neutron_lib.utils.runtime module

class neutron_lib.utils.runtime.NamespacedPlugins(namespace)

Bases: object

Wraps a stevedore plugin namespace to load/access its plugins.

get_plugin_class(plugin_name)

Gets a reference to a loaded plugin’s class.

Parameters:

plugin_name – The name of the plugin to get the class for.

Returns:

A reference to the loaded plugin’s class.

Raises:

KeyError if plugin_name is not loaded.

property loaded_plugin_names

new_plugin_instance(plugin_name, *args, **kwargs)

Create a new instance of a plugin.

Parameters:

• plugin_name – The name of the plugin to instantiate.

• args – Any args to pass onto the constructor.

• kwargs – Any kwargs to pass onto the constructor.

Returns:

A new instance of plugin_name.

Raises:

KeyError if plugin_name is not loaded.

reload()

Force a reload of the plugins for this instances namespace.

Returns:

None.

neutron_lib.utils.runtime.list_package_modules(package_name)

Get a list of the modules for a given package.

Parameters:

package_name – The package name to get modules for.

Returns:

A list of module objects for the said package name.

neutron_lib.utils.runtime.load_class_by_alias_or_classname(namespace, name)

Load a class using stevedore alias or the class name.

Parameters:

• namespace – The namespace where the alias is defined.

• name – The alias or class name of the class to be loaded.

Returns:

Class if it can be loaded.

Raises:

ImportError – if class cannot be loaded.