Fabio Lima fabiolimace

fabiolimace / MySimpleHash.java

Last active October 31, 2021 03:48

A simple hash using CRC32 and Adler32 in Java

	package com.example;

	import java.util.zip.Adler32;
	import java.util.zip.CRC32;

	public class MySimpleHash {

	/**
	* Calculate a 64 bits hash by combining CRC32 with Adler32.
	*

fabiolimace / my_simple_hash.py

Created October 31, 2021 03:46

A simple hash using CRC32 and Adler32 in Python

	#!/usr/bin/python3

	import zlib

	def get_hash(bytes):
	return zlib.crc32(bytes) << 32 \| zlib.adler32(bytes)

	string = "This is a test string"
	hash = get_hash(string.encode())
	print("output:", hash)

fabiolimace / UUIDv3WithNamespace1.java

Created November 1, 2021 09:10

UUID v3 with namespace in Java (examples)

	package com.example;

	import java.nio.ByteBuffer;

	import java.nio.charset.StandardCharsets;
	import java.util.UUID;

	public class UUIDv3WithNamespace1 {

	/**

fabiolimace / LessBlockingFactory.java

Last active November 7, 2021 05:20

A non-blocking factory that wraps an array of time-based UUID factories

	package com.github.f4b6a3.uuid.factory;

	import java.security.SecureRandom;
	import java.util.UUID;
	import java.util.function.Supplier;

	import com.github.f4b6a3.uuid.enums.UuidVersion;
	import com.github.f4b6a3.uuid.factory.function.impl.DefaultRandomFunction;
	import com.github.f4b6a3.uuid.factory.nonstandard.PrefixCombFactory;
	import com.github.f4b6a3.uuid.factory.rfc4122.RandomBasedFactory;

fabiolimace / UploadVersion.java

Last active November 7, 2021 04:39

A utility that generates time-based UUIDs for uploaded files

	package com.example;

	import java.nio.ByteBuffer;
	import java.nio.charset.StandardCharsets;
	import java.security.MessageDigest;
	import java.security.NoSuchAlgorithmException;
	import java.time.Instant;
	import java.util.UUID;

	import com.github.f4b6a3.uuid.UuidCreator;

fabiolimace / java.md

Last active December 12, 2021 09:52

Java

Java sites

fabiolimace / README.md

Created December 9, 2021 04:07

Benchmark to compare a fixed pool of SecureRandom to a thread local of SecureRandom in Java

How to prepare the benchmark files on Linux:

BASE="bench"

mkdir $BASE
cp run.sh $BASE/
cp run.bat $BASE/
cp pom.xml $BASE/
cp README.md $BASE/

fabiolimace / Docker.md

Last active December 9, 2021 10:42

Docker

Java support

fabiolimace / README.md

Last active December 9, 2021 08:10

Benchmark to compare `UUID.randomUUID()`, `UuidCreator.getRandomBased()` and others using 4 threads in Java

How to prepare the benchmark files on Linux:

BASE="bench"

mkdir $BASE
cp run.sh $BASE/
cp run.bat $BASE/
cp pom.xml $BASE/
cp README.md $BASE/

fabiolimace / Design Patterns.md

Last active December 12, 2021 09:53