simpledb

Class Database

java.lang.Object

simpledb.Database

public class Database
extends java.lang.Object

Database is a class that initializes several static variables used by the database system (the catalog, the buffer pool, and the log files, in particular.)

Provides a set of methods that can be used to access these variables from anywhere.

Field Summary

Fields

Modifier and Type	Field and Description
private BufferPool	_bufferpool
private Catalog	_catalog
private static java.util.concurrent.atomic.AtomicReference<Database>	_instance
private LogFile	_logfile
private static java.lang.String	LOGFILENAME

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Database()

Method Summary

Modifier and Type	Method and Description
static BufferPool	getBufferPool() Return the buffer pool of the static Database instance
static Catalog	getCatalog() Return the catalog of the static Database instance
static LogFile	getLogFile() Return the log file of the static Database instance
static void	reset()
static BufferPool	resetBufferPool(int pages) Method used for testing -- create a new instance of the buffer pool and return it

Methods inherited from class java.lang.Object

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

Field Detail

_instance

private static java.util.concurrent.atomic.AtomicReference<Database> _instance

_catalog

private final Catalog _catalog

_bufferpool

private final BufferPool _bufferpool

LOGFILENAME

private static final java.lang.String LOGFILENAME

See Also:

Constant Field Values

_logfile

private final LogFile _logfile

Constructor Detail

Database

private Database()

Method Detail

getLogFile

public static LogFile getLogFile()

Return the log file of the static Database instance

getBufferPool

public static BufferPool getBufferPool()

Return the buffer pool of the static Database instance

getCatalog

public static Catalog getCatalog()

Return the catalog of the static Database instance

resetBufferPool

public static BufferPool resetBufferPool(int pages)

Method used for testing -- create a new instance of the buffer pool and return it

reset

public static void reset()