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

Constructor Details

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

Returns a new instance of BasePolicy.



71
72
73
74
75
 
# 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



21
22
23
 
# 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



21
22
23
 
# 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



21
22
23
 
# 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



42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
 
# 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:



30
31
32
33
34
35
36
37
38
 
# 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:



139
140
141
 
# File 'lib/eco/api/session/batch/base_policy.rb', line 139

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

#[]=(attr, value) ⇒ Object

Parameters:



145
146
147
148
 
# 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



133
134
135
 
# 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



153
154
155
156
157
158
159
160
161
162
 
# 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 



121
122
123
124
 
# 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



112
113
114
 
# 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:



127
128
129
 
# File 'lib/eco/api/session/batch/base_policy.rb', line 127

def items
  @policies.values
end

#length ⇒ Object

return [Integer] number of declared subpolicies



107
108
109
 
# 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



102
103
104
 
# 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



95
96
97
 
# 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



117
118
119
 
# 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



184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
 
# 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:



173
174
175
176
177
178
179
 
# 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 



164
165
166
167
168
169
 
# 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