Add lazy pointer support

Built-in support is provided for raw, auto, and tr1 shared/weak pointers.
New test: common/lazy-ptr.

1 files changed, 341 insertions, 0 deletions

diff --git a/common/lazy-ptr/driver.cxx b/common/lazy-ptr/driver.cxx
new file mode 100644
index 0000000..eceb515
--- /dev/null
+++ b/common/lazy-ptr/driver.cxx
@@ -0,0 +1,341 @@
+// file      : common/lazy-ptr/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+// Test lazy object pointers.
+//
+
+#include <memory>   // std::auto_ptr
+#include <cassert>
+#include <iostream>
+
+#include <odb/database.hxx>
+#include <odb/transaction.hxx>
+
+#include <common/common.hxx>
+
+#include "test.hxx"
+#include "test-odb.hxx"
+
+using namespace std;
+using namespace odb;
+
+auto_ptr<obj2>
+create (unsigned int id)
+{
+  auto_ptr<obj2> r (new obj2 (id));
+  return r;
+}
+
+lazy_auto_ptr<obj2>
+create (database& db, unsigned int id)
+{
+  lazy_auto_ptr<obj2> r (db, id);
+  return r;
+}
+
+int
+main (int argc, char* argv[])
+{
+  try
+  {
+    auto_ptr<database> db (create_database (argc, argv));
+
+    // Naked.
+    //
+    {
+      typedef cont1 cont;
+      typedef obj1 obj;
+
+      // persist
+      //
+      obj* o1 (new obj (1));
+
+      {
+        transaction t (db->begin ());
+        db->persist (o1);
+        t.commit ();
+      }
+
+      auto_ptr<cont> c1 (new cont (1));
+      auto_ptr<cont> c2 (new cont (2));
+
+      lazy_ptr<obj> lo1 (*db, 1);
+      obj* o2 (new obj (2));
+
+      obj* o3 (new obj (3));
+      obj* o4 (new obj (4));
+
+      c1->o.push_back (lo1);
+      c1->o.push_back (o2);
+      c2->o.push_back (o3);
+      c2->o.push_back (o4);
+
+      // Test pointer comparison.
+      //
+      assert (lazy_ptr<obj> () == lazy_ptr<obj> ());
+      assert (lazy_ptr<obj> (o1) != lazy_ptr<obj> ());
+      assert (lo1 != lazy_ptr<obj> ());
+      assert (lazy_ptr<obj> (o1) == lazy_ptr<obj> (o1));
+      assert (lo1 == lazy_ptr<obj> (*db, o1));
+      assert (lo1 != lazy_ptr<obj> (*db, o2));
+
+      delete o1;
+
+      {
+        transaction t (db->begin ());
+
+        db->persist (o2);
+        db->persist (o3);
+        db->persist (o4);
+
+        db->persist (*c1);
+        db->persist (*c2);
+
+        t.commit ();
+      }
+
+      // load
+      //
+      {
+        session s;
+        transaction t (db->begin ());
+        auto_ptr<cont> c (db->load<cont> (1));
+        obj* o (db->load<obj> (1));
+
+        // Not loaded.
+        //
+        assert (c->o.size () == 2);
+        assert (!c->o[0].loaded ());
+        assert (!c->o[1].loaded ());
+
+        assert (!o->c.loaded ());
+
+        // Correct object ids.
+        //
+        assert (c->o[0].object_id<obj> () == o->id);
+        assert (o->c.object_id<cont> () == c->id);
+
+        // Load.
+        //
+        cont* lc (o->c.load ());
+        obj* lo (c->o[0].load ());
+
+        assert (lc == c.get ());
+        assert (lo == o);
+
+        // Test unload/reload.
+        //
+        o->c.unload ();
+        assert (!o->c.loaded ());
+        o->c.load ();
+        assert (o->c.loaded ());
+
+        t.commit ();
+      }
+    }
+
+    // Auto pointer.
+    //
+    {
+      typedef cont2 cont;
+      typedef obj2 obj;
+
+      // persist
+      //
+      {
+        auto_ptr<obj> o1 (new obj (1));
+        transaction t (db->begin ());
+        db->persist (*o1);
+        t.commit ();
+      }
+
+      auto_ptr<cont> c1 (new cont (1));
+      auto_ptr<cont> c2 (new cont (2));
+
+      lazy_auto_ptr<obj> lo1 = create (*db, 1);
+      lo1 = create (*db, 1);
+
+      c1->o = lo1;
+      c2->o = create (2);
+
+      {
+        transaction t (db->begin ());
+
+        db->persist (*c2->o);
+
+        db->persist (*c1);
+        db->persist (*c2);
+
+        t.commit ();
+      }
+
+      // load
+      //
+      {
+        session s;
