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cpluginsvc.py
Go to the documentation of this file.
1 # cpluginsvc is a ctypes-based wrapper for the C-exposed API of GaudiPluginService
2 __doc__ = '''
3 cpluginsvc is a ctypes-based wrapper for the C-API of the GaudiPluginService.
4
5 e.g.:
6
7 >>> from GaudiPluginService import cpluginsvc
8 >>> for _,f in cpluginsvc.factories().items():
9 ... try:
10 ... f.load()
11 ... except Exception:
12 ... print ("** could not load [%s] for factory [%s]" % (f.library, f.name))
13 ... continue
14 ... print f
15 ... for k,v in f.properties.iteritems():
16 ... print ("\t%s: %s" % (k,v))
17 '''
18
19 import ctypes
20 import ctypes.util
21
22 __all__ = (
23 "Registry",
24 "registry",
25 "factories",
26 "Factory",
27 "Property",
28 )
29
30 _libname = None
31
32
33 def _get_filename():
34 if _libname:
35 return _libname
36 import platform
37 name = platform.system()
38
39 fname = {
40 'Darwin': "libGaudiPluginService.dylib",
41 'Windows': "libGaudiPluginService.dll",
42 'Linux': "libGaudiPluginService.so",
43 }[name]
44 return fname
45
46
47 _libname = _get_filename()
48 _lib = ctypes.cdll.LoadLibrary(_libname)
49
50
51 class Registry(ctypes.Structure):
52 '''Registry holds the list of factories known by the gaudi PluginService.
53 '''
54 _fields_ = [("_registry", ctypes.c_void_p)]
55
56 @property
57 def factories(self):
58 facts = {}
59 n = _lib.cgaudi_pluginsvc_get_factory_size(self)
60 for i in range(n):
61 f = _lib.cgaudi_pluginsvc_get_factory_at(self, i)
62 facts[f.name] = f
63 return facts
64 pass
65
66
67 _instance = None
68
69
70 def registry():
71 '''registry returns the singleton-like instance of the plugin service.'''
72
73 global _instance
74 if _instance:
75 return _instance
76 _instance = _lib.cgaudi_pluginsvc_instance()
77 return _instance
78
79
80 def factories():
81 '''
82 factories returns the list of components factory informations known to the plugin service
83 '''
84 return registry().factories
85
86
87 class Factory(ctypes.Structure):
88 """
89 Factory holds informations about a component's factory:
90 - its name
91 - the library hosting that component
92 - the type of component (algorithm, service, tool, ...)
93 - the return type of this factory
94 - the C++ class name of that component
95 - the properties which may decorate that component.
96 """
97 _fields_ = [
98 ("_registry", Registry),
99 ("_id", ctypes.c_char_p),
100 ]
101
102 @property
103 def name(self):
104 return self._id
105
106 @property
107 def library(self):
108 return _lib.cgaudi_factory_get_library(self)
109
110 @property
111 def type(self):
112 return _lib.cgaudi_factory_get_type(self)
113
114 @property
115 def rtype(self):
116 return _lib.cgaudi_factory_get_rtype(self)
117
118 @property
119 def classname(self):
120 return _lib.cgaudi_factory_get_classname(self)
121
122 @property
123 def properties(self):
124 props = {}
125 nprops = _lib.cgaudi_factory_get_property_size(self)
126 for i in range(nprops):
127 prop = _lib.cgaudi_factory_get_property_at(self, i)
128 props[prop.key] = prop.value
129 return props
130
131 def load(self):
132 '''load the C++ library hosting this factory
133 '''
134 return ctypes.cdll.LoadLibrary(self.library)
135
136 def __repr__(self):
137 return "<Factory id=%s library=%s type=%s rtype=%s class=%s props=%d>" % (
138 self._id,
139 self.library,
140 self.type,
141 self.rtype,
142 self.classname,
143 len(self.properties),
144 )
145 pass
146
147
148 class Property(ctypes.Structure):
149 '''
