Heckenlights is an interactive Christmas lights installation that can be controlled online by just visiting heckenlights.org. Heckenlights consists of over 3000 LED lights that are controlled via MIDI in 12 tracks. Each MIDI note switches the lights on and off.

It all started in 2012 with the idea to control a Relay with MIDI and lead to what it is today. Now, this season is the last one for Heckenlights. It’s been a great fun building Heckenlights and even more stepping outside, opening heckenlights.org on a smartphone and triggering the lights to play.

I’m moving next year to a new house. Heckenlights (originating from Heckenpfad, the address I live) is no more appropriate then.

You can see and operate Heckenlights until Jan 6th, 2017 between 5 pm and 10 pm (CET). After that date, it will be shut down.

Resources:

Redis is a data store supporting over 190 documented commands and over 450 command permutations. The community supports actively Redis development; each major Redis release comes with new commands. This year Redis was opened up for 3rd party vendors to develop modules that extend Redis functionality. Command growth and keeping track with upcoming modules are challenging for client developers and Redis users.

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The last two days, 08.03 - 09.03.2016, I attended JavaLand 2016. I was lucky having a talk about „What’s New in CDI 2.0“ and it was great for me. This year JavaLand came up with a Newcomer track for speakers that didn’t speak at a larger conference before. We were 10 speakers, each having a 20-minute slot.

This year JavaLand Keynote was more of an overview of the conference announcing 109 talks with over 390 submissions and about 30 Newcomer submissions of which 10 were accepted. Over 800 people attended the keynote.

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I just released lettuce 4.2.2.Final.

This is a bugfix release that fixes several issues. Updating is recommended for
setups with frequent reconnects or frequent cluster topology changes during runtime.

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Redis provides a neat command to iterate over all keys on a node. It’s the SCAN command that is used to scan over keys and to return a cursor to resume then the scanning from the cursor position. Complexity comes in when using Redis Cluster. In the previous scenario, all keys are located on one Redis node. With Redis Cluster keys are spread over some nodes.

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This post explains the use of a pooled GZIP OutputStream. The initial motivation were performance measurements of the GZIP'ing inside of logstash-gelf.

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Redis transactions allow to group multiple commands and to execute them sequentially. The whole transactional state is isolated from other users and becomes visible once a transaction is committed.

A Redis transaction is different from transactions in, let’s say, relational databases. A Redis transaction feels more like a queue/stack of commands because commands are queued and the execution is deferred. This is true for reads and writes. The real surprise is the read commands because any return value is returned only upon transaction execution.

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Passwords, API keys and confidential data fall into the category of secrets. Storing secrets the secure way is a challenge with limiting access and a true secure storage. Let’s take a look at Hashicorp Vault and how you can use it to store and access secrets.

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I consider myself very lucky for contributing to the open source space. Open source is one of the main building blocks of our digital world. For me, contributing is sharing, and sharing is giving back. I started contributing in early 2011. Transparency, quality, and purpose are my main reasons for my open source involvements. That is how I got in touch with the Spring Data team.

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