simpledb.server
Class SimpleDB

java.lang.Object
  simpledb.server.SimpleDB

public class SimpleDB
extends Object

The class that provides system-wide static global values. These values must be initialized by the method init before use. The methods initFileMgr, initFileAndLogMgr, initFileLogAndBufferMgr, and initMetadataMgr provide limited initialization, and are useful for debugging purposes.

Author:

Edward Sciore

Field Summary

static int	BUFFER_SIZE
static String	LOG_FILE

Constructor Summary

SimpleDB()

Method Summary

static BufferMgr	bufferMgr()
static FileMgr	fileMgr()
static void	init(String dirname) Initializes the system.
static void	initFileAndLogMgr(String dirname) Initializes the file and log managers.
static void	initFileLogAndBufferMgr(String dirname) Initializes the file, log, and buffer managers.
static void	initFileMgr(String dirname) Initializes only the file manager.
static void	initMetadataMgr(boolean isnew, Transaction tx) Initializes metadata manager.
static LogMgr	logMgr()
static MetadataMgr	mdMgr()
static Planner	planner() Creates a planner for SQL commands.

Methods inherited from class java.lang.Object

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

Field Detail

BUFFER_SIZE

public static int BUFFER_SIZE

LOG_FILE

public static String LOG_FILE

Constructor Detail

SimpleDB

public SimpleDB()

Method Detail

init

public static void init(String dirname)

Initializes the system. This method is called during system startup.

Parameters:

dirname - the name of the database directory

initFileMgr

public static void initFileMgr(String dirname)

Initializes only the file manager.

Parameters:

dirname - the name of the database directory

initFileAndLogMgr

public static void initFileAndLogMgr(String dirname)

Initializes the file and log managers.

Parameters:

dirname - the name of the database directory

initFileLogAndBufferMgr

public static void initFileLogAndBufferMgr(String dirname)

Initializes the file, log, and buffer managers.

Parameters:

dirname - the name of the database directory

initMetadataMgr

public static void initMetadataMgr(boolean isnew,
                                   Transaction tx)

Initializes metadata manager.

Parameters:

isnew - an indication of whether a new database needs to be created.

tx - the transaction performing the initialization

fileMgr

public static FileMgr fileMgr()

bufferMgr

public static BufferMgr bufferMgr()

logMgr

public static LogMgr logMgr()

mdMgr

public static MetadataMgr mdMgr()

planner

public static Planner planner()

Creates a planner for SQL commands. To change how the planner works, modify this method.

Returns:

the system's planner for SQL commands