Class: Embulk::PluginRegistry

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(category, search_prefix) ⇒ PluginRegistry

Returns a new instance of PluginRegistry.



6
7
8
9
10
 
# File 'lib/embulk/plugin_registry.rb', line 6

def initialize(category, search_prefix)
  @category = category
  @search_prefix = search_prefix
  @map = {}
end

Instance Attribute Details

#category ⇒ Object (readonly)

Returns the value of attribute category.



12
13
14
 
# File 'lib/embulk/plugin_registry.rb', line 12

def category
  @category
end

Instance Method Details

#lookup(type) ⇒ Object

Raises:



19
20
21
22
23
24
25
26
27
28
29
 
# File 'lib/embulk/plugin_registry.rb', line 19

def lookup(type)
  type = type.to_sym
  if value = @map[type]
    return value
  end
  search(type)
  if value = @map[type]
    return value
  end
  raise ConfigError, "Unknown #{@category} plugin '#{type}'."
end

#register(type, value) ⇒ Object 



14
15
16
17
 
# File 'lib/embulk/plugin_registry.rb', line 14

def register(type, value)
  type = type.to_sym
  @map[type] = value
end

#search(type) ⇒ Object 



31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
 
# File 'lib/embulk/plugin_registry.rb', line 31

def search(type)
  name = "#{@search_prefix}#{type}"
  begin
    require name
    return
  rescue LoadError
  end

  # search from $LOAD_PATH
  load_paths = $LOAD_PATH.map do |lp|
    lpath = File.expand_path(File.join(lp, "#{name}.rb"))
    File.exist?(lpath) ? lpath : nil
  end

  paths = [name] + load_paths.compact.sort  # sort to prefer newer version
  paths.each do |path|
    begin
      require path
      return
    rescue LoadError
    end
  end

  # search gems
  if defined?(::Gem::Specification) && ::Gem::Specification.respond_to?(:find_all)
    specs = Gem::Specification.find_all do |spec|
      spec.contains_requirable_file? name
    end

    # prefer newer version
    specs = specs.sort_by {|spec| spec.version }
    if spec = specs.last
      spec.require_paths.each do |lib|
        require "#{spec.full_gem_path}/#{lib}/#{name}"
      end
    end
  end
end