Argotic Syndication Framework

New Post: Does Argotic have a role in intra-application comms?

IanMayo — Wed, 23 Jul 2008 15:21:01 GMT

Hi all,

Short version: if I want to use Argotic fully within my application, does the data have to go "out of process"?

Long version:

I'm designing a .Net desktop application that allows users to maintain an application-area specific diary. I'm going to be using Atom with application-area extensions for the data storage format. It had been my intention to use a .Net DOM manager to maintain the diary as single large object (feed). With the feed size (~200 entries) and entry change frequency (one every two minutes or so), I think DOM item management (CRUD) would be fine.

Since reading about Argotic, however, I've started to realise that there may be future benefits in decoupling the data storage. By using Atom APP it may become an option to let a web-server based process manage the data, or to let the client view data from a number of separate diary feeds. If I did expand in this way in the future, then Argotic would be the natural solution. But, do the newsgroup readers think it would introduce an unnecessary performance burden when everything is running locally? It would be unfortunate if the UI component has to send the data "out of process" on it's way to the Argotic component.

I'd appreciate any related thoughts.

cheers,
Ian

New Post: Updating a feed

skateboardp — Wed, 23 Jul 2008 12:10:28 GMT

I tried setting the httpRequest.IfModifiedSince property to the previously cached lastmodified date taken from the source but it does not make a difference.
The http response code is set to 200 OK and the entire content is returned back, instead of a partial update.

So far I have simply tested it on the google news rss feed at http://news.google.co.uk/nwshp?hl=en&tab=wn&output=rss

I have looked at the links which you've posted but also found this one http://nick.typepad.com/blog/2004/09/rss_bandwidth_c.html

The most important section is this:

"Almost all aggregators store the date/time that a feed was last updated, and they pass this to the HTTP server via the If-Modified-Since HTTP
header the next time they request the feed.

If the feed hasn't changed since that date/time, the server returns an HTTP status code 304 to let the aggregator know the feed hasn't changed."

Commented Issue: ITunesSyndicationExtension generater itunes:image tag incorrectly

Oppositional — Wed, 23 Jul 2008 01:38:18 GMT

The extension ITunesSyndicationExtension generates: <itunes:image
Comments: ** Comment from web user: Oppositional **

Thank you for the detailed information,fix has been checked in.

Source code checked in, #20597

Oppositional — Wed, 23 Jul 2008 01:37:39 GMT

Implemented fix for issue 10626

Commented Issue: ITunesSyndicationExtension generater itunes:image tag incorrectly

dulfe — Thu, 17 Jul 2008 20:42:05 GMT

The extension ITunesSyndicationExtension generates: <itunes:image
Comments: ** Comment from web user: dulfe **

Replacing the line #428 in ”ITunesSyndicationExtensionContext.cs”:

writer.WriteElementString("image", xmlNamespace, this.Image.ToString());

with:

writer.WriteStartElement("image", xmlNamespace);
writer.WriteAttributeString("href", this.Image.ToString());
writer.WriteEndElement();

Fixes it… but I do not know if this is the best to do it according to the framework programming guides… but at least it works until the “official fix” gets public.

Commented Issue: ITunesSyndicationExtension generater itunes:image tag incorrectly

dulfe — Thu, 17 Jul 2008 18:46:26 GMT

The extension ITunesSyndicationExtension generates: <itunes:image
Comments: ** Comment from web user: dulfe **

The extension ITunesSyndicationExtension generates:
<itunes:image>http://images.cafepress.com/product/33230492v6_240x240_Front.jpg</itunes:image>
instead of
<itunes:image href="http://images.cafepress.com/product/33230492v6_240x240_Front.jpg" />
The work item http://www.codeplex.com/Argotic/WorkItem/View.aspx?WorkItemId=9767 indicates that this was fixed on the 2008.0.0.0 release… but I am using the version 2008.0.2.0 and the problem still exists.

