universe.server.database
Class DatabaseDiskbased

java.lang.Object
  |
  +--universe.server.database.Database
        |
        +--universe.server.database.DatabaseDiskbased

public class DatabaseDiskbased

extends Database

This database type is completely disk based. All objects are stored on disk using the HashStore object.

Version:

$Id: DatabaseDiskbased.java,v 1.17 2002/05/19 18:17:03 brianrater Exp $

Author:

Sean Starkey

Field Summary

private java.util.Hashtable	currentGalaxies
private java.util.Hashtable	currentPlanets
private java.util.Hashtable	currentPlayers
private java.util.Hashtable	currentSystems
private java.util.Hashtable	galaxiesToBeDeleted
private java.util.Hashtable	galaxiesToBeSaved
private com.equitysoft.hashstore.SyncDiskHashtable	GalaxyDB
private com.equitysoft.hashstore.SyncDiskHashtable	PlanetDB
private java.util.Hashtable	planetsToBeDeleted
private java.util.Hashtable	planetsToBeSaved
private com.equitysoft.hashstore.SyncDiskHashtable	PlayerDB
private java.util.Hashtable	playersToBeDeleted
private java.util.Hashtable	playersToBeSaved
private com.equitysoft.hashstore.SyncDiskHashtable	SystemDB
private java.util.Hashtable	systemsToBeDeleted
private java.util.Hashtable	systemsToBeSaved

Constructor Summary

DatabaseDiskbased(java.lang.String directory)
Constructor

Method Summary

void	delete(DBItem item) The delete method is used to remove an item from the database.
DBItem	get(Index index) The get method is used to retrieve specific data from the database.
java.util.Enumeration	query(Query query) The query method is used to retrieve a set of data elements from the database.
private Index	save_item(DBItem item)
void	save() The save method is used to store the current state of the database in permanent storage.
Index	store(DBItem item) The store method is used to change the database.

Methods inherited from class java.lang.Object

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

Field Detail

PlayerDB

private com.equitysoft.hashstore.SyncDiskHashtable PlayerDB

GalaxyDB

private com.equitysoft.hashstore.SyncDiskHashtable GalaxyDB

SystemDB

private com.equitysoft.hashstore.SyncDiskHashtable SystemDB

PlanetDB

private com.equitysoft.hashstore.SyncDiskHashtable PlanetDB

currentPlayers

private java.util.Hashtable currentPlayers

playersToBeSaved

private java.util.Hashtable playersToBeSaved

playersToBeDeleted

private java.util.Hashtable playersToBeDeleted

currentGalaxies

private java.util.Hashtable currentGalaxies

galaxiesToBeSaved

private java.util.Hashtable galaxiesToBeSaved

galaxiesToBeDeleted

private java.util.Hashtable galaxiesToBeDeleted

currentSystems

private java.util.Hashtable currentSystems

systemsToBeSaved

private java.util.Hashtable systemsToBeSaved

systemsToBeDeleted

private java.util.Hashtable systemsToBeDeleted

currentPlanets

private java.util.Hashtable currentPlanets

planetsToBeSaved

private java.util.Hashtable planetsToBeSaved

planetsToBeDeleted

private java.util.Hashtable planetsToBeDeleted

Constructor Detail

DatabaseDiskbased

public DatabaseDiskbased(java.lang.String directory)

Constructor

Parameters:

directory - Where to store the database files.

Method Detail

store

public Index store(DBItem item)

Description copied from class: Database

The store method is used to change the database. Whenever an object (DBItem) is changed, this function must be stored to commit the changes to the database.

Specified by:

store in class Database

save_item

private Index save_item(DBItem item)

get

public DBItem get(Index index)

Description copied from class: Database

The get method is used to retrieve specific data from the database. More than likely, the index used is from a query statement.

Specified by:

get in class Database

query

public java.util.Enumeration query(Query query)

Description copied from class: Database

The query method is used to retrieve a set of data elements from the database. To get specific information about an individual item, the get method should be used after the Index is found.

Specified by:

query in class Database

delete

public void delete(DBItem item)

Description copied from class: Database

The delete method is used to remove an item from the database.

Specified by:

delete in class Database

save

public void save()

Description copied from class: Database

The save method is used to store the current state of the database in permanent storage.

Specified by:

save in class Database