+        transaction t (db->begin ());
+        auto_ptr<cont> c (db->load<cont> (1));
+        obj* o (db->load<obj> (1));
+
+        // Not loaded.
+        //
+        assert (!c->o.loaded ());
+        assert (!o->c.loaded ());
+
+        // Correct object ids.
+        //
+        assert (c->o.object_id<obj> () == o->id);
+        assert (o->c.object_id<cont> () == c->id);
+
+        // Load.
+        //
+        cont* lc (o->c.load ());
+        const auto_ptr<obj>& lo (c->o.load ());
+
+        assert (lc == c.get ());
+        assert (lo.get () == o);
+
+        t.commit ();
+      }
+
+      // unload/reload
+      //
+      {
+        // No session.
+        transaction t (db->begin ());
+        auto_ptr<cont> c (db->load<cont> (1));
+
+        assert (!c->o.loaded ());
+        c->o.load ();
+        assert (c->o.loaded ());
+        c->o.unload ();
+        assert (!c->o.loaded ());
+        c->o.load ();
+        assert (c->o.loaded ());
+
+        t.commit ();
+      }
+
+    }
+
+    // TR1.
+    //
+#ifdef HAVE_TR1_MEMORY
+    {
+      using namespace ::tr1;
+
+      // persist
+      //
+      shared_ptr<cont> c1 (new cont (1));
+
+      {
+        transaction t (db->begin ());
+        db->persist (c1);
+        t.commit ();
+      }
+
+      lazy_shared_ptr<cont> lc1 (*db, 1);
+      shared_ptr<cont> c2 (new cont (2));
+
+      shared_ptr<obj> o1 (new obj (1));
+      shared_ptr<obj> o2 (new obj (2));
+
+      shared_ptr<obj> o3 (new obj (3));
+      shared_ptr<obj> o4 (new obj (4));
+
+      o1->c = lc1;
+      o2->c = lc1;
+      o3->c = c2;
+      o4->c = c2;
+
+      // Test pointer comparison.
+      //
+      assert (lazy_shared_ptr<cont> () == lazy_shared_ptr<cont> ());
+      assert (lazy_shared_ptr<cont> (c1) != lazy_shared_ptr<cont> ());
+      assert (lc1 != lazy_shared_ptr<cont> ());
+      assert (lazy_shared_ptr<cont> (c1) == lazy_shared_ptr<cont> (c1));
+      assert (lc1 == lazy_shared_ptr<cont> (*db, c1));
+      assert (lc1 != lazy_shared_ptr<cont> (*db, c2));
+
+      {
+        transaction t (db->begin ());
+
+        db->persist (o1);
+        db->persist (o2);
+        db->persist (o3);
+        db->persist (o4);
+
+        db->persist (c2);
+
+        t.commit ();
+      }
+
+      // load
+      //
+      {
+        session s;
+        transaction t (db->begin ());
+        shared_ptr<cont> c (db->load<cont> (1));
+        shared_ptr<obj> o (db->load<obj> (1));
+
+        // Not loaded.
+        //
+        assert (c->o.size () == 2);
+        assert (!c->o[0].loaded ());
+        assert (!c->o[1].loaded ());
+
+        assert (!o->c.loaded ());
+
+        // Correct object ids.
+        //
+        assert (c->o[0].object_id<obj> () == o->id);
+        assert (o->c.object_id<cont> () == c->id);
+
+        // Load.
+        //
+        shared_ptr<cont> lc (o->c.load ());
+        shared_ptr<obj> lo (c->o[0].load ());
+
+        assert (lc == c);
+        assert (lo == o);
+
+        t.commit ();
+      }
+
+      // Test lazy weak locking and reloading.
+      //
+      {
+        // No session.
+        transaction t (db->begin ());
+        shared_ptr<cont> c (db->load<cont> (1));
+
+        // Lock.
+        //
+        assert (!c->o[1].loaded ());
+        lazy_shared_ptr<obj> l (c->o[1].lock ());
+        assert (!l.loaded ());
+        assert (l.object_id<obj> () == c->o[1].object_id<obj> ());
+
+        // Reload.
+        //
+        assert (!c->o[1].loaded ());
+        shared_ptr<obj> lo (c->o[1].load ());
+        assert (c->o[1].loaded ());
+        lo.reset ();
+        assert (!c->o[1].loaded ());
+        lo = c->o[1].load ();
+        assert (c->o[1].loaded ());
+
+        t.commit ();
+      }
+    }
+#endif
+  }
+  catch (const odb::exception& e)
+  {
+    cerr << e.what () << endl;
+    return 1;
+  }
+}