From: Gerd v. Egidy <gerd.von.egidy@intra2net.com>
Date: Wed, 23 Jul 2008 17:01:15 +0000 (+0000)
Subject: libt2n: (gerd) more progress with T2nSingletonWrapper (compiles but not complete... 
X-Git-Tag: v0.4~20
X-Git-Url: http://developer.intra2net.com/git/?p=libt2n;a=commitdiff_plain;h=0ea6d528901a0eeb0fce1c2a71ae69c277798142

libt2n: (gerd) more progress with T2nSingletonWrapper (compiles but not complete yet)
---

diff --git a/src/client_wrapper.hxx b/src/client_wrapper.hxx
index 08cd397..0822af0 100644
--- a/src/client_wrapper.hxx
+++ b/src/client_wrapper.hxx
@@ -30,30 +30,36 @@
 #include <client.hxx>
 #include <command_client.hxx>
 
-#ifndef T2NWRAPPER_MAX_ARGS
-#define T2NWRAPPER_MAX_ARGS 9
+#ifndef T2N_SINGLETON_WRAPPER_MAX_ARGS
+#define T2N_SINGLETON_WRAPPER_MAX_ARGS 9
 #endif
 
 namespace libt2n
 {
 
-class ConnectionInitData
+class ConnectionWrapper
 {
     public:
 
-        virtual std::auto_ptr<client_connection> createConnection()=0;
+        virtual client_connection* get_connection()=0;
 
-        virtual ~ConnectionInitData()
-            { }
-};
+        virtual long long get_command_timeout_usec(void)
+        {
+            return command_client::command_timeout_usec_default;
+        }
 
-class TrivialHandler
-{
-    public:
-        static void handle( boost::function< void() > f)
+        virtual long long get_hello_timeout_usec(void)
+        {
+            return command_client::hello_timeout_usec_default;
+        }
+
+        virtual void handle(command_client* stubBase, boost::function< void() > f)
         {
             f();
         }
+
+        virtual ~ConnectionWrapper()
+            { }
 };
 
 // contains the internal stuff needed for T2nWrapper
@@ -107,19 +113,20 @@ namespace detail
     };
 } // eo namespace detail
 
-template<
-    class Client,
-    class Handler = TrivialHandler
->
-class T2nWrapper
+class T2nSingletonWrapperMessages
 {
-    private:
+    protected:
+        static const char* NotInitializedMessage;
+};
 
-        std::auto_ptr<client_connection> conndConn;
-        std::auto_ptr<Client> client;
+template< class Client >
+class T2nSingletonWrapper : public T2nSingletonWrapperMessages
+{
+    private:
+        std::auto_ptr<Client> Stub;
 
-        static std::auto_ptr<T2nWrapper> singletonObject;
-        static std::auto_ptr<ConnectionInitData> initData;
+        static std::auto_ptr<T2nSingletonWrapper> SingletonObject;
+        static std::auto_ptr<ConnectionWrapper> WrappedConnection;
 
         // create a prep-method for each possible number of parameters
 #define _GEN_ARG(z,n,d) Arg ## n arg ##n
@@ -138,47 +145,50 @@ class T2nWrapper
                 ); \
         } // eo prep
 
-        BOOST_PP_REPEAT( BOOST_PP_ADD(T2NWRAPPER_MAX_ARGS,1) , _GEN_PREP, ~ )
+        BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1) , _GEN_PREP, ~ )
 
 #undef _GEN_PREP
 #undef _GEN_ARG
 
-        static void ensureSingletonThere(void)
+        T2nSingletonWrapper()
         {
-            if (singletonObject.get() == NULL)
-            {
-                // we need to initialize
-
-                if (initData.get() == NULL)
-                    throw std::logic_error("T2nWrapper singleton used before setting initData");
+            if (WrappedConnection.get() == NULL)
+                throw std::logic_error(NotInitializedMessage);
 
