I extended my previous example: Segmentation fault (core dumped) on Server side in CORBA C++/Java application which I finally finished with help of Stack's user, @Brian Neal.
Im still a newbie in Corba so I wanted to get to know some more about sequences in Corba and I wrote this simple (?) example:
interface Task
{
string getThingToDo();
};
#include "Task.idl"
interface Employee
{
typedef sequence <Task> tasks;
string getLastname();
Task getTask(in short id);
};
#include "Employee.idl"
interface Work
{
Employee getEmployee(in short id);
};
TaskImpl.h and TaskImpl.cpp:
#include "Task.hh"
class TaskImpl : public POA_Task
{
private:
CORBA::String_var thingToDo;
public:
TaskImpl(const char* thingToDo);
char* getThingToDo();
};
#include "TaskImpl.h"
TaskImpl::TaskImpl(const char* thingToDo)
{
this->thingToDo = CORBA::string_dup(thingToDo);
}
char* TaskImpl::getThingToDo()
{
return CORBA::string_dup(this->thingToDo.in());
}
EmployeeImpl.h and EmployeeImpl.cpp:
#include "Employee.hh"
#include "TaskImpl.h"
class EmployeeImpl : public POA_Employee
{
private:
CORBA::String_var lastname;
int id;
Employee::tasks thingsToDo;
public:
EmployeeImpl(const char* lastname, int id);
char* getLastname();
Task_ptr getTask(::CORBA::Short id);
};
#include "EmployeeImpl.h"
EmployeeImpl::EmployeeImpl(const char* lastname, int id)
{
this->lastname = CORBA::string_dup(lastname);
this->id = id;
this->thingsToDo.length(3);
TaskImpl *t1, *t2, *t3;
t1 = new TaskImpl("Print all the documents");
t2 = new TaskImpl("Write the report");
t3 = new TaskImpl("Make backup");
this->thingsToDo[0] = Task::_duplicate(t1->_this());
this->thingsToDo[1] = Task::_duplicate(t2->_this());
this->thingsToDo[2] = Task::_duplicate(t3->_this());
}
char* EmployeeImpl::getLastname()
{
return CORBA::string_dup(this->lastname.in());
}
Task_ptr EmployeeImpl::getTask(::CORBA::Short id)
{
return this->thingsToDo[id-1]._retn();
}
WorkImpl.h and WorkImpl.cpp:
#include "Work.hh"
#include <vector>
#include "EmployeeImpl.h"
using namespace std;
class WorkImpl : public POA_Work
{
private:
vector<EmployeeImpl> employees;
public:
WorkImpl();
Employee_ptr getEmployee(::CORBA::Short id);
};
#include "WorkImpl.h"
WorkImpl::WorkImpl()
{
EmployeeImpl ei1(CORBA::string_dup("Doe"), 1);
EmployeeImpl ei2(CORBA::string_dup("Smith"), 2);
EmployeeImpl ei3(CORBA::string_dup("Brown"), 3);
employees.push_back(ei1);
employees.push_back(ei2);
employees.push_back(ei3);
}
Employee_ptr WorkImpl::getEmployee(::CORBA::Short id)
{
return employees[id]._this();
}
Server.cpp:
#include "WorkImpl.h"
#include <omniORB4/CORBA.h>
#include <omniORB4/Naming.hh>
#include <iostream>
using std::cout;
using std::cerr;
int main(int argc, char **argv)
{
try
{
CORBA::ORB_ptr serverORB = CORBA::ORB_init(argc, argv);
CORBA::Object_var myPOAObj = serverORB->resolve_initial_references("RootPOA");
PortableServer::POA_var myPOA = PortableServer::POA::_narrow(myPOAObj);
PortableServer::POAManager_var myManager = myPOA->the_POAManager();
myManager->activate();
WorkImpl *work = new WorkImpl();
try
{
CORBA::Object_var nameServiceObj = serverORB->resolve_initial_references("NameService");
if(!CORBA::is_nil(nameServiceObj))
{
CosNaming::NamingContext_ptr namingContext = CosNaming::NamingContext::_narrow(nameServiceObj);
CosNaming::Name serviceName;
serviceName.length(1);
serviceName[0].id = CORBA::string_dup("WorkService");
