Class: Eco::API::Session::Batch::BasePolicy

Inherits:
Object
  • Object
show all
Extended by:
Common::ClassHierarchy
Includes:
Language::Methods::DslAble, Enumerable
Defined in:
lib/eco/api/session/batch/base_policy.rb

Overview

Helper class to build a hierarchical model of policies

Examples:

Usage:

class PolicyModel < Eco::API::Session::Batch::BasePolicy
  MODEL = {attr1: ["prop1a", "prop1b", {"prop1c": ["prop1c1"]}]}
  self.model = MODEL
  policy_attrs *model_attrs
end

policies = PolicyModel.new("batch_policy")
policies.attr1c do |attr1c|
  attr1c.prop1c1.max = 30
end

Direct Known Subclasses

Policies

Instance Attribute Summary collapse

Attributes included from Common::ClassHierarchy

#model

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Common::ClassHierarchy

model_attrs, parse_model

Methods included from Common::ClassHelpers

#class_resolver, #descendants, #descendants?, #inheritable_attrs, #inheritable_class_vars, #inherited, #instance_variable_name, #new_class, #resolve_class, #to_constant

Methods included from Language::Methods::DslAble

#evaluate, #method_missing, #respond_to_missing?

Constructor Details

#initialize(attr = nil, _parent: self) ⇒ BasePolicy

Returns a new instance of BasePolicy.



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# File 'lib/eco/api/session/batch/base_policy.rb', line 71

def initialize(attr = nil, _parent: self)
  @_parent  = _parent
  @attr     = attr.to_sym
  @policies = {}
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Eco::Language::Methods::DslAble

Instance Attribute Details

#attr(as_namespace: false) ⇒ Symbol (readonly)

the Symbol name of the current policy

Returns:

  • (Symbol) —

    the current value of attr



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# File 'lib/eco/api/session/batch/base_policy.rb', line 21

def attr
  @attr
end

#max(value = :unused) ⇒ Integer

max allowed number of occurrences of the property

Returns:

  • (Integer) —

    the current value of max



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# File 'lib/eco/api/session/batch/base_policy.rb', line 21

def max
  @max
end

#min(value = :unused) ⇒ Integer

min required number of occurrences of the property

Returns:

  • (Integer) —

    the current value of min



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# File 'lib/eco/api/session/batch/base_policy.rb', line 21

def min
  @min
end

Class Method Details

.policy_attrs(*attrs) ⇒ Object

Attributes of this level of the model that should be included

Parameters:

  • attrs (Array<Symbol>, Array<String>) —

    each of the subpolicies of the model that should be available



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# File 'lib/eco/api/session/batch/base_policy.rb', line 42

def policy_attrs(*attrs)
  attrs = attrs.map(&:to_sym)

  attrs.each do |attr|
    method = attr.to_s.freeze
    var    = "@#{method}".freeze

    define_method(method) do |&block|
      unless policy = self[attr]
        klass  = self.class.policy_class(attr)
        policy = self[attr] = klass.new(attr, _parent: self)
      end

      if block
        policy.evaluate(policy, &block)
        self
      else
        policy
      end
    end
  end
end

.policy_class(key) ⇒ Eco::API::Session::Batch::BasePolicy

Note:

for this to work, key should be one of the submodels of the current class' model

If the class for key exists, it returns it. Otherwise it generates it.

Returns:



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# File 'lib/eco/api/session/batch/base_policy.rb', line 30

def policy_class(key)
  key             = key.to_sym.freeze
  class_name      = to_constant(key)

  new_class(class_name, inherits: Eco::API::Session::Batch::BasePolicy) do |klass|
    klass.model = model[key]
    klass.policy_attrs *klass.model_attrs
  end
end

Instance Method Details

#[](attr) ⇒ Array<Eco::API::Session::Batch::BasePolicy>

Returns the used subpolicies.

Parameters:

  • attr (Symbol, String) —

    name of the policy

Returns:



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# File 'lib/eco/api/session/batch/base_policy.rb', line 139

def [](attr)
  @policies[attr.to_sym]
end

#[]=(attr, value) ⇒ Object

Parameters:



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# File 'lib/eco/api/session/batch/base_policy.rb', line 145

def []=(attr, value)
  raise "Expected object of Eco::API::Session::Batch::BasePolicy. Given #{value.class}" unless value.is_a?(Eco::API::Session::Batch::BasePolicy)
  @policies[attr.to_sym] = value
end

#active?(attr) ⇒ Boolean

Returns if attr is an active subpolicy.

Parameters:

  • attr (Symbol, String) —

    name of the policy

Returns:

  • (Boolean) —

    if attr is an active subpolicy



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# File 'lib/eco/api/session/batch/base_policy.rb', line 133

def active?(attr)
  @policies.key?(attr.to_sym)
end

#compliant?(model, recurse: true) ⇒ Boolean

Returns true if model is compliant with the current policy.

