Class: Veritas::Optimizer

Inherits:

Object

• Object
• Veritas::Optimizer

show all

Includes:

AbstractType, Adamantium

Defined in:

lib/veritas/optimizer.rb,
lib/veritas/optimizer/version.rb,
lib/veritas/optimizer/function.rb,
lib/veritas/optimizer/aggregate.rb,
lib/veritas/optimizer/optimizable.rb,
lib/veritas/optimizer/algebra/join.rb,
lib/veritas/optimizer/algebra/union.rb,
lib/veritas/optimizer/aggregate/sum.rb,
lib/veritas/optimizer/algebra/rename.rb,
lib/veritas/optimizer/aggregate/mean.rb,
lib/veritas/optimizer/function/unary.rb,
lib/veritas/optimizer/algebra/product.rb,
lib/veritas/optimizer/aggregate/count.rb,
lib/veritas/optimizer/function/binary.rb,
lib/veritas/optimizer/function/numeric.rb,
lib/veritas/optimizer/aggregate/minimum.rb,
lib/veritas/optimizer/aggregate/maximum.rb,
lib/veritas/optimizer/algebra/extension.rb,
lib/veritas/optimizer/function/predicate.rb,
lib/veritas/optimizer/algebra/projection.rb,
lib/veritas/optimizer/aggregate/variance.rb,
lib/veritas/optimizer/algebra/difference.rb,
lib/veritas/optimizer/algebra/restriction.rb,
lib/veritas/optimizer/algebra/intersection.rb,
lib/veritas/optimizer/relation/materialized.rb,
lib/veritas/optimizer/algebra/summarization.rb,
lib/veritas/optimizer/function/string/length.rb,
lib/veritas/optimizer/function/numeric/modulo.rb,
lib/veritas/optimizer/relation/operation/order.rb,
lib/veritas/optimizer/relation/operation/limit.rb,
lib/veritas/optimizer/relation/operation/unary.rb,
lib/veritas/optimizer/function/predicate/match.rb,
lib/veritas/optimizer/relation/operation/offset.rb,
lib/veritas/optimizer/function/numeric/addition.rb,
lib/veritas/optimizer/function/numeric/division.rb,
lib/veritas/optimizer/function/numeric/absolute.rb,
lib/veritas/optimizer/relation/operation/binary.rb,
lib/veritas/optimizer/function/connective/binary.rb,
lib/veritas/optimizer/relation/operation/reverse.rb,
lib/veritas/optimizer/relation/operation/deletion.rb,
lib/veritas/optimizer/function/numeric/unary_plus.rb,
lib/veritas/optimizer/support/predicate_partition.rb,
lib/veritas/optimizer/function/predicate/equality.rb,
lib/veritas/optimizer/function/predicate/no_match.rb,
lib/veritas/optimizer/function/numeric/subtraction.rb,
lib/veritas/optimizer/function/numeric/square_root.rb,
lib/veritas/optimizer/function/predicate/inclusion.rb,
lib/veritas/optimizer/function/numeric/unary_minus.rb,
lib/veritas/optimizer/aggregate/standard_deviation.rb,
lib/veritas/optimizer/function/connective/negation.rb,
lib/veritas/optimizer/function/predicate/less_than.rb,
lib/veritas/optimizer/relation/operation/insertion.rb,
lib/veritas/optimizer/function/predicate/exclusion.rb,
lib/veritas/optimizer/function/predicate/enumerable.rb,
lib/veritas/optimizer/function/predicate/inequality.rb,
lib/veritas/optimizer/function/predicate/comparable.rb,
lib/veritas/optimizer/relation/operation/combination.rb,
lib/veritas/optimizer/function/connective/disjunction.rb,
lib/veritas/optimizer/function/numeric/exponentiation.rb,
lib/veritas/optimizer/function/predicate/greater_than.rb,
lib/veritas/optimizer/function/numeric/multiplication.rb,
lib/veritas/optimizer/function/connective/conjunction.rb,
lib/veritas/optimizer/function/predicate/less_than_or_equal_to.rb,
lib/veritas/optimizer/function/predicate/greater_than_or_equal_to.rb

Overview

Defined Under Namespace

Modules: Algebra, Function, Optimizable, Relation Classes: Aggregate, PredicatePartition

Constant Summary

Identity =

An optimizer that returns the operation

lambda { |operation| operation }.freeze

VERSION =

'0.0.7'

Instance Attribute Summary (collapse)

• - (Optimizable) operation readonly private

  The operation to optimize.

Class Method Summary (collapse)

• + (#call) chain(*optimizers)

  Chain together a list of optimizer classes into a callable object.

• + (#call) link_optimizers(optimizer, successor) private

  Link an optimizer to a successor.

Instance Method Summary (collapse)

• - (undefined) initialize(operation) constructor private

  Initialize an Optimizer.

• - (Boolean) optimizable?

  Abstract method that tests if the optimization should be applied.

• - (Optimizable) optimize

  Abstract method that executes the optimization for the operation.

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# File 'lib/veritas/optimizer.rb', line 29

def initialize(operation)
  @operation = operation
end

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# File 'lib/veritas/optimizer.rb', line 19

def operation
  @operation
end

Optimizer.chain(Optimizer::Foo, Optimizer::Bar)

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# File 'lib/veritas/optimizer.rb', line 68

def self.chain(*optimizers)
  optimizers.reverse_each.reduce(Identity) do |successor, optimizer|
    link_optimizers(optimizer, successor)
  end
end

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# File 'lib/veritas/optimizer.rb', line 84

def self.link_optimizers(optimizer, successor)
  lambda do |operation|
    op = optimizer.new(operation)
    op.optimizable? ? op.optimize : successor.call(operation)
  end
end

optimizer.optimizable?  # => true or false

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# File 'lib/veritas/optimizer.rb', line 41

def optimizable?
  raise NotImplementedError, "#{self.class}#optimizable? must be implemented"
end

optimized = optimizer.optimize

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# File 'lib/veritas/optimizer.rb', line 53

def optimize
  raise NotImplementedError, "#{self.class}#optimize must be implemented"
end