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Revision as of 11:14, 4 June 2009
Contents
Overview
The FeedAgent offers the functionality to receive RSS and Atom feeds on a regular basis. The implementation uses ROME and ROME Fetcher to retrieve and parse the feeds. ROME supports the following feed formats:
- RSS 0.90
- RSS 0.91 Netscape
- RSS 0.91 Userland
- RSS 0.92
- RSS 0.93
- RSS 0.94
- RSS 1.0
- RSS 2.0
- Atom 0.3
- Atom 1.0.
Agent configuration
The example configuration file called "feeds.xml" is located at configuration/org.eclipse.smila.connectivity.framework.
Defining Schema: org.eclipse.smila.connectivits.framework.agent.feed/schemas/FeedDataSourceConnectionConfigSchema.xsd.
Agent configuration explanation
The root element of FeedAgent configuration is DataSourceConnectionConfig and contains the following sub elements:
- DataSourceID – the identification of a data source
- SchemaID – specifies the schema for the data source
- DataConnectionID – describes which agent or crawler should be used
- Crawler – service id a Crawler
- Agent – service id of an Agent
- CompoundHandling – specify if packed data (like a zip containing files) should be unpack and files within should be processed(YES or NO).
- Attributes – list all attributes provided by the data source
- Attribute
- Type (required) – the data type (String, Integer or Date).
- Name (required) – attributes name.
- HashAttribute – specify if a hash should be created (true or false).
- KeyAttribute – creates a key for this object, for example for record id (true or false).
- Attachment – specify if the attribute return the data as attachment of record.
- Attribute
- Process – contains parameters for the agent business logic.
- UpdateInterval – the number of seconds to wait before reloading the feeds specified by FeedUrl.
- FeedUrl – the URL of the news feed to load. You may specify multiple FeedUrls.
Here is a description of the Attributes the FeedAgent offers. It provides attributes about the feed itself (using prefix Feed) and attributes for entries of the feed. Some attributes do not return Literals (String, Date) but nested objects like Person, Link, etc. These objects are all MObjects that contain attributes themselfes. The nested MObjects and their attributes (the attribute names are hard coded and cannot be configured) are described below.
Note that not all feeds necessarily provide values for all the attributes and that some values are provided that are not apperently part of the feed..
These are the attributes of the feed:
Attribute | Type | Description |
---|---|---|
FeedAuthors | List<Person> | Returns the feed authors |
FeedCategories | List<Category> | Returns the feed categories |
FeedContributors | List<Person> | Returns the feed contributors |
FeedCopyright | String | Returns the feed copyright information |
FeedDescription | String | Returns the feed description |
FeedEncoding | String | Returns the charset encoding of the feed |
FeedType | String | Returns the feed type |
FeedImage | Image | Returns the feed image |
FeedLanguage | String | Returns the feed language |
FeedLinks | List<Link> | Returns the feed links |
FeedPublishDate | Date | Returns the feed published date |
FeedTitle | String | Returns the feed title |
FeedUri | String | Returns the feed uri |
And here are the attributes of feed entries:
Attribute | Type | Description |
---|---|---|
Authors | List<Person> | Returns a feed entry authors |
Categories | List<Category> | Returns a feed entry categories |
Contents | List<Content> | Returns a feed entry contents |
Contributors | List<Person> | Returns a feed entry contributors |
Description | Content | Returns a feed entry description |
Enclosures | List<Enclosure> | Returns a feed entry enclosures |
Links | List<Link> | Returns a feed entry links |
PublishDate | Date | Returns a feed entry publish date |
Title | String | Returns a feed entry title |
Uri | String | Returns a feed entry uri. |
UpdateDate | Date | Returns a feed entry update date. |
MObject Person:
Attribute | Type | Description |
---|---|---|
