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/*
* This file is part of rasdaman community.
*
* Rasdaman community is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rasdaman community is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with rasdaman community. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
rasdaman GmbH.
*
* For more information please see <http://www.rasdaman.org>
* or contact Peter Baumann via <baumann@rasdaman.com>.
/
/**
* INCLUDE: transaction.hh
*
* MODULE: rasodmg
* CLASS: r_Transaction
*
* COMMENTS:
* None
*/
//@ManMemo: Module: {\bf rasodmg}
#ifndef _D_TRANSACTION_
#define _D_TRANSACTION_
#include "raslib/error.hh"
#include "raslib/oid.hh"
class r_Object;
#include "rasodmg/set.hh"
#include "rasodmg/ref.hh"
/*@Doc:
Transactions can be started, committed, aborted, and checkpointed.
It is important to note that all access, creation, modification,
and deletion of persistent objects must be done within a transaction.
Right now, only one transaction can be active at a time.
*/
/**
* \ingroup Rasodmgs
*/
class r_Transaction
{
public:
/// possible states of the transaction
enum r_TAStatus { active, inactive, comiting, aborting };
/// possible transaction modes
enum r_TAMode { read_write, read_only };
/// default constructor
r_Transaction();
/// destructor, an active transaction is aborted
~r_Transaction();
/// start the transaction
void begin( r_TAMode mode = read_write ) throw( r_Error );
/**
By default, a transaction is started in write mode. If the read_only
mode is specified, no write operations are allowed within the transaction
anymore.
If any write operation occurs in read_only mode, the exception r_Error with
kind {\tt r_Error_TransactionReadOnly} will be raised and the transaction will
be aborted.
In order to achieve maximal performance, read-only transactions should be used
whenever posssible, i.e., when no update operations occur within this transaction.
*/
/// commit transaction and make changes persistent
void commit() throw( r_Error );
/**
The transaction is committed and changes are made persistent
in the database.
While committing, the following errors can occur:
\begin{tabular}{lll}
r_Error_TransferFailed && Server communication problem.\\
r_Error_ObjectUnknown && Name of object is unknown.\\
r_Error_DatabaseClassUndefined && Type name of object not known by the database.\\
r_Error_CollectionElementTypeMismatch && Collection and MDD type mismatch.\\
\end{tabular}
*/
/// abort transaction and forget changes within transaction
void abort();
/// returns the current state
inline r_TAStatus get_status() const;
/// returns current mode
inline r_TAMode get_mode() const;
//@Man: Methods and types for internal use only:
//@{
///
/// store a pointer to the actual transaction
static r_Transaction* actual_transaction;
/// load an object (internal use only)
r_Ref_Any load_object( const r_OId& oid );
/// possible non-r_Object values maintained by the transaction
enum GenRefType { MINTERVAL, SINTERVAL, POINT, OID, SCALAR };
/// adds a non-r_Object to the list of persistent objects
void add_object_list( GenRefType type, void* ref );
///
//@}
private:
/// adds an object of type \Ref{r_Object} to the list of persistent objects
void add_object_list( const r_Ref<r_Object>& );
/// current transaction state
r_TAStatus ta_state;
/// current transaction mode (just valid if transaction is active)
r_TAMode ta_mode;
/// list of \Ref{r_Object} references which have been created within the transaction
r_Set< r_Ref<r_Object> > object_list;
// element type of non \Ref{r_Object} list maintained by the transaction
typedef struct{ GenRefType type; void* ref; } GenRefElement;
/// list of non \Ref{r_Object} references which have been created within the transaction
r_Set< GenRefElement* > non_object_list;
friend class r_Object;
};
#define DEF_TRANSACTION
#include "rasodmg/iterator.hh"
// For HP cfront compiler each template instantiation used in a library
// must be defined in an included header.
typedef r_Iterator<r_Object*> r_Iterator_r_Object_dummy;
#include "rasodmg/transaction.icc"
#ifdef EARLY_TEMPLATE
#ifdef __EXECUTABLE__
#ifdef __VISUALC__
#include "rasodmg/ref.cpp"
#else
#include "rasodmg/ref.cc"
#endif
#endif
#endif
#endif
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