CODESAMPLE

Microkernel - Java

Microkernel Java

The Microkernel pattern aims to build a system with a minimal core (the microkernel) and extend functionality through plugins or extensions. This promotes modularity, flexibility, and easier maintenance. The core handles essential, unchanging functionality, while plugins provide optional features.

This Java example demonstrates a simple text processing microkernel. The Microkernel class provides the core functionality – loading and managing plugins. Plugin is an interface that all plugins must implement. UpperCasePlugin and RemoveWhitespacePlugin are example plugins. The implementation uses interfaces for loose coupling, a common Java practice. Plugins are dynamically loaded and executed, showcasing the extensibility of the microkernel architecture. This approach avoids a monolithic codebase and allows for independent plugin development and deployment.

 // Microkernel.java
 import java.util.ArrayList;
 import java.util.List;
 
 public class Microkernel {
  private List<Plugin> plugins = new ArrayList<>();
 
  public void load(Plugin plugin) {
  plugins.add(plugin);
  }
 
  public String process(String data) {
  for (Plugin plugin : plugins) {
  data = plugin.process(data);
  }
  return data;
  }
 }
 
 // Plugin.java
 public interface Plugin {
  String process(String data);
 }
 
 // UpperCasePlugin.java
 public class UpperCasePlugin implements Plugin {
  @Override
  public String process(String data) {
  return data.toUpperCase();
  }
 }
 
 // RemoveWhitespacePlugin.java
 public class RemoveWhitespacePlugin implements Plugin {
  @Override
  public String process(String data) {
  return data.replaceAll("\\s+", "");
  }
 }
 
 // Main.java
 public class Main {
  public static void main(String[] args) {
  Microkernel kernel = new Microkernel();
  kernel.load(new UpperCasePlugin());
  kernel.load(new RemoveWhitespacePlugin());
 
  String input = "  hello world  ";
  String output = kernel.process(input);
  System.out.println("Input: " + input);
  System.out.println("Output: " + output); // Output: HELLOWORLD
  }
 }