementation and the corresponding version number, in the format <description>/<version>.


getMaxInactiveInterval

public int getMaxInactiveInterval()
Return the default maximum inactive interval (in seconds) for Sessions created by this Manager.


setMaxInactiveInterval

public void setMaxInactiveInterval(int interval)
Set the default maximum inactive interval (in seconds) for Sessions created by this Manager.

Parameters:
interval - The new default value

add

public void add(Session session)
Add this Session to the set of active Sessions for this Manager.

Parameters:
session - Session to be added

addPropertyChangeListener

public void addPropertyChangeListener(java.beans.PropertyChangeListener listener)
Add a property change listener to this component.

Parameters:
listener - The listener to add

createSession

public Session createSession()
Construct and return a new session object, based on the default settings specified by this Manager's properties. The session id will be assigned by this method, and available via the getId() method of the returned session. If a new session cannot be created for any reason, return null.

Throws:
java.lang.IllegalStateException - if a new session cannot be instantiated for any reason

findSession

public Session findSession(java.lang.String id)
                    throws java.io.IOException
Return the active Session, associated with this Manager, with the specified session id (if any); otherwise return null.

Parameters:
id - The session id for the session to be returned
Throws:
java.lang.IllegalStateException - if a new session cannot be instantiated for any reason
java.io.IOException - if an input/output error occurs while processing this request

findSessions

public Session[] findSessions()
Return the set of active Sessions associated with this Manager. If this Manager has no active Sessions, a zero-length array is returned.


load

public void load()
          throws java.lang.ClassNotFoundException,
                 java.io.IOException
Load any currently active sessions that were previously unloaded to the appropriate persistence mechanism, if any. If persistence is not supported, this method returns without doing anything.

Throws:
java.lang.ClassNotFoundException - if a serialized class cannot be found during the reload
java.io.IOException - if an input/output error occurs

remove

public void remove(Session session)
Remove this Session from the active Sessions for this Manager.

Parameters:
session - Session to be removed

removePropertyChangeListener

public void removePropertyChangeListener(java.beans.PropertyChangeListener listener)
Remove a property change listener from this component.

Parameters:
listener - The listener to remove

unload

public void unload()
            throws java.io.IOException
Save any currently active sessions in the appropriate persistence mechanism, if any. If persistence is not supported, this method returns without doing anything.

Throws:
java.io.IOException - if an input/output error occurs


Copyright 2000-2001 Apache Software Foundation. All Rights Reserved.