google.adk.cli.service_registry.get_service_registry()
https://github.com/google/adk-python/blob/v1.23.0/src/google/adk/cli/service_registry.py#L154
Gets the singleton ServiceRegistry instance
#google.adk.cli.service_registry.ServiceRegistry
_register_builtin_services()を呼ぶ
https://github.com/google/adk-python/blob/v1.23.0/src/google/adk/cli/service_registry.py#L218
URLスキーム: 具象SessionService
memory: InMemorySessionService
agentengine: VertexAiSessionService
postgresql, mysql: DatabaseSessionService
sqlite: SqliteSessionService
session_service_uri を urllib.parse.urlparse でパース
agentengine://projects/{project_id}/locations/{location}/reasoningEngines/{resource_id}
スキームを除いて、/で分割して取り出している
https://github.com/google/adk-python/blob/v1.23.0/src/google/adk/cli/service_registry.py#L344