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

Packages that use DBFileReader

Package	Description
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.writeahead	This package contains the implementation for the write-ahead log, which allows us to provide transaction atomicity, consistency and durability.

Uses of DBFileReader in edu.caltech.nanodb.storage

Subclasses of DBFileReader in edu.caltech.nanodb.storage

Modifier and Type	Class	Description
class	DBFileWriter	A subclass of DBFileReader, this class provides the basic ability to read and write a DBFile as a single sequential file, obscuring the fact that it is actually broken into pages.

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

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

Modifier and Type	Method	Description
private DBFileReader	WALManager.getWALFileReader(LogSequenceNumber lsn, DBFileReader reader)	This method opens the WAL file specified in the passed-in Log Sequence Number, wraps it with a DBFileReader so that it can be read from, and then seeks to the specified file offset.

Methods in edu.caltech.nanodb.storage.writeahead with parameters of type DBFileReader

Modifier and Type	Method	Description
private void	WALManager.applyRedo(WALRecordType type, DBFileReader walReader, DBPage dbPage, int numSegments)	This helper function writes a sequence of redo-segments from an WALRecordType.UPDATE_PAGE or WALRecordType.UPDATE_PAGE_REDO_ONLY record.
private byte[]	WALManager.applyUndoAndGenRedoOnlyData(DBFileReader walReader, DBPage dbPage, int numSegments)	This helper method uses a WALRecordType.UPDATE_PAGE record to undo changes to a data page, and at the same time the method generates the data that must go into a corresponding redo-only WAL record.
private DBFileReader	WALManager.getWALFileReader(LogSequenceNumber lsn, DBFileReader reader)	This method opens the WAL file specified in the passed-in Log Sequence Number, wraps it with a DBFileReader so that it can be read from, and then seeks to the specified file offset.