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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;
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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
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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 {
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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);
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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
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 );
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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;
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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
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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");
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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)^(2*k+1)) / (2*k+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]");