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steveash / Orderings.cs
Created November 21, 2016 22:31
Generate all total orderings of (a) an unordered set of events with (b) an ordered list of events.
public static IEnumerable<List<T>> AllOrderings<T>(List<T> unordered, List<T> ordered)
if (unordered.Count == 0)
yield return ordered;
foreach (var permutation in GetPermutations(unordered, unordered.Count))
steveash / gist:3da817c58b47d324d074dfe0227d475b
Created November 5, 2016 15:39
c++11 quick reminder on lvalue/rvalue and move vs copy
// given a temp object like this:
class Temp
Temp() : idx(0), good(true)
AL_INFO << "Temp zero-argo ctor " << idx;
steveash /
Last active February 17, 2023 23:05
Pseudo-random generator that doesn't repeat integers
import java.util.Random;
* Generates a sequence of pseudo-random numbers such that they never repeat. Can handle sequence sizes up to
* length Int.MAX_VALUE. Will throw exceptions if you ask for more than that; maps the entire [0, Integer.MAX_VALUE]
* range onto itself but in a random order
* <link></link>
public class PreshingRandomSequence {
public static final int MAX_INT_PRIME = 2147483587;
steveash /
Created August 6, 2015 23:33
Class to do streaming count, mean, standard deviation allows replacements of particular values from the data population
* Class that allows for streaming collection of count, mean, stddev
* Allows combining multiple independent instances
* Allows _replacement_ of values in the stream (i.e. if one of the values of your data population changes
* you can replace it). Replacing values introduces some tiny error, but in testing that error is < 1e-9 even
* in extreme conditions.
public class StreamStats {
private long count = 0;
steveash / 00_input.conf
Last active May 6, 2022 03:41
ELK configuration for aggregating cassandra and spark logs
input {
lumberjack {
# The port to listen on
port => 5043
# The paths to your ssl cert and key
ssl_certificate => "/etc/pki/tls/certs/logstash-forwarder/logstash-forwarder.crt"
ssl_key => "/etc/pki/tls/private/logstash-forwarder/logstash-forwarder.key"
# default type, but this will already be set by logstash-forwarder anyways
steveash /
Created December 12, 2014 04:58
Simple Brainfuck interpreter for a friend
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class Brainfuck {
public static void main(String[] args) throws IOException {
int maxTapeSize = 10000;
steveash / gist:9879696
Created March 30, 2014 21:00
Sample ehcache manager bean factory
public class CacheBeans {
private static final AtomicInteger cacheCounter = new AtomicInteger(0);
public EhCacheManagerFactoryBean ecmfb() {
EhCacheManagerFactoryBean ecmfb = new EhCacheManagerFactoryBean();
// cannot share the cache managers
steveash /
Last active August 29, 2015 13:57
PrepareAspectJTestExecutionListener resets the AnnotationTransactionAspect to point to the correct bean factory and platform transaction manager before execution
package com.github.steveash.gist;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.TestContext;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.aspectj.AnnotationTransactionAspect;
* Test Execution Listener that resets the references to the Annotation Transaction Aspect's
steveash /
Last active May 2, 2022 15:16
This is an implementation of Optimal String Alignment in Java with some tricks and optimizations. OSA is similar to Damerau–Levenshtein edit distance in that insertions, deletions, substitutions, and transpositions of adjacent are all treated as one edit operation. This OSA implementation also takes a "max edit" threshold, which allows you to sk…
package com.github.steveash.util;
import static;
import static;
import static;
import static java.lang.Math.abs;
import static java.lang.Math.max;
import java.util.Arrays;