In the previous post we started to look at how to implement a doodle using smart contracts written in DAML. The last code snippet we looked at was the IssueInvites choice, which is used to send out invites to each of the voters. …
In my previous post, DAML Smart Contracts Appetizer, I introduced the DAML smart contracts programming language and runtime and explained why I was so enthusiastic about it. I would now like to get into a slightly more complex example: a Doodle written in DAML.
Introduction
I am very enthusiastic about DAML, and for good reason. DAML has a lot going for it:
- It’s a strongly typed, functional programming language, based on Haskell
- The language and its developer tools are open source
- It comes with a smart contract test framework
- DAML has private transactions out of…
I have recently published a small Java library on Maven Central: written in plain Java, built with Gradle using Gradle’s Kotlin DSL, integrated using GitHub actions and published to Maven Central using Gradle’s “maven-publish” plugin.
Here are simple step-by-step instructions on how to reproduce and automate the process.
Sonatype OSS Project Setup
I am building a home climate monitoring system for my house. Active sensors are built around Raspberry Pi computers paired with AM2302 temperature / humidity sensors. The Raspberry Pis read humidity and temperature data from the sensors every minute, add metadata such as home id, room name, tenant ID —…
Non — blocking, asynchronous I/O APIs make your applications more resilient, responsive and cost effective. In this blog post we will look at the problems blocking I/O is causing, at how non-blocking I/O solves the problems and then apply these principles to the every-day use case of file uploading.
Synchronous Blocking I/O
Traditional…
The proxy based service mesh is an emerging technology that simplifies building distributed micro-services systems by using specialized proxies to provide cross-cutting infrastructure functionality such as service discovery, load balancing, circuit breaking, metrics monitoring, distributed tracing and more at container orchestration level. …
The Data Warehouse Definition
The other day I was listening to a software engineering podcast.
Don’t remember the exact title, but at some point the host asks the guest: “can you explain the difference between an operational database and a data warehouse?”. And the guest goes: “well, the operational database…
In my previous post, “A case for in-memory columnar data structures”, I used a JMH benchmark to show that if what we need to do is calculate statistical indicators over an object field ( metric ), destructuring data and store successive values of that metric in a continuous array is…
As a java programmer, did you ever wonder if all the fuss about those mechanical sympathy principles is justified? De-structuring your objects and collections, use sun.misc.Unsafe …
