Class: SuperStack::Manager

Inherits:
Object
  • Object
show all
Includes:
SuperStack::MergePolicies::PolicyHandler
Defined in:
lib/super_stack/manager.rb

Constant Summary collapse

DEFAULT_PRIORITY_INTERVAL = 
10
DEFAULT_MERGE_POLICY = 
SuperStack::MergePolicies::StandardMergePolicy

Instance Attribute Summary collapse

Attributes included from SuperStack::MergePolicies::PolicyHandler

#merge_policy

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Manager

Returns a new instance of Manager.



13
14
15
16
17
 
# File 'lib/super_stack/manager.rb', line 13

def initialize
  self.extend SuperStack::Compatibility::Manager if SuperStack.compatibility_mode
  @layers = {}
  self.default_merge_policy = DEFAULT_MERGE_POLICY
end

Instance Attribute Details

#layers ⇒ Object (readonly)

Returns the value of attribute layers.



11
12
13
 
# File 'lib/super_stack/manager.rb', line 11

def layers
  @layers
end

#write_layer ⇒ Object

Returns the value of attribute write_layer.



11
12
13
 
# File 'lib/super_stack/manager.rb', line 11

def write_layer
  @write_layer
end

Instance Method Details

#<<(layer) ⇒ Object 



104
105
106
 
# File 'lib/super_stack/manager.rb', line 104

def <<(layer)
  add_layer layer
end

#[](filter = nil) ⇒ Object 



31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'lib/super_stack/manager.rb', line 31

def [](filter=nil)
  layers = to_a
  return [] if layers.empty?
  layers.each { |layer| layer.reload if layer.source_auto_reload?}
  first_layer = layers.shift
  first_layer = first_layer.disabled? ? SuperStack::Layer.new : first_layer
  res = layers.inject(first_layer) do |stack, layer|
    if layer.disabled?
      stack
    else
      policy_to_apply = layer.merge_policy.nil? ? default_merge_policy : layer.merge_policy
      policy_to_apply.merge stack, layer
    end
  end
  if filter.nil?
    res.to_hash
  else
    res[filter]
  end
end

#[]=(key, value) ⇒ Object 



26
27
28
29
 
# File 'lib/super_stack/manager.rb', line 26

def []=(key,value)
  raise 'No write layer specified' if write_layer.nil?
  write_layer[key] = value
end

#add_layer(layer) ⇒ Object 



60
61
62
63
64
65
66
67
68
69
70
 
# File 'lib/super_stack/manager.rb', line 60

def add_layer(layer)
  if layer.is_a? Hash and not layer.class.included_modules.include? SuperStack::LayerWrapper
    SuperStack::LayerWrapper.from_hash layer
  end
  set_valid_name_for layer if layers.keys.include? layer.name
  layer.priority = get_unused_priority if layer.priority.nil?
  raise 'This layer already belongs to a manager' unless layer.manager.nil?
  layers[layer.name] = layer
  layer.instance_variable_set :@manager, self
  layer.managed if layer.respond_to? :managed
end

#clear_layers ⇒ Object 



80
81
82
83
84
85
86
87
 
# File 'lib/super_stack/manager.rb', line 80

def clear_layers
  layers.values.each do |layer|
    layer_name = layer.name
    @write_layer = nil if layer == write_layer
    layer.instance_variable_set :@manager, nil
  end
  layers.clear
end

#disable_layer(layer_or_layer_name) ⇒ Object 



89
90
91
92
93
94
95
96
 
# File 'lib/super_stack/manager.rb', line 89

def disable_layer(layer_or_layer_name)
  layer = get_existing_layer layer_or_layer_name, 'Cannot disable unmanaged layer'
  if layer == write_layer
    @previous_write_layer = write_layer
    @write_layer = nil
  end
  layer.instance_variable_set :@disabled, true
end

#enable_layer(layer_or_layer_name) ⇒ Object 



98
99
100
101
102
 
# File 'lib/super_stack/manager.rb', line 98

def enable_layer(layer_or_layer_name)
  layer = get_existing_layer layer_or_layer_name, 'Cannot enable unmanaged layer'
  layer.instance_variable_set :@disabled, false
  @write_layer = @previous_write_layer if layer == @previous_write_layer
end

#reload_layers ⇒ Object 



108
109
110
 
# File 'lib/super_stack/manager.rb', line 108

def reload_layers
  layers.values.each &:reload
end

#remove_layer(layer_or_layer_name) ⇒ Object 



72
73
74
75
76
77
78
 
# File 'lib/super_stack/manager.rb', line 72

def remove_layer(layer_or_layer_name)
  layer = get_existing_layer layer_or_layer_name, 'Cannot remove unmanaged layer'
  layer_name = layer.name
  @write_layer = nil if layer == write_layer
  layer.instance_variable_set :@manager, nil
  layers.delete layer_name
end

#reset ⇒ Object 



56
57
58
 
# File 'lib/super_stack/manager.rb', line 56

def reset
  write_layer.clear unless write_layer.nil?
end

#to_a ⇒ Object 



52
53
54
 
# File 'lib/super_stack/manager.rb', line 52

def to_a
  layers.values.sort
end