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# This file is part of ctrl_mpexec. 

# 

# Developed for the LSST Data Management System. 

# This product includes software developed by the LSST Project 

# (http://www.lsst.org). 

# See the COPYRIGHT file at the top-level directory of this distribution 

# for details of code ownership. 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the GNU General Public License 

# along with this program. If not, see <http://www.gnu.org/licenses/>. 

 

"""Module which defines TaskFactory class and related methods. 

""" 

 

__all__ = ["TaskFactory"] 

 

import logging 

 

from lsst.pipe.base import TaskFactory as BaseTaskFactory 

from lsst.daf.butler import DatasetType 

 

_LOG = logging.getLogger(__name__.partition(".")[2]) 

 

 

class TaskFactory(BaseTaskFactory): 

"""Class instantiating PipelineTasks. 

""" 

def makeTask(self, taskClass, config, overrides, butler): 

"""Create new PipelineTask instance from its class. 

 

Parameters 

---------- 

taskClass : type 

PipelineTask class. 

config : `pex.Config` or None 

Configuration object, if ``None`` then use task-defined 

configuration class to create new instance. 

overrides : `ConfigOverrides` or None 

Configuration overrides, this should contain all overrides to be 

applied to a default task config, including instrument-specific, 

obs-package specific, and possibly command-line overrides. 

butler : `lsst.daf.butler.Butler` or None 

Butler instance used to obtain initialization inputs for 

PipelineTasks. If None, some PipelineTasks will not be usable 

 

Returns 

------- 

Instance of a PipelineTask class or None on errors. 

 

Raises 

------ 

Any exceptions that are raised by PipelineTask constructor or its 

configuration class are propagated back to caller. 

""" 

 

# configuration 

if config is None: 

config = taskClass.ConfigClass() 

if overrides: 

overrides.applyTo(config) 

elif overrides is not None: 

_LOG.waring("Both config and overrides are specified for task %s, overrides are ignored", 

taskClass.__name__) 

 

# if we don't have a butler, try to construct without initInputs; 

# let PipelineTasks raise if that's impossible 

if butler is None: 

initInputs = None 

else: 

connections = config.connections.ConnectionsClass(config=config) 

descriptorMap = {} 

for name in connections.initInputs: 

attribute = getattr(connections, name) 

dsType = DatasetType(attribute.name, butler.registry.dimensions.extract(set()), 

attribute.storageClass) 

descriptorMap[name] = dsType 

initInputs = {k: butler.get(v) for k, v in descriptorMap.items()} 

 

# make task instance 

task = taskClass(config=config, initInputs=initInputs) 

 

return task