From 1e78bdc724e95898c04a3409b0b192aa7f77780b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 15 Oct 2012 13:17:30 +0200
Subject: Implement early connection release

---
 odb/connection.cxx | 55 +++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 46 insertions(+), 9 deletions(-)

(limited to 'odb/connection.cxx')

diff --git a/odb/connection.cxx b/odb/connection.cxx
index f479131..2686887 100644
--- a/odb/connection.cxx
+++ b/odb/connection.cxx
@@ -4,6 +4,8 @@
 
 #include <odb/database.hxx>
 #include <odb/connection.hxx>
+#include <odb/result.hxx>
+#include <odb/prepared-query.hxx>
 #include <odb/exceptions.hxx> // prepared_*
 
 using namespace std;
@@ -13,16 +15,45 @@ namespace odb
   connection::
   ~connection ()
   {
+    assert (prepared_queries_ == 0);
+    assert (prepared_map_.empty ());
+  }
+
+  void connection::
+  clear_prepared_map ()
+  {
     for (prepared_map_type::iterator i (prepared_map_.begin ()),
            e (prepared_map_.end ()); i != e; ++i)
     {
       if (i->second.params != 0)
         i->second.params_deleter (i->second.params);
     }
+
+    prepared_map_.clear ();
+  }
+
+  void connection::
+  recycle ()
+  {
+    while (prepared_queries_ != 0)
+    {
+      prepared_queries_->stmt.reset ();
+      prepared_queries_->list_remove ();
+    }
   }
 
   void connection::
-  cache_query_ (details::shared_ptr<prepared_query_impl> pq,
+  invalidate_results ()
+  {
+    while (results_ != 0)
+    {
+      results_->invalidate ();
+      results_->list_remove ();
+    }
+  }
+
+  void connection::
+  cache_query_ (prepared_query_impl* pq,
                 const type_info& ti,
                 void* params,
                 const type_info* params_info,
@@ -37,19 +68,25 @@ namespace odb
 
     prepared_entry_type& e (r.first->second);
 
-    e.prep_query = pq;
-    e.type_info = &ti;
-
-    // Mark the statement as cached.
+    // Mark this prepared query as cached , get its ref count to 1
+    // (prepared_query instances now reference this impl object),
+    // and remove it from the invalidation list.
     //
-    pq->stmt->cached (true);
+    pq->cached = true;
+
+    while (pq->_ref_count () > 1)
+      pq->_dec_ref ();
 
+    pq->list_remove ();
+
+    e.prep_query.reset (pq);
+    e.type_info = &ti;
     e.params = params;
     e.params_info = params_info;
     e.params_deleter = params_deleter;
   }
 
-  details::shared_ptr<prepared_query_impl> connection::
+  prepared_query_impl* connection::
   lookup_query_ (const char* name,
                  const type_info& ti,
                  void** params,
@@ -72,7 +109,7 @@ namespace odb
     }
 
     if (i == prepared_map_.end ())
-      return details::shared_ptr<prepared_query_impl> ();
+      return 0;
 
     // Make sure the types match.
     //
@@ -87,6 +124,6 @@ namespace odb
       *params = i->second.params;
     }
 
-    return i->second.prep_query;
+    return i->second.prep_query.get ();
   }
 }
-- 
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