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package org.apache.catalina;
import java.beans.PropertyChangeListener;
import java.io.IOException;
/**
* A <b>Store</b> is the abstraction of a Catalina component that provides
* persistent storage and loading of Sessions and their associated user data.
* Implementations are free to save and load the Sessions to any media they
* wish, but it is assumed that saved Sessions are persistent across
* server or context restarts.
*
* @author Craig R. McClanahan
* @version $Revision: 1.2 $ $Date: 2005/12/08 01:27:21 $
*/
public interface Store {
// ------------------------------------------------------------- Properties
/**
* Return descriptive information about this Store implementation and
* the corresponding version number, in the format
* <code><description>/<version></code>.
*/
public String getInfo();
/**
* Return the Manager instance associated with this Store.
*/
public Manager getManager();
/**
* Set the Manager associated with this Store.
*
* @param manager The Manager which will use this Store.
*/
public void setManager(Manager manager);
/**
* Return the number of Sessions present in this Store.
*
* @exception IOException if an input/output error occurs
*/
public int getSize() throws IOException;
// --------------------------------------------------------- Public Methods
/**
* Add a property change listener to this component.
*
* @param listener The listener to add
*/
public void addPropertyChangeListener(PropertyChangeListener listener);
/**
* Return an array containing the session identifiers of all Sessions
* currently saved in this Store. If there are no such Sessions, a
* zero-length array is returned.
*
* @exception IOException if an input/output error occurred
*/
public String[] keys() throws IOException;
/**
* Load and return the Session associated with the specified session
* identifier from this Store, without removing it. If there is no
* such stored Session, return <code>null</code>.
*
* @param id Session identifier of the session to load
*
* @exception ClassNotFoundException if a deserialization error occurs
* @exception IOException if an input/output error occurs
*/
public Session load(String id)
throws ClassNotFoundException, IOException;
/**
* Remove the Session with the specified session identifier from
* this Store, if present. If no such Session is present, this method
* takes no action.
*
* @param id Session identifier of the Session to be removed
*
* @exception IOException if an input/output error occurs
*/
public void remove(String id) throws IOException;
/**
* Remove all Sessions from this Store.
*/
public void clear() throws IOException;
/**
* Remove a property change listener from this component.
*
* @param listener The listener to remove
*/
public void removePropertyChangeListener(PropertyChangeListener listener);
/**
* Save the specified Session into this Store. Any previously saved
* information for the associated session identifier is replaced.
*
* @param session Session to be saved
*
* @exception IOException if an input/output error occurs
*/
public void save(Session session) throws IOException;
}