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

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Archive for January, 2018

Which class memory management model would you prefer for Delphi?

Posted by jpluimers on 2018/01/31

An interesting discussion on ARC and classic memory management in Delphi and ideas on hybrid ways: [WayBack] Which class memory management model would you prefer for Delphi? Or better, which one would fit better for your needs? – Malcon X Portela – Google+

–jeroen

Posted in Delphi, Development, Software Development | 9 Comments »

Life Beyond Distributed Transactions – ACM Queue

Posted by jpluimers on 2018/01/31

This article focuses on how an application developer can build a successful scalable enterprise application when he or she has only a local database or transaction system available. Availability is not addressed, merely scale and correctness.

I’m re-reading [WayBackLife Beyond Distributed Transactions – ACM Queue as it such a great article.

Via: [WayBack] Pat Helland on scaling: If you are not willing to pay the cost of distributed transactions, what options do you have and what are the costs associated with this choice – Kristian Köhntopp – Google+

Executive Summary: embrace uncertainty. It can’t be avoided.

–jeroen

Posted in Design Patterns, Development, Software Development | Leave a Comment »

As Delphi generics are not supported for free functions, wrap them in a record container.

Posted by jpluimers on 2018/01/31

Of the things not possible with generics in Delphi, I already wrote about Impossible: Property using Generics in Delphi.

Now it’s time to write about simulating a free function with generics as this is impossible:

function CreateManaged<T>(const value: T): IManaged<T>;

Usually I create a static record method for these, as records do not have VMT overhead, less RTTI overhead and I’ve been used to see records as helpers for other types long before helpers initially were introduced in Delphi 8 to extend classes..

Spring4D has an excellent example of such a record workaround in the Managed.New<T> commit:

type
  Managed = record
  public
    class function New<T>(const value: T): IManaged<T>; static;
  end;

...

class function Managed.New<T>(const value: T): IManaged<T>;
begin
  Result := TManaged<T>.Create(value);
end;

It basically is a factory for classes implementing the IManaged interface.

In the mean time, Managed has been renamed to Shared but the above code shows my point.

–jeroen

Reference: [WayBackClass Helpers documented in Delphi 2007, introduced in Delphi 8

Posted in Delphi, Development, Software Development | 5 Comments »

unxz on Mac OS X requires the xz formula from homebrew

Posted by jpluimers on 2018/01/30

Most sites explaining how to decompress an xz file mention you should use unxz from the xz utils toolbox.

Running unzx on Msc OS X requires the xz formula from homebrew:

$ brew install xz
==> Downloading https://homebrew.bintray.com/bottles/xz-5.2.2.mavericks.bottle.tar.gz
######################################################################## 100.0%
==> Pouring xz-5.2.2.mavericks.bottle.tar.gz
🍺  /usr/local/Cellar/xz/5.2.2: 91 files, 1.4M

–jeroen

Posted in Apple, Home brew, Mac OS X / OS X / MacOS, macOS 10.12 Sierra, OS X 10.10 Yosemite, OS X 10.9 Mavericks, Power User | Leave a Comment »

Delphi 2009 syntax; not official, but a great start and complement to DelphiAST

Posted by jpluimers on 2018/01/30

A while ago, I found out that [WayBackToon Krijthe made a [Archive.isDelphi 2009 syntax sample which is a great complement to the DelphiAST parser given that Borland/CodeGear/Embarcadero/Idera never published one in the 22+years that Delphi is alive.

–jeroen

Posted in Delphi, Delphi 2009, Development, Software Development | 6 Comments »

 
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