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KlausBrunner / SimpleFuture.java
Created Nov 19, 2012
A very simple implementation of the Java Future interface, for passing a single value to some waiting thread. Uses a CountdownLatch to ensure thread safety and provide blocking-with-timeout functionality required by Future. Cancellation isn't supported.
View SimpleFuture.java
public final class ResultFuture implements Future<Result> {
private final CountDownLatch latch = new CountDownLatch(1);
private Result value;
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return false;
}
@Override
@KlausBrunner
KlausBrunner / counters.cql
Created Nov 20, 2012
creating and using a Cassandra counter column in CQL
View counters.cql
-- creating and using a Cassandra counter column in CQL
-- NOTE: this is CQL 2.0 syntax, it will NOT work with CQL 3 (for syntax reasons and because CQL 3.0 drops the very notion of dynamic columns...sigh)
CREATE KEYSPACE test WITH strategy_class = 'SimpleStrategy'
AND strategy_options:replication_factor = '1';
USE test;
CREATE TABLE stats (KEY text PRIMARY KEY) WITH comparator=text AND default_validation=counter;
@KlausBrunner
KlausBrunner / sshd_config
Last active Apr 13, 2020
Minimal, secure sshd_config (OpenSSH 8.2)
View sshd_config
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
HostKey /etc/ssh/ssh_host_ed25519_key
HostKey /etc/ssh/ssh_host_rsa_key
ChallengeResponseAuthentication no
UsePAM yes
# Allow client to pass locale environment variables
@KlausBrunner
KlausBrunner / two-main-jars-pom.xml
Last active Feb 2, 2020
Creating two different executable JARs with dependencies from the same Maven project - same contents but different Main class in the manifest
View two-main-jars-pom.xml
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<id>make-assembly1</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
@KlausBrunner
KlausBrunner / hexdump.java
Created Dec 10, 2019
Java byte array to hexdump. Format similar to default of hexdump(1).
View hexdump.java
static String hexDump(byte[] bytes) {
Formatter format = new Formatter(new StringBuilder());
for (int j = 0; j < bytes.length; j++) {
if (j % 16 == 0) {
format.format((j > 0 ? "\n" : "") + "%08X ", j);
}
format.format("%02X ", bytes[j]);
}
return format.toString();
}
@KlausBrunner
KlausBrunner / parent-from-existing.py
Created Aug 12, 2019
Generate a basic parent POM from all subfolders that contain Maven projects.
View parent-from-existing.py
#!/usr/bin/env python3
import os
import argparse
parser = argparse.ArgumentParser(description='Generate a Maven parent pom for existing Maven projects in a folder.')
parser.add_argument('root', default='.', nargs='?',
help='root (parent) folder')
parser.add_argument('--group', default='localhost',
help='groupId for parent POM')
@KlausBrunner
KlausBrunner / hls-distances.html
Created Mar 21, 2019
Trivial example to calculate route distances from a fixed point to location(s) specified as user input, using HERE Location Services.
View hls-distances.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="http://js.api.here.com/v3/3.0/mapsjs-core.js" type="text/javascript" charset="utf-8"></script>
<script src="http://js.api.here.com/v3/3.0/mapsjs-service.js" type="text/javascript" charset="utf-8"></script>
</head>
@KlausBrunner
KlausBrunner / gerrit-ssh.py
Created Dec 10, 2015
Accessing the gerrit SSH interface using Python (via ssh config entry)
View gerrit-ssh.py
#!/usr/bin/env python
import paramiko
import sys
import os
client = paramiko.SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
config = paramiko.SSHConfig()
@KlausBrunner
KlausBrunner / wars-dist.xml
Created Dec 20, 2012
Maven assembly plugin descriptor to bundle all WAR dependencies into a zip file, including local resource files. This is useful when you don't use EARs, but still want to package several web applications into one big archive, plus any additional stuff (e.g. configuration files) needed for deployment.
View wars-dist.xml
<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
<!-- A Maven assembly plugin descriptor to bundle all WAR dependencies into a zip file, including local
resource files. This is useful when you don't use EARs, but still want to package several web applications
into one big archive, plus any additional stuff (e.g. configuration files) needed for deployment. -->
<id>dist</id>
<formats>
<format>zip</format>
@KlausBrunner
KlausBrunner / Unzipper.java
Last active Sep 2, 2018
Extracts files and directories of a standard zip file to a destination directory. Requires at least Java 7.
View Unzipper.java
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import static java.nio.file.Files.*;
/**
* Extracts files and directories of a standard zip file to a destination directory. Requires at least Java 7.
*/
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