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1 | /*************************************************************************** |
2 | * Copyright (C) 2008 by Gerd v. Egidy and Reinhard Pfau * | |
3 | * gve@intra2net.com * | |
4 | * * | |
5 | * This library is free software; you can redistribute it and/or modify * | |
6 | * it under the terms of the GNU Lesser General Public License version * | |
7 | * 2.1 as published by the Free Software Foundation. * | |
8 | * * | |
9 | * This library 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 Lesser General Public License for more details. * | |
13 | * * | |
14 | * You should have received a copy of the GNU Lesser General Public * | |
15 | * License along with this program; if not, write to the * | |
16 | * Free Software Foundation, Inc., * | |
17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * | |
18 | ***************************************************************************/ | |
19 | #ifndef __LIBT2N_CLIENT_WRAPPER | |
20 | #define __LIBT2N_CLIENT_WRAPPER | |
21 | ||
22 | #include <functional> | |
23 | ||
24 | #include <boost/config.hpp> | |
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25 | #include <boost/bind.hpp> |
26 | #include <boost/function.hpp> | |
27 | #include <boost/preprocessor.hpp> | |
28 | ||
29 | #include <client.hxx> | |
30 | #include <command_client.hxx> | |
31 | ||
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32 | #ifndef T2N_SINGLETON_WRAPPER_MAX_ARGS |
33 | #define T2N_SINGLETON_WRAPPER_MAX_ARGS 9 | |
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34 | #endif |
35 | ||
36 | namespace libt2n | |
37 | { | |
38 | ||
0ea6d528 | 39 | class ConnectionWrapper |
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40 | { |
41 | public: | |
42 | ||
0ea6d528 | 43 | virtual client_connection* get_connection()=0; |
45508d07 | 44 | |
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45 | virtual long long get_command_timeout_usec(void) |
46 | { | |
47 | return command_client::command_timeout_usec_default; | |
48 | } | |
45508d07 | 49 | |
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50 | virtual long long get_hello_timeout_usec(void) |
51 | { | |
52 | return command_client::hello_timeout_usec_default; | |
53 | } | |
54 | ||
55 | virtual void handle(command_client* stubBase, boost::function< void() > f) | |
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56 | { |
57 | f(); | |
58 | } | |
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59 | |
60 | virtual ~ConnectionWrapper() | |
61 | { } | |
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62 | }; |
63 | ||
64 | // contains the internal stuff needed for T2nWrapper | |
65 | namespace detail | |
66 | { | |
67 | ||
68 | template< typename T > | |
69 | struct TypeWrap | |
70 | { | |
71 | typedef T type; | |
72 | }; | |
73 | ||
74 | template< > | |
75 | struct TypeWrap< void > | |
76 | { | |
77 | typedef int type; | |
78 | }; | |
79 | ||
80 | template< typename R > | |
81 | struct Call | |
82 | { | |
83 | typedef boost::function< R() > FuncType; | |
84 | ||
85 | FuncType function; | |
86 | R& result; | |
87 | ||
88 | Call( FuncType f, R& res ) : function(f), result( res ) {} | |
89 | ||
90 | void operator()() | |
91 | { | |
92 | result= function(); | |
93 | } | |
94 | }; | |
95 | ||
96 | template< > | |
97 | struct Call<void> | |
98 | { | |
99 | typedef boost::function< void() > FuncType; | |
100 | typedef TypeWrap< void >::type ResultType; | |
101 | ||
102 | FuncType function; | |
103 | ResultType& result; | |
104 | ||
105 | Call( FuncType f, ResultType& res ) : function(f), result( res ) {} | |
106 | ||
107 | void operator()() | |
108 | { | |
109 | function(); | |
110 | result= ResultType(); | |
111 | } | |
112 | }; | |
113 | } // eo namespace detail | |
114 | ||
0ea6d528 | 115 | class T2nSingletonWrapperMessages |
45508d07 | 116 | { |
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117 | protected: |
118 | static const char* NotInitializedMessage; | |
119 | }; | |
45508d07 | 120 | |
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121 | template< class Client > |
122 | class T2nSingletonWrapper : public T2nSingletonWrapperMessages | |
123 | { | |
124 | private: | |
125 | std::auto_ptr<Client> Stub; | |
45508d07 | 126 | |
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127 | static std::auto_ptr<T2nSingletonWrapper> SingletonObject; |
128 | static std::auto_ptr<ConnectionWrapper> WrappedConnection; | |
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129 | |
130 | // create a prep-method for each possible number of parameters | |
131 | #define _GEN_ARG(z,n,d) Arg ## n arg ##n | |
132 | #define _GEN_PREP(z,n,d) \ | |
133 | template< typename R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,typename Arg) > \ | |
134 | static boost::function< R(Client*) > prep \ | |
135 | ( \ | |
136 | R(Client::*f)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \ | |
137 | BOOST_PP_COMMA_IF(n) \ | |