Parameters:

  • model (Hash) —

    plain hash (or hashable object) with the stats to check policy compliance against

  • recurse (Boolean) (defaults to: true) —

    to determine if we only check the current policy or also all active subpolicies

Returns:

  • (Boolean) —

    true if model is compliant with the current policy



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# File 'lib/eco/api/session/batch/base_policy.rb', line 153

def compliant?(model, recurse: true)
  unless hash = model_to_hash(model)
    raise "Expected 'model' to be a Hash (or hashable) object. Given: #{model}"
  end
  value   = model_attr(hash)
  good    = !model_attr?(hash) || (min?(value) && max?(value))
  #pp "batch_policy: '#{attr}' - #{value}: 'min' #{min?(value)}; 'max' #{max?(value)}"
  good  &&= all? {|active| active.compliant?(model, recurse: recurse)} if recurse
  good
end

#each(&block) ⇒ Object 



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# File 'lib/eco/api/session/batch/base_policy.rb', line 121

def each(&block)
  return to_enum(:each) unless block
  items.each(&block)
end

#empty? ⇒ Boolean

Returns true if there are no active subpolicies, false otherwise.

Returns:

  • (Boolean) —

    true if there are no active subpolicies, false otherwise



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# File 'lib/eco/api/session/batch/base_policy.rb', line 112

def empty?
  count == 0
end

#items ⇒ Array<Eco::API::Session::Batch::BasePolicy>

Returns the active subpolicies.

Returns:



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# File 'lib/eco/api/session/batch/base_policy.rb', line 127

def items
  @policies.values
end

#length ⇒ Object

return [Integer] number of declared subpolicies



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# File 'lib/eco/api/session/batch/base_policy.rb', line 107

def length
  count
end

#max?(value) ⇒ Boolen

Note:

if there's no max defined, it always returns true

Returns true if value is lesser or equal to min.

Parameters:

  • value (Integer) —

    value to check if it's in the maximum allowed

Returns:

  • (Boolen) —

    true if value is lesser or equal to min



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# File 'lib/eco/api/session/batch/base_policy.rb', line 102

def max?(value)
  !max || !value || (max >= value)
end

#min?(value) ⇒ Boolen

Note:

if there's no min defined, it always returns true

Returns true if value is grater or equal to min.

Parameters:

  • value (Integer) —

    value to check if it's in the minimum required

Returns:

  • (Boolen) —

    true if value is grater or equal to min



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# File 'lib/eco/api/session/batch/base_policy.rb', line 95

def min?(value)
  !min || !value|| (min <= value)
end

#subpolicies? ⇒ Boolean

Returns true if there are active subpolicies, false otherwise.

Returns:

  • (Boolean) —

    true if there are active subpolicies, false otherwise



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# File 'lib/eco/api/session/batch/base_policy.rb', line 117

def subpolicies?
  !empty?
end

#uncompliance(model, recurse: true) ⇒ String

Returns message with what failed to meet compliance.

Parameters:

  • model (Hash) —

    plain hash (or hashable object) with the stats to check policy compliance against

  • recurse (Boolean) (defaults to: true) —

    to determine if we only check the current policy or also all active subpolicies

Returns:

  • (String) —

    message with what failed to meet compliance



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# File 'lib/eco/api/session/batch/base_policy.rb', line 184

def uncompliance(model, recurse: true)
  unless hash = model_to_hash(model)
    raise "Expected 'model' to be a Hash (or hashable) object. Given: #{model}"
  end
  msg = ""
  unless compliant?(hash, recurse: false)
    value = model_attr(hash)
    msg += "'#{attr(as_namespace: true)}' fails to meet: "
    msg += " [ min(#{min}) >=  #{value}] " unless min?(value)
    msg += " [ max(#{max}) <=  #{value}] " unless max?(value)
    msg += "\n"
  end

  if recurse
    map do |active|
      active.uncompliance(hash, recurse: true)
    end.compact.tap do |msgs|
      msg += "\n" + msgs.join("\n") unless msgs.empty?
    end
  end
  msg
end

#uncompliant(model) ⇒ Array<Eco::API::Session::Batch::BasePolicy>

Returns non-compliant policies for the model.

Parameters:

  • model (Hash) —

    plain hash (or hashable object) with the stats to check policy compliance against

Returns:



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# File 'lib/eco/api/session/batch/base_policy.rb', line 173

def uncompliant(model)
  each_with_object([]) do |active, arr|
    arr.concat(active.uncompliant(model))
  end.tap do |arr|
    arr.unshift(self) unless compliant?(model, recurse: false)
  end
end

#validate!(model) ⇒ Object 



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# File 'lib/eco/api/session/batch/base_policy.rb', line 164

def validate!(model)
  unless compliant?(model)
    msg = self.uncompliance(model)
    raise "Uncompliance Exception\n#{msg}"
  end
end