The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for February, 2020

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Writing a Time Series Database from Scratch | Fabian Reinartz

Posted by jpluimers on 2020/02/20

Long read but very much worth it: [WayBack] Writing a Time Series Database from Scratch | Fabian Reinartz.

On using the file systems strengths for a flexible time series database that is both fast to write, and read millions of data points per second.

via:

Similarly interesting: [WayBack] Translations: This article was translated to Simplified Chinese by Xiong Duo and to Korean by Matt Lee (이 성욱). Introduction I want to make solid-state

–jeroen

Posted in Development, Power User, Software Development, Systems Architecture | Leave a Comment »

NuGet: migrate from packages.config to PackageReference with 3 clicks

Posted by jpluimers on 2020/02/19

Since I often forget to cleanup some bits of a migration: [WayBack] Migrate to PackageReference with 3 clicks:

Related:

–jeroen

Posted in .NET, Development, Software Development, Visual Studio 2015, Visual Studio 2017, Visual Studio and tools | Leave a Comment »

Mad With PowerShell

Posted by jpluimers on 2020/02/19

This is such a cool blog: Mad With PowerShell (Tim Curwick’s PowerShell blog, tips and tricks, tools and techniques, explanations and explorations).

I bumped into it by finding these two:

What I like most is that it gives great insight on how and why the internals of PowerShell work the way they do, and how to use that to your advantage.

–jeroen

Posted in CommandLine, Development, PowerShell, PowerShell, Scripting, Software Development | Leave a Comment »

Does anyone knows a existing implementation of bcrypt or scrypt for delphi?

Posted by jpluimers on 2020/02/19

For my link archive: [WayBack] Does anyone knows a existing implementation of bcrypt or scrypt for delphi? – Fabian S. Biehn – Google+:

–jeroen

Posted in Delphi, Development, Encryption, Power User, Security, Software Development | Leave a Comment »

linux – Bash: Command grouping (&&, ||, …) – Stack Overflow

Posted by jpluimers on 2020/02/18

Excellent answer at [WayBack] linux – Bash: Command grouping (&&, ||, …) – Stack Overflow by Charles Duffy:

Operator precedence for && and || is strictly left-to-right.

Thus:

pwd; (ls) || { cd .. && ls student/; }  && cd student || cd / && cd ;

…is equivalent to…

pwd; { { { (ls) || { cd .. && ls student/; }; } && cd student; } || cd /; } && cd ; }

…breaking that down graphically:

pwd; {                                      # 1
       {                                    # 2
         { (ls) ||                          # 3
                   { cd .. &&               # 4
                              ls student/;  # 5
                   };                       # 6
         } && cd student;                   # 7
       } || cd /;                           # 8
     } && cd ;                              # 9
  1. pwd happens unconditionally
  2. (Grouping only)
  3. ls happens (in a subshell) unconditionally.
  4. cd .. happens if (3) failed.
  5. ls student/ happens if (3) failed and (4) succeeded
  6. (Grouping only)
  7. cd student happens if either (3) succeeded or both (4) and (5) succeeded.
  8. cd / happens if either [both (3) and one of (4) or (5) failed], or [(7) failed].
  9. cd happens if (7) occurred and succeeded, or (7) occurred and succeeded.

Using explicit grouping operators is wise to avoid confusing yourself. Avoiding writing code as hard to read as this is even wiser.

–jeroen

Posted in *nix, *nix-tools, bash, bash, Development, Power User, Scripting, Software Development | Leave a Comment »

Some interesting Delphi MVVM posts…

Posted by jpluimers on 2020/02/18

Via [WayBack] We kick off a week of MVVM with an introduction of the Model-View-ViewModel pattern and how data binding is used to realize it. – Erik van Bilsen – Google+:

I wrote (and gave a few conference talks) about DSharp before, so the above is very interesting.

–jeroen

References:

Posted in Delphi, Development, Software Development | 2 Comments »

Scott Hanselman on Twitter: Learn C# in your browser, no install! Practice your .NET skills on an ChromeBook if you like! Your choice!

Posted by jpluimers on 2020/02/18

This is indeed an interesting live way to learn about C# even if you think you know most of it:

[WayBack] Scott Hanselman on Twitter: Learn C# in your browser, no install! Practice your .NET skills on an ChromeBook if you like! Your choice!

Here you go:

–jeroen

Read the rest of this entry »

Posted in .NET, C#, Development, Software Development | Leave a Comment »

100 km – how much needs to go into a tank? well2wheels/well to wheels (kWh).png at master · htc1977/well2wheels · GitHub

Posted by jpluimers on 2020/02/17

Since physics does not tend to change, this is still very accurate: [WayBack] well2wheels/well to wheels (kWh).png at master · htc1977/well2wheels · GitHub graphical WELL-TO-WHEELS Report Version 4.1 European Commission, 2014 – htc1977/well2wheels

A big picture is below the fold.

Other graphical file formats at [WayBack] GitHub – htc1977/well2wheels: graphical WELL-TO-WHEELS Report Version 4.1 European Commission, 2014

via:

–jeroen

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Posted in LifeHacker, Power User, science | Leave a Comment »

Solved: Stuttering Audio Streaming To Apple TV Via AirPlay – The Spotify Community

Posted by jpluimers on 2020/02/17

[WayBack] Solved: Stuttering Audio Streaming To Apple TV Via AirPlay – The Spotify Community:

Try to disable Wifi multimedia (WMM) from your router’s WLAN settings

For my Tomato USB it was easy as described by [WayBack] Installing AirPlay on Tomato – 2017 Edition [StartupCTO]:

disabling WMM in Tomato. (Advanced Settings → Wireless).

–jeroen

Posted in ASUS RT-N66U, Internet, Network-and-equipment, Power User, routers, TomatoUSB, WiFi | Leave a Comment »

When monitoring Windows service memory consumption from Zabbix and you get zeros

Posted by jpluimers on 2020/02/17

This is a small reminder to myself that when monitoring Windows service memory consumption from Zabbix and you get zeros, it means you need to monitor the Windows process instead of the service. The process will give you actual memory usage.

–jeroen

Posted in *nix, Monitoring, Power User, Zabbix | Leave a Comment »

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