Uses of Class
edu.caltech.nanodb.storage.DBFile

Packages that use DBFile

Package	Description
edu.caltech.nanodb.relations	This package contains the basic data-types for representing relations in NanoDB.
edu.caltech.nanodb.storage	This package contains the classes for the Storage Manager, which is responsible for how data is stored in and retrieved from database files.
edu.caltech.nanodb.storage.heapfile	This package provides a naive implementation of the heap file organization for NanoDB.
edu.caltech.nanodb.storage.writeahead	This package contains the implementation for the write-ahead log, which allows us to provide transaction atomicity, consistency and durability.

Uses of DBFile in edu.caltech.nanodb.relations

Methods in edu.caltech.nanodb.relations that return DBFile

Modifier and Type	Method	Description
DBFile	TableInfo.getDBFile()	A helper function to simplify retrieving the table's DBFile.

Uses of DBFile in edu.caltech.nanodb.storage

Fields in edu.caltech.nanodb.storage declared as DBFile

Modifier and Type	Field	Description
(package private) DBFile	BufferManager.CachedPageInfo.dbFile
protected DBFile	DBFileReader.dbFile	The database file being read by this reader.
private DBFile	DBPage.dbFile	A reference to the database file that this page is from.
private DBFile	FileManagerImpl.lastFileAccessed	The DBFile object of the file that was accessed most recently.

Fields in edu.caltech.nanodb.storage with type parameters of type DBFile

Modifier and Type	Field	Description
private java.util.LinkedHashMap<java.lang.String,DBFile>	BufferManager.cachedFiles	This collection holds the DBFile objects corresponding to various opened files the database is currently using.

Methods in edu.caltech.nanodb.storage that return DBFile

Modifier and Type	Method	Description
DBFile	FileManager.createDBFile(java.lang.String filename, DBFileType type, int pageSize)	This method creates a new database file in the directory used by the storage manager.
DBFile	FileManagerImpl.createDBFile(java.lang.String filename, DBFileType type, int pageSize)
DBFile	StorageManager.createDBFile(java.lang.String filename, DBFileType type)
DBFile	DBFileReader.getDBFile()
DBFile	DBPage.getDBFile()	Returns the database file that this page is contained within.
DBFile	TupleFile.getDBFile()	Returns the DBFile object that this tuple file is stored in.
DBFile	BufferManager.getFile(java.lang.String filename)	Retrieves the specified DBFile from the buffer manager, if it has already been opened.
DBFile	FileManager.openDBFile(java.lang.String filename)	This method opens a database file, and reads in the file's type and page size from the first two bytes of the first page.
DBFile	FileManagerImpl.openDBFile(java.lang.String filename)
DBFile	StorageManager.openDBFile(java.lang.String filename)

Methods in edu.caltech.nanodb.storage that return types with arguments of type DBFile

Modifier and Type	Method	Description
java.util.List<DBFile>	BufferManager.removeAll()	This method removes ALL files from the cache, first flushing all pages from the cache so that any dirty pages will be saved to disk (possibly updating the write-ahead log in the process).

