WebhookAdapters are autoregistered

app/models/object_event_hook_config.rb

@@ -16,14 +16,7 @@ class ObjectEventHookConfig < ApplicationRecord
 
   serialize :object_event_types, Array
 
-  WEBHOOK = {
-    open_fn: 'open_fn'
-  }.freeze
-
   def webhook
-    case webhook_service
+    Houdini::WebhookAdapter.build(webhook_service, configuration.symbolize_keys)
-    when WEBHOOK[:open_fn]
-      