Created Issue: ITunesSyndicationExtension generater itunes:image tag incorrectly

dulfe — Thu, 17 Jul 2008 18:42:47 GMT

The extension ITunesSyndicationExtension generates: <itunes:image

New Post: Updating a feed

Oppositional — Thu, 17 Jul 2008 14:37:05 GMT

Per http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25, it appears that technically you should be able to send just the cached value of the Last-Modified header and get back a 304 status indicating the resource has not been modified.

Most guidelines I have seen recommend sending both the If-Modified-Since and ETag headers, as I believe it covers both HTTP 1.0 and HTTP 1.1 scenarios.

I will look into modifying the ConditionalGet method to support performing a conditional GET using only a the Last-Modified header value cached froma previous request.

You may want to review http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19 and http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25 to learn how to perform conditional GEToperations in your application in the interim.

New Post: Updating a feed

skateboardp — Thu, 17 Jul 2008 10:43:01 GMT

Hi

I have been using the ConditionalGet function in the SyndicationDiscoveryUtility class and that works fine for updating a feed.
However, sometimes the eTag is not present meaning that the ConditionalGet function will not work as it takes this as a parameter.

Is there another way to do a partial update, I don't want to re-download the entire feed again as it wastes bandwidth.

Thanks.

Patch Uploaded: #1531

Roosmaa — Wed, 16 Jul 2008 22:27:02 GMT

Roosmaa has uploaded a patch.

Description:
Add Resource property for GenericItem class. It's like the GenericFeed Resource property but for the item the GenericItem is abstracting.
The main reason why this is useful is because else it is pretty hard to find the specific item in the feed that the GenericItem is referring to.

New Post: Need user feedback on future changes to the framework

Oppositional — Wed, 16 Jul 2008 20:38:46 GMT

Sometime in mid-2009, I am considering making some major changes to the framework. These changes are driven by a desire to simplify the framework physical architecture and reduce the cost of maintaining the source code and make utilizing the new features provided by the .NET 3.5/3.5 SP1 framework easier to adopt. The timeline for making these changes, as well as what will be changed will be driven by user feedback, so please reply with comments, ideas, opinions, etc.

Refactor Physical Assemblies

I am considering merging the current Argotic.Common.dll, Argotic.Core.dll and Argotic.Extensions.dll assemblies into a single Argotic.dll assembly.
1. The ASP.NET, WCF and HTTP specific features would still reside in the Argotic.Web.dll assembly.
The various classes, interfaces, and enumerations would still be logically segmented using the current namespaces.

Migration Away From .NET 2.0 Targeted Assemblies

Currently the Argotic framework provides a consistent API across either .NET 2.0 or .NET 3.5 to support a wide audience.
Providing a uniform API on both .NET 2.0 and .NET 3.5 limits what can be done (or at least increases the complexity) on the .NET 3.5 targeted assemblies.
The availability of .NET 3.5 through hosted web providers will continue to increase, making the need for a .NET 2.0 specific implementation less necessary.
Moving to only targeting the .NET 3.5 framework greatly reduces the maintenance and testing costs while allowing Argotic to provide a richer set of features.

If someone volunteers to focus on maintaining the .NET 2.0 targeted assemblies while I begin to focus on the .NET 3.5 side of things, that would be ideal, but so far outside contributors to this project has been erratic for the most part. I need to research the general availability of .NET 3.5 through hosted providers to determine how quickly the current technology stack landscape is moving towards general support of the .NET 3.5 framework.

If you use the Argotic Syndication Framework, I highly encourage you to reply, as I would like to consider the feedback from users before embarking on any major changes. It would also be nice to just know how many projects utilize this framework, so if you just want to reply with the project name and/or contact details that would be appreciated.

New Post: RssFeed.Create(): hexadecimal value 0x1F, is an invalid character

Oppositional — Wed, 16 Jul 2008 14:21:17 GMT

Solving the pre-processing of invalid hexadecimal characters prior to an XmlReader/XPathNavigator involves processing the feed content using a StreamReader, which in turn requires the use of the proper Encoding. The framework utilizes the explicitly specified character encoding in the settings, and if not present will do an inspection of the 'encoding' attribute of the xml declaration and use the value of that attribute to determine the encoding to use.

