The IStorageSvc interface is able to handle user request for. More...

#include <StorageSvc/IStorageSvc.h>

Inheritance diagram for pool::IStorageSvc:

Collaboration diagram for pool::IStorageSvc:

Public Member Functions
virtual unsigned int	addRef ()=0
	IInterface implementation: Reference Interface instance.
virtual unsigned int	release ()=0
	IInterface implementation: Release Interface instance.
virtual std::string	getContName (FileDescriptor &refDB, Token &pToken)=0
	Get container name for object.
virtual StatusCode	allocate (FileDescriptor &refDB, const std::string &refCont, int technology, const void object, ShapeH shapeH, Token &refpTok)=0
	Register object for write.
virtual StatusCode	read (const FileDescriptor &refDB, const Token &pToken, ShapeH shapeH, void **object)=0
	Read a persistent object from the medium.
virtual StatusCode	getShape (FileDescriptor &refDB, const Guid &objType, ShapeH &shapeH)=0
	Retrieve persistent shape from Storage manager.
virtual ShapeH	createShape (const Guid &shapeID)=0
	Create a Shape representation based on a ShapeID.
virtual StatusCode	startSession (int mode, int tech)=0
	Start a new Database Session.
virtual StatusCode	endSession ()=0
	End the Database session.
virtual StatusCode	existsConnection (const FileDescriptor &refDB)=0
	Check the existence of a logical Database unit.
virtual StatusCode	connect (int mode, FileDescriptor &refDB)=0
	Connect to a logical Database unit.
virtual StatusCode	disconnect (FileDescriptor &refDB)=0
	Disconnect from a logical Database unit.
virtual StatusCode	openMode (FileDescriptor &refDB, int &mode)=0
	Query the access mode of a Database unit.
virtual StatusCode	endTransaction (ConnectionH conn, Transaction::Action typ)=0
	End/Finish an existing Transaction sequence.
virtual StatusCode	getDomainOption (DbOption &opt)=0
	Access options for a given database domain.
virtual StatusCode	setDomainOption (const DbOption &opt)=0
	Set options for a given database domain.

Protected Member Functions
virtual	~IStorageSvc ()
	Destructor (called only by sub-classes)

Detailed Description

The IStorageSvc interface is able to handle user request for.

transient objects to become persistent and
persistent objects to be made trasient. What the storage manager however needs to perform this task are object mappings, which translate between the two representations.

The activity of the storage manager includes the Transaction handling and hence the management of

Database connections: A connection is equivalent to the triple (OCISession, OCIServer, OCISvcCtx) in ORACLE, a login to a datasource using ODBC, or a single federation for Objectivity. For file based technologies, such as root, MS Access, ODBC/Text etc., this is involves the opening of the file.
Database Transactions: Start and end a Transaction.

Author: Markus Frank

Version: 1.0

Definition at line 51 of file IStorageSvc.h.

Constructor & Destructor Documentation

◆ ~IStorageSvc()

virtual pool::IStorageSvc::~IStorageSvc ( )

inlineprotectedvirtual

Destructor (called only by sub-classes)

Definition at line 54 of file IStorageSvc.h.

54{ }

Member Function Documentation

◆ addRef()

virtual unsigned int pool::IStorageSvc::addRef ( )

pure virtual

IInterface implementation: Reference Interface instance.

Implemented in pool::DbStorageSvc.

◆ allocate()

virtual StatusCode pool::IStorageSvc::allocate	(	FileDescriptor &	refDB,
		const std::string &	refCont,
		int	technology,
		const void *	object,
		ShapeH	shapeH,
		Token *&	refpTok )

pure virtual

Register object for write.

Parameters

refDB	[IN] Reference to Database descriptor
refCont	[IN] Reference to container name
technology[IN]	Specialised sub-technology
object	[IN] Pointer to persistent data object.
shapeH	[IN] Handle to persistent type information
refpTok	[OUT] Reference to location for storing the pointer of the persistent object token.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ connect()

virtual StatusCode pool::IStorageSvc::connect	(	int	mode,
		FileDescriptor &	refDB )

pure virtual

Connect to a logical Database unit.

A connection is equivalent to the triple (OCISession, OCIServer, OCISvcCtx) in ORACLE, a login to a datasource using ODBC, or a single federation for Objectivity. For file based technologies, such as root, MS Access, ODBC/Text etc., this is involves the opening of the requested file.

Parameters

mode	[IN] Flag to indicate the accessmode of the session. READ, NEW/CREATE/WRITE, UPDATE, RECREATE.
refDB	[I/O] Descriptor of the Database to be opened. On successful return the Database handle is valid.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ createShape()

virtual ShapeH pool::IStorageSvc::createShape ( const Guid & shapeID )

pure virtual

Create a Shape representation based on a ShapeID.

Parameters

shapeID [IN] Shape identifier.

Returns: Handle to persistent mapping of a given object type.

Implemented in pool::DbStorageSvc.

◆ disconnect()

virtual StatusCode pool::IStorageSvc::disconnect ( FileDescriptor & refDB )

pure virtual

Disconnect from a logical Database unit.

