IMediaLibraryCb: Expose discover/restore related callback methods

include/IMediaLibrary.h

@@ -17,6 +17,15 @@ public:
      * @param file The updated file.
      */
     virtual void onMetadataUpdated( FilePtr file ) = 0;
+
+    virtual void onDiscoveryStarted( const std::string& entryPoint ) = 0;
+    /**
+     * @brief onFileAdded This will be called for each new file discovered
+     *                    or restored when reloading the media library.
+     * @param file
+     */
+    virtual void onFileAdded( FilePtr file ) = 0;
+    virtual void onDiscoveryCompleted( const std::string& entryPoint ) = 0;
 };
 
 class IMediaLibrary

src/MediaLibrary.cpp

@@ -220,10 +220,15 @@ void MediaLibrary::discover( const std::string &entryPoint )
     std::thread t([this, entryPoint] {
         //FIXME: This will crash if the media library gets deleted while we
         //are discovering.
+        if ( m_callback != nullptr )
+            m_callback->onDiscoveryStarted( entryPoint );
+
         for ( auto& d : m_discoverers )
             d->discover( entryPoint );
-        }
-    );
+
+        if ( m_callback != nullptr )
+            m_callback->onDiscoveryCompleted( entryPoint );
+    });
     t.detach();
 }
 
@@ -361,6 +366,10 @@ FilePtr MediaLibrary::addFile( const fs::IFile* file, unsigned int folderId )
         std::cerr << "Failed to add file " << file->fullPath() << " to the media library" << std::endl;
         return nullptr;
     }
+    // Keep in mind that this is queued by the parser thread, there is no waranty about
+    // when the metadata will be available
+    if ( m_callback != nullptr )
+        m_callback->onFileAdded( fptr );
     m_parser->parse( fptr, m_callback );
     return fptr;
 }

test/VLCMetadataServices.cpp

@@ -20,6 +20,11 @@ class ServiceCb : public IMediaLibraryCb
         {
             waitCond.notify_all();
         }
+
+        // IMediaLibraryCb interface
+        virtual void onDiscoveryStarted( const std::string& ) override {}
+        virtual void onFileAdded( FilePtr ) override {}
+        virtual void onDiscoveryCompleted( const std::string& ) override {}
 };
 
 class VLCMetadataServices : public Tests