pipeline_element.h

#ifndef _PIPELINE_ELEMENT_H
#define _PIPELINE_ELEMENT_H
/*
 * Fledge filter pipeline elements.
 *
 * Copyright (c) 2024 Dianomic Systems
 *
 * Released under the Apache 2.0 Licence
 *
 * Author: Mark Riddoch
 */
#include <string>
#include <config_category.h>
#include <management_client.h>
#include <plugin.h>
#include <plugin_manager.h>
#include <plugin_data.h>
#include <reading_set.h>
#include <filter_plugin.h>
#include <service_handler.h>
#include <config_handler.h>

class FilterPipeline;

class PipelineElement {
    public:
        PipelineElement() : m_next(NULL), m_storage(NULL) {};
        virtual ~PipelineElement() {};
        void            setNext(PipelineElement *next)
                    {
                        m_next = next;
                    };
        PipelineElement     *getNext()
                    {
                        return m_next;
                    };
        void            setService(const std::string& serviceName)
                    {
                        m_serviceName = serviceName;
                    };
        void            setStorage(StorageClient *storage)
                    {
                        m_storage = storage;
                    };
        static void     ingest(void *handle, READINGSET *readings)
                    {
                            ((PipelineElement *)handle)->ingest(readings);
                    };
        virtual bool        setupConfiguration(ManagementClient * /* mgtClient */,
                        std::vector<std::string>& /* children */)
                    {
                        return false;
                    };
        virtual bool        isFilter()
                        {
                        return false;
                    };
        virtual bool        isBranch()
                        {
                        return false;
                    };
        virtual void        ingest(READINGSET *readingSet) = 0;
        virtual bool        setup(ManagementClient *mgmt, void *ingest, std::map<std::string, PipelineElement*>& categories) = 0;
        virtual bool        init(OUTPUT_HANDLE* outHandle, OUTPUT_STREAM output) = 0;
        virtual void        shutdown(ServiceHandler *serviceHandler, ConfigHandler *configHandler) = 0;
        virtual void        reconfigure(const std::string& /* newConfig */)
                    {
                    };
        virtual std::string getName() = 0;
        virtual bool        isReady() = 0;
    protected:
        std::string     m_serviceName;
        PipelineElement     *m_next;
        StorageClient       *m_storage;

};

class PipelineFilter : public PipelineElement {
    public:
        PipelineFilter(const std::string& name, const ConfigCategory& filterDetails);
        ~PipelineFilter();
        bool            setupConfiguration(ManagementClient *mgtClient, std::vector<std::string>& children);
        void            ingest(READINGSET *readingSet)
                    {
                        if (m_plugin)
                        {
                            m_plugin->ingest(readingSet);
                        }
                        else
                        {
                            Logger::getLogger()->error("Pipeline filter %s has  no plugin associated with it.", m_name.c_str());
                        }
                    };
        bool            setup(ManagementClient *mgmt, void *ingest, std::map<std::string, PipelineElement*>& categories);
        bool            init(OUTPUT_HANDLE* outHandle, OUTPUT_STREAM output);
        void            shutdown(ServiceHandler *serviceHandler, ConfigHandler *configHandler);
        void            reconfigure(const std::string& newConfig);
        bool            isFilter() { return true; };
        std::string     getCategoryName() { return m_categoryName; };
        bool            persistData() { return m_plugin->persistData(); };
        void            setPluginData(PluginData *data) { m_plugin->m_plugin_data = data; };
        std::string     getPluginData() { return m_plugin->m_plugin_data->loadStoredData(m_serviceName + m_name); };
        void            setServiceName(const std::string& name) { m_serviceName = name; };
        std::string     getName() { return m_name; };
        bool            isReady() { return true; };
    private:
        PLUGIN_HANDLE       loadFilterPlugin(const std::string& filterName);
    private:
        std::string     m_name;     // The name of the filter instance
        std::string     m_categoryName;
        std::string     m_pluginName;
        PLUGIN_HANDLE       m_handle;
        FilterPlugin        *m_plugin;
        std::string     m_serviceName;
        ConfigCategory      m_updatedCfg;
};

class PipelineBranch : public PipelineElement {
    public:
        PipelineBranch(FilterPipeline *parent);
        ~PipelineBranch();
        void            ingest(READINGSET *readingSet);
        std::string     getName() { return "Branch"; };
        bool            setupConfiguration(ManagementClient *mgtClient, std::vector<std::string>& children);
        bool            setup(ManagementClient *mgmt, void *ingest, std::map<std::string, PipelineElement*>& categories);
        bool                    init(OUTPUT_HANDLE* outHandle, OUTPUT_STREAM output);
        void                    shutdown(ServiceHandler *serviceHandler, ConfigHandler *configHandler);
        bool                    isReady();
        bool            isBranch()
                    {
                        return true;
                    };
        std::vector<PipelineElement *>& 
                    getBranchElements()
                    {
                        return m_branch;
                    };
        void            setFunctions(void *onward, void *use, void *ingest)
                    {
                        m_passOnward = onward;
                        m_useData = use;
                        m_ingest = ingest;
                    };
    private:
        static void     branchHandler(void *instance);
        void            handler();
    private:
        std::vector<PipelineElement *>      m_branch;
        std::thread             *m_thread;
        std::queue<READINGSET *>        m_queue;
        std::mutex              m_mutex;
        std::condition_variable         m_cv;
        void                    *m_passOnward;
        void                    *m_useData;
        void                    *m_ingest;
        bool                    m_shutdownCalled;
        FilterPipeline              *m_pipeline;
};

class PipelineWriter : public PipelineElement {
    public:
        PipelineWriter();
        void            ingest(READINGSET *readingSet);
        bool            setup(ManagementClient *mgmt, void *ingest, std::map<std::string, PipelineElement*>& categories);
        bool                    init(OUTPUT_HANDLE* outHandle, OUTPUT_STREAM output);
        void                    shutdown(ServiceHandler *serviceHandler, ConfigHandler *configHandler);
        bool                    isReady();
};

#endif