Assets: add global `bke::AssetLibraryService` class

Add `blender::bke::AssetLibraryService` class that acts like a
blendfile-scoped singleton. It's allocated upon the first call to
`BKE_asset_library_load` and destroyed in the LOAD-PRE handler.

The `AssetLibraryService` ensures that edits to asset catalogs are not
lost when the asset browser editor closes (or even reloads). Instead,
the `AssetLibrary` pointers it owns are kept around as long as the blend
file is open.

Reviewed By: Severin

Maniphest Tasks: T92151

Differential Revision: https://developer.blender.org/D12885

1 files changed, 101 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/asset_library_service_test.cc b/source/blender/blenkernel/intern/asset_library_service_test.cc
new file mode 100644
index 00000000000..6acbe193eb7
--- /dev/null
+++ b/source/blender/blenkernel/intern/asset_library_service_test.cc
@@ -0,0 +1,101 @@
+/*
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation
+ * All rights reserved.
+ */
+
+#include "asset_library_service.hh"
+
+#include "CLG_log.h"
+
+#include "testing/testing.h"
+
+namespace blender::bke::tests {
+
+class AssetLibraryServiceTest : public testing::Test {
+ public:
+  CatalogFilePath asset_library_root_;
+
+  static void SetUpTestSuite()
+  {
+    CLG_init();
+  }
+  static void TearDownTestSuite()
+  {
+    CLG_exit();
+  }
+
+  void SetUp() override
+  {
+    const std::string test_files_dir = blender::tests::flags_test_asset_dir();
+    if (test_files_dir.empty()) {
+      FAIL();
+    }
+    asset_library_root_ = test_files_dir + "/" + "asset_library";
+  }
+
+  void TearDown() override
+  {
+    AssetLibraryService::destroy();
+  }
+};
+
+TEST_F(AssetLibraryServiceTest, get_destroy)
+{
+  AssetLibraryService *const service = AssetLibraryService::get();
+  EXPECT_EQ(service, AssetLibraryService::get())
+      << "Calling twice without destroying in between should return the same instance.";
+
+  AssetLibraryService::destroy();
+  EXPECT_NE(service, AssetLibraryService::get())
+      << "Calling twice with destroying in between should return a new instance.";
+
+  /* This should not crash. */
+  AssetLibraryService::destroy();
+  AssetLibraryService::destroy();
+}
+
+TEST_F(AssetLibraryServiceTest, library_pointers)
+{
+  AssetLibraryService *service = AssetLibraryService::get();
+  AssetLibrary *const lib = service->get_asset_library_on_disk(asset_library_root_);
+  AssetLibrary *const curfile_lib = service->get_asset_library_current_file();
+
+  EXPECT_EQ(lib, service->get_asset_library_on_disk(asset_library_root_))
+      << "Calling twice without destroying in between should return the same instance.";
+  EXPECT_EQ(curfile_lib, service->get_asset_library_current_file())
+      << "Calling twice without destroying in between should return the same instance.";
+
+  AssetLibraryService::destroy();
+  service = AssetLibraryService::get();
+  EXPECT_NE(lib, service->get_asset_library_on_disk(asset_library_root_))
+      << "Calling twice with destroying in between should return a new instance.";
+  EXPECT_NE(curfile_lib, service->get_asset_library_current_file())
+      << "Calling twice with destroying in between should return a new instance.";
+}
+
+TEST_F(AssetLibraryServiceTest, catalogs_loaded)
+{
+  AssetLibraryService *const service = AssetLibraryService::get();
+  AssetLibrary *const lib = service->get_asset_library_on_disk(asset_library_root_);
+  AssetCatalogService *const cat_service = lib->catalog_service.get();
+
+  const bUUID UUID_POSES_ELLIE("df60e1f6-2259-475b-93d9-69a1b4a8db78");
+  EXPECT_NE(nullptr, cat_service->find_catalog(UUID_POSES_ELLIE))
+      << "Catalogs should be loaded after getting an asset library from disk.";
+}
+
+}  // namespace blender::bke::tests