ddimtirov

1864

ddimtirov

use_bpm 480

define :roll do |trigs, offset=0, duration=1, &block|
  return sleep(duration) if trigs==0
  
  roll_tick = duration.to_f / trigs
  sleep roll_tick * offset if offset>0 && offset<1
  trigs.times do
    block.call
    sleep roll_tick

ddimtirov

UDP Multicast in Container Networking

If your application is built around UDP Multicast, you are probably used to having network issues and long negotiations with the corporate data center network teams. For me that was one of the things that made me procrastinate learning about cloud and container networking, but now I finally bit tha bullet and it turns out the situation is not as bad as I thought (not that great either).

I will assume you have done your homework about basic Docker networking, if you don't go read the doc overview.

So, as we know Docker has the following built-in network drivers:

• None - no network - no multicast.
• Host - no abstraction - multicast away!

ddimtirov

Keybase proof

I hereby claim:

• I am ddimtirov on github.
• I am ddimitrov (https://keybase.io/ddimitrov) on keybase.
• I have a public key ASA7DCbHHZXnBpd19nhDwi0Bem4-wiNpZdwTjLn0G7zgDQo

To claim this, I am signing this object:

ddimtirov

package io.github.ddimitrov.modellerator.groovy.generator;

import groovy.lang.Binding;
import groovy.lang.GroovyShell;
import groovy.lang.Script;
import org.codehaus.groovy.runtime.ResourceGroovyMethods;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.io.File;

ddimtirov

Highlights

• long term roadmap for Java exists (Oracle is not reducing their investment despite shift in strategy to OSS and services)
• opening up developments
• cloud native recurring topic
• money from services
• new release model - same/better for devs, makes ent. pay
• making Java the premier choice for cloud native is recurring topic

Notable Projects:

• portola: containers (startup time, resource management)

ddimtirov

Memento is one of the less popular GoF patterns, that is solving a niche but important problem - how to reset the state of an object to a specified historical state. Examples include: hitting Cancel in a dialog, transaction rollback, etc.

The below code shows how to implement mementos in idiomatic Java, with minimum boiler plate and taking advantage of the features of a modern IDE (I've used IntelliJ IDEA, if anybody creates an Eclipse version let me know - I will link to it).

Instructions

1. Start with a data class like this one:

class DialogModel {

ddimtirov

Condition not satisfied:

"""\ $a foobar covfefe """ == """        $b foobar covfefe """
|
false

ddimtirov

This is a text file, click on the 'Raw' button to view as intended

Ansible

classpath () { jinfo -sysprops $1 | grep java.class.path | awk '{ print $3 }' | sed 's/:/\n/g' ; }

jps -q | xargs -n 1 classpath

ddimtirov

if ! out=`ansible-playbook yourplaybook.yaml`; then echo $out; fi

( ( do_something ; do_something_else ) > /dev/null ) 2>&1 | sed 's/^/doing_something: /g' >> /.../logs/cronerr.log