String | Returns the email of the person | |
Name | String | Returns the name of the person |
Uri | String | Returns the uri of the person |
MObject Image:
Attribute | Type | Description |
---|---|---|
Link | String | Returns the link of the image |
Title | String | Returns the title of the image |
Url | String | Returns the url of the image |
Description | String | Returns the description of the image |
MObject Category:
Attribute | Type | Description |
---|---|---|
Name | String | Returns the name of the category |
TaxanomyUri | String | Returns the taxonomy uri of the category |
MObject Enclosure:
Attribute | Type | Description |
---|---|---|
Type | String | Returns the type of the enclosure |
Url | String | Returns the url of the enclosure |
Length | Integer | Returns the length of the enclosure |
MObject Link:
Attribute | Type | Description |
---|---|---|
Href | String | Returns the href of the link |
Hreflang | String | Returns the hreflang of the link |
Rel | Integer | Returns the rel of the link |
Title | String | Returns the title of the link |
Type | String | Returns the type of the link |
Length | Integer | Returns the length of the link |
MObject Content:
Attribute | Type | Description |
---|---|---|
Mode | String | Returns the mode of the content |
Value | String | Returns the value of the content |
Type | String | Returns the type of the content |
FeedAgent configuration example
<DataSourceConnectionConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../org.eclipse.smila.connectivity.framework.agent.feed/schemas/FeedDataSourceConnectionConfigSchema.xsd" > <DataSourceID>feeds</DataSourceID> <SchemaID>org.eclipse.smila.connectivity.framework.agent.feed</SchemaID> <DataConnectionID> <Agent>FeedAgent</Agent> </DataConnectionID> <CompoundHandling>Yes</CompoundHandling> <Attributes> <Attribute Type="Date" Name="PublishDate" HashAttribute="true"> <FeedAttributes>PublishDate</FeedAttributes> </Attribute> <Attribute Type="Date" Name="LastModifiedDate" HashAttribute="true"> <FeedAttributes>UpdateDate</FeedAttributes> </Attribute> <Attribute Type="String" Name="Uri" KeyAttribute="true"> <FeedAttributes>Uri</FeedAttributes> </Attribute> <Attribute Type="String" Name="Links"> <FeedAttributes>Links</FeedAttributes> </Attribute> <Attribute Type="MObject" Name="Contents"> <FeedAttributes>Contents</FeedAttributes> </Attribute> <Attribute Type="String" Name="Title"> <FeedAttributes>Title</FeedAttributes> </Attribute> <Attribute Type="MObject" Name="Authors"> <FeedAttributes>Authors</FeedAttributes> </Attribute> </Attributes> <Process> <UpdateInterval>300</UpdateInterval> <FeedUrl>http://dev.eclipse.org/newslists/news.eclipse.rt.smila/maillist.rss</FeedUrl> <FeedUrl>http://search.twitter.com/search.atom?q=smila</FeedUrl> </Process> </DataSourceConnectionConfig>
Output example
A record created by the FeedAgent using the default configuration may have the following or similar structure:
<Record xmlns="http://www.eclipse.org/smila/record" version="1.0"> <Id xmlns="http://www.eclipse.org/smila/id" version="1.0"> <!-- Element name must be Source, not _Source, it's made due to syntax coloring problem in wiki --> <_Source>feed</_Source> <Key name="Url">http://dev.eclipse.org/mhonarc/newsLists/news.eclipse.rt.smila/msg00022.html</Key> </Id> <A n="PublishDate"> <L> <V t="datetime">2009-04-30 13:28:34.0</V> </L> </A> <A n="Url"> <L> <V>http://dev.eclipse.org/mhonarc/newsLists/news.eclipse.rt.smila/msg00022.html</V> </L> </A> <A n="MimeType"> <L> <V>text/html</V> </L> </A> <A n="Title"> <L> <V>[news.eclipse.rt.smila] Re: Semantic Software Engineering</V> </L> </A> <A n="Contents"> <O> <A n="Value"> <L> <V>Hi Jürgen, The idea is to support companies and projects that rely on semantic technologies (especially in RDF or OWL) with a set of plugins that they can reuse for their tooling. The first thing would be support for loading an ontology, searching for conc...</V> </L> </A> <A n="Type"> <L> <V>text/html</V> </L> </A> </O> </A> <A n="Authors"> <O> <A n="Name"> <L> <V>lautenbacher@xxxxxxx (Florian Lautenbacher)</V> </L> </A> </O> </A> </Record>