FactoryConfigFromEnvAndCLI reads the desired types of storage backends from SPAN_STORAGE and DEPENDENCY_STORAGE environment variable.

NewFactory creates the meta-factory.

DependencyStorageTypeEnvVar is the name of the env var that defines the type of backend used for dependencies storage.

SpanStorageTypeEnvVar is the name of the env var that defines the type of backend used for span storage.

Factory implements storage.Factory interface as a meta-factory for storage components.

FactoryConfig tells the Factory which types of backends it needs to create for different storage types.