dynamic_module.h

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#ifndef CYCLUS_SRC_DYNAMIC_MODULE_H_
#define CYCLUS_SRC_DYNAMIC_MODULE_H_
 
#include <string>
#include <map>
 
#include "error.h"
 
// for testing
class SimInitTest;
 
namespace cyclus {
 
class Agent;
class Context;
 
typedef Agent* AgentCtor(Context*);
 
class InfileTree;
 
class AgentSpec {
 public:
  AgentSpec() {}
  AgentSpec(InfileTree* t);
  AgentSpec(std::string path, std::string lib, std::string agent,
            std::string alias);
  AgentSpec(std::string str_spec);
 
  std::string Sanitize();
  std::string LibPath();
  std::string str();
 
  std::string path() { return path_; }
  std::string lib() { return lib_; }
  std::string agent() { return agent_; }
  std::string alias() { return alias_; }
 
 private:
  std::string path_;
  std::string lib_;
  std::string agent_;
  std::string alias_;
};
 
std::string SanitizeSpec(std::string module_spec);
 
std::string ModuleConstructor(std::string module_spec);
 
class DynamicModule {
 public:
  /// Convenience class for using a stack variable to auto-destruct all loaded
  /// dynamic modules.
  class Closer {
   public:
    ~Closer() { CloseAll(); }
  };
 
  /// Do-nothing constructor
  DynamicModule(){};
 
  /// Returns a newly constructed agent for the given module spec.
  static Agent* Make(Context* ctx, AgentSpec spec);
 
  /// Tests that an agent spec really exists.
  static bool Exists(AgentSpec spec);
 
  /// Closes all statically loaded dynamic modules. This should always be called
  /// before process termination.  This must be called AFTER all agents have
  /// been destructed.
  static void CloseAll();
 
  /// Tests that an agent spec is for a Python Agent. This will also return
  /// false if the agent doesn't already exist.
  static bool IsPyAgent(AgentSpec spec);
 
  /// The path to the module's shared object library.
  std::string path();
 
 private:
  /// Creates a new dynamically loadable module.
  /// @param name the name of the module
  DynamicModule(AgentSpec spec);
 
  /// construct an instance of this module
  /// @return a fresh instance
  Agent* ConstructInstance(Context* ctx);
 
  /// closes the loaded module dynamic lib
  void CloseLibrary();
 
  /// all dynamically loaded modules are
  /// added to this map when loaded.
  static std::map<std::string, DynamicModule*> modules_;
 
  /// for testing - see sim_init_tests
  friend class ::SimInitTest;
  static std::map<std::string, AgentCtor*> man_ctors_;
 
  /// the name of the module
  std::string path_;
 
  /// the name of the module
  std::string ctor_name_;
 
  /// the library to open and close
  void* module_library_;
 
  /// a functor for the constructor
  AgentCtor* ctor_;
 
  /// uses dlopen to open the module shared lib
  void OpenLibrary();
 
  /// sets the constructor member
  void SetConstructor();
};
 
}  // namespace cyclus
 
#endif  // CYCLUS_SRC_DYNAMIC_MODULE_H_