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Duncan Cragg on Declarative Architectures
About All Things...
Declarative, Mobile 2.0, REST, Cloud, Web 2.0, Ajax, Publish / Subscribe, Event-Driven Architectures, JSON, Atom, Microformats, Linked Data, P2P, Identity, Copyright, Multimedia, Cyberspace.
...taking programming beyond:
Threads, Message Queues, Client-Server, CORBA, Web Services, SOAs, Agents, Synchronous Architectures, Imperative Programming - and even Applications, Desktops and Documents
Duncan Cragg...
...works for ThoughtWorks UK; originally from April 2002 to July 2007 and now recently re-joined. Previously worked as a Web Architect for the Financial Times.
...went to both UCL and Imperial College of the University of London (in the Eighties); specialising in Logic during his MSc.
...wonders when his LinkedIn Account will be useful
...has a phone-cam, and used it on himself once, just before his weekly shave:
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...can be contacted by and followed on Twitter.
Cyrus in 2013
January 16, 2013 17:09

Well that worked out pretty well: I have a 3D environment on Android programmed in a simple but powerful declarative language which I've called "Cyrus".

Cyrus basically uses JSON all the way through: from user interface and scene graph to rewrite rules, on the wire and on disk. The Cyrus programming language is essentially JSON itself, as JSON rewrite rules. I've reduced the noise of JSON in Cyrus by taking out redundant double-quotes, square brackets and commas. It looks very nice to me.

The Name Cyrus

Now, probably to everyone's confusion and annoyance, I'm always thinking of multiple names for the many things I create around the core principles I'm evangelising. And then changing them all the time!

So I decided to choose a single new name, "Cyrus", for everything, and will endeavour to stick with it this time... I got the name from playing around with the letters of 'cyberspace rules', but will probably claim it stands for "cyberspace rules updating state" or something, because that sounds more impressive.

One advantage of this name is that both academics and regular folk should be able to spell it!

So now NetMash and Fjord are the "Cyrus app" and the "Cyrus programming language" respectively; the Object Network is now just the Cyrus network - a Web of JSON.

Once I have rough consensus and running code, it'll all be exchanging data via the Cyrus Media Type - probably "text/cyrus" for the simplified form and "application/cyrus+json" for the noisy one.

The basic underlying model and architecture implemented in Cyrus are still called "Functional Observer" and FOREST, however.

The Future of Programming

Edd Dumbill has recently described how he sees the Future of Programming.

In that article, Edd offers five categories that he sees as forces driving this, which I'd paraphrase as: concurrency within and between machines; embedded and mobile hardware; data-oriented programming; end-user programming; simplifying the software stack.

I was pretty excited to read this, because it accurately describes the drivers behind Cyrus.

Cyrus in 2013

So I'm now going to spend 2013 explaining to everyone why Cyrus is the next programming language they should try out. And, like I said before, I mean everyone - from kids to grannies, via Business Analysts.

Cyrus is, of course, very new, but even while it's maturing this year, it will still be good for non-critical uses, such as prototyping - especially mobile or distributed apps and sketching out business rules - and for making little fun apps, maybe while learning to program.

Do join the Cyrus Google Group if you want to get involved in any way, or just post a comment below.

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cyberspace ■ ■ architecture ■ ■ declarative ■ ■ json ■ ■ forest ■ ■ netmash ■ ■ cyrus ■ ■ object-network ■ ■ fjord ■ ■
 
Empowering the World | NetMash
August 17, 2012 11:11

If you also think that hacking up 3D worlds on Android could be fun, then join me! Stuff you should expect to play with if you want to get involved includes Java, Android, OpenGL ES 2.0, 3D model creation, hyperlinked JSON and JSON rewrite rules. Creatives, evangelists and inspirers are also very welcome to get involved!

The idea is to make an app (NetMash) that lets people build, mash up, animate and program 3D worlds, shared online and all linked-up, Web-like.

Like creative-mode Minecraft, but adding easy in-world programming and shared online by default. Or maybe a bit like an open, distributed, generic, mobile Kodu (or here), for adults as well as children.

