Class: Ocelot::Processor

Inherits:
Base
  • Object
show all
Defined in:
lib/ocelot/processor.rb

Defined Under Namespace

Classes: ArrayRule

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#connection, #in?, #logger, #obj_to_s, #remove_callbacks, #safely

Constructor Details

#initialize ⇒ Processor

Returns a new instance of Processor.



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# File 'lib/ocelot/processor.rb', line 48

def initialize
  @extra_rules = {}
  @extra_filters = {}
  @seeds = []
  @unrecognised = Set.new
  @watcher = Watcher.new
end

Instance Attribute Details

#classes ⇒ Object

Returns the value of attribute classes.



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# File 'lib/ocelot/processor.rb', line 42

def classes
  @classes
end

#extra_filters ⇒ Object

Returns the value of attribute extra_filters.



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# File 'lib/ocelot/processor.rb', line 44

def extra_filters
  @extra_filters
end

#extra_rules ⇒ Object

Returns the value of attribute extra_rules.



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# File 'lib/ocelot/processor.rb', line 43

def extra_rules
  @extra_rules
end

#saved ⇒ Object (readonly)

Returns the value of attribute saved.



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# File 'lib/ocelot/processor.rb', line 46

def saved
  @saved
end

#seeds ⇒ Object

Returns the value of attribute seeds.



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# File 'lib/ocelot/processor.rb', line 41

def seeds
  @seeds
end

#watcher ⇒ Object (readonly)

Returns the value of attribute watcher.



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# File 'lib/ocelot/processor.rb', line 45

def watcher
  @watcher
end

Instance Method Details

#go ⇒ Object 



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# File 'lib/ocelot/processor.rb', line 130

def go
  setup_rules_and_filters

  @saved     = Set.new   
  @inspected = Set.new   

  array_rule   = ArrayRule.new

  seeds = @seeds.collect { |o| [o, Rules::INSPECT_DEEP, "script seed"] } 
  Graph::Traverser.run(seeds) do |objs, queue|
    obj, inspect_level, calller = *objs

    unless in? @saved, obj
      inspect_level = process_rule(:obj => obj, :caller => calller)
      @inspected << obj unless inspect_level > Rules::INSPECT_NONE
    end

    unless in? @inspected, obj and inspect_level > Rules::INSPECT_NONE
      obj.class.reflect_on_all_associations.each do |assoc| 
        safely obj do
          connection.use_source = true
          value = obj.send(assoc.name)

          unless value.nil?
 
            # simple has_one (A->B handling), save B and conditionally inspect
            if !assoc.collection?
              unless in? @saved, value
                child_inspect_level = process_rule(:obj => value, :caller => calller) 
                if child_inspect_level > Rules::INSPECT_NONE
                  queue << [value, child_inspect_level, obj_to_s(obj, assoc)]
                end
              end

            # more complicated has many (A-B* and A-mapobj-B*), saving and inspecting each child
            # monkeypatching the array_rule must yield B and whether to inspect it
            # be very very very careful, as it handles saving objects whie yielding results
            elsif inspect_level > Rules::INSPECT_SHALLOW
              array_rule.save(obj, value, assoc, self) do |child, child_inspect_level| 
                @saved << child
                if child_inspect_level > Rules::INSPECT_NONE
                  queue << [child, child_inspect_level,  obj_to_s(obj, assoc)] 
                else
                  @inspected << child 
                end
              end
            end
          end
        end
      end
    end
  end
end

#process_filter(params) ⇒ Object 



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# File 'lib/ocelot/processor.rb', line 56

def process_filter(params)
  obj        = params.delete :obj
  collection = params.delete :collection 
  name       = params.delete :name

  result = nil
  filter = @filters[obj.class]

  if !filter.nil?
    watcher.sync do |w|
      w.obj = obj
      w.association = name
      w.rule = filter
    end

    logger.info "Filtering #{obj_to_s(obj)}.#{name} via #{filter.class}"
    result = filter.load(obj, collection, name)
  elsif !@unrecognised.include? obj.class
    logger.error "Unrecognised type #{obj.class}"
    @unrecognised << obj.class
  end
  result || []
end

#process_rule(params) ⇒ Object 



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# File 'lib/ocelot/processor.rb', line 80

def process_rule(params)
  obj     = params.delete :obj
  src     = params.delete :src
  target  = params.delete :target
  calller = params.delete :caller 

  rule = @rules[obj.class]

  watcher.sync do |w|
    w.obj = obj
    w.association = nil
    w.rule = rule
  end

  if !rule.nil?
    logger.info "Saving #{obj_to_s(obj)} thru #{rule.class} via #{calller}"
    return rule.save(obj, src, target)
  elsif !@unrecognised.include? obj.class
    logger.warn "Unrecognised type #{obj.class}"
    @unrecognised << obj.class
  end
  Rules::INSPECT_NONE
end

#setup_rules_and_filters ⇒ Object 



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# File 'lib/ocelot/processor.rb', line 104

def setup_rules_and_filters
  default_rule   = Rules::DefaultRule.new
  default_filter = Rules::Filter.new

  @rules     = Hash.new
  @filters   = Hash.new

  @classes.each { |c| @rules[c] = default_rule; @filters[c] = default_filter }

  @rules.merge! @extra_rules
  @filters.merge! @extra_filters

  [@rules, @filters].each do |p|
    class << p 
      alias :old_index :[]
      def [](clazz)
        c = clazz
        while c
          return old_index(c) if old_index(c)
          c = c.superclass
        end
      end
    end
  end
end