namingContext->rebind(serviceName, work->_this());
cout << "WorkService is running ...\n";
}
}catch(CosNaming::NamingContext::NotFound&){
cerr << "CosNaming::NamingContext::NotFound\n";
}catch(CosNaming::NamingContext::InvalidName&){
cerr << "CosNaming::NamingContext::InvalidName\n";
}catch(CosNaming::NamingContext::CannotProceed&){
cerr << "CosNaming::NamingContext::CannotProceed\n";
}
serverORB->run();
delete work;
serverORB->destroy();
}catch(CORBA::SystemException&){
cerr << "Caught CORBA::SystemException\n";
}catch(CORBA::Exception&){
cerr << "Caught CORBA::Exception \n";
}catch(omniORB::fatalException &fe){
cerr << "Caught omniORB::fatalException\n";
cerr << "File: " << fe.file() << "\n";
cerr << "Line: " << fe.line() << "\n";
cerr << "Msg: " << fe.errmsg() << "\n";
}catch(...){
cerr << "Caught unknown exception\n";
}
return 0;
}
Client.java:
package OtherPackage;
import java.util.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import java.io.*;
public class Client
{
public static void main(String [] args)
{
try
{
org.omg.CORBA.ORB clientORB = org.omg.CORBA.ORB.init(args, null);
if (clientORB == null)
{
System.out.println("Problem while creating ORB");
System.exit(1);
}
org.omg.CORBA.Object objRef = clientORB.resolve_initial_references("NameService");
NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
Work work = WorkHelper.narrow(ncRef.resolve_str("WorkService"));
Employee e = work.getEmployee((short)1);
System.out.println(e.getLastname());
Task t = e.getTask();
System.out.println(t.getThingToDo((short)2));
System.out.println(work.getEmployee((short)2).getThingToDo((short)1));
}catch(Exception e){ System.out.println(e.getMessage()); }
}
}
When I try to compile my client, Im getting an error:
Client.java:29: getTask(short) in OtherPackage.EmployeeOperations cannot be applied to ()
Task t = e.getTask();
^
Client.java:30: getThingToDo() in OtherPackage.TaskOperations cannot be applied to (short)
System.out.println(t.getThingToDo((short)2));
^
2 errors
What's wrong? Is that possible to wite it like that?
Some commands I used:
Compile (and run) server files (just copy and paste):
g++ -c *.cpp -I$OMNIORB_HOME/include -I$OMNIORB_HOME/include/omniORB4
g++ -c *.cc -I$OMNIORB_HOME/include -I$OMNIORB_HOME/include/omniORB4
g++ -o Server Server.o EmployeeSK.o WorkSK.o WorkImpl.o EmployeeImpl.o TaskImpl.o TaskSK.o -L$OMNIORB_HOME/lib -lomnithread -lomniORB4
./Server -ORBInitRef NameService=corbaloc::localhost:2809/NameService
Compile (and run) client files (just copy and paste):
cd EmployeePackage; javac -cp .. *.java
cd OtherPackage; javac -cp .. *.java
My whole example: http://www21.zippyshare.com/v/95586459/file.html
You defined getTask to take a short id parameter:
Task getTask(in short id);
You, however, attempted to call it without any arguments:
Task t = e.getTask();
The other error is very similar in nature. You defined getThingToDo to have any empty parameter list:
string getThingToDo();
... and, again, you attempted to call it with incorrect arguments; in this case you attempted to pass a short:
System.out.println(t.getThingToDo((short)2));
I advise you instead try to as follows, which I believe accomplishes what you intended:
final Task t = e.getTask((short) 2);
System.out.println(t.getThingToDo());
... which should print the description of the second employee's second task, i.e. "Write the report". Remember that std::vector is zero-indexed.