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1# This file is part of ctrl_mpexec. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (http://www.lsst.org). 

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

7# for details of code ownership. 

8# 

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

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

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

12# (at your option) any later version. 

13# 

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

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

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

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

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

21 

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

23""" 

24 

25__all__ = ["TaskFactory"] 

26 

27import logging 

28 

29from lsst.pipe.base import TaskFactory as BaseTaskFactory 

30from lsst.daf.butler import DatasetType 

31 

32_LOG = logging.getLogger(__name__.partition(".")[2]) 

33 

34 

35class TaskFactory(BaseTaskFactory): 

36 """Class instantiating PipelineTasks. 

37 """ 

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

39 """Create new PipelineTask instance from its class. 

40 

41 Parameters 

42 ---------- 

43 taskClass : type 

44 PipelineTask class. 

45 config : `pex.Config` or None 

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

47 configuration class to create new instance. 

48 overrides : `ConfigOverrides` or None 

49 Configuration overrides, this should contain all overrides to be 

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

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

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

53 Butler instance used to obtain initialization inputs for 

54 PipelineTasks. If None, some PipelineTasks will not be usable 

55 

56 Returns 

57 ------- 

58 Instance of a PipelineTask class or None on errors. 

59 

60 Raises 

61 ------ 

62 Any exceptions that are raised by PipelineTask constructor or its 

63 configuration class are propagated back to caller. 

64 """ 

65 

66 # configuration 

67 if config is None: 

68 config = taskClass.ConfigClass() 

69 if overrides: 

70 overrides.applyTo(config) 

71 elif overrides is not None: 

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

73 taskClass.__name__) 

74 

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

76 # let PipelineTasks raise if that's impossible 

77 if butler is None: 

78 initInputs = None 

79 else: 

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

81 descriptorMap = {} 

82 for name in connections.initInputs: 

83 attribute = getattr(connections, name) 

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

85 attribute.storageClass) 

86 descriptorMap[name] = dsType 

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

88 

89 # Freeze the config 

90 config.freeze() 

91 

92 # make task instance 

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

94 

95 return task