LMDBAL::Transaction Class Reference

Public read only transaction. More...

Inheritance diagram for LMDBAL::Transaction:

Public Member Functions
	Transaction ()
	Constructs inactive transaction.
	Transaction (Transaction &&other)
	Moves transaction to a new object.
	Transaction (const Transaction &other)=delete
Transaction &	operator= (const Transaction &other)=delete
Transaction &	operator= (Transaction &&other)
	Move-assigns transaction to the new object.
virtual	~Transaction ()
	Destroys transaction.
void	terminate ()
	Terminates transaction if it was active.
bool	isActive () const
	Returns transaction states.

Protected Member Functions
	Transaction (TransactionID txn, const Base *parent)
	Constructs an active transaction.
void	reset ()
	Resets inner transaction properties to inactive state.
void	closeCursors ()
	Closes attached curors;.

Protected Attributes
TransactionID	txn
	Transaction inner handler.
bool	active
	Transaction state.
const Base *	parent
	Pointer to the database this transaction belongs to.
std::map< uint32_t, CursorCommon * >	cursors
	a collection of cursors curently opened under this transaction

Friends
class	Base
class	StorageCommon
class	CursorCommon

Detailed Description

Public read only transaction.

This class provides read only transactions you can use to speed to your queries keeping them thread safe. LMDBAL::Transaction is NOT COPYABLE but MOVABLE. Transaction can be in one of two states: active or terminated. The way to receive an active LMDBAL::Transaction is to call LMDBAL::Base::beginReadOnlyTransaction.

Active transactions become terminated upon the call of LMDBAL::Transaction::terminate. Active transactions automaticaly terminate themselves upon destruction.

You CAN NOT use inactive transactions for any query.

Member Function Documentation

isActive()

bool LMDBAL::Transaction::isActive

(

)

const

Returns transaction states.

Returns

true if the transaction is active, false otherwise

terminate()

void LMDBAL::Transaction::terminate

(

)

Terminates transaction if it was active.

Transaction becomes terminated after calling this method

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The documentation for this class was generated from the following files:

• /workspace/blue/lmdbal/src/transaction.h
• /workspace/blue/lmdbal/src/transaction.cpp