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 // Copyright 2020, Jefferson Science Associates, LLC.
 // Subject to the terms in the LICENSE file found in the top-level directory.
 
 #pragma once
 
 #include <string>
 #include <atomic>
 #include <mutex>
 #include <memory>
 #include <chrono>
 
 class JEventProcessor;
 class JEventSource;
 class JEventSourceGenerator;
 class JFactoryGenerator;
 class JFactorySet;
 class JComponentManager;
 class JPluginLoader;
 class JExecutionEngine;
 class JEventUnfolder;
 class JServiceLocator;
 class JParameter;
 class JParameterManager;
 class JApplication;
 extern JApplication* japp;
 
 #include <JANA/Components/JComponentSummary.h>
 #include <JANA/JLogger.h>
 
 
 //////////////////////////////////////////////////////////////////////////////////////////////////
 /// JANA application class
 ///
 /// The JApplication class serves as a central access point for getting to most things
 /// in the JANA application. It owns the JThreadManager, JParameterManager, etc.
 /// It is also responsible for making sure all of the plugins are attached and other
 /// user specified configurations for the run are implemented before starting the processing
 /// of the data. User code (e.g. plugins) will generally register things like event sources
 /// and processors with the JApplication so they can be called up later at the appropriate time.
 //////////////////////////////////////////////////////////////////////////////////////////////////
 class JApplication {
 
 public:
 
     /// These exit codes are what JANA uses internally. However they are fundamentally a suggestion --
     /// the user code is likely to use arbitrary exit codes.
     enum class ExitCode {Success=0, UnhandledException, Timeout, Segfault=139};
 
     explicit JApplication(JParameterManager* params = nullptr);
     explicit JApplication(JLogger::Level verbosity);
     ~JApplication();
 
 
     // Loading plugins
 
     void AddPlugin(std::string plugin_name);
     void AddPluginPath(std::string path);
 
 
     // Building a JProcessingTopology
 
     void Add(std::string event_source_name);
     void Add(JEventSourceGenerator* source_generator);
     void Add(JFactoryGenerator* factory_generator);
     void Add(JEventSource* event_source);
     void Add(JEventProcessor* processor);
     void Add(JEventUnfolder* unfolder);
 
 
     // Controlling processing
 
     void Initialize(void);
     void Run(bool wait_until_stopped=true, bool finish=true);
     void Scale(int nthreads);
     void Stop(bool wait_until_stopped=false, bool finish=true);
     void Quit(bool skip_join = false);
     void SetExitCode(int exitCode);
     int GetExitCode();
 
     // Performance/status monitoring
     void PrintStatus();
     bool IsInitialized(void){return m_initialized;}
     bool IsQuitting(void) { return m_quitting; }
     bool IsDrainingQueues();
 
     void SetTicker(bool ticker_on = true);
     bool IsTickerEnabled();
     void SetTimeoutEnabled(bool enabled = true);
     bool IsTimeoutEnabled();
     uint64_t GetNThreads();
     uint64_t GetNEventsProcessed();
     float GetIntegratedRate();
     float GetInstantaneousRate();
 
     const JComponentSummary& GetComponentSummary();
 
     // Parameter config
 
     JParameterManager* GetJParameterManager() { return m_params.get(); }
 
     template<typename T>
     T GetParameterValue(std::string name);
 
     template <typename T>
     JParameter* GetParameter(std::string name, T& val);
 
     template<typename T>
     JParameter* SetParameterValue(std::string name, T val);
 
     template <typename T>
     JParameter* SetDefaultParameter(std::string name, T& val, std::string description="");
 
     template <typename T>
     T RegisterParameter(std::string name, const T default_val, std::string description="");
 
     // Locating services
 
     /// Use this in EventSources, Factories, or EventProcessors. Do not call this
     /// from InitPlugin(), as not all JServices may have been loaded yet.
     /// When initializing a Service, use acquire_services() instead.
     template <typename T>
     std::shared_ptr<T> GetService();
 
     /// Call this from InitPlugin.
     template <typename T>
     void ProvideService(std::shared_ptr<T> service);
 
 
 private:
 
     JLogger m_logger;
 
     std::unique_ptr<JServiceLocator> m_service_locator;
 
     std::shared_ptr<JParameterManager> m_params;
     std::shared_ptr<JPluginLoader> m_plugin_loader;
     std::shared_ptr<JComponentManager> m_component_manager;
     std::shared_ptr<JExecutionEngine> m_execution_engine;
 
     bool m_inspect = false;
     bool m_quitting = false;
     bool m_skip_join = false;
     std::atomic_bool m_initialized {false};
     std::atomic_bool m_services_available {false};
     int  m_exit_code = (int) ExitCode::Success;
     int  m_desired_nthreads;
 
     // For instantaneous rate calculations
     std::mutex m_inst_rate_mutex;
     std::chrono::steady_clock::time_point m_last_measurement_time = std::chrono::steady_clock::now();
     size_t m_last_event_count = 0;
 };
 
 
 // This routine is used to bootstrap plugins. It is done outside
 // of the JApplication class to ensure it sees the global variables
 // that the rest of the plugin's InitPlugin routine sees.
 inline void InitJANAPlugin(JApplication* app) {
     // Make sure global pointers are pointing to the
     // same ones being used by executable
     japp = app;
 }
 
 

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