Stefano Fago stefanofago73

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Software Designer, I like to build software, a little tormented soul

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stefanofago73 / handler_ecosys_prototype.java

Last active February 3, 2026 14:27



	public interface Handler<I, O> {
	Result<O> handle(I request, ServiceContext context);
	}




	public abstract class DelegatingHandler<I, O> implements Handler<I, O> {

stefanofago73 / SneakyFns.java

Last active January 24, 2026 17:41

This educational example addresses the issue of checked exceptions in the context of lambdas using an approach that transforms the invocation with a checked exception into a functional interface without exceptions. This is possible thanks to MethodHandles and the LambdaMetafactory. It's also used the approach of the sneaky-throw.

	import java.lang.invoke.MethodHandle;
	import java.lang.invoke.MethodHandles;
	import java.lang.invoke.MethodType;
	import java.util.function.Function;

	/**
	*
	* This class was triggered form readyn the post: https://blog.frankel.ch/checked-exceptions-lambdas/
	* Can be done better and works for unary invocation
	*

stefanofago73 / CommonCloudEvents_Extensions.java

Last active January 20, 2026 15:24

This is an attempt to pattern the creation of extensions for the CloudEvents Java SDK. There are limitations, but it could be an accelerator for defining existing CloudEvents extensions, including compatibility with the OPC-UA protocol in the context of the IIOT!

	import java.net.URI;
	import java.time.OffsetDateTime;
	import java.util.LinkedHashMap;
	import java.util.Map;
	import java.util.Objects;
	import java.util.Set;

	import io.cloudevents.CloudEventExtension;
	import io.cloudevents.CloudEventExtensions;
	import io.cloudevents.core.extensions.impl.ExtensionUtils;

stefanofago73 / PlayingWithVarArgs.java

Created December 11, 2025 21:22

This is an example of using var-args, and their definition by the Java compiler as pre-allocated arrays, to simulate in a simple way what is obtained with the Super Type Tokens pattern. Ugly and Raw but... funny enough!

	// ----- ELEMENTS TO DEMONSTRATE THE USAGE
	public interface Tool {
	void use();
	}

	public record Tool1() implements Tool{
	public void use() {
	System.out.println("tool1");
	}
	}

stefanofago73 / TryingSWAR.java

Last active December 3, 2025 10:26

A possible, not optimized, SWAR approach without Vector API, searching for ASCII char

	public class TryingSWAR{

	public final static int[] findCharPositions(String input, byte target) {

	final byte[] bytes = input.getBytes(StandardCharsets.UTF_8);
	final int trail = bytes.length;
	final int[] positions = new int[trail];
	final long pattern = 0x0101010101010101L * (target & 0xFF);
	int i = 0, idx = 0;

stefanofago73 / Problems.java

Created October 11, 2025 08:59

RFC 9457 HTTP Problem Details - Minimal Helper for Spring Boot 2.7.x & C - No dependencies, no libs or frameworks, pure Spring!

	import java.net.URI;
	import java.util.LinkedHashMap;
	import java.util.Map;
	import java.util.Objects;

	import org.springframework.http.HttpHeaders;
	import org.springframework.http.HttpStatus;
	import org.springframework.http.MediaType;
	import org.springframework.http.ResponseEntity;

stefanofago73 / generic_prompting_guide.txt

Created July 17, 2025 21:14

This guide helps you build effective prompts, reusable context blocks, and structured templates for use in ChatGPT or other LLMs.

	# 📘 Prompting Guide & Reusable Prompt Template (Generic)

	This guide helps you build effective prompts, reusable context blocks, and structured templates for use in ChatGPT or other LLMs.

	# =========================================
	# 🎯 GOALS
	# =========================================
	- Create concise, reusable prompts
	- Maintain low token usage
	- Enable restoration of context in future sessions

stefanofago73 / Either.java

Last active April 9, 2025 13:40

A simplistic implementation of the Either functional abstraction but using RuntimeException

	import java.util.Optional;
	import java.util.function.Function;
	import java.util.function.Supplier;

	//
	// The idea is that the RuntimeException is the Left barnch but implicit!
	//
	// Exceptions can be Generic, so the "simulation" is partial...
	// A better implementation can be using a "type" expressed by
	// a Generic Interface that needs to be "instatiated" in the implements moment:

stefanofago73 / OptionalCoMonad.java

Created March 29, 2025 16:37

A possible, minimal, Java Optional CoMonad implementation

	import java.util.Optional;
	import java.util.function.Function;

	public final class OptionalCoMonad<T> {

	private final Optional<T> value;

	private OptionalCoMonad(Optional<T> value) {
	this.value = value;
	}

stefanofago73 / PHP_DSL_Generate_by_ChatGPT.md

Created November 29, 2023 21:25

THE PROMPT

Act as a PHP Senior Software engineer: You master all modern PHP syntax, data structures, and constructs. temp = 0.4

You are provided with an EBFN grammar, as input, defined inside the tags """.

"""
Grammar ::= ( 
 'SINGLE-WORD' |

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