Class: ActiveRubinstein::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/active_rubinstein/base.rb

Overview

The serverpool is initialized here. The actual query methods are in these classes:

  • ActiveRubinstein::JenaQuery

  • ActiveRubinstein::LuceneSearcher

  • ActiveRubinstein::JosekiQuery

The SPARQL is created by ActiveRubinstein::SparqlFormulator

Direct Known Subclasses

JenaQuery, JosekiQuery, LuceneSearcher

Constant Summary collapse

@@language =

the default language for xml:lang matches

'fi'

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Base

creates the server pool and starts the DRb client



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# File 'lib/active_rubinstein/base.rb', line 77

def initialize
  self.shuffle #unless defined? $serverPool
  self.roll

  unless $serverPool.any? then
    raise EmptyServerPoolError, "No servers in the pool"

  else # pick a server from the pool
    RUBIC_DATASTORES.to_a.each do |adapter|
      begin
        # instantiate the server for the class
        case adapter
        when :jena
          ActiveRubinstein::JenaQuery.new

        when :joseki
          ActiveRubinstein::JosekiQuery.new

        when :lucene
          ActiveRubinstein::LuceneSearcher.new

        when :geolucene
          ActiveRubinstein::LuceneSearcher.new( :geolucene )

        else
          raise AdapterNotFoundError, adapter
        end
      rescue
        raise ConnectionNotEstablishedError, $!
      end
    end
  end
end

Class Method Details

.set_language(lang) ⇒ Object

propagates the xml:lang preference to all submodules



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# File 'lib/active_rubinstein/base.rb', line 183

def set_language( lang )
  @@language = lang
  ActiveRubinstein::JenaQuery.language = lang
end

Instance Method Details

#hello(server = nil) ⇒ Object

gets a greeting message from one or all of the servers in the pool

parameters:

  • 1 server (Symbol) – by default query all servers in the server pool



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# File 'lib/active_rubinstein/base.rb', line 208

def hello( server=nil )
  begin
    if server.nil? then # try all
      $serverPool.each_pair do |store, url|
        @@log.debug "Store: #{store.inspect}, url: #{url.inspect}"

        server = url.first
        @@log.rubinstein server.hello
      end
    else
      return server.hello
    end
  rescue
    @@log.error $!
  end
end

#roll ⇒ Object

starts the DRb client



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# File 'lib/active_rubinstein/base.rb', line 115

def roll

# # # # # # # # # # # # # # # # # # # # # # # # # # # # #

  # the daemon also includes this class, so do not attemp to start
  # the DRb client then.
  if @@in_daemon_mode then
    # TODO: check first if any of the servers are online and continue
    # pinging for..ever?
    @@log.rubinstein " * starting the DRb client"
    DRb.start_service
  end
end

#shuffle ⇒ Object

initializes the server pool



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# File 'lib/active_rubinstein/base.rb', line 134

def shuffle

################ ############################## ###########   

            ####### #####         ##  #  ######### #### # ####   

  unless RUBIC_DATASTORES.any? then
    raise AdapterNotSpecifiedError, "No adapters specified"

  else
    $serverPool = {} unless defined? $serverPool

    RUBIC_DATASTORES.to_a.each do |adapter|
      begin
        case adapter
        when :jena
          server = JenaEndpoint.new
          if server.ping
            $serverPool.update :jena => [ server ]
            @@log.info " => added #{server.inspect} to pool"
          end

        when :joseki
          server = JosekiEndpoint.new
          if server.ping
            $serverPool.update :joseki => [ server ]
            @@log.info " => added #{server.inspect} to pool"
          end

        when :geolucene
          server = GeoLuceneEndpoint.new
          if server.ping
            $serverPool.update :geolucene => [ server ]
            @@log.info " => added #{server.inspect} to pool"
          end
        end
      rescue
        raise ConnectionFailedError, $!.message
      end
    end
  end
end