Coiza - Making sense of information
I pretty much run my entire life directed by information from the Internet. I check the elements, check the traffic, look for places to visit, look for reviews for the places, get improvements from my friends and work - and browse lots of information from a great many other sources. The info I am thinking about depends upon many factors including the time of the day, my location, whether it's a work day or a weekend, whether I am at home or on vacation. Indeed many times the info I am interested is prompted by information I've already discovered. For instance, on a workday I would check the weather and, if it looks like rainwater, check the availability of trains to get me home (well I wouldn't want to get damp!).
Technology like Yahoo Now do a great job of automating information assimilation by speculating what information relevant is pertinent to me. The task of this kind of technology is the fact that assimilation, particularly across many information options, can be complex and not easy to reckon. An alternative procedure is to explicitly specify the rules by which information is assimilated in a way that may then be automatically prepared with what I call "Information Engines".
In this information I want to speak about an Information Engine unit that I've produced called Coiza. Coiza is built around information channels that can be subscribed to and which display information as feeds like those utilized by Facebook and Twitter.
Channels may display uncooked information, for example a reports route (like the BBC), or may display information resulting from combining information, for example location and Wikipedia summaries with the location. Channels can produce any information including framework information like location and time of day. One of the most interesting feature of Coiza is the fact it allows the definition of new channels predicated on existing channels and rules on how the info from the prevailing channels gets used to create information from a new channel.
2. Taking a look at Channels
Channels can be subscribed to within Coiza. With regards to the channel it could be necessary to source parameter ideals and/or authorisations for Coiza to gain access to private information (e. g. Google Calendar) using the OAuth standard protocol. Once programs have been subscribed to then information is viewed from that channel in a supply like format where in fact the feed is hidden when there is no information to display.
3. Creating Channels
- Info - A style of a bit of information that is either consumed or produced by a route and can be rendered within feeds.
- Channel - Consumes zero or even more info flows, emits an individual info circulation, and defines guidelines for producing the output flow. Stations may be nested within each other.
3. 1 Building Infos
Here can be an exemplory case of a CoizaLang info for Subject matter illustrating the key features of infos. First of all like all constructs, infos live in a namespace, or offer, in cases like this coiza since it comes as part of the coiza system. All infos (and for example programs) must live in a namespace you start with the username of the coiza consumer that created it - which in my own case is "jwillans".
Infos can subtype, or prolong, other infos which, as we will see a little later, allows the same instance of a sort to experiment with different roles with regards to the channel deploying it. In such a example Communication subtypes TitledContent and, in addition to presenting the hyperlink and author areas defined locally, subject and content fields are inherited through the sub type marriage. Areas can be typed using primitive beliefs or other info types.
A further important feature of infos is the optional render block which defines how infos are turned into html for screen within a give food to. When a subscribed channel is displayed (start to see the screenshot in Section 2) the provided feed is because turning infos into html using the render block. Render blocks support a subset of html combined with the ability to reference and find their way info domains using a little expression terms.
3. 2 Building Channels
Channels will be the breads and butter of coiza. A CoizaLang channel has zero or more input ports, a single output port, all of which are typed by infos. The work of a channel is to create output infos - often therefore of processing type infos. The causing infos can then either be viewed as feeds, presuming the channel has being subscribed to, and/or used as the type to an additional channel. In this way networks of programs can be created building on one another.
3. 2. 1 Obtaining the news
Here is a simple exemplory case of a route which does not do any control directly but wraps the prevailing channel RSSFeedProvider to explain a BBC reports route. I sometimes call these kinds of channels assembly channels. RSSFeedProvider is one of a number of channels that hook in to externally provided data, in cases like this getting information from an RSS feed. Other example of external data programs in coiza includes Yahoo Calendar, IMAP email, LinkedIn, current location, Wikipedia, currency converters and the list keeps growing on a regular basis. From a coiza viewpoint these behave the same as some other (user defined) route.
Like infos, channels are called and live in just a offer namespace. A route can have zero or more parameters which can be announced in the parenthesis following the route name (lines 5). Regarding the BBC Reports channel no guidelines are required. However RSSFeedProvider has an individual string parameter determining the RSS feed location, and the URL of the BBC reports feed comes as an argument to the RSS feed (brand 7). This BBC Media channel has no input plug-ins but defines a single output dock (line 9) which simply will take the output of RSSFeedProvider. By the way, although it cannot be seen from the above code, RSSFeedProvider produces infos of type Message which we protected in the previous section.
3. 2. 2 Filtering the news
FilteredTitle shows a parameterised channel, requiring a filtration system string, with both input (+) and end result (-) slots and a body that does indeed some processing. Take note how the jacks are typed as Entitled infoswhich is the base type Meaning subtypes thereby enabling this route to filter game titles on any type that expands Titled including Text messages. The body of the route iterates total the inbound infos from feed and filter systems them by using a pattern (collection 11) which essentially says that an info must be of type Titled and the name field must support the value of filtration. Any matching infos are emitted to the end result port.
Now that we have a filtration system channel we can create a fresh assembly channel to filtering the BBC information leveraging both channels we've created.
Most of the features of this channel has been illustrated previously, the main one new feature is the cable declaration (collection 14) which, as you may guess, identifies how output plug-ins are linked to input ports. In cases like this how the productivity of the BBC reports route is the type of the filtration system title channel. The output of this channel is then the productivity of the assemblage channel (collection 12).
3. 2. 3 Publishing the news
During creating a channel you'll be able to test the channel in order to ensure it works as designed as shown below.
For a individual channel to be subscribable, and used outside of testing, then it's important to guarantee that it is not going to change. To get this done, a channel must be published which then inhibits change. Before publication can happen, all infos or programs that are referenced by the route must be released and the route must not have any type checking issues (there is absolutely no sense in posting a channel that won't work).
Unpublishing can only happen if the construct being unpublished does not have any dependents either in the form of other constructs or individual subscriptions. If a change must a published route with dependents then your only way is to make a new version of this route (or indeed info).
We have created a couple of channels - BBC Media and Filtered BBC News - that once released can be subscribed to by any end user. As opposed to the user needing to search for the CoizaLang route name (i. e. BBCNews or FilteredBBCNews) it is possible to give the route a user-friendly name along with a description which are both used as part of the seek out subscribable channels system.
3. 2. 4 Show me in the morning
You've probably got a handle now on how coiza works and how anyone can build channels and those channels once published can either be subscribed to or used as a basis of further channels. By way of a final example, if Bob Dark brown publishes a channel to filter predicated on enough time of day, then we can create another BBC Information channel which filters both on the title and enough time of day.
I have spoken about how precisely Information Engines can help bring information jointly into a form that is appropriate to what the users is thinking about knowing, and I've walked through an exemplory case of an Information Engine unit I have constructed called Coiza. Hopefully Coiza looks useful and you will consider learning to be a subscriber to the wealthy array of channels that are beginning to be defined - or indeed specify one or more channel on your own. Finally in case you were wondering - why is Coiza called 'Coiza' - it originates from the Portuguese expression coisa meaning 'thing'!
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