NetMash is intended to deliver creative empowerment to ordinary people. We professional software folk often get stereotyped as geeks, and the creative fun we often have dismissed as in some way unusual. That's a real shame, because such prejudice means that the other 99.9% of the world are simply missing out on the joy of experiencing the most creative and empowering activities humankind has yet invented.   ...

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cyberspace ■ ■ declarative ■ ■ json ■ ■ metaverse ■ ■ netmash ■ ■ object-network ■ ■ fjord ■ ■
 
Fun and Virtual Worlds | NetMash
August 15, 2012 11:37

I just re-read my article on the Universe Web. I think it's pretty good. Indeed, to be honest, "programming as Cyberspace building" is where my heart has always been, and I'm all about following my heart this year. Especially if it's more fun, for both myself and others! Or if it opens up new worlds to new people.

In contrast, I don't see "fun" in W3C or IETF activities. Indeed, there's recently been a number of examples of tension in that world, between stabilisation and innovation, idealism and pragmatism, Enterprisey and Webby. Interestingly, all those examples have a "2.0" flavour: HTML5 (Web 2.0), HTTP 2.0 and OAuth 2.0.

My own interests are rough consensus and running code; innovation and pragmatism. Webbiness not in the W3C sense - "Web" Services, Semantic "Web", "Web" Sockets, etc. - but in the sense of "the simplest thing that works". Which is the Web of HTTP (1.1), URLs, JSON and REST, or specifically my FOREST interpretation.

I crave the simple and powerful, the cool and the fun. Which ultimately leads to the kind of thing I was describing as the Universe Web. And to be honest, I'd like to write and code for me, not for my peers and colleagues or for my career.

So, to the pursuit of pure joy in place of compromise, I'll now be focusing my energies on the journey of evolving the NetMash Java server and Android app towards an online, open, hyperlinked virtual world that is programmable in-world by users using simple rules.

Stay tuned!

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cyberspace ■ ■ declarative ■ ■ json ■ ■ metaverse ■ ■ netmash ■ ■ object-network ■ ■ fjord ■ ■
 
The Basics | The Object Network
January 20, 2012 18:07
Updated: January 23, 2012 19:45

Right, let's get started with some basic conventions in the Object Network!

This part in the Object Network series will cover URLs, HTTP headers and some common JSON patterns.

Updated 23/1/12: I changed the URLs in the example to have one of each type.   ...

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semanticweb ■ ■ architecture ■ ■ web2.0 ■ ■ microformats ■ ■ rest ■ ■ json ■ ■ forest ■ ■ object-network ■ ■
 
Why we should link up our Web APIs | The Object Network
January 19, 2012 20:58
Updated: January 22, 2012 16:05

OK, I'm trying to take a Big Idea and make it as Simple As Possible to grasp.

If we link our JSON data together and use the same formats, then our mobile, browser and server apps can become much simpler - through clean, stable, common, shared, re-used code - and much more powerful - through clean, stable, common, shared, linked, cached data.

This is the second part in the Object Network series, which will guide you away from building isolated Web APIs to engaging in a linked-up data landscape.   ...

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semanticweb ■ ■ architecture ■ ■ web2.0 ■ ■ microformats ■ ■ rest ■ ■ json ■ ■ forest ■ ■ object-network ■ ■
 
Introduction | The Object Network
November 29, 2011 23:11
Updated: January 22, 2012 16:03

It's interesting to compare the current growth of Web APIs with the early growth of the Web itself. To save you jumping those links: the Web dramatically beats the APIs.

I believe that the most likely cause of such relatively slow growth (in what should be a booming ecosystem) is that each API forms a closed silo and cannot benefit from any network effects. Every API is different and there are no links between them. There usually aren't any links within a silo. You can't even use a given API without first consulting the documentation.

The Object Network is designed to fix this, with linked-up JSON in common formats. This will allow easier mashing, sharing and cacheing of data and allow client code to be shared and reused.   ...

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semanticweb ■ ■ architecture ■ ■ web2.0 ■ ■ microformats ■ ■ rest ■ ■ json ■ ■ forest ■ ■ object-network ■ ■
 
OTS: The Benefits of both Native and Web Mobile
May 10, 2011 11:11

The Web, in its purest form - declarative HTML and CSS documents, XML feeds - is mashable, linkable, sharable. It's easy to create documents that slot into the global Web and can be accessed on any device; accessed by just a simple link. Servers can easily scale through statelessness and cacheing.

