The Complex instantiator is a more sophisticated way of instantiating services. It provides for the wiring of dependencies into the new service "automatically" (based on specified dependencies). This instantiator is what allows Copland to claim support for "dependency injection."

Methods
Attributes
[R] construction_parms The hash of parameters to pass to the instantiating factory.
[R] factory_point The service point of the factory to use to instantiate the service.
Public Class methods
new( point, definition )

Create a new Complex instantiator for the given service point, using the given definition hash.

    # File lib/copland/instantiator/complex.rb, line 56
56:       def initialize( point, definition )
57:         super point, definition
58: 
59:         @factory_id = definition[ "factory" ] || "copland.BuilderFactory"
60:         @factory_id = @factory_id.value if @factory_id.respond_to?( :value )
61: 
62:         @construction_parms = definition.dup
63:         @construction_parms.delete "factory"
64:       end
Public Instance methods
instantiate()

Create a new instance of the service via the factory service. The constructor parameters are passed through the factory’s schema (if any) before passing them to the factory’s create_instance method.

    # File lib/copland/instantiator/complex.rb, line 81
81:       def instantiate
82:         @factory = @factory_point.instance unless @factory
83: 
84:         parms = @construction_parms
85:         schema = @factory_point.schema
86:         if schema.respond_to?( :process )
87:           parms = schema.process( @factory_point, point, parms )
88:         end
89:         
90:         @factory.create_instance( point, parms )
91:       end
validate!()

Validates the parameters to this instantiator by running them through the schema of the associated factory service point (if any).

    # File lib/copland/instantiator/complex.rb, line 68
68:       def validate!
69:         @factory_point = point.find_service_point( @factory_id )
70: 
71:         schema = @factory_point.schema
72:         if schema.respond_to?( :validate )
73:           schema.validate @factory_point, point, construction_parms
74:         end
75:       end