Overview

Featurelens application consists of

1. ruby server that takes a relational database location and a port number. It listens for requests from the client.
2. Open Laszlo client, that sends requests to the ruby server and listens for XML message responses.

The ruby server talks with

1. Lucene indices
2. Relational database

Ingestion process consists of following steps:

1. Create a new database for the collection, follow the convention featurelens_collectionname_feature.
2. use org.monkproject.preprocess.featurelens.CreateFeatureLensCollectionAndChunkTables program to create the chunk and collection tables in the database. Modify the rdbms.properties file to point to the correct database before running the application.
3. Run sentimentality-featurelens.itn (checked into the monk-preprocess module in the monk svn) locally on a machine that has access to the lucene indices, you can run this itinerary in a batch mode on the server in case you do not have access to the Lucene indices. ALG/NCSA folks can help with that. This step will populate the patterns table. Use proper parameters for the Input: CollectionName/ChunkType, ChunkIds and Feature input modules.
4. Modify the import_filter_analyze.rb, change the main batch as below and run the script. This will create the metrics tables.

   $dbh = DBI.connect("DBI:Mysql:featurelens_sentimentality_twograms:localhost", "$user", "$password")
   begin
    col_id= ARGV[0]
   
     #build index
     puts "build index"
     build_index(col_id)
   
     #analyze
     puts "compute metrics across section"
     computeMetrics(col_id)
   
     #compute section metrics for words
     puts "compute metrics inside section"
     computeMetricsSection(col_id)
   
     #update support
     puts "update support"
     updateSupport(col_id)
   
     #delete index
     FileUtils::remove_entry_secure("indices/text" + col_id.to_s, true)
     FileUtils::remove_entry_secure("indices/patterns" + col_id.to_s, true)
   
     #rebuild index
     puts "rebuild index"
     build_index(col_id)
   
     #optimize index
     puts "optimize index"
     optimize(col_id)
   
     puts "That's it buddy ..."
   end
   

Modify the server:

Change the port number and database location in the server.rb file

 dbh = DBI.connect("DBI:Mysql:featurelens_sentimentality_twograms:localhost", "$user", "$password")
 server = WEBrick::HTTPServer.new(:Port => $portnum)

Modify the Openlaszlo source code _ settingsWindow.lzx_ file:

<attribute name="backendURL" type="string" value="http://$host:$port/"/>^M