The request for disconnect requires, that all pending Transactions are already commited. Otherwise data are lost. On disconnection the access to the Database is finalized, closed. The token will be invalidated may not be used at any longer after disconnection.

Parameters

refDB [IN] Descriptor of the Database access. This handle was retrieved when connecting to the logical Database. On successful return the Database handle will be invalidated.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ endSession()

virtual StatusCode pool::IStorageSvc::endSession ( )

pure virtual

End the Database session.

The request to end a Database session requires, that all pending Transactions and connections are closed. Otherwise internally the close will be forced and potentially data on pending Transactions will be lost. The token will be invalidated may not be used at any longer once the session ended.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ endTransaction()

virtual StatusCode pool::IStorageSvc::endTransaction	(	ConnectionH	conn,
		Transaction::Action	typ )

pure virtual

End/Finish an existing Transaction sequence.

At this phase all objects, which were marked for write when the Transaction was started, are either going to be made persistent or scratched. After the Transaction ended, the Transaction context is invalidated and may no longer be used independent wether the Transaction was successful or not.

Parameters

conn	[IN] Database connection
typ	[IN] Enum indicating an action to be performed. Valid arguments are COMMIT

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ existsConnection()

virtual StatusCode pool::IStorageSvc::existsConnection ( const FileDescriptor & refDB )

pure virtual

Check the existence of a logical Database unit.

Parameters

refDB [I/O] Descriptor of the Database to be opened. On successful return the Database handle is valid.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ getContName()

virtual std::string pool::IStorageSvc::getContName	(	FileDescriptor &	refDB,
		Token &	pToken )

pure virtual

Get container name for object.

Parameters

refDB	[IN] Reference to Database descriptor
pToken	[IN] Token to the persistent object.

Returns: std::string container name.

Implemented in pool::DbStorageSvc.

◆ getDomainOption()

virtual StatusCode pool::IStorageSvc::getDomainOption ( DbOption & opt )

pure virtual

Access options for a given database domain.

Domain options are global options, which refer to the database technology and not to a particular connection.

Note: The options depend on the underlying implementation and are not normalized.

Parameters

opt	[IN] Reference to option object.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ getShape()

virtual StatusCode pool::IStorageSvc::getShape	(	FileDescriptor &	refDB,
		const Guid &	objType,
		ShapeH &	shapeH )

pure virtual

Retrieve persistent shape from Storage manager.

The persistent shape is saved at write time to a Database. To match the transient shape of an object to the persistent shape of the data at the time the data were written should allow for schema evolution and object transformation(s).

Parameters

refDB	[IN] Reference to Database descriptor
objType	[IN] Shape identifier.
shapeH	[OUT] Handle to persistent mapping of a given object type.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ openMode()

virtual StatusCode pool::IStorageSvc::openMode	(	FileDescriptor &	refDB,
		int &	mode )

pure virtual

Query the access mode of a Database unit.

Parameters

refDB	[IN] Descriptor of the Database to be queried.
mode	[OUT] Open mod to the database.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ read()

virtual StatusCode pool::IStorageSvc::read	(	const FileDescriptor &	refDB,
		const Token &	pToken,
		ShapeH	shapeH,
		void **	object )

pure virtual

Read a persistent object from the medium.

Reading an object does not create the object.

Parameters

refDB	[IN] Reference to Database descriptor
pToken	[IN] Reference to persistent token information.
object	[OUT] Pointer to persistent data pointer.
shapeH	[IN] Desired object shape to be read

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ release()

virtual unsigned int pool::IStorageSvc::release ( )

pure virtual

IInterface implementation: Release Interface instance.

Implemented in pool::DbStorageSvc.

◆ setDomainOption()

virtual StatusCode pool::IStorageSvc::setDomainOption ( const DbOption & opt )

pure virtual

Set options for a given database domain.

Domain options are global options, which refer to the database technology and not to a particular connection.

Note: The options depend on the underlying implementation and are not normalized.

Parameters

opt	[IN] Reference to option object.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

◆ startSession()

virtual StatusCode pool::IStorageSvc::startSession	(	int	mode,
		int	tech )

pure virtual

Start a new Database Session.

The Database session handles Databases of one given type. This involves specific handling of a given domain represented by a technology type. All subsequent actions involving Database actions will re-use this technology identifier. The session is a purely logical concept, which typically cannot fail unless the underlying technology requires global initialization calls.

Parameters

mode	[IN] Flag to indicate the accessmode of the session. READ, NEW/CREATE/WRITE, UPDATE, RECREATE
tech	[IN] Flag indicating the technology type of the Database the user wants to connect to.

Returns: StatusCode code indicating success or failure.

Implemented in pool::DbStorageSvc.

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

IStorageSvc.h

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ ~IStorageSvc()

Member Function Documentation

◆ addRef()

◆ allocate()

◆ connect()

◆ createShape()

◆ disconnect()

◆ endSession()

◆ endTransaction()

◆ existsConnection()

◆ getContName()

◆ getDomainOption()

◆ getShape()

◆ openMode()

◆ read()

◆ release()

◆ setDomainOption()

◆ startSession()