Uses of Class
edu.caltech.nanodb.storage.writeahead.LogSequenceNumber

Packages that use LogSequenceNumber

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.
edu.caltech.nanodb.transactions	This package contains classes for managing transactions at the logical level, such as concurrency control and isolation, deadlock detection and aborting transactions.

Uses of LogSequenceNumber in edu.caltech.nanodb.storage

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

Modifier and Type	Field	Description
private LogSequenceNumber	DBPage.pageLSN	For dirty pages, this field is set to the Log Sequence Number of the write-ahead log record corresponding to the most recent write to the page.

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

Modifier and Type	Method	Description
LogSequenceNumber	DBPage.getPageLSN()

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

Modifier and Type	Method	Description
void	DBPage.setPageLSN(LogSequenceNumber lsn)

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

Fields in edu.caltech.nanodb.storage.writeahead declared as LogSequenceNumber

Modifier and Type	Field	Description
LogSequenceNumber	RecoveryInfo.firstLSN	This is the log sequence number to start recovery processing from.
private LogSequenceNumber	WALManager.firstLSN	This object holds the log sequence number of the first write-ahead log record where recovery would need to start from.
LogSequenceNumber	RecoveryInfo.nextLSN	This is the "next LSN", one past the last valid log sequence number found in the write-ahead logs.
private LogSequenceNumber	WALManager.nextLSN	This object holds the log sequence number where the next write-ahead log record will be written.

Fields in edu.caltech.nanodb.storage.writeahead with type parameters of type LogSequenceNumber

Modifier and Type	Field	Description
java.util.HashMap<java.lang.Integer,LogSequenceNumber>	RecoveryInfo.incompleteTxns	This is the set of incomplete transactions found during recovery processing, along with the last log sequence number seen for each transaction.

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

Modifier and Type	Method	Description
LogSequenceNumber	LogSequenceNumber.clone()
static LogSequenceNumber	WALManager.computeNextLSN(int fileNo, int fileOffset)	This static helper function takes the file number of a WAL file, and the offset in the WAL file where the next write-ahead log record would go if the WAL file can hold more data, and then creates a new LogSequenceNumber object, wrapping to the next file if necessary.
LogSequenceNumber	WALManager.getFirstLSN()
LogSequenceNumber	RecoveryInfo.getLastLSN(int transactionID)	This helper method returns the last log sequence number seen for the specified transaction.
LogSequenceNumber	WALManager.getNextLSN()
private LogSequenceNumber	WALManager.writeRedoOnlyUpdatePageRecord(int transactionID, LogSequenceNumber prevLSN, DBPage dbPage, int numSegments, byte[] changes)	This method writes a redo-only update-page record to the write-ahead log, including only redo details.
private LogSequenceNumber	WALManager.writeRedoOnlyUpdatePageRecord(DBPage dbPage, int numSegments, byte[] changes)	This method writes a redo-only update-page record to the write-ahead log, including only redo details.
LogSequenceNumber	WALManager.writeTxnRecord(WALRecordType type)	This function writes a transaction demarcation record (WALRecordType.START_TXN, WALRecordType.COMMIT_TXN, or WALRecordType.ABORT_TXN) to the write-ahead log.
private LogSequenceNumber	WALManager.writeTxnRecord(WALRecordType type, int transactionID, LogSequenceNumber prevLSN)	This function writes a transaction demarcation record (WALRecordType.START_TXN, WALRecordType.COMMIT_TXN, or WALRecordType.ABORT_TXN) to the write-ahead log.

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

Modifier and Type	Method	Description
int	LogSequenceNumber.compareTo(LogSequenceNumber lsn)
RecoveryInfo	WALManager.doRecovery(LogSequenceNumber storedFirstLSN, LogSequenceNumber storedNextLSN)	Performs recovery processing starting at the specified log sequence number, and returns the LSN where the next recovery process should start from.
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.
private DBFileWriter	WALManager.getWALFileWriter(LogSequenceNumber lsn)	This method opens the WAL file specified in the passed-in Log Sequence Number, wraps it with a DBFileWriter so that it can be read and written, and then seeks to the specified file offset.
void	RecoveryInfo.updateInfo(int transactionID, LogSequenceNumber lsn)	This helper method updates the recovery information with the specified transaction ID and log sequence number.
private LogSequenceNumber	WALManager.writeRedoOnlyUpdatePageRecord(int transactionID, LogSequenceNumber prevLSN, DBPage dbPage, int numSegments, byte[] changes)	This method writes a redo-only update-page record to the write-ahead log, including only redo details.
private LogSequenceNumber	WALManager.writeTxnRecord(WALRecordType type, int transactionID, LogSequenceNumber prevLSN)	This function writes a transaction demarcation record (WALRecordType.START_TXN, WALRecordType.COMMIT_TXN, or WALRecordType.ABORT_TXN) to the write-ahead log.

Constructors in edu.caltech.nanodb.storage.writeahead with parameters of type LogSequenceNumber

Constructor	Description
LogSequenceNumber(LogSequenceNumber lsn, int recordSize)
RecoveryInfo(LogSequenceNumber firstLSN, LogSequenceNumber nextLSN)

Uses of LogSequenceNumber in edu.caltech.nanodb.transactions

Fields in edu.caltech.nanodb.transactions declared as LogSequenceNumber

Modifier and Type	Field	Description
private LogSequenceNumber	TransactionState.lastLSN
private LogSequenceNumber	TransactionManager.txnStateNextLSN	This is the last value of nextLSN saved to the transaction-state file.

Methods in edu.caltech.nanodb.transactions that return LogSequenceNumber

Modifier and Type	Method	Description
LogSequenceNumber	TransactionStatePage.getFirstLSN()
LogSequenceNumber	TransactionState.getLastLSN()
LogSequenceNumber	TransactionStatePage.getNextLSN()

Methods in edu.caltech.nanodb.transactions with parameters of type LogSequenceNumber

Modifier and Type	Method	Description
void	TransactionManager.forceWAL(LogSequenceNumber lsn)	This method forces the write-ahead log out to at least the specified log sequence number, syncing the log to ensure that all essential records have reached the disk itself.
void	TransactionStatePage.setFirstLSN(LogSequenceNumber firstLSN)
void	TransactionState.setLastLSN(LogSequenceNumber lsn)
void	TransactionStatePage.setNextLSN(LogSequenceNumber nextLSN)