src/gromacs/commandline/cmdlineprogramcontext.h

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  36 /*! \file
  37  * \brief
  38  * Declares gmx::CommandLineProgramContext.
  39  *
  40  * This header is installed to support cmdlineinit.h because some compilers
  41  * don't allow returning a reference to an incomplete type from a function.
  42  * It should not be necessary to use gmx::CommandLineProgramContext outside the
  43  * \Gromacs library.
  44  *
  45  * \author Teemu Murtola <teemu.murtola@gmail.com>
  46  * \inlibraryapi
  47  * \ingroup module_commandline
  48  */
  49 #ifndef GMX_COMMANDLINE_CMDLINEPROGRAMCONTEXT_H
  50 #define GMX_COMMANDLINE_CMDLINEPROGRAMCONTEXT_H
  51
  52 #include <memory>
  53 #include <string>
  54 #include <vector>
  55
  56 #include "gromacs/utility/classhelpers.h"
  57 #include "gromacs/utility/programcontext.h"
  58
  59 namespace gmx
  60 {
  61
  62 //! \addtogroup module_commandline
  63 //! \{
  64
  65 /*! \libinternal \brief
  66  * Allows customization of the way various directories are found by
  67  * CommandLineProgramContext.
  68  *
  69  * For the CommandLineProgramContext constructors that do not take this
  70  * interface as a parameter, a default implementation is used that forwards
  71  * the calls to the corresponding methods in gmx::Path.
  72  *
  73  * \inlibraryapi
  74  */
  75 class IExecutableEnvironment
  76 {
  77 public:
  78     virtual ~IExecutableEnvironment() {}
  79
  80     /*! \brief
  81      * Returns the working directory when the program was launched.
  82      */
  83     virtual std::string getWorkingDirectory() const = 0;
  84     /*! \brief
  85      * Returns list of paths where executables are searched for.
  86      *
  87      * The returned list should be in priority order.  An empty string in
  88      * the returned list corresponds to getWorkindDirectory().
  89      */
  90     virtual std::vector<std::string> getExecutablePaths() const = 0;
  91 };
  92
  93 //! Shorthand for a smart pointer to IExecutableEnvironment.
  94 typedef std::unique_ptr<IExecutableEnvironment> ExecutableEnvironmentPointer;
  95
  96 /*! \libinternal \brief
  97  * Program context implementation for command line programs.
  98  *
  99  * Constructors are provided mostly for unit testing purposes; in normal usage,
 100  * a single CommandLineProgramContext object is constructed with
 101  * initForCommandLine() in the beginning of the program.
 102  * The returned object can be explicitly passed to other methods, or accessed
 103  * through getProgramContext().
 104  *
 105  * Unless explicitly noted otherwise, methods in this class may throw
 106  * std::bad_alloc on out-of-memory conditions, but do not throw other
 107  * exceptions.
 108  *
 109  * \inlibraryapi
 110  */
 111 class CommandLineProgramContext : public IProgramContext
 112 {
 113 public:
 114     /*! \brief
 115      * Constructs an empty context object.
 116      *
 117      * All methods in the constructed object return dummy values.
 118      */
 119     CommandLineProgramContext();
 120     /*! \brief
 121      * Initializes a program context object with binary name only.
 122      *
 123      * \param[in] binaryName  Name of the binary.
 124      *
 125      * This is needed for unit testing purposes.
 126      * The constructed object works as if the command line consisted of
 127      * only of the binary name.
 128      */
 129     explicit CommandLineProgramContext(const char* binaryName);
 130     /*! \brief
 131      * Initializes a program context object based on command line.
 132      *
 133      * \param[in] argc  argc value passed to main().
 134      * \param[in] argv  argv array passed to main().
 135      */
 136     CommandLineProgramContext(int argc, const char* const argv[]);
 137     /*! \brief
 138      * Initializes a program context object based on command line.
 139      *
 140      * \param[in] argc  argc value passed to main().
 141      * \param[in] argv  argv array passed to main().
 142      * \param[in] env   Customizes the way the binary name is handled.
 143      *
 144      * This overload allows one to customize the way the binary is located
 145      * by providing a custom IExecutableEnvironment implementation.
 146      * This is mainly useful for testing purposes to make it possible to
 147      * test different paths without setting environment variables, changing
 148      * the working directory or doing other process-wide operations.
 149      * It may also be useful for making Gromacs behave better when linked
 150      * into a non-Gromacs executable (with possible extensions in
 151      * IExecutableEnvironment).
 152      */
 153     CommandLineProgramContext(int argc, const char* const argv[], ExecutableEnvironmentPointer env);
 154     ~CommandLineProgramContext() override;
 155
 156     /*! \brief
 157      * Sets a display name for the binary.
 158      *
 159      * \throws std::bad_alloc if out of memory.
 160      *
 161      * This is used with the wrapper binary to add the name of the invoked
 162      * module to the name of the binary shown.
 163      *
 164      * It is not threadsafe if there are concurrent calls to displayName()
 165      * before this method has returned.  Thread safety is not required for
 166      * the normal initialization sequence of command line programs; it is
 167      * called in the wrapper binary before the control passes to the actual
 168      * module which may create threads.
 169      */
 170     void setDisplayName(const std::string& name);
 171
 172     /*! \brief
 173      * Returns the name of the binary as it was invoked without any path.
 174      *
 175      * Does not throw.
 176      */
 177     const char* programName() const override;
 178     /*! \brief
 179      * Returns a display name of the current module.
 180      *
 181      * The returned value equals programName(), unless a separate display
 182      * name has been set with setDisplayName().
 183      *
 184      * Does not throw.
 185      */
 186     const char* displayName() const override;
 187     /*! \brief
 188      * Returns the full path of the running binary.
 189      *
 190      * \throws std::bad_alloc if out of memory.
 191      * \throws tMPI::system_error on thread synchronization errors.
 192      *
 193      * Returns argv[0] if there was an error in finding the absolute path.
 194      */
 195     const char* fullBinaryPath() const override;
 196     /*! \brief
 197      * Returns the installation prefix (for finding \Gromacs data files).
 198      *
 199      * \throws std::bad_alloc if out of memory.
 200      * \throws tMPI::system_error on thread synchronization errors.
 201      *
 202      * Returns a hardcoded path set during configuration time if there is
 203      * an error in finding the library data files.
 204      */
 205     InstallationPrefixInfo installationPrefix() const override;
 206     /*! \brief
 207      * Returns the full command line used to invoke the binary.
 208      *
 209      * Does not throw.
 210      */
 211     const char* commandLine() const override;
 212
 213 private:
 214     class Impl;
 215
 216     PrivateImplPointer<Impl> impl_;
 217 };
 218
 219 } // namespace gmx
 220
 221 #endif