Native Mobile Apps are fast and slick. They are intimate with the dynamic, interactive, tactile mobile user interface, intimate with the capabilities of the device and intimate with the domain of mobile: photos, locations, contacts, messages.

OTS is a simple, clean, powerful approach to delivering Mobile functionality and content that is designed to realise these benefits of both Native Apps and the Web.   ...

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architecture ■ ■ declarative ■ ■ microformats ■ ■ rest ■ ■ scalability ■ ■ json ■ ■ mobile2.0 ■ ■ forest ■ ■ netmash ■ ■ u-web ■ ■ object-network ■ ■ fjord ■ ■
 
Mature REST In Six Lines!
May 6, 2011 11:11

Like Subbu, I also have been sitting on a blog post about the Richardson Maturity Model. I have different reasons for feeling uncomfortable with this Model, however.

The following came out of a discussion on an internal list at ThoughtWorks, where a number of people were talking about how they aspired to reach the "Holy Grail" of REST Level 3, and still thought they were basically "doing REST" by addressing most of the uniform interface.

But, as indeed pointed out in that article, REST is only at Level 3.

However, fortunately, you can jump right to Level 3 without much effort.   ...

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architecture ■ ■ rest ■ ■ json ■ ■
 
Minted Media Types are Usually Less RESTful Than JSON
May 5, 2011 12:16

This post is a response to a question that came up on an internal ThoughtWorks list. The question was, in summary: "Is using JSON more RESTful than minting our own Media Types as required, given that using raw JSON means reading inside the content in order to know what type is being transferred?"

TL;DR: Yes, use a common Media Type and "switch" on the internal data type; create a new Media Type only when something generic and broad and new and useful settles out.

Seems controversial to you? Read on...   ...

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architecture ■ ■ rest ■ ■ json ■ ■
 
FOREST News
February 12, 2011 14:07

Here's a quick catch-up of developments in FOREST.

I've been working much more on FOREST than Fjord or JSON-Mash recently, and it's coming along very nicely.

Actually, I've been lying flat out in bed with Pneumonia (and various other consequent ailments) for several weeks, so have been quietly tip-tapping away on a laptop resting on my tum, when I've had the energy.

Which has given me a chance to tidy up and finish off some FOREST stuff that I started last year...   ...

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forest ■ ■ netmash ■ ■
 
JSON-Mash
March 18, 2010 16:58

Around the middle of February I completed a basic persistence and networking implementation for Fjord, then had to do other things for a month. Just recently I fixed Fjord to work with the latest version of the Node.js APIs.

Next project: I'm going to use Fjord in a Web Framework to be called "JSON-Mash".

I intend to show that JSON-Mash will be a great framework for rapidly building truly interoperable and truly scalable online and distributed functionality.

Here's how JSON-Mash will work.   ...

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declarative ■ ■ event-driven ■ ■ rest ■ ■ json ■ ■ rest-observer ■ ■ forest ■ ■ fjord ■ ■
 
Fjord in Memory
January 26, 2010 13:46

Right, I'm pleased to say that I've now implemented enough of the Fjord language on Node.js to be able to run the Instrument example that I introduced it with. As yet, this runs in memory only - i.e., no disk, no network.

Here's the code on GitHub with tests that show how it works. The language has changed a little so I'll show the example here again, copied over from the test code, in order to explain the differences.   ...

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json ■ ■ forest ■ ■ fjord ■ ■
 
Fjord in Node
January 6, 2010 17:03

Well, I've put together the first few lines of Fjord, implemented on Node.js.

Here's the description on GitHub: Fjord is a language for expressing domain logic as match-rewrite functions over mashable JSON Web objects.

I'm developing Fjord very openly, in the hope someone out there will be interested in getting involved in helping guide its design and implementation. I suppose code speaks louder than blog posts.   ...

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event-driven ■ ■ json ■ ■ forest ■ ■ fjord ■ ■
 
Introducing Fjord
December 11, 2009 08:22

Following on from my recent article where I

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