thinkbigthings’s gists

thinkbigthings / Downloader.java

Last active September 21, 2023 09:23

	import java.io.IOException;
	import java.net.URI;
	import java.net.URISyntaxException;
	import java.net.http.HttpClient;
	import java.net.http.HttpRequest;
	import java.nio.file.Files;
	import java.nio.file.Path;
	import java.nio.file.Paths;
	import java.time.LocalDateTime;
	import java.util.Base64;

thinkbigthings / Logout.txt

Last active July 28, 2020 09:41

Get other users' sessions (as admin) to log them out in Spring Security

	With sessions it might be necessary to logout on password change. Also the Logout button from UI should additionally logout on the server.

	https://stackoverflow.com/questions/44359792/log-out-user-by-admin-spring-security

	https://docs.spring.io/spring-security/site/docs/current/reference/html5/#jc-logout



	// in WebSecurityConfigurerAdapter

thinkbigthings / Functional.java

Created July 28, 2020 09:31

Some functional utilities in Java

	public class Functional {

	@FunctionalInterface
	public interface CheckedFunction<T, R> {
	R apply(T t) throws Exception;
	}

	public static <T, R> Function<T, R> uncheck(CheckedFunction<T, R> checkedFunction) {
	return t -> {
	try {

thinkbigthings / randomList.jsh

Last active January 13, 2019 16:21

	import static java.util.stream.IntStream.rangeClosed;
	import static java.util.stream.Collectors.toCollection;

	List<Integer> randomList(int firstInclusive, int lastInclusive) {
	List<Integer> numbers = rangeClosed(firstInclusive, lastInclusive).boxed().collect(toCollection(()->new ArrayList<Integer>()));
	java.util.Collections.shuffle(numbers, new java.security.SecureRandom());
	return numbers;
	}

	// usage: randomList(1,10);

thinkbigthings / canvas.html

Last active March 20, 2018 11:44

plot lots of points on a canvas using real-to-screen coordinate transformation

	<!DOCTYPE html>
	<html>
	<body>

	<canvas id="myCanvas" width="1000" height="500" style="border:1px solid #000000;">
	Your browser does not support the HTML5 canvas tag.
	</canvas>
	<script>

thinkbigthings / fastMath.js

Created March 13, 2018 11:26

	// Math.max overflows if array is too big, use reduce instead
	const fastMin = (array) => array.reduce( (a,b) => (a < b) ? a : b );
	const fastMax = (array) => array.reduce( (a,b) => (a > b) ? a : b );

thinkbigthings / VariableDepthCopier.java

Last active August 20, 2019 12:27

Handy utility for copying domain objects into a response.

	import java.beans.PropertyDescriptor;
	import java.lang.reflect.Field;
	import java.lang.reflect.InvocationTargetException;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.LinkedList;
	import java.util.List;
	import org.springframework.beans.BeanUtils;

thinkbigthings / Vagrantfile

Last active December 16, 2015 02:29

Starter vagrant file that creates a machine with Java and MySQL

	# -- mode: ruby --
	# vi: set ft=ruby :


	$script = <<SCRIPT

	export DEBIAN_FRONTEND=noninteractive

	apt-get -q -y update
	apt-get -q -y install emacs

thinkbigthings / HibernateUnproxifier.java

Created March 12, 2013 10:24

How to get the entity behind a Hibernate proxy

	import org.hibernate.Hibernate;
	import org.hibernate.proxy.HibernateProxy;

	public class HibernateUnproxifier<T> {

	@SuppressWarnings("unchecked")
	public T unproxy(T entity) {

	if (entity == null) {
	throw new NullPointerException("Entity passed for initialization is null");

thinkbigthings / zee summation

Last active December 13, 2015 21:58

	Map<String,String> eqs = new HashMap<String,String>();
	eqs.put("piApprox(k)","8*cumsum(ChebyshevTerm(k))");
	eqs.put("ChebyshevTerm(k)","( (-1)^k * (sqrt(2)-1)^(2k+1)) / (2k+1)");
	eqs.put("absError(k)", "abs(pi-piApprox)");
	EquationProcessor k = new EquationProcessor(eqs);

	Map<String,String> defs = new HashMap<String,String>();
	defs.put("k","[0:20]");

Jason Young thinkbigthings