Please mail me a few sample feed file or links to feeds you are having an issue with and I will work on solving this problem, I am beginning to think I need to reconsider how I am attempting to provide feeed data source safety, as it is the likely root of this character encoding issue.

Thanks for bringing this to my attention.

New Post: Accents are converted to "??"

JanInformatica — Wed, 16 Jul 2008 07:41:25 GMT

Thank you for the repley.
I have done your solution and put the CharacterEncoding to default (unicode give an error).

            Dim settings As New SyndicationResourceLoadSettings
            settings.CharacterEncoding = System.Text.Encoding.Default

            Dim feed As New Argotic.Syndication.RssFeed
            feed = Argotic.Syndication.RssFeed.Create(New Uri(rssItem.Hyperlink), settings)

This resolve the rectangle and ? character convertion problem.
But now we got problems with other characters like é that's been translated to Ã© and ë to Ã«

                 ?John Mayer wijst huwelijksaanzoek af? (before)
                 ’John Mayer wijst huwelijksaanzoek af’   (after)

example:   Meintjes café nog één keer open    (this is before we applied the solution with the settings)
                Meintjes cafÃ© nog Ã©Ã©n keer open        (this is with the settings to defaul characterEncoding)

                Oud België    (before)
                Oud BelgiÃ« (after)

Is there a way that the character encoding can be autodetected and the feed been read in that encoding. Because we have a verry large number of feeds (arround the 1500) it's difficult to get everything good with the same setting.

New Post: RssFeed.Create(): hexadecimal value 0x1F, is an invalid character

JanInformatica — Wed, 16 Jul 2008 07:40:51 GMT

Thank you for the repley.
I have done your solution and put the CharacterEncoding to default (unicode give an error).

            Dim settings As New SyndicationResourceLoadSettings
            settings.CharacterEncoding = System.Text.Encoding.Default

            Dim feed As New Argotic.Syndication.RssFeed
            feed = Argotic.Syndication.RssFeed.Create(New Uri(rssItem.Hyperlink), settings)

This resolve the rectangle and ? character convertion problem.
But now we got problems with other characters like é that's been translated to Ã© and ë to Ã«

                 ?John Mayer wijst huwelijksaanzoek af? (before)
                 ’John Mayer wijst huwelijksaanzoek af’   (after)

example:   Meintjes café nog één keer open    (this is before we applied the solution with the settings)
                Meintjes cafÃ© nog Ã©Ã©n keer open        (this is with the settings to defaul characterEncoding)

                Oud België    (before)
                Oud BelgiÃ« (after)

Is there a way that the character encoding can be autodetected and the feed been read in that encoding?
Because we have a verry large number of feeds (arround the 1500) it's difficult to get everything good with the same setting.

Source code checked in, #19946

Oppositional — Wed, 16 Jul 2008 00:30:04 GMT

Implemented WebContentType class to provide generic representation of HTTP Content-Type header values for use in AtomPub.

Source code checked in, #19884

Oppositional — Tue, 15 Jul 2008 12:37:45 GMT

New Post: Converting GenericSyndicationFeed

AlexanderZeitler — Mon, 14 Jul 2008 11:52:04 GMT

Thanks

Alex

New Post: Converting GenericSyndicationFeed

Oppositional — Sun, 13 Jul 2008 21:08:31 GMT

See Format agnostic consumption of syndication feeds in the wiki documentation for more details and code examples. The GenericSyndicationFeed class provides a format agnostic view of a syndication resource but exposes the actual representation via the Resource and Format properties.

New Post: Converting GenericSyndicationFeed

AlexanderZeitler — Sun, 13 Jul 2008 20:37:23 GMT

Hi,

is there a simple way to convert a GenericSyndicationFeed into a RssFeed or AtomFeed?

Alex

New Post: RSS Header Info

skateboardp — Sat, 12 Jul 2008 19:08:15 GMT

Hi, I've managed to bind the data to a repeater and also display the content in a webpage. I still think that having some sort of example code
up will be a good idea for others who may have similar problems.