asset manager method to check asset

Author: malytomas

sources/include/cage-core/assetsManager.h

@@ -47,6 +47,9 @@ namespace cage
 			return get_(Scheme, assetId).template cast<T>();
 		}
 
+		// returns true if the asset exists and is successfully loaded
+		bool check(uint32 assetId) const;
+
 		// end thread-safe methods
 
 		void listen(const String &address = "localhost", uint16 port = 65042, uint64 listenerPeriod = 100000);

sources/libcore/assets/assetsManager.cpp

@@ -587,6 +587,18 @@ namespace cage
 		return name++;
 	}
 
+	bool AssetsManager::check(uint32 assetId) const
+	{
+		CAGE_ASSERT(assetId != 0 && assetId != m);
+		const AssetsManagerImpl *impl = (const AssetsManagerImpl *)this;
+		const auto &publicIndex = impl->publicIndex;
+		ScopeLock lock(impl->publicMutex, ReadLockTag());
+		auto it = publicIndex.find(assetId);
+		if (it == publicIndex.end())
+			return false; // not found
+		return !it->second->failed;
+	}
+
 	void AssetsManager::listen(const String &address, uint16 port, uint64 listenerPeriod)
 	{
 		class AssetListenerImpl