2 # Copyright (C) 2019 EfficiOS Inc.
4 # This program is free software; you can redistribute it and/or
5 # modify it under the terms of the GNU General Public License
6 # as published by the Free Software Foundation; only version 2
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 # GNU General Public License for more details.
14 # You should have received a copy of the GNU General Public License
15 # along with this program; if not, write to the Free Software
16 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 # Run callable `func` in the context of a component's __init__ method. The
22 # callable is passed the Component being instantiated.
24 # The value returned by the callable is returned by run_in_component_init.
27 def run_in_component_init(func
):
28 class MySink(bt2
._UserSinkComponent
):
29 def __init__(self
, params
):
31 res_bound
= func(self
)
33 def _user_consume(self
):
38 g
.add_component(MySink
, 'comp')
40 # We deliberately use a different variable for returning the result than
41 # the variable bound to the MySink.__init__ context and delete res_bound.
42 # The MySink.__init__ context stays alive until the end of the program, so
43 # if res_bound were to still point to our result, it would contribute an
44 # unexpected reference to the refcount of the result, from the point of view
45 # of the user of this function. It would then affect destruction tests,
46 # for example, which want to test what happens when the refcount of a Python
54 # Create an empty trace class with default values.
57 def get_default_trace_class():
59 return comp_self
._create
_trace
_class
()
61 return run_in_component_init(f
)
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