Writing and Compiling a Server in Software

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33 Writing and Compiling a Server
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The source code for the entire server takes only a few lines:
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#include <timeh> #include <iostreamh> #include "timeShh" class Time_impl : public virtual POA_Time { public: virtual TimeOfDay get_gmt() throw(CORBA::SystemException); }; TimeOfDay Time_impl:: get_gmt() throw(CORBA::SystemException) {
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time_t time_now = time(0); struct tm * time_p = gmtime(&time_now); TimeOfDay tod; todhour = time_p->tm_hour; todminute = time_p->tm_min; todsecond = time_p->tm_sec; } return tod;
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int main(int argc, char * argv[]) { try { // Initialize orb CORBA::ORB_var orb = CORBA::ORB_init(argc, argv); // Get reference to Root POA CORBA::Object_var obj = orb->resolve_initial_references("RootPOA"); PortableServer::POA_var poa = PortableServer::POA::_narrow(obj); // Activate POA manager PortableServer::POAManager_var mgr = poa->the_POAManager(); mgr->activate(); // Create an object Time_impl time_servant; // Write its stringified reference to stdout Time_var tm = time_servant_this(); CORBA::String_var str = orb->object_to_string(tm); cout < str < endl; // Accept requests orb->run();
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} catch (const CORBA::Exception &) { cerr < "Uncaught CORBA exception" < endl; return 1; } return 0;
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The server implements one Time object The timeShh header file contains an abstract base class called POA_Time Its definition looks like this (tidied up a little to get rid of code that is irrelevant to the application):
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// In file timeShh: class POA_Time : public virtual PortableServer::ServantBase {
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public: virtual Time_ptr virtual TimeOfDay };
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~POA_Time(); _this(); get_gmt() throw(CORBA::SystemException) = 0;
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Note that this class contains a get_gmt pure virtual method To create an implementation object that clients can call, we must derive a concrete class from POA_Time that provides an implementation for the get_gmt method This means that the first few lines of our server program look like this:
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#include <timeh> #include <iostreamh> #include "timeShh" class Time_impl : public virtual POA_Time { public: virtual TimeOfDay get_gmt() throw(CORBA::SystemException); };
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Here, we define a class Time_impl that inherits from POA_Time This class provides a concrete implementation of a Time object that clients actually can communicate with Our implementation class is very simple It has only the single method get_gmt (which is not pure virtual because we require a concrete class that can actually be instantiated) The next step is to implement the get_gmt method of Time_impl For now, we are ignoring error conditions If the call to time fails with a return value of -1, get_gmt returns a garbage time value instead of raising an exception (We discuss how to deal with errors in s 7 and 9)
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TimeOfDay Time_impl:: get_gmt() throw(CORBA::SystemException) { time_t time_now = time(0); struct tm * time_p = gmtime(&time_now); TimeOfDay tod; todhour = time_p->tm_hour; todminute = time_p->tm_min; todsecond = time_p->tm_sec; } return tod;
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This completes the object implementation What remains is to provide a main function for the server The first few lines are identical for most servers and initialize the serverside ORB run time:
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main(int argc, char * argv[]) { try { // Initialize orb CORBA::ORB_var orb = CORBA::ORB_init(argc, argv); // Get reference to Root POA CORBA::Object_var obj = orb->resolve_initial_references("RootPOA"); PortableServer::POA_var poa = PortableServer::POA::_narrow(obj); // Activate POA manager PortableServer::POAManager_var mgr = poa->the_POAManager(); mgr->activate();
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Do not be concerned about the details of this code for the moment we will discuss its precise purpose in later chapters The next step is to provide an actual servant for a Time object so that clients can send invocations to it We do this by creating an instance of the Time_impl servant class:
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// Create a Time object Time_impl time_servant;
For the client to be able to access the object, the client requires an object reference In this simple example, we provide that reference by writing it as a string to stdout Of course, this is not a distributed solution, but it will suffice for now:
// Write a stringified reference // for the Time object to stdout Time_var tm = time_servant_this(); CORBA::String_var str = orb->object_to_string(tm); cout < str < endl;
The call to _this creates an object reference for the object, and object_to_string converts that reference into a printable string At this point we have a concrete implementation of a Time object whose reference is available to the client The server is now ready to accept requests, something that it indicates to the ORB run time by calling run:
// Accept requests orb->run();