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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> | |
25 | #include <boost/any.hpp> | |
26 | #include <boost/bind.hpp> | |
27 | #include <boost/function.hpp> | |
28 | #include <boost/preprocessor.hpp> | |
29 | ||
30 | #include <client.hxx> | |
31 | #include <command_client.hxx> | |
32 | ||
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33 | #ifndef T2N_SINGLETON_WRAPPER_MAX_ARGS |
34 | #define T2N_SINGLETON_WRAPPER_MAX_ARGS 9 | |
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35 | #endif |
36 | ||
37 | namespace libt2n | |
38 | { | |
39 | ||
0ea6d528 | 40 | class ConnectionWrapper |
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41 | { |
42 | public: | |
43 | ||
0ea6d528 | 44 | virtual client_connection* get_connection()=0; |
45508d07 | 45 | |
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46 | virtual long long get_command_timeout_usec(void) |
47 | { | |
48 | return command_client::command_timeout_usec_default; | |
49 | } | |
45508d07 | 50 | |
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51 | virtual long long get_hello_timeout_usec(void) |
52 | { | |
53 | return command_client::hello_timeout_usec_default; | |
54 | } | |
55 | ||
56 | virtual void handle(command_client* stubBase, boost::function< void() > f) | |
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57 | { |
58 | f(); | |
59 | } | |
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60 | |
61 | virtual ~ConnectionWrapper() | |
62 | { } | |
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63 | }; |
64 | ||
65 | // contains the internal stuff needed for T2nWrapper | |
66 | namespace detail | |
67 | { | |
68 | ||
69 | template< typename T > | |
70 | struct TypeWrap | |
71 | { | |
72 | typedef T type; | |
73 | }; | |
74 | ||
75 | template< > | |
76 | struct TypeWrap< void > | |
77 | { | |
78 | typedef int type; | |
79 | }; | |
80 | ||
81 | template< typename R > | |
82 | struct Call | |
83 | { | |
84 | typedef boost::function< R() > FuncType; | |
85 | ||
86 | FuncType function; | |
87 | R& result; | |
88 | ||
89 | Call( FuncType f, R& res ) : function(f), result( res ) {} | |
90 | ||
91 | void operator()() | |
92 | { | |
93 | result= function(); | |
94 | } | |
95 | }; | |
96 | ||
97 | template< > | |
98 | struct Call<void> | |
99 | { | |
100 | typedef boost::function< void() > FuncType; | |
101 | typedef TypeWrap< void >::type ResultType; | |
102 | ||
103 | FuncType function; | |
104 | ResultType& result; | |
105 | ||
106 | Call( FuncType f, ResultType& res ) : function(f), result( res ) {} | |
107 | ||
108 | void operator()() | |
109 | { | |
110 | function(); | |
111 | result= ResultType(); | |
112 | } | |
113 | }; | |
114 | } // eo namespace detail | |
115 | ||
0ea6d528 | 116 | class T2nSingletonWrapperMessages |
45508d07 | 117 | { |
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118 | protected: |
119 | static const char* NotInitializedMessage; | |
120 | }; | |
45508d07 | 121 | |
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122 | template< class Client > |
123 | class T2nSingletonWrapper : public T2nSingletonWrapperMessages | |
124 | { | |
125 | private: | |
126 | std::auto_ptr<Client> Stub; | |
45508d07 | 127 | |
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128 | static std::auto_ptr<T2nSingletonWrapper> SingletonObject; |
129 | static std::auto_ptr<ConnectionWrapper> WrappedConnection; | |
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130 | |
131 | // create a prep-method for each possible number of parameters | |
132 | #define _GEN_ARG(z,n,d) Arg ## n arg ##n | |
133 | #define _GEN_PREP(z,n,d) \ | |
134 | template< typename R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,typename Arg) > \ | |
135 | static boost::function< R(Client*) > prep \ | |
136 | ( \ | |
137 | R(Client::*f)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \ | |
138 | BOOST_PP_COMMA_IF(n) \ | |
139 | BOOST_PP_ENUM( n, _GEN_ARG, ~ ) \ | |
140 | ) \ | |
141 | { \ | |
142 | return boost::bind< R > \ | |
143 | ( \ | |
144 | f, _1 BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,arg) \ | |
145 | ); \ | |
146 | } // eo prep | |
147 | ||
0ea6d528 | 148 | BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1) , _GEN_PREP, ~ ) |
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149 | |
