des.util.arch.emm source code

1 /+
2 The MIT License (MIT)
3 
4     Copyright (c) <2013> <Oleg Butko (deviator), Anton Akzhigitov (Akzwar)>
5 
6     Permission is hereby granted, free of charge, to any person obtaining a copy
7     of this software and associated documentation files (the "Software"), to deal
8     in the Software without restriction, including without limitation the rights
9     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10     copies of the Software, and to permit persons to whom the Software is
11     furnished to do so, subject to the following conditions:
12 
13     The above copyright notice and this permission notice shall be included in
14     all copies or substantial portions of the Software.
15 
16     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19     AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22     THE SOFTWARE.
23 +/
24 
25 module des.util.arch.emm;
26 
27 import des.util.arch.tree;
28 
29 ///
30 interface ExternalMemoryManager : TNode!(ExternalMemoryManager,"","EMM")
31 {
32     ///
33     mixin template EMM(string file=__FILE__,size_t line=__LINE__)
34     {
35         static if( !is(typeof(__EMM_BASE_IMPLEMENT)) )
36         {
37             protected enum __EMM_BASE_IMPLEMENT = true;
38 
39             mixin TNodeHelperEMM!(true,true,true);
40 
41             private bool is_destroyed = false;
42             public final bool isDestroyed() const { return is_destroyed; }
43             protected final void isDestroyed( bool d )
44             {
45                 bool change = is_destroyed != d;
46                 is_destroyed = d;
47                 if( change && !is_destroyed )
48                     selfConstruct();
49             }
50 
51             import std.traits;
52 
53             protected override
54             {
55                 static if( isAbstractFunction!selfConstruct ) void selfConstruct() {}
56                 static if( isAbstractFunction!selfDestroy ) void selfDestroy() {}
57                 static if( isAbstractFunction!preChildsDestroy ) void preChildsDestroy() {}
58             }
59         }
60         else
61         {
62             version(emmcheck)
63                 pragma(msg, format( "WARNING: duplicate mixin EMM at %s:%d", file, line ) );
64         }
65     }
66 
67     protected
68     {
69         ///
70         @property void isDestroyed( bool d );
71 
72         ///
73         void selfConstruct();
74         ///
75         void selfDestroy();
76         ///
77         void preChildsDestroy();
78     }
79 
80     ///
81     @property bool isDestroyed() const;
82 
83     final
84     {
85         ///
86         T registerChildEMM(T)( T obj )
87             if( is( T == class ) || is( T == interface ) )
88         {
89             auto cemm = cast(ExternalMemoryManager)obj;
90             if( cemm ) attachChildsEMM( cemm );
91             return obj;
92         }
93 
94         ///
95         T[] registerChildEMM(T)( T[] objs )
96             if( is( T == class ) || is( T == interface ) )
97         {
98             foreach( obj; objs )
99                 registerChildEMM( obj );
100             return objs;
101         }
102 
103         ///
104         T newEMM(T,Args...)( Args args )
105         { return registerChildEMM( new T(args) ); }
106 
107         ///
108         void destroy()
109         {
110             if( isDestroyed ) return;
111             preChildsDestroy();
112             foreach( cemm; childsEMM )
113                 cemm.destroy();
114             selfDestroy();
115             isDestroyed = true;
116         }
117     }
118 }
119 
120 version(todos) pragma(msg,__FILE__, "TODO: add unittests");