CODESAMPLE

Microkernel - C++

Microkernel C++

The Microkernel pattern structures an application as a core system (the microkernel) and plugin modules. The microkernel provides minimal essential services, while plugins add specific functionality. This promotes modularity, extensibility, and isolation. The provided code demonstrates a simple microkernel for processing strings. The core Microkernel class defines an interface for plugins (IPlugin). UppercasePlugin and LowercasePlugin implement the interface to transform strings. The microkernel loads and executes these plugins based on configuration. This implementation leverages polymorphism via the IPlugin base class, common in C++ to achieve extensibility. Dependency injection through the plugin list is also used, a modern C++ practice.

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>

// Plugin Interface
class IPlugin {
public:
    virtual std::string process(const std::string& data) = 0;
    virtual ~IPlugin() = default;
};

// Uppercase Plugin
class UppercasePlugin : public IPlugin {
public:
    std::string process(const std::string& data) override {
        std::string result = data;
        std::transform(result.begin(), result.end(), result.begin(), ::toupper);
        return result;
    }
};

// Lowercase Plugin
class LowercasePlugin : public IPlugin {
public:
    std::string process(const std::string& data) override {
        std::string result = data;
        std::transform(result.begin(), result.end(), result.begin(), ::tolower);
        return result;
    }
};

// Microkernel
class Microkernel {
public:
    Microkernel(std::vector<IPlugin*> plugins) : plugins_(std::move(plugins)) {}

    std::string processData(const std::string& data) {
        std::string processedData = data;
        for (auto* plugin : plugins_) {
            processedData = plugin->process(processedData);
        }
        return processedData;
    }

private:
    std::vector<IPlugin*> plugins_;
};

int main() {
    // Load plugins (in a real system this might be done dynamically)
    UppercasePlugin uppercasePlugin;
    LowercasePlugin lowercasePlugin;

    std::vector<IPlugin*> plugins = {&uppercasePlugin, &lowercasePlugin};

    // Create microkernel with plugins
    Microkernel microkernel(std::move(plugins));

    // Process data
    std::string data = "Hello World";
    std::string processedData = microkernel.processData(data);

    std::cout << "Original Data: " << data << std::endl;
    std::cout << "Processed Data: " << processedData << std::endl;

    return 0;
}