sunlabs.brazil.session
Class CacheManager

java.lang.Object
  sunlabs.brazil.session.SessionManager
      sunlabs.brazil.session.CacheManager (view source)

All Implemented Interfaces:

Handler

Direct Known Subclasses:

PropertiesCacheManager

public class CacheManager
extends SessionManager
implements Handler

This SessionManager associates an object with a Session ID to give Handlers the ability to maintain state that lasts for the duration of a session instead of just for the duration of a request. It should be installed as a handler, whoses init method will replace the default session manager.

This version maintains a pool of hashtables. Once they all fill up - one of them gets tossed, causing any session info in it to be lost. It uses a simplified approximate LRU scheme. The default session manager doesn't loose any session information, but grows the heap without bound as the number of sessions increase.

properties:

tables

The number of Hashtables in the pool (defaults to 6)

size

The max number of entries in each table (defaults to 1000).

Constructor Summary

CacheManager()

Method Summary

boolean	init(Server server, String prefix) Install this class as the session manager.
void	removeObj(Object session, Object ident) Remove an object from a session table.
boolean	respond(Request request) Don't handle any URL requests (yet)

Methods inherited from class sunlabs.brazil.session.SessionManager

get, getSession, put, remove, setSessionManager

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheManager

public CacheManager()

Method Detail

init

public boolean init(Server server,
                    String prefix)

Install this class as the session manager. Get the number of tables, and the max size per table.

Specified by:

init in interface Handler

Parameters:

server - The HTTP server that created this Handler. Typical Handlers will use Server.props to obtain run-time configuration information.

prefix - The handlers name. The string this Handler may prepend to all of the keys that it uses to extract configuration information from Server.props. This is set (by the Server and ChainHandler) to help avoid configuration parameter namespace collisions.

Returns:

true if this Handler initialized successfully, false otherwise. If false is returned, this Handler should not be used.

respond

public boolean respond(Request request)

Don't handle any URL requests (yet)

Specified by:

respond in interface Handler

Parameters:

request - The Request object that represents the HTTP request.

Returns:

true if the request was handled. A request was handled if a response was supplied to the client, typically by calling Request.sendResponse() or Request.sendError.

removeObj

public void removeObj(Object session,
                      Object ident)

Remove an object from a session table. Don't bother to remove the table if its empty