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// file : odb/session.hxx
// author : Boris Kolpackov <boris@codesynthesis.com>
// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_SESSION_HXX
#define ODB_SESSION_HXX
#include <map>
#include <typeinfo>
#include <odb/forward.hxx>
#include <odb/traits.hxx>
namespace odb
{
class session
{
public:
session ();
~session ()
{
reset_current ();
}
private:
session (const session&);
session& operator= (const session&);
public:
template <typename T, template <typename> class P>
typename object_traits<T>::id_type
persist (database&, P<T> obj);
template <typename T>
typename object_traits<T>::shared_ptr
find (database&, typename object_traits<T>::id_type const&);
template <typename T, template <typename> class P>
void
erase (database&, P<T> obj);
template <typename T, template <typename> class P>
void
modified (P<T> obj);
void
flush ();
public:
// Return true if there is a session in effect.
//
static bool
has_current ();
// Get current thread's session. Throw if no session in effect.
//
static session&
current ();
// Set current thread's session.
//
static void
current (session&);
// Revert to the no session in effect state.
//
static void
reset_current ();
private:
struct object_proxy;
typedef std::map< void*, shared_ptr<object_proxy> > object_map;
struct type_map
{
virtual
~type_map () = 0;
};
template <typename T>
struct type_map_impl:
type_map,
std::map<typename object_traits<T>::id_type, object_map::iterator>
{
};
struct type_info_comparator
{
bool
operator() (const std::type_info* x, const std::type_info* y) const
{
// XL C++ on AIX has buggy type_info::before() in that
// it returns true for two different type_info objects
// that happened to be for the same type.
//
#if defined(__xlC__) && defined(_AIX)
return *x != *y && x->before (*y);
#else
return x->before (*y);
#endif
}
};
typedef
std::map<const std::type_info*, shared_ptr<type_map>, type_info_comparator>
id_map;
//
//
struct object_proxy
{
virtual
~object_proxy () = 0;
object_proxy (database& db, id_source is)
: id_source_ (is), db_ (db)
{
}
enum state
{
transient, /* Persisted out of transaction. */
clean,
dirty, /* To be updated on flush. */
erased /* To be deleted on flush. */
};
public:
virtual void
persist () = 0;
virtual void
update () = 0;
virtual void
erase () = 0;
virtual void
register_id (id_map&, object_map::iterator) = 0;
virtual void
unregister_id (id_map&) = 0;
public:
state state_;
id_source id_source_;
database& db_;
};
template <typename T>
struct object_proxy_impl: object_proxy
{
typedef object_traits<T> traits;
typedef typename traits::shared_ptr obj_ptr;
typedef typename traits::shared_ops ptr_ops;
object_proxy_impl (database& db, obj_ptr obj)
: object_proxy (db, traits::id_source), obj_ (obj)
{
}
public:
virtual void
persist ();
virtual void
update ();
virtual void
erase ();
virtual void
register_id (id_map&, object_map::iterator);
virtual void
unregister_id (id_map&);
public:
obj_ptr obj_;
};
object_map object_map_;
id_map id_map_;
};
}
#include <odb/session.txx>
#endif // ODB_SESSION_HXX
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