138 | BOOST_PP_ENUM( n, _GEN_ARG, ~ ) \ | |
139 | ) \ | |
140 | { \ | |
141 | return boost::bind< R > \ | |
142 | ( \ | |
143 | f, _1 BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,arg) \ | |
144 | ); \ | |
145 | } // eo prep | |
146 | ||
0ea6d528 | 147 | BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1) , _GEN_PREP, ~ ) |
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148 | |
149 | #undef _GEN_PREP | |
150 | #undef _GEN_ARG | |
151 | ||
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152 | T2nSingletonWrapper(std::auto_ptr<Client> stub) |
153 | { | |
154 | Stub=stub; | |
155 | } | |
156 | ||
157 | static void init() | |
45508d07 | 158 | { |
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159 | if (WrappedConnection.get() == NULL) |
160 | throw std::logic_error(NotInitializedMessage); | |
45508d07 | 161 | |
a64066eb | 162 | std::auto_ptr<Client> stub(new Client(*(WrappedConnection->get_connection()), |
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163 | WrappedConnection->get_command_timeout_usec(), |
164 | WrappedConnection->get_hello_timeout_usec())); | |
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165 | |
166 | SingletonObject=std::auto_ptr<T2nSingletonWrapper>(new T2nSingletonWrapper(stub)); | |
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167 | } |
168 | ||
169 | template< typename R > | |
170 | static | |
171 | typename detail::TypeWrap<R>::type real_exec( boost::function< R(Client*) > f) | |
172 | { | |
0ea6d528 | 173 | ensure_singleton_there(); |
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174 | |
175 | typename detail::TypeWrap<R>::type result; | |
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176 | detail::Call<R> call( boost::bind( f, SingletonObject->Stub.get()), result ); |
177 | WrappedConnection->handle(SingletonObject->Stub.get(),call); | |
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178 | return result; |
179 | } | |
180 | ||
181 | public: | |
182 | ||
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183 | static void set_connection(std::auto_ptr<ConnectionWrapper> wrappedConnection) |
184 | { | |
185 | WrappedConnection=wrappedConnection; | |
186 | ||
187 | // reset the singleton to NULL because the singleton must be constructed with current WrappedConnection | |
188 | if (SingletonObject.get() != NULL) | |
189 | SingletonObject.reset(); | |
190 | } | |
191 | static ConnectionWrapper* get_connection(void) | |
192 | { return WrappedConnection.get(); } | |
45508d07 | 193 | |
0ea6d528 | 194 | static void ensure_singleton_there(void) |
45508d07 | 195 | { |
0ea6d528 | 196 | if (SingletonObject.get() == NULL) |
a64066eb | 197 | init(); |
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198 | } |
199 | ||
200 | // create an exec-method for each possible number of parameters | |
201 | #define _GEN_PLACEHOLDER(z,n,d) BOOST_PP_CAT(_,BOOST_PP_ADD(n,1)) | |
202 | #define _GEN_EXEC(z,n,d) \ | |
203 | template< typename R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,typename Arg) > \ | |
204 | static boost::function< R( BOOST_PP_ENUM_PARAMS(n,Arg) ) > exec \ | |
205 | ( \ | |
206 | R(Client::*f)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \ | |
207 | ) \ | |
208 | { \ | |
209 | boost::function<R(Client*)>(*p)(R(Client::*)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \ | |
210 | BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,Arg)) \ | |
0ea6d528 | 211 | = &T2nSingletonWrapper::template prep<R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,Arg) >; \ |
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212 | return boost::bind \ |
213 | ( \ | |
0ea6d528 | 214 | T2nSingletonWrapper::template real_exec<R>, \ |
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215 | boost::bind( p, f BOOST_PP_COMMA_IF(n) \ |
216 | BOOST_PP_ENUM(n, _GEN_PLACEHOLDER, ~ ) ) \ | |
217 | ); \ | |
218 | } // eo exec | |
219 | ||
0ea6d528 | 220 | BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1), _GEN_EXEC, ~ ) |
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221 | |
222 | #undef _GEN_EXEC | |
223 | #undef _GEN_PLACEHOLDER | |
224 | ||
225 | }; | |
226 | ||
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227 | // create an t2n_exec-method for each possible number of parameters |
228 | #define _GEN_EXEC(z,n,d) \ | |
229 | template< class Client, typename R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,typename Arg) > \ | |
230 | static boost::function< R( BOOST_PP_ENUM_PARAMS(n,Arg) ) > t2n_exec \ | |
231 | ( \ | |
232 | R(Client::*f)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \ | |
233 | ) \ | |
234 | { \ | |
235 | return T2nSingletonWrapper<Client>::exec(f); \ | |
236 | } // eo exec | |
237 | ||
238 | BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1), _GEN_EXEC, ~ ) | |
239 | ||
240 | #undef _GEN_EXEC | |
241 | #undef _GEN_PLACEHOLDER | |
242 | ||
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243 | } |
244 | #endif |