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Tag - DomainDriven

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2012, Thursday September 6

Roadmap: interface-based callbacks for Event Collaboration

On the mORMot roadmap, we added a new upcoming feature, to implement one-way callbacks from the server.
That is, add transparent "push" mode to our Service Oriented Architecture framework.

Aim is to implement notification events triggered from the server side, very easily from Delphi code, even over a single HTTP connection - for instance, WCF does not allow this: it will need a dual binding, so will need to open a firewall port and such.

It will be the ground of an Event Collaboration stack included within mORMot, in a KISS way.
Event Collaboration is really a very interesting pattern, and even if not all your application domain should be written using it, some part may definitively benefit from it.
The publish / subscribe pattern provides greater network scalability and a more dynamic SOA implementation: for instance, you can add listeners to your main system events (even third-party developed), without touching your main server.
Or it could be the root of the Event Sourcing part of your business domain: since callbacks can also be executed on the server side (without communication), they can be used to easily add nice features like: complete rebuild, data consolidation (and CQRS), temporal query, event replay, logging, audit, backup, replication.

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2012, Monday September 3

Client-Server allowed back to XE3 pro

The attempt to restrict the XE3 professional license did evolve into an amazing discussion in Embarcadero forums, and Delphi-related blogs.

David I announced the (reverted) EULA for Delphi Pro. Remote database access is again possible, with terms similar to Delphi Xe2.
You can check the Software License and Support Terms (EULA) for RAD Studio XE3 products.

This is good news, but also the opportunity to check the definitive terms.

In short, with the XE3 pro license, you have a deployment restrictive clause:

  • You can use DBExpress components and units only locally;
  • You can use DataSnap features only locally (it means that you can prototype using DataSnap, but are not allowed to deploy or redistribute DataSnap).

If you want to use those two features on Client-Server, you would need to buy a Client/Server Pack license:

If licensee has purchased a Client/Server Pack, the Licensee of RAD Studio, Delphi, or C++Builder XE3 Professional Edition (“Product”) may deploy that portion of the Product identified as "dbExpress" and dbExpress enterprise database drivers, in executable form only, to enable client server database access. Embarcadero may deliver the Product identified as “Enterprise,” however Licensee is licensed to use only the “Professional” edition features plus "dbExpress" and the Enterprise dbExpress database drivers in a client/server configuration. Licensee may evaluate the n-Tier DataSnap functionality included in the Enterprise Product delivered, but may not deploy or redistribute DataSnap.

This is now a real opportunity for our Open Source mORMot framework.
With a XE3 pro license, and even with a XE3 starter license, you are able, via our free units and classes:

That is, everything you need to build from a small Client-Server or stand-alone application up to the most scalable Domain-Driven design.

Nice, isn't it?

2012, Thursday July 12

One ORM to rule them all

If you discovered the mORMot framework, you may have found out that its implementation may sound restricted, in comparison to other ORMs, due to its design. It would be easy to answer that "it is not a bug, it is a feature", but I suspect it is worth a dedicated article.

Some common (and founded) criticisms are the following (quoting from our forum - see e.g. this question):
- "One of the things I don't like so much about your approach to the ORM is the mis-use of existing Delphi constructs like "index n" attribute for the maximum length of a string-property. Other ORMs solve this i.e. with official Class-attributes";
- "You have to inherit from TSQLRecord, and can't persist any plain class";
- "There is no way to easily map an existing complex database".

I understand very well those concerns.
Our mORMot framework is not meant to fit any purpose, but it is worth understanding why it has been implemented as such, and why it may be quite unique within the family of ORMs - which almost all are following the Hibernate way of doing.

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2012, Monday May 28

Synopse mORMot Framework 1.16

Our Open Source mORMot framework is now available in revision 1.16.

The main new features are the following:

Thanks to its features, mORMot is now able to provide a stand-alone Domain-Driven Design framework for Delphi.

Quite a long and nice road for a little mORMot, and more to come!

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2012, Friday May 25

Domain-Driven design

With a previous article, we introduced the concept of "Domain-Driven design" into our framework presentation.

It's now time to detail a bit more this very nice software architecture design, and how mORMot is able to achieve such an implementation pattern.

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