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CdbTransactionBase.hh

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#ifndef CDB_TRANSACTION_BASE_HH
#define CDB_TRANSACTION_BASE_HH

// File and Version Information:
//      $Id: CdbTransactionBase.hh,v 1.1 2005/02/02 13:54:56 gapon Exp $

#include "CdbBase/CdbCommon.hh"

/// A base interface for technology specific transaction managers
/**
  * This class provides a foundation for technology-specific implementations
  * of transaction management using the "resource-acquisition-is-initialization"
  * paradigm:
  *
  * - The transaction is supposed to be started when a constructor of a subclass
  *   is invoked.
  *
  * - The transaction is commited when a destructor of the subclass is executed.
  *
  * Note, that an actual transaction mode is managed by subclasses. The current
  * interface's role is to provide a mechanizm of events when important
  * changes in the lifetime of the transaction are taking place.
  */
class CdbTransactionBase {

public:

  /// The constructor
  /**
    * The transaction starts in the constructor of the subclass.
    */
    CdbTransactionBase( ) { };
 
  /// The destructor
  /**
    * The transaction ends in the destructor of the subclass.
    */
    virtual ~CdbTransactionBase( ) { };

  /// Flush modifications made within the current transaction and keep going
  /**
    * The semantic of this operations may vary for different persistent
    * technologies and implementations.
    */
    virtual void commitAndHold( ) = 0;
};

#endif  // CDB_TRANSACTION_BASE_HH

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