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[chaz/yoink] / src / Moof / Mippleton.hh
1
2 /*******************************************************************************
3
4 Copyright (c) 2009, Charles McGarvey
5 All rights reserved.
6
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
9
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
15
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27 *******************************************************************************/
28
29 #ifndef _MOOF_MIPPLETON_HH_
30 #define _MOOF_MIPPLETON_HH_
31
32 /**
33 * @file Mippleton.hh
34 * Related to singletons, a mippleton is an object which can be obtained
35 * globally using a unique name. Unlike singletons, there can be multiple
36 * mippletons per class, each with a different name or identifier. Mippletons
37 * are create automatically when they are first requested (retained) and deleted
38 * after the last interested code releases its hold on the object.
39 */
40
41 #include <string>
42
43 #include <boost/shared_ptr.hpp>
44
45 #include <Moof/Hash.hh>
46
47
48 namespace Mf {
49
50
51 template <class T>
52 class Mippleton
53 {
54 typedef std::pair<unsigned,T*> PtrValue;
55 typedef stlplus::hash<std::string,PtrValue,getHash> PtrMap;
56
57 static PtrMap mPtrMap;
58 std::string mName;
59
60 static T* retain(const std::string& name)
61 {
62 typename PtrMap::iterator it = mPtrMap.find(name);
63
64 if (it != mPtrMap.end())
65 {
66 ++((*it).second.first);
67 return (*it).second.second;
68 }
69 else
70 {
71 T* newObj = new T(name);
72 mPtrMap.insert(std::make_pair(name, std::make_pair(1, newObj)));
73 return newObj;
74 }
75 }
76
77 static void release(T* obj)
78 {
79 releaseByName(obj->mName);
80 }
81
82 static void releaseByName(const std::string& name)
83 {
84 typename PtrMap::iterator it;
85
86 if ((it = mPtrMap.find(name)) != mPtrMap.end() && --(*it).second.first == 0)
87 {
88 delete (*it).second.second;
89 mPtrMap.erase((*it).first);
90 }
91 }
92
93 public:
94
95 explicit Mippleton(const std::string& name) :
96 mName(name) {}
97
98 const std::string& getName() const
99 {
100 return mName;
101 }
102
103 static boost::shared_ptr<T> getInstance(const std::string& name)
104 {
105 return boost::shared_ptr<T>(retain(name), &release);
106 }
107 };
108
109 template <class T>
110 stlplus::hash< std::string,std::pair<unsigned,T*>,getHash >
111 Mippleton<T>::mPtrMap;
112
113
114 } // namespace Mf
115
116 #endif // _MOOF_MIPPLETON_HH_
117
118 /** vim: set ts=4 sw=4 tw=80: *************************************************/
119
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