From 26e36b3a9d7b49d46ecfa69b447482251acba8ac Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Wed, 24 Jan 2024 16:53:38 +0300
Subject: Turn libodb repository into package for muti-package repository

---
 libodb/odb/cache-traits.hxx | 182 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100644 libodb/odb/cache-traits.hxx

(limited to 'libodb/odb/cache-traits.hxx')

diff --git a/libodb/odb/cache-traits.hxx b/libodb/odb/cache-traits.hxx
new file mode 100644
index 0000000..a8cf750
--- /dev/null
+++ b/libodb/odb/cache-traits.hxx
@@ -0,0 +1,182 @@
+// file      : odb/cache-traits.hxx
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_CACHE_TRAITS_HXX
+#define ODB_CACHE_TRAITS_HXX
+
+#include <odb/pre.hxx>
+
+#include <odb/traits.hxx>
+#include <odb/forward.hxx>
+#include <odb/session.hxx>
+#include <odb/pointer-traits.hxx>
+#include <odb/no-op-cache-traits.hxx>
+
+namespace odb
+{
+  // pointer_cache_traits
+  //
+  // Caching traits for objects passed by pointer. P should be the canonical
+  // pointer (non-const).
+  //
+  template <typename P, typename S, pointer_kind pk>
+  struct pointer_cache_traits_impl
+  {
+    typedef P pointer_type;
+    typedef S session_type;
+    typedef odb::pointer_traits<pointer_type> pointer_traits;
+    typedef typename pointer_traits::element_type object_type;
+    typedef typename object_traits<object_type>::id_type id_type;
+    typedef typename session_type::template cache_position<object_type>
+    position_type;
+
+    struct insert_guard
+    {
+      insert_guard () {}
+      insert_guard (const position_type& pos): pos_ (pos) {}
+      ~insert_guard () {session_type::_cache_erase (pos_);}
+
+      const position_type&
+      position () const {return pos_;}
+
+      void
+      release () {pos_ = position_type ();}
+
+      // Note: doesn't call erase() on the old position (assumes empty).
+      //
+      void
+      reset (const position_type& pos) {pos_ = pos;}
+
+    private:
+      position_type pos_;
+    };
+
+    // Cache management.
+    //
+    // We need the insert() overload with explicit id to handle self-
+    // references. In such cases the object is not yet loaded and the
+    // id member does not contain the correct id.
+    //
+    // Qualify the database type to resolve a phony ambiguity in VC 10.
+    //
+    static position_type
+    insert (odb::database& db, const id_type& id, const pointer_type& p)
+    {
+      return session_type::template _cache_insert<object_type> (db, id, p);
+    }
+
+    static position_type
+    insert (odb::database& db, const pointer_type& p)
+    {
+      const id_type& id (
+        object_traits<object_type>::id (
+          pointer_traits::get_ref (p)));
+
+      return session_type::template _cache_insert<object_type> (db, id, p);
+    }
+
+    static pointer_type
+    find (odb::database& db, const id_type& id)
+    {
+      return session_type::template _cache_find<object_type> (db, id);
+    }
+
+    static void
+    erase (const position_type& p)
+    {
+      session_type::template _cache_erase<object_type> (p);
+    }
+
+    // Notifications.
+    //
+    static void
+    persist (const position_type& p)
+    {
+      session_type::template _cache_persist<object_type> (p);
+    }
+
+    static void
+    load (const position_type& p)
+    {
+      session_type::template _cache_load<object_type> (p);
+    }
+
+    static void
+    update (odb::database& db, const object_type& obj)
+    {
+      session_type::template _cache_update<object_type> (db, obj);
+    }
+
+    static void
+    erase (odb::database& db, const id_type& id)
+    {
+      session_type::template _cache_erase<object_type> (db, id);
+    }
+  };
+
+  // Unique pointers don't work with the object cache.
+  //
+  template <typename P, typename S>
+  struct pointer_cache_traits_impl<P, S, pk_unique>:
+    no_op_pointer_cache_traits<P> {};
+
+  template <typename P, typename S>
+  struct pointer_cache_traits:
+    pointer_cache_traits_impl<P, S, pointer_traits<P>::kind> {};
+
+  // reference_cache_traits
+  //
+  // Caching traits for objects passed by reference. T should be the
+  // canonical object type (non-const). Only if the object pointer
+  // kind is raw do we add the object to the session.
+  //
+  template <typename T, typename S, pointer_kind pk>
+  struct reference_cache_traits_impl: no_op_reference_cache_traits<T> {};
+
+  template <typename T, typename S>
+  struct reference_cache_traits_impl<T, S, pk_raw>
+  {
+    typedef T object_type;
+    typedef typename object_traits<object_type>::pointer_type pointer_type;
+    typedef typename object_traits<object_type>::id_type id_type;
+
+    typedef pointer_cache_traits<pointer_type, S> pointer_traits;
+    typedef typename pointer_traits::position_type position_type;
+    typedef typename pointer_traits::insert_guard insert_guard;
+
+    static position_type
+    insert (odb::database& db, const id_type& id, object_type& obj)
+    {
+      pointer_type p (&obj);
+      return pointer_traits::insert (db, id, p);
+    }
+
+    static position_type
+    insert (odb::database& db, object_type& obj)
+    {
+      pointer_type p (&obj);
+      return pointer_traits::insert (db, p);
+    }
+
+    static void
+    persist (const position_type& p)
+    {
+      pointer_traits::persist (p);
+    }
+
+    static void
+    load (const position_type& p)
+    {
+      pointer_traits::load (p);
+    }
+  };
+
+  template <typename T, typename S>
+  struct reference_cache_traits:
+    reference_cache_traits_impl<
+      T, S, pointer_traits<typename object_traits<T>::pointer_type>::kind> {};
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_CACHE_TRAITS_HXX
-- 
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