2012-05-20
2012-05-20. Pascal Programming
In a Stack Overflow question, someone asked about some nested procedure call he found out. That is, a procedure inside another procedure.
He found out this coding style to be messy, which sounds like a reasonable opinion. But his alternative proposal of putting the internal procedure outside the main one, i.e. making it global, is IMHO even worse.
In some case, a private class, or even record
or object with methods is an handy and maintainable implementation
pattern.
2012-05-03
2012-05-03. Open Source › mORMot Framework
By default, during interface-based service call,
any record parameter or function result will be serialized with
our proprietary binary (and optimized layout) - i.e. RecordLoad
and RecordSave functions - then encoded in Base-64, to be
stored as plain text within the JSON stream.
But custom record JSON serialization can be defined, as with any
class - see this article - or
dynamic array - see this
article.
2012-04-25
2012-04-25. Open Source › mORMot Framework
In a discussion with Henrick Hellström, in Embarcadero forums, I wrote some high-level information about mORMot.
It was clear to me that our little mORMot is now far away from a simple Client-Server solution.
The Henrick point was that with Real Thin Client (RTC), you are able to write any Client-Server solution, even a RESTful / JSON based one.
He is of course right, but it made clear to me all the work done in
mORMot since its beginning.
From a Client-Server ORM, it is now a complete SOA framework, ready to serve
Domain-Driven-Design solutions.
2012-04-20
2012-04-20. Open Source › mORMot Framework
Our latest mORMot feature is interface-based service implementation.
How does it compare with the reference of SOA implementation (at least in the Windows world) - aka WCF?
"Comparaison n'est pas raison", as we use to say in France.
But we will also speak about Event Sourcing, and why it is now on our
official road
map.
Comparing our implementation with WCF is the opportunity to make our framework
always better.
2012-04-19
2012-04-19. Pascal Programming
Did you hear from the great Smart project?
It is an IDE and some source runtime able to develop and compile an
Object-Pascal project into a HTML 5 / CSS 3 / JavaScript embedded
application.
It does target AJAX Mobile application creation (i.e. Android and
iPhone/iPad apps running Web-Kit).
You'll get an unique .html file containing the whole client-side
application: it won't need any server side implementation. Using a third-party
tool like PhoneGap, you'd be able to supply your customers with true
native applications, running without any network, and accessing the full power
of any modern Smart Phone.
Smart is a great candidate for implementing rich client-side AJAX applications, to work with our client-server mORMot framework.
In order to interface Smart code with mORMot, we started implementing some low-level code to work with our RESTful authentication scheme.
So we'll need to implement some Smart dedicated Open Source code implementing crc32 and SHA-256 hashing.
2012-04-13
2012-04-13. Open Source › mORMot Framework
By default, our mORMot framework is able to serialize any class into a true JSON object.
All published properties will be written as JSON object
members.
In some cases, it may be handy to have a custom serialization, for instance if you want to manage some third-party classes, or to adapt the serialization scheme to a particular purpose, at runtime.
2012-04-12
2012-04-12. Open Source › mORMot Framework
One nice feature of the TDynArray wrapper and its associated
methods, as defined and used in our framework, is the ability to serialize
any dynamic array as JSON content.
By default, only "standard" dynamic arrays (like
TIntegerDynArray) are serialized as true JSON array: other not
known kind of arrays are serialized as binary content, within a Base64
encoding.
This is a very efficient solution for a pure Delphi application, since it will be fast and always works, but won't be easy to deal with from an AJAX client.
Applications can now supply a custom JSON serialization for any other
dynamic array, via the TTextWriter.RegisterCustomJSONSerializer()
class method.
Two callbacks are to be supplied for a dynamic array type information, in order
to handle proper serialization and un-serialization of the JSON array.
2012-04-10
2012-04-10. Pascal Programming
One potential issue with Delphi coding, is about how the result of a functions are implemented.
If you forget to set a result value to a function, you'll
get a compiler warning.
Never underestimate such warning: IMHO this is not a warning, but an error.
And you should better be aware of the handling of reference-counted types
(e.g. string) in a function results: those are passed the stack as
var parameters, so the result of a function may be set
even if an exception is raised during function execution!
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