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Franz Wong franzwong

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@franzwong
franzwong / gist:29f7fb8253af5db0a79addf7ba5fd4d6
Last active July 3, 2018 01:08
Create SSL
sudo openssl req -x509 -nodes \
-days 365 \
-newkey rsa:2048 \
-keyout /etc/ssl/mydomain_com.key \
-out /etc/ssl/mydomain_com.crt \
-subj '/CN=mydomain.com'
@franzwong
franzwong / main.md
Last active July 1, 2018 04:40
Interesting question

  • Joe Celko's SQL for Smarties, 5th Edition

    Chapter 32.1 - Finding Subregions of Size (n)

  • Finding the maximum contiguous sum in an array

@franzwong
franzwong / gist:540fe61c03ec359c72869e12f8cf3d69
Created June 30, 2018 03:46
Switch java version
alias j10="export JAVA_HOME=`/usr/libexec/java_home -v 10`; java -version"
alias j9="export JAVA_HOME=`/usr/libexec/java_home -v 9`; java -version"
alias j8="export JAVA_HOME=`/usr/libexec/java_home -v 1.8`; java -version"
alias j7="export JAVA_HOME=`/usr/libexec/java_home -v 1.7`; java -version"
@franzwong
franzwong / branch.md
Created April 20, 2018 12:37

Branches

Long life

  • master
  • dev

Short life

  • Release branch
@franzwong
franzwong / setup_local_dev_env_with_docker.md
Last active April 14, 2018 15:49
Setup local development environment with docker

Setup local development environment with docker

MySQL

Start MySQL docker

docker run --name local-mysql -d \
  -v <local data dir>:/var/lib/mysql \
 -e MYSQL_ROOT_PASSWORD= \
@franzwong
franzwong / coding_guideline.md
Last active April 11, 2018 00:52
Coding guideline

Coding guideline

Coding recommendation

  • Composition over inheritance
  • Extract code to separate method instead of putting code comment
  • Return early
  • Don't ignore exception
  • Avoid singleton pattern
@franzwong
franzwong / VertxApplication.kt
Created April 6, 2018 11:27
Simple Vert.x Webapp
import io.vertx.core.Vertx
import io.vertx.core.json.Json
import io.vertx.ext.web.Router
data class Person(
val name: String,
val nationality: String
) {
}
@franzwong
franzwong / BinaryTreeNode.java
Created December 3, 2017 09:36
BinaryTreeNode
public class BinaryTreeNode<T> {
private T value;
private BinaryTreeNode<T> leftChild;
private BinaryTreeNode<T> rightChild;
public T getValue() {
return value;
}
@franzwong
franzwong / app.go
Last active October 16, 2017 03:32
Quick sort implemented in Golang
package main
import (
"fmt"
"math/rand"
"time"
)
func Quicksort(elements []int, low int, high int) {
if (high > low) {
@franzwong
franzwong / Dockerfile
Created February 10, 2017 00:34
Enable JMX for Cassandra docker image
FROM cassandra:3.0
ENV LOCAL_JMX no
COPY jmxremote.password /etc/cassandra/jmxremote.password
RUN chown cassandra:cassandra /etc/cassandra/jmxremote.password
RUN chmod 400 /etc/cassandra/jmxremote.password
RUN sed -i '/monitorRole readonly/a cassandra readwrite' /etc/java-8-openjdk/management/jmxremote.access
RUN sed -i '/JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.port=$JMX_PORT/a\
\ \ JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=192.168.99.100"\
' /etc/cassandra/cassandra-env.sh
CMD ["cassandra", "-f"]