-                std::auto_ptr<client_connection> myConndConn=initData->createConnection();
-
-            }
+            Stub=std::auto_ptr<Client>(new Client(*(WrappedConnection->get_connection()),
+                WrappedConnection->get_command_timeout_usec(),
+                WrappedConnection->get_hello_timeout_usec()));
         }
 
         template< typename R >
         static
         typename detail::TypeWrap<R>::type real_exec( boost::function< R(Client*) > f)
         {
-            ensureSingletonThere();
+            ensure_singleton_there();
 
             typename detail::TypeWrap<R>::type result;
-            detail::Call<R> call( boost::bind( f, &(*(singletonObject->client))), result );
-            Handler::handle( call );
+            detail::Call<R> call( boost::bind( f, SingletonObject->Stub.get()), result );
+            WrappedConnection->handle(SingletonObject->Stub.get(),call);
             return result;
         }
 
     public:
 
-        static void setInitData(std::auto_ptr<ConnectionInitData> newInitData)
-            { initData=newInitData; }
-        static ConnectionInitData* getInitData(void)
-            { return initData.get(); }
+        static void set_connection(std::auto_ptr<ConnectionWrapper> wrappedConnection)
+        {
+            WrappedConnection=wrappedConnection;
+
+            // reset the singleton to NULL because the singleton must be constructed with current WrappedConnection
+            if (SingletonObject.get() != NULL)
+                SingletonObject.reset();
+        }
+        static ConnectionWrapper* get_connection(void)
+            { return WrappedConnection.get(); }
 
-        T2nWrapper()
+        static void ensure_singleton_there(void)
         {
-            client=std::auto_ptr<Client>(new Client(*conndConn));
+            if (SingletonObject.get() == NULL)
+                SingletonObject=std::auto_ptr<T2nSingletonWrapper>(new T2nSingletonWrapper());
         }
 
         // create an exec-method for each possible number of parameters
@@ -192,21 +202,37 @@ class T2nWrapper
         { \
             boost::function<R(Client*)>(*p)(R(Client::*)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \
                     BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,Arg)) \
-                = &T2nWrapper::template prep<R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,Arg) >; \
+                = &T2nSingletonWrapper::template prep<R BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,Arg) >; \
             return boost::bind \
             ( \
-                T2nWrapper::template real_exec<R>, \
+                T2nSingletonWrapper::template real_exec<R>, \
                 boost::bind( p, f BOOST_PP_COMMA_IF(n) \
                 BOOST_PP_ENUM(n, _GEN_PLACEHOLDER, ~ ) ) \
             ); \
         } // eo exec
 
-        BOOST_PP_REPEAT( BOOST_PP_ADD(T2NWRAPPER_MAX_ARGS,1), _GEN_EXEC, ~ )
+        BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1), _GEN_EXEC, ~ )
 
 #undef _GEN_EXEC
 #undef _GEN_PLACEHOLDER
 
 };
 
+// create an t2n_exec-method for each possible number of parameters
+#define _GEN_EXEC(z,n,d) \
+        template< class Client, typename R  BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n,typename Arg) > \
+        static boost::function< R( BOOST_PP_ENUM_PARAMS(n,Arg) ) > t2n_exec \
+        ( \
+            R(Client::*f)( BOOST_PP_ENUM_PARAMS(n,Arg) ) \
+        ) \
+        { \
+            return T2nSingletonWrapper<Client>::exec(f); \
+        } // eo exec
+
+        BOOST_PP_REPEAT( BOOST_PP_ADD(T2N_SINGLETON_WRAPPER_MAX_ARGS,1), _GEN_EXEC, ~ )
+
+#undef _GEN_EXEC
+#undef _GEN_PLACEHOLDER
+
 }
 #endif
diff --git a/src/command_client.hxx b/src/command_client.hxx
index 035e270..d420102 100644
--- a/src/command_client.hxx
+++ b/src/command_client.hxx
@@ -28,7 +28,7 @@ namespace libt2n
 /// a client sending out commands to a server
 class command_client
 {
-    protected:
+    public:
         static const long long command_timeout_usec_default=90000000;
         static const long long hello_timeout_usec_default=30000000;