150 Property is a pair (key, value) optionally decorating a factory.
151 It is used to attach additional informations about a factory.
152 '''
153 _fields_ = [
154 ("_registry", Registry),
155 ("_id", ctypes.c_char_p),
156 ("_key", ctypes.c_char_p),
157 ]
158
159 @property
160 def key(self):
161 return _lib.cgaudi_property_get_key(self)
162
163 @property
164 def value(self):
165 return _lib.cgaudi_property_get_value(self)
166
167 pass
168
169
170 _functions_list = [
171 ("cgaudi_pluginsvc_instance",
172 [],
173 Registry,
174 ),
175
176 ("cgaudi_pluginsvc_get_factory_size",
177 [Registry],
178 ctypes.c_int,
179 ),
180
181 ("cgaudi_pluginsvc_get_factory_at",
182 [Registry, ctypes.c_int],
183 Factory,
184 ),
185
186 ("cgaudi_factory_get_library",
187 [Factory],
188 ctypes.c_char_p,
189 ),
190
191 ("cgaudi_factory_get_type",
192 [Factory],
193 ctypes.c_char_p,
194 ),
195
196 ("cgaudi_factory_get_rtype",
197 [Factory],
198 ctypes.c_char_p,
199 ),
200
201 ("cgaudi_factory_get_classname",
202 [Factory],
203 ctypes.c_char_p,
204 ),
205
206 ("cgaudi_factory_get_property_size",
207 [Factory],
208 ctypes.c_int,
209 ),
210
211 ("cgaudi_factory_get_property_at",
212 [Factory, ctypes.c_int],
213 Property,
214 ),
215
216 ("cgaudi_property_get_key",
217 [Property],
218 ctypes.c_char_p,
219 ),
220
221 ("cgaudi_property_get_value",
222 [Property],
223 ctypes.c_char_p,
224 )
225 ]
226
227 for f in _functions_list:
228 n = f[0]
229 func = getattr(_lib, n)
230 func.argtypes = f[1]
231 func.restype = f[2]
232 if len(f) == 4:
233 func.errcheck = f[3]
234 pass
235
236
237 if __name__ == "__main__":
238 print ("instance: %s" % registry())
239 print ("factories: %d" % len(factories()))
240 for _, f in factories().items():
241 try:
242 f.load()
243 except Exception:
244 print (
245 "** could not load [%s] for factory [%s]" % (f.library, f.name))
246 continue
247 print f
248 for k, v in f.properties.items():
249 print ("\t%s: %s" % (k, v))
250
251 # EOF
GaudiPluginService.cpluginsvc.Factory.type
def type(self)
Definition: cpluginsvc.py:111
GaudiPluginService.cpluginsvc.Registry
Definition: cpluginsvc.py:51
GaudiPluginService.cpluginsvc._get_filename
def _get_filename()
Definition: cpluginsvc.py:33
GaudiPluginService.cpluginsvc.Factory.classname
def classname(self)
Definition: cpluginsvc.py:119
GaudiPluginService.cpluginsvc.Factory.library
def library(self)
Definition: cpluginsvc.py:107
GaudiPluginService.cpluginsvc.Property
Definition: cpluginsvc.py:148
GaudiPluginService.cpluginsvc.Factory.properties
def properties(self)
Definition: cpluginsvc.py:123
GaudiPluginService.cpluginsvc.Factory
Definition: cpluginsvc.py:87
GaudiPluginService.cpluginsvc.Factory.rtype
def rtype(self)
Definition: cpluginsvc.py:115
GaudiPluginService.cpluginsvc.Factory.__repr__
def __repr__(self)
Definition: cpluginsvc.py:136
GaudiPluginService.cpluginsvc.Registry.factories
def factories(self)
Definition: cpluginsvc.py:57
GaudiPluginService.cpluginsvc.Property.value
def value(self)
Definition: cpluginsvc.py:164
Gaudi::Functional::details::zip::range
decltype(auto) range(Args &&...args)
Zips multiple containers together to form a single range.
Definition: FunctionalDetails.h:85
GaudiPluginService.cpluginsvc.registry
def registry()
Definition: cpluginsvc.py:70
GaudiPluginService.cpluginsvc.Factory.load
def load(self)
Definition: cpluginsvc.py:131
GaudiPluginService.cpluginsvc.Property.key
def key(self)
Definition: cpluginsvc.py:160
GaudiPluginService.cpluginsvc.factories
def factories()
Definition: cpluginsvc.py:80
GaudiPluginService.cpluginsvc.Factory.name
def name(self)
Definition: cpluginsvc.py:103