150 | #undef _GEN_PREP | |
151 | #undef _GEN_ARG | |
152 | ||
0ea6d528 | 153 | T2nSingletonWrapper() |
45508d07 | 154 | { |
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155 | if (WrappedConnection.get() == NULL) |
156 | throw std::logic_error(NotInitializedMessage); | |
45508d07 | 157 | |
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158 | Stub=std::auto_ptr<Client>(new Client(*(WrappedConnection->get_connection()), |
159 | WrappedConnection->get_command_timeout_usec(), | |
160 | WrappedConnection->get_hello_timeout_usec())); | |
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161 | } |
162 | ||
163 | template< typename R > | |
164 | static | |
165 | typename detail::TypeWrap<R>::type real_exec( boost::function< R(Client*) > f) | |
166 | { | |
0ea6d528 | 167 | ensure_singleton_there(); |
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168 | |
169 | typename detail::TypeWrap<R>::type result; | |
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170 | detail::Call<R> call( boost::bind( f, SingletonObject->Stub.get()), result ); |
171 | WrappedConnection->handle(SingletonObject->Stub.get(),call); | |
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172 | return result; |
173 | } | |
174 | ||
175 | public: | |
176 | ||
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177 | static void set_connection(std::auto_ptr<ConnectionWrapper> wrappedConnection) |
178 | { | |
179 | WrappedConnection=wrappedConnection; | |
180 | ||
181 | // reset the singleton to NULL because the singleton must be constructed with current WrappedConnection | |
182 | if (SingletonObject.get() != NULL) | |
183 | SingletonObject.reset(); | |
184 | } | |
185 | static ConnectionWrapper* get_connection(void) | |
186 | { return WrappedConnection.get(); } | |
45508d07 | 187 | |
0ea6d528 | 188 | static void ensure_singleton_there(void) |
45508d07 | 189 | { |
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190 | if (SingletonObject.get() == NULL) |
191 | SingletonObject=std::auto_ptr<T2nSingletonWrapper>(new T2nSingletonWrapper()); | |
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192 | } |
193 | ||
194 | // create an exec-method for each possible number of parameters | |
195 | #define _GEN_PLACEHOLDER(z,n,d) BOOST_PP_CAT(_,BOOST_PP_ADD(n,1)) | |
196 | #define _GEN_EXEC(z,n,d) \ | |
197 | template< typename R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,typename Arg) > \ | |
198 | static boost::function< R( BOOST_PP_ENUM_PARAMS(n,Arg) ) > exec \ | |
199 | ( \ | |
200 | R(Client::*f)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \ | |
201 | ) \ | |
202 | { \ | |
203 | boost::function<R(Client*)>(*p)(R(Client::*)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \ | |
204 | BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,Arg)) \ | |
0ea6d528 | 205 | = &T2nSingletonWrapper::template prep<R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,Arg) >; \ |
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206 | return boost::bind \ |
207 | ( \ | |
0ea6d528 | 208 | T2nSingletonWrapper::template real_exec<R>, \ |
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209 | boost::bind( p, f BOOST_PP_COMMA_IF(n) \ |
210 | BOOST_PP_ENUM(n, _GEN_PLACEHOLDER, ~ ) ) \ | |
211 | ); \ | |
212 | } // eo exec | |
213 | ||
0ea6d528 | 214 | BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1), _GEN_EXEC, ~ ) |
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215 | |
216 | #undef _GEN_EXEC | |
217 | #undef _GEN_PLACEHOLDER | |
218 | ||
219 | }; | |
220 | ||
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221 | // create an t2n_exec-method for each possible number of parameters |
222 | #define _GEN_EXEC(z,n,d) \ | |
223 | template< class Client, typename R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,typename Arg) > \ | |
224 | static boost::function< R( BOOST_PP_ENUM_PARAMS(n,Arg) ) > t2n_exec \ | |
225 | ( \ | |
226 | R(Client::*f)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \ | |
227 | ) \ | |
228 | { \ | |
229 | return T2nSingletonWrapper<Client>::exec(f); \ | |
230 | } // eo exec | |
231 | ||
232 | BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1), _GEN_EXEC, ~ ) | |
233 | ||
234 | #undef _GEN_EXEC | |
235 | #undef _GEN_PLACEHOLDER | |
236 | ||
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237 | } |
238 | #endif |