application_base.hh

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/*
 * aplication_base.hh
 *
 */

#ifndef APPLICATION_BASE_HH_
#define APPLICATION_BASE_HH_


#include <string>
#include <sstream>
#include <mpi.h>

#include "global_defs.h"
#include "system/xio.h"
#include "system/file_path.hh"

#ifdef HAVE_PETSC
#include "petsc.h"
#endif

using namespace std;



/**
 * Base virtual class of Flow123D application.
 *
 * Contains base methods of application for initialization, run and finalization which is used in derived class.
 *
 * Usage:
 @code
 class Application : public ApplicationBase {
 public:
   Application(int argc, char ** argv); // constructor
 protected:
   virtual void run(); // implementation of pure virtual method
   virtual void after_run(); // overriding of parent method
 }
 @endcode
 *
 */
class ApplicationBase {
public:

    /**
     * Contains basic structure of application (initialization, run and finalization).
     * Method is call after constructor and allows to call virtual methods.
     */
    void init(int argc, char ** argv);

    /// Return codes of application
    static const int exit_success = 0;
    static const int exit_failure = 1;
    static const int exit_output = 0;   //return code if printout (text, JSON or LaTeX) is run

    static bool petsc_initialized;

protected:

    /**
     * Constructor
     *
     * Construction is done in init method. We need to call virtual methods during construction.
     */
    ApplicationBase(int argc,  char ** argv);

    /// Destructor
    virtual ~ApplicationBase();

    /**
     * Run application.
     *
     * Method must be implemented in derived class.
     */
    virtual void run() = 0;

    /**
     * Read system parameters, open log.
     */
    void system_init( MPI_Comm comm, const string &log_filename);

    /**
     * Parse command line parameters before Flow123D initialization.
     *
     * Method can be override in derived class.
     */
    virtual void parse_cmd_line(const int argc, char ** argv) {}

    /**
     * Implement printf function for PETSc with support for redirecting.
     */
#ifdef HAVE_PETSC
    static PetscErrorCode petscvfprintf(FILE *fd, const char format[], va_list Argp);
#endif

    /**
     * Initialize PETSC.
     */
    void petsc_initialize(int argc, char ** argv);

    /**
     * Finalize PETSC. If finalization failed return nonzero value.
     */
    int petcs_finalize();

    /**
     * Execute part of program after run of simulation.
     *
     * Method can be override in derived class.
     */
    virtual void after_run() {}

    /**
     * Log file name argument - passed to system_init; "" means default, "\n" means no logging
     * TODO: move whole system_init into Application, use singleton for some runtime global options
     * for the Flow123d library.
     */
    string log_filename_;

    ///  Optional file name for output of PETSc parameters.
    ///  Has to be set in @p parse_cmd_line()
    string petsc_redirect_file_="";

    /// File handler for redirecting PETSc output
    static FILE *petsc_output_;
};

#endif /* APPLICATION_BASE_HH_ */