scone.netobjects
Class AccessCache

java.lang.Object
  java.util.Observable
      scone.netobjects.AccessCache

All Implemented Interfaces:

TableRecordCacheInterface

public class AccessCache
extends java.util.Observable
implements TableRecordCacheInterface

caches the access table from the database and provides means to update the database

Author:

Harald Weinreich, Volkert Buchmann

Field Summary

protected static CacheTable	cache
static java.lang.Object	lock
protected static AccessCache	observable

Constructor Summary

AccessCache()

Method Summary

static void	broadcastEvent(AccessEvent event)
static void	clean()
static java.lang.String	createKey(java.lang.String userId, java.lang.String nodeId, java.lang.String timeString, java.lang.String frameName)
static Access	get(java.lang.String userId, java.lang.String nodeId, long time, java.lang.String frameName) returns an Access object to a specific key
static int	getAccessCount(java.lang.String sqlClause) This method returns a number of Accesses to a given query string.
static int	getAccessCount(java.lang.String tables, java.lang.String sqlClause) This method returns a number of Accesses to a given query string.
static java.util.Vector	getAccesses(java.lang.String sqlClause) This method returns a Vector of Access-Objects to a given query string
static void	init(int timeTillCleanUp, int gcType) creates a new CacheTable, generates a new Connection and a lock object
static void	putObserver(java.util.Observer o) adds an Observer to the AccessCache class.
static void	removeObserver(java.util.Observer o) removes an Observer from the AccessCache class.

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

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

Field Detail

cache

protected static CacheTable cache

lock

public static java.lang.Object lock

observable

protected static AccessCache observable

Constructor Detail

AccessCache

public AccessCache()

Method Detail

init

public static void init(int timeTillCleanUp,
                        int gcType)

creates a new CacheTable, generates a new Connection and a lock object

Parameters:

timeTillCleanUp - how long between runs of clean()

gcType - how soon are the objects removed from the memory

get

public static Access get(java.lang.String userId,
                         java.lang.String nodeId,
                         long time,
                         java.lang.String frameName)

returns an Access object to a specific key

Parameters:

userId: - The id of the user (from cookie)

nodeId: - The current Node

time: - The (start) time of the access

frameName: - Name of the frame or window (given or generated by Scone)

getAccesses

public static java.util.Vector getAccesses(java.lang.String sqlClause)

This method returns a Vector of Access-Objects to a given query string

Parameters:

sqlClause - The where clause for the query string.

getAccessCount

public static int getAccessCount(java.lang.String tables,
                                 java.lang.String sqlClause)

This method returns a number of Accesses to a given query string.

Parameters:

tables - The table names.

sqlClause - The where clause for the query string.

Returns:

The number of nodes.

getAccessCount

public static int getAccessCount(java.lang.String sqlClause)

This method returns a number of Accesses to a given query string.

Parameters:

sqlClause - The where clause for the query string.

Returns:

The number of nodes.

createKey

public static java.lang.String createKey(java.lang.String userId,
                                         java.lang.String nodeId,
                                         java.lang.String timeString,
                                         java.lang.String frameName)

clean

public static void clean()

putObserver

public static void putObserver(java.util.Observer o)

adds an Observer to the AccessCache class.
Use this static method instead of addObserver() !

Parameters:

o - the Observer

removeObserver

public static void removeObserver(java.util.Observer o)

removes an Observer from the AccessCache class.
Use this static method instead of deleteObserver() !

Parameters:

o - the Observer

broadcastEvent

public static void broadcastEvent(AccessEvent event)