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90 lines
3.9 KiB
Python
90 lines
3.9 KiB
Python
5 years ago
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from .named import NamedExtensionManager
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class HookManager(NamedExtensionManager):
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"""Coordinate execution of multiple extensions using a common name.
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:param namespace: The namespace for the entry points.
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:type namespace: str
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:param name: The name of the hooks to load.
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:type name: str
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:param invoke_on_load: Boolean controlling whether to invoke the
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object returned by the entry point after the driver is loaded.
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:type invoke_on_load: bool
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:param invoke_args: Positional arguments to pass when invoking
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the object returned by the entry point. Only used if invoke_on_load
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is True.
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:type invoke_args: tuple
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:param invoke_kwds: Named arguments to pass when invoking
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the object returned by the entry point. Only used if invoke_on_load
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is True.
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:type invoke_kwds: dict
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:param on_load_failure_callback: Callback function that will be called when
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a entrypoint can not be loaded. The arguments that will be provided
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when this is called (when an entrypoint fails to load) are
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(manager, entrypoint, exception)
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:type on_load_failure_callback: function
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:param verify_requirements: Use setuptools to enforce the
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dependencies of the plugin(s) being loaded. Defaults to False.
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:type verify_requirements: bool
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:type on_missing_entrypoints_callback: function
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:param warn_on_missing_entrypoint: Flag to control whether failing
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to load a plugin is reported via a log mess. Only applies if
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on_missing_entrypoints_callback is None.
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:type warn_on_missing_entrypoint: bool
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"""
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def __init__(self, namespace, name,
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invoke_on_load=False, invoke_args=(), invoke_kwds={},
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on_load_failure_callback=None,
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verify_requirements=False,
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on_missing_entrypoints_callback=None,
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# NOTE(dhellmann): This default is different from the
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# base class because for hooks it is less likely to
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# be an error to have no entry points present.
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warn_on_missing_entrypoint=False):
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super(HookManager, self).__init__(
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namespace,
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[name],
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invoke_on_load=invoke_on_load,
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invoke_args=invoke_args,
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invoke_kwds=invoke_kwds,
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on_load_failure_callback=on_load_failure_callback,
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on_missing_entrypoints_callback=on_missing_entrypoints_callback,
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verify_requirements=verify_requirements,
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warn_on_missing_entrypoint=warn_on_missing_entrypoint,
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)
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def _init_attributes(self, namespace, names, name_order=False,
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propagate_map_exceptions=False,
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on_load_failure_callback=None):
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super(HookManager, self)._init_attributes(
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namespace, names,
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propagate_map_exceptions=propagate_map_exceptions,
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on_load_failure_callback=on_load_failure_callback)
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self._name = names[0]
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def __getitem__(self, name):
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"""Return the named extensions.
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Accessing a HookManager as a dictionary (``em['name']``)
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produces a list of the :class:`Extension` instance(s) with the
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specified name, in the order they would be invoked by map().
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"""
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if name != self._name:
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raise KeyError(name)
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return self.extensions
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