Python plugin provider: only finalize interpreter if we initialized it
[babeltrace.git] / bindings / python / bt2 / bt2 / query_executor.py
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1# The MIT License (MIT)
2#
3# Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com>
4#
5# Permission is hereby granted, free of charge, to any person obtaining a copy
6# of this software and associated documentation files (the "Software"), to deal
7# in the Software without restriction, including without limitation the rights
8# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9# copies of the Software, and to permit persons to whom the Software is
10# furnished to do so, subject to the following conditions:
11#
12# The above copyright notice and this permission notice shall be included in
13# all copies or substantial portions of the Software.
14#
15# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21# THE SOFTWARE.
22
23from bt2 import native_bt, object, utils
24import bt2.component
25import bt2
26
27
28class QueryExecutor(object._Object):
29 def _handle_status(self, status, gen_error_msg):
30 if status == native_bt.QUERY_STATUS_AGAIN:
31 raise bt2.TryAgain
32 elif status == native_bt.QUERY_STATUS_EXECUTOR_CANCELED:
33 raise bt2.QueryExecutorCanceled
34 elif status == native_bt.QUERY_STATUS_INVALID_OBJECT:
35 raise bt2.InvalidQueryObject
36 elif status == native_bt.QUERY_STATUS_INVALID_PARAMS:
37 raise bt2.InvalidQueryParams
38 elif status < 0:
39 raise bt2.Error(gen_error_msg)
40
41 def __init__(self):
42 ptr = native_bt.query_executor_create()
43
44 if ptr is None:
45 raise bt2.CreationError('cannot create query executor object')
46
47 super().__init__(ptr)
48
49 def cancel(self):
50 status = native_bt.query_executor_cancel(self._ptr)
51 self._handle_status(status, 'cannot cancel query executor object')
52
53 @property
54 def is_canceled(self):
55 is_canceled = native_bt.query_executor_is_canceled(self._ptr)
56 assert(is_canceled >= 0)
57 return is_canceled > 0
58
59 def query(self, component_class, object, params=None):
60 if not isinstance(component_class, bt2.component._GenericComponentClass):
61 err = False
62
63 try:
64 if not issubclass(component_class, bt2.component._UserComponent):
65 err = True
66 except TypeError:
67 err = True
68
69 if err:
70 o = component_class
71 raise TypeError("'{}' is not a component class object".format(o))
72
73 utils._check_str(object)
74
75 if params is None:
76 params_ptr = native_bt.value_null
77 else:
78 params = bt2.create_value(params)
79 params_ptr = params._ptr
80
81 if isinstance(component_class, bt2.component._GenericComponentClass):
82 cc_ptr = component_class._ptr
83 else:
84 cc_ptr = component_class._cc_ptr
85
86 status, result_ptr = native_bt.query_executor_query(self._ptr, cc_ptr,
87 object, params_ptr)
88 self._handle_status(status, 'cannot query component class')
89 assert(result_ptr)
90 return bt2.values._create_from_ptr(result_ptr)
91
92 def __eq__(self, other):
93 if type(other) is not type(self):
94 return False
95
96 return self.addr == other.addr
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