Added MusicProviderRegistry

app/registry/__init__.py

@@ -0,0 +1,3 @@
+from .music_provider_registry import MusicProviderRegistry
+
+__all__ = ["MusicProviderRegistry"]

app/registry/music_provider_registry.py

@@ -0,0 +1,35 @@
+from app.providers.base import MusicProviderClient
+
+
+class MusicProviderRegistry:
+    """
+    Registry to manage and retrieve music provider clients.
+    """
+    _providers = {}
+
+    @classmethod
+    def register_provider(cls, provider: MusicProviderClient):
+        """
+        Registers a music provider client instance.
+        :param provider: An instance of a MusicProviderClient subclass.
+        """
+        cls._providers[provider._identifier] = provider
+
+    @classmethod
+    def get_provider(cls, identifier: str) -> MusicProviderClient:
+        """
+        Retrieves a registered music provider client by its identifier.
+        :param identifier: The unique identifier for the provider.
+        :return: An instance of MusicProviderClient.
+        """
+        if identifier not in cls._providers:
+            raise ValueError(f"No provider found with identifier '{identifier}'.")
+        return cls._providers[identifier]
+
+    @classmethod
+    def list_providers(cls) -> list:
+        """
+        Lists all registered providers.
+        :return: A list of registered provider identifiers.
+        """
+        return list(cls._providers.keys())