Class: RedisGraph::Metadata

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

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Metadata

Returns a new instance of Metadata.



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# File 'lib/redisgraph.rb', line 13

def initialize(opts = {})
  @graphname = opts[:graphname]
  @connection = opts[:connection]

  # cache semantics around these labels, propertyKeys, and relationshipTypes
  # defers first read and is invalidated when changed.
  @labels_proc =  -> { call_procedure('db.labels') }
  @property_keys_proc = -> { call_procedure('db.propertyKeys') }
  @relationship_types_proc = -> { call_procedure('db.relationshipTypes') }
end

Instance Method Details

#call_procedure(procedure) ⇒ Object 



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# File 'lib/redisgraph.rb', line 40

def call_procedure(procedure)
  res = @connection.call("GRAPH.QUERY", @graphname, "CALL #{procedure}()")
  res[1].flatten
rescue Redis::CommandError => e
  raise CallError, e
end

#invalidate ⇒ Object 



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# File 'lib/redisgraph.rb', line 24

def invalidate
  @labels = @property_keys = @relationship_types = nil
end

#labels ⇒ Object 



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# File 'lib/redisgraph.rb', line 28

def labels
  @labels ||= @labels_proc.call
end

#property_keys ⇒ Object 



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# File 'lib/redisgraph.rb', line 32

def property_keys
  @property_keys ||= @property_keys_proc.call
end

#relationship_types ⇒ Object 



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# File 'lib/redisgraph.rb', line 36

def relationship_types
  @relationship_types ||= @relationship_types_proc.call
end