Class: Medea::JasonBase

Inherits:
Object
  • Object
show all
Includes:
ClassLevelInheritableAttributes
Defined in:
lib/medea/jason_base.rb

Direct Known Subclasses

JasonObject

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ClassLevelInheritableAttributes

included

Class Method Details

.resolve(key, mode = :lazy) ⇒ Object

the resolve method takes a key and returns the JasonObject that has that key This is useful when you have the key, but not the class



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# File 'lib/medea/jason_base.rb', line 10

def self.resolve(key, mode=:lazy)
  q = JasonDeferredQuery.new :filters => {:VERSION0 => nil, :FILTER => {:HTTP_X_KEY => key, :HTTP_X_ACTION => :POST}}
  q.filters[:FILTER] ||= {}
  q.filters[:FILTER][:HTTP_X_KEY] = key
  resp = JSON.parse(RestClient.get(q.to_url))
  if resp.has_key? "1"
    #this is the object, figure out its class
    resp["1"]["POST_TO"] =~ /([^\/]+)\/#{key}/
    begin
      result = Kernel.const_get($1).get_by_key key, :lazy
      if result["1"].has_key? "CONTENT"
        result.instance_variable_set(:@__jason_data, result["1"]["CONTENT"])
        result.instance_variable_set(:@__jason_state, :stale)
      end
      if mode == :eager
        result.send(:load)
      end
    rescue
      nil
    end
  end
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 33

def ==(other)
  return false if not other.is_a? JasonBase
  jason_key == other.jason_key
end

#build_url ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 104

def build_url
  url    = "#{JasonDB::db_auth_url}@0.content?"
  params = [
      "VERSION0",
      "FILTER=HTTP_X_KEY:#{self.jason_key}",
      "FILTER=HTTP_X_CLASS:#{self.class.name}"
  ]

  url << params.join("&")
  url
end

#delete!(cascade = false) ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 88

def delete! cascade=false
  #TODO: Put this into some kind of async method or have JasonDB able to set flags on many records at once
  #This will be REALLY REALLY slowww!
  if cascade && (self.class.class_variable_defined? :@@lists)
    @@lists.keys.each do |list_name|
      #for each list that I have
      list = send(list_name)
      list.each do |item|
        #remove each item from the list, deleting it if possible
        list.remove! item, true
      end
    end
  end
  persist_changes :delete
end

#jason_etag ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 48

def jason_etag
  @__jason_etag ||= ""
end

#jason_key ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 38

def jason_key
    #Generate a random UUID for this object.
   #since jason urls must start with a letter, we'll use the first letter of the class name
    @__id ||= "#{self.class.name[0].chr.downcase}#{UUIDTools::UUID::random_create.to_s}"
end

#jason_parent ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 52

def jason_parent
  @__jason_parent ||= nil
  if @__jason_parent == nil && @__jason_parent_key
    #key is set but parent not? load the parent
    @__jason_parent = JasonObject.resolve @__jason_parent_key
  end
  @__jason_parent
end

#jason_parent=(parent) ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 61

def jason_parent= parent
  @__jason_parent = parent
  @__jason_parent_key = parent.jason_key
end

#jason_parent_key ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 66

def jason_parent_key
  @__jason_parent_key ||= nil
end

#jason_parent_key=(value) ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 70

def jason_parent_key= value
  @__jason_parent_key = value
  #reset the parent here?
  @__jason_parent = nil
end

#jason_parent_list ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 76

def jason_parent_list
  @__jason_parent_list ||= nil
end

#jason_parent_list=(value) ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 80

def jason_parent_list= value
  @__jason_parent_list = value
end

#jason_state ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 44

def jason_state
  @__jason_state
end

#jason_timestamp ⇒ Object 



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# File 'lib/medea/jason_base.rb', line 84

def jason_timestamp
  @__jason_timestamp
end

#load_from_jasondb ⇒ Object

fetches the data from the JasonDB



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# File 'lib/medea/jason_base.rb', line 118

def load_from_jasondb
  #because this object might be owned by another, we need to search by key.
  #not passing a format to the query is a shortcut to getting just the object.
  url = to_url
  
  response = RestClient.get url
  @__jason_data = JSON.parse response
  @__jason_etag = response.headers[:etag]
  @__jason_timestamp = response.headers[:timestamp]
  if response.headers[:http_x_public]
    @public = response.headers[:http_x_public].split(",")
  end
  @__jason_state = :stale
end