included manager class
[chaz/yoink] / src / Moof / Manager.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_MANAGER_HH_
30 #define _MOOF_MANAGER_HH_
31
32 /**
33 * @file Manager.hh
34 * A library is a collection of named objects of the same type. Libraries use
35 * reference counting to automagically delete objects which no longer have any
36 * interested code.
37 */
38
39 #include <string>
40
41 #include <boost/shared_ptr.hpp>
42
43 #include <Moof/Hash.hh>
44
45
46 namespace Mf {
47
48
49 template <class T>
50 class Manager
51 {
52 public:
53
54 Manager() :
55 mRetainCount(1) {}
56
57 const std::string& getName() const
58 {
59 return mName;
60 }
61
62 static boost::shared_ptr<T> getInstance(const std::string& name)
63 {
64 return boost::shared_ptr<T>(retain(name), &release);
65 }
66
67 private:
68
69 typedef stlplus::hash<std::string,T*,getHash> PtrMap;
70
71 static PtrMap mPtrMap;
72 std::string mName;
73 unsigned mRetainCount;
74
75 static T* retain(const std::string& name)
76 {
77 typename PtrMap::iterator it = mPtrMap.find(name);
78
79 if (it != mPtrMap.end())
80 {
81 ++((*it).second->mRetainCount);
82 return (*it).second;
83 }
84 else
85 {
86 T* newObj(new T);
87 if (newObj)
88 {
89 newObj->mName = name;
90 newObj->init(name);
91 mPtrMap.insert(std::make_pair(name, newObj));
92 }
93 return newObj;
94 }
95 }
96
97 static void release(T* obj)
98 {
99 if (--(obj->mRetainCount) == 0)
100 {
101 mPtrMap.erase(obj->mName);
102 delete obj;
103 }
104 }
105 };
106
107 template <class T>
108 stlplus::hash<std::string,T*,getHash> Manager<T>::mPtrMap;
109
110
111 } // namespace Mf
112
113 #endif // _MOOF_MANAGER_HH_
114
115 /** vim: set ts=4 sw=4 tw=80: *************************************************/
116
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