org.vanilladb.core.storage.tx

Class Transaction

java.lang.Object

org.vanilladb.core.storage.tx.Transaction

public class Transaction
extends Object

Provides transaction management for clients, ensuring that all transactions are recoverable, and in general satisfy the ACID properties with specified isolation level.

Constructor Summary

Constructors

Constructor and Description
Transaction(TransactionMgr txMgr, TransactionLifecycleListener concurMgr, TransactionLifecycleListener recoveryMgr, TransactionLifecycleListener bufferMgr, boolean readOnly, long txNum) Creates a new transaction and associates it with a recovery manager, a concurrency manager, and a buffer manager.

Method Summary

Modifier and Type	Method and Description
void	addLifecycleListener(TransactionLifecycleListener listener)
BufferMgr	bufferMgr()
void	commit() Commits the current transaction.
ConcurrencyMgr	concurrencyMgr()
void	endStatement() Finishes the current statement.
long	getTransactionNumber()
boolean	isReadOnly()
RecoveryMgr	recoveryMgr()
void	rollback() Rolls back the current transaction.

Methods inherited from class java.lang.Object

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

Constructor Detail

Transaction

public Transaction(TransactionMgr txMgr,
                   TransactionLifecycleListener concurMgr,
                   TransactionLifecycleListener recoveryMgr,
                   TransactionLifecycleListener bufferMgr,
                   boolean readOnly,
                   long txNum)

Creates a new transaction and associates it with a recovery manager, a concurrency manager, and a buffer manager. This constructor depends on the file, log, and buffer managers from VanillaDb, which are created during system initialization. Thus this constructor cannot be called until VanillaDb.init(String) is called first.

Parameters:

txMgr - the transaction manager

concurMgr - the associated concurrency manager

recoveryMgr - the associated recovery manager

bufferMgr - the associated buffer manager

readOnly - is read-only mode

txNum - the number of the transaction

Method Detail

addLifecycleListener

public void addLifecycleListener(TransactionLifecycleListener listener)

commit

public void commit()

Commits the current transaction. Flushes all modified blocks (and their log records), writes and flushes a commit record to the log, releases all locks, and unpins any pinned blocks.

rollback

public void rollback()

Rolls back the current transaction. Undoes any modified values, flushes those blocks, writes and flushes a rollback record to the log, releases all locks, and unpins any pinned blocks.

endStatement

public void endStatement()

Finishes the current statement. Releases slocks obtained so far for repeatable read isolation level and does nothing in serializable isolation level. This method should be called after each SQL statement.

getTransactionNumber

public long getTransactionNumber()

isReadOnly

public boolean isReadOnly()

recoveryMgr

public RecoveryMgr recoveryMgr()

concurrencyMgr

public ConcurrencyMgr concurrencyMgr()

bufferMgr

public BufferMgr bufferMgr()