Methods in edu.caltech.nanodb.storage with parameters of type DBFile

Modifier and Type	Method	Description
void	BufferManager.addFile(DBFile dbFile)
void	FileManager.closeDBFile(DBFile dbFile)	Closes the underlying data file.
void	FileManagerImpl.closeDBFile(DBFile dbFile)
private void	StorageManager.closeDBFile(DBFile dbFile)
TupleFile	TupleFileManager.createTupleFile(DBFile dbFile, Schema schema)	Initialize the specified DBFile to be a new empty table with the specified schema.
void	FileManager.deleteDBFile(DBFile dbFile)	Deletes the specified database file.
void	FileManagerImpl.deleteDBFile(DBFile dbFile)
void	BufferManager.flushDBFile(DBFile dbFile)	This method removes all cached pages in the specified file from the buffer manager, writing out any dirty pages in the process.
DBPage	BufferManager.getPage(DBFile dbFile, int pageNo, boolean create)	Retrieves the specified DBPage from the Buffer Manager if it's currently buffered, or null if the page is not currently buffered.
private long	FileManagerImpl.getPageStart(DBFile dbFile, int pageNo)	This helper function calculates the file-position of the specified page.
boolean	DBPage.isFromDBFile(DBFile databaseFile)	Returns true if this page is from the specified database file.
DBPage	StorageManager.loadDBPage(DBFile dbFile, int pageNo)	This method returns a database page to use, retrieving it from the buffer manager if it is already loaded, or reading it from the specified data file if it is not already loaded.
DBPage	StorageManager.loadDBPage(DBFile dbFile, int pageNo, boolean create)	This method returns a database page to use, retrieving it from the buffer manager if it is already loaded, or reading it from the specified data file if it is not already loaded.
boolean	FileManager.loadPage(DBFile dbFile, int pageNo, byte[] buffer)	Loads a page from the underlying data file, and returns a new DBPage object containing the data.
boolean	FileManager.loadPage(DBFile dbFile, int pageNo, byte[] buffer, boolean create)	Loads a page from the underlying data file, and returns a new DBPage object containing the data.
boolean	FileManagerImpl.loadPage(DBFile dbFile, int pageNo, byte[] buffer)
boolean	FileManagerImpl.loadPage(DBFile dbFile, int pageNo, byte[] buffer, boolean create)
TupleFile	TupleFileManager.openTupleFile(DBFile dbFile)	Open the specified DBFile as a TupleFile of a specific type, containing tuples of data conforming to a specific schema.
void	BufferManager.removeDBFile(DBFile dbFile)	This method removes a file from the cache, first flushing all pages from the file out of the cache.
boolean	FileManager.renameDBFile(DBFile dbFile, java.lang.String newFilename)	Attempts to rename the specified DBFile to a new filename.
boolean	FileManagerImpl.renameDBFile(DBFile dbFile, java.lang.String newFilename)
void	FileManager.savePage(DBFile dbFile, int pageNo, byte[] buffer)	Saves a page to the DB file, and then clears the page's dirty flag.
void	FileManagerImpl.savePage(DBFile dbFile, int pageNo, byte[] buffer)
void	FileManager.syncDBFile(DBFile dbFile)	This method ensures that all file-writes on the specified DB-file have actually been synchronized to the disk.
void	FileManagerImpl.syncDBFile(DBFile dbFile)
private void	FileManagerImpl.updateFileIOPerfStats(DBFile dbFile, int pageNo, boolean read, int bufSize)
void	BufferManager.writeDBFile(DBFile dbFile, boolean sync)	This method writes all dirty pages in the specified file, optionally syncing the file after performing the write.
void	BufferManager.writeDBFile(DBFile dbFile, int minPageNo, int maxPageNo, boolean sync)	This method writes all dirty pages in the specified file, optionally syncing the file after performing the write.

Constructors in edu.caltech.nanodb.storage with parameters of type DBFile

Constructor	Description
CachedPageInfo(DBFile dbFile, int pageNo)
DBFileReader(DBFile dbFile, StorageManager storageManager)
DBFileWriter(DBFile dbFile, StorageManager storageManager)
DBPage(BufferManager bufferManager, DBFile dbFile, int pageNo)	Constructs a new, empty table-page for the specified table file.

Uses of DBFile in edu.caltech.nanodb.storage.heapfile

Fields in edu.caltech.nanodb.storage.heapfile declared as DBFile

Modifier and Type	Field	Description
private DBFile	HeapTupleFile.dbFile	The file that stores the tuples.

Methods in edu.caltech.nanodb.storage.heapfile that return DBFile

Modifier and Type	Method	Description
DBFile	HeapTupleFile.getDBFile()

Methods in edu.caltech.nanodb.storage.heapfile with parameters of type DBFile

Modifier and Type	Method	Description
TupleFile	HeapTupleFileManager.createTupleFile(DBFile dbFile, Schema schema)
TupleFile	HeapTupleFileManager.openTupleFile(DBFile dbFile)

Constructors in edu.caltech.nanodb.storage.heapfile with parameters of type DBFile

Constructor	Description
HeapTupleFile(StorageManager storageManager, HeapTupleFileManager heapFileManager, DBFile dbFile, Schema schema, TableStats stats)

Uses of DBFile in edu.caltech.nanodb.storage.writeahead

Methods in edu.caltech.nanodb.storage.writeahead that return DBFile

Modifier and Type	Method	Description
private DBFile	WALManager.createWALFile(int fileNo)	This helper method creates a brand new write-ahead log file using the Storage Manager, generating a suitable filename and passing the appropriate arguments to the Storage Manager.
private DBFile	WALManager.openWALFile(int fileNo)	This helper method opens an existing write-ahead log file using the Storage Manager, generating a suitable filename and passing the appropriate arguments to the Storage Manager.