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The "WritingPluginExample" page has been changed by LewisJohnMcgibbney: http://wiki.apache.org/nutch/WritingPluginExample?action=diff&rev1=12&rev2=13 + This plugin example focuses on the urlmeta plugin which which is packaged with Nutch-1.3. It aims to provide a comprehensive introduction to plugin development for Apache Nutch. + == The Example == - Consider this as a plugin example: We want to be able to recommend specific web pages for given search terms. For this example we'll assume we're indexing this site. As you may have noticed, there are a number of pages that talk about plugins. What we want to do is have it so that if someone searches for the term "plugin" we recommend that they start at the PluginCentral page, but we also want to return all the normal hits in the expected ranking. We'll seperate the search results page into a section of recommendations and then a section with the normal search results. + Consider this as a plugin example: We want to be able to recommend specific web pages for given search terms. For this example we'll assume we're crawling this site with Nutch and indexing it with Apache Solr. As you may have noticed, there are a number of pages that talk about plugins. If someone searches for the term "plugin", we want the first hit returned to be the Nutch PluginCentral page, however we also want to return all the normal hits in the expected ranking. - You go through your site and add meta-tags to pages that list what terms they should be recommended for. The tags look something like this: + In order to do this we go through our site and add meta-tags to pages that list what terms they should be recommended for. The tags look something like this: {{{ <meta name="recommended" content="plugins" /> }}} - In order to do this we need to write a plugin that extends 3 different extension points. We need to extend the HTMLParser in order to get the recommended terms out of the meta tags. The !IndexingFilter will need to be extended to add a recommended field to the index. The !QueryFilter needs to be extended to add the ability to search againsed the new field in the index. + In order to do this we need to write a plugin that extends 3 different extension points. We need to extend the HTMLParser in order to get the recommended terms out of the meta tags. The !IndexingFilter will need to be extended to add a recommended field to the index. Finally we need to add the new field to our Solr !QueryFilter needs to be extended to add the ability to search againsed the new field in the index. == Setup == Start by [[http://www.apache.org/dev/version-control.html#anon-svn|downloading]] the Nutch source code. Once you've got that make sure it compiles as is before you make any changes. You should be able to get it to compile by running ant from the directory you downloaded the source to. If you have trouble you can write to one of the [[Mailing|Mailing Lists]].
