Package proton :: Module wrapper
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Source Code for Module proton.wrapper

  1  # 
  2  # Licensed to the Apache Software Foundation (ASF) under one 
  3  # or more contributor license agreements.  See the NOTICE file 
  4  # distributed with this work for additional information 
  5  # regarding copyright ownership.  The ASF licenses this file 
  6  # to you under the Apache License, Version 2.0 (the 
  7  # "License"); you may not use this file except in compliance 
  8  # with the License.  You may obtain a copy of the License at 
  9  # 
 10  #   http://www.apache.org/licenses/LICENSE-2.0 
 11  # 
 12  # Unless required by applicable law or agreed to in writing, 
 13  # software distributed under the License is distributed on an 
 14  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
 15  # KIND, either express or implied.  See the License for the 
 16  # specific language governing permissions and limitations 
 17  # under the License. 
 18  # 
 19  from cproton import * 
 20   
21 -class EmptyAttrs:
22
23 - def __contains__(self, name):
24 return False
25
26 - def __getitem__(self, name):
27 raise KeyError(name)
28
29 - def __setitem__(self, name, value):
30 raise TypeError("does not support item assignment")
31 32 EMPTY_ATTRS = EmptyAttrs() 33
34 -class Wrapper(object):
35
36 - def __init__(self, impl_or_constructor, get_context=None):
37 init = False 38 if callable(impl_or_constructor): 39 # we are constructing a new object 40 impl = impl_or_constructor() 41 if impl is None: 42 self.__dict__["_impl"] = impl 43 self.__dict__["_attrs"] = EMPTY_ATTRS 44 self.__dict__["_record"] = None 45 from proton import ProtonException 46 raise ProtonException("Wrapper failed to create wrapped object. Check for file descriptor or memory exhaustion.") 47 init = True 48 else: 49 # we are wrapping an existing object 50 impl = impl_or_constructor 51 pn_incref(impl) 52 53 if get_context: 54 record = get_context(impl) 55 attrs = pn_void2py(pn_record_get(record, PYCTX)) 56 if attrs is None: 57 attrs = {} 58 pn_record_def(record, PYCTX, PN_PYREF) 59 pn_record_set(record, PYCTX, pn_py2void(attrs)) 60 init = True 61 else: 62 attrs = EMPTY_ATTRS 63 init = False 64 record = None 65 self.__dict__["_impl"] = impl 66 self.__dict__["_attrs"] = attrs 67 self.__dict__["_record"] = record 68 if init: self._init()
69
70 - def __getattr__(self, name):
71 attrs = self.__dict__["_attrs"] 72 if name in attrs: 73 return attrs[name] 74 else: 75 raise AttributeError(name + " not in _attrs")
76
77 - def __setattr__(self, name, value):
78 if hasattr(self.__class__, name): 79 object.__setattr__(self, name, value) 80 else: 81 attrs = self.__dict__["_attrs"] 82 attrs[name] = value
83
84 - def __delattr__(self, name):
85 attrs = self.__dict__["_attrs"] 86 if attrs: 87 del attrs[name]
88
89 - def __hash__(self):
90 return hash(addressof(self._impl))
91
92 - def __eq__(self, other):
93 if isinstance(other, Wrapper): 94 return addressof(self._impl) == addressof(other._impl) 95 return False
96
97 - def __ne__(self, other):
98 if isinstance(other, Wrapper): 99 return addressof(self._impl) != addressof(other._impl) 100 return True
101
102 - def __del__(self):
103 pn_decref(self._impl)
104
105 - def __repr__(self):
106 return '<%s.%s 0x%x ~ 0x%x>' % (self.__class__.__module__, 107 self.__class__.__name__, 108 id(self), addressof(self._impl))
109 110 111 PYCTX = int(pn_py2void(Wrapper)) 112 addressof = int 113