Module: Krikri::EntityConsumer

Extended by:
ActiveSupport::Concern
Included in:
Enricher, Indexer, Mapper::Agent
Defined in:
lib/krikri/entity_consumer.rb

Overview

A mixin for classes, like certain software agents, that generates entities. For example, a mapper usually generates RDF aggregations, such that Mapper::Agent includes EntityConsumer, and a mapper agent is instantiated with

a = Krikri::Mapper::Agent.new({
  generator_uri: 'http://some.org/activity/1'
})

such that

a.generator_activity

returns a Krikri::Activity

Instance Method Summary collapse

Instance Method Details

#assign_generator_activity!(opts) ⇒ Object

Store this agent’s generator activity, which is the activity that produced the target entities upon which the current agent will operate.

It is assumed that the agent class will define #entity_behavior, which returns the class of the appropriate behavior.

‘generator_uri’ can be a string or RDF::URI.

In the future, we might want to take a ‘generator_activity’ parameter, because not every activity will modify its entities with provenance messages; an indexing activity, in particular. In this case an LDP URI representing the activity is not relevant.

See Also:



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# File 'lib/krikri/entity_consumer.rb', line 36

def assign_generator_activity!(opts)
  if opts.include?(:generator_uri)
    generator_uri = opts.delete(:generator_uri)
    # allow generator_uri to be string or RDF::URI with `to_s' ...
    activity_id = generator_uri.to_s[/\d+$/].to_i  # 0 if no match
    fail "Can not determine ID for #{generator_uri}" if activity_id == 0
    @generator_activity = Krikri::Activity.find_by_id(activity_id)
    raise "Generator activity not found for id #{activity_id}" \
      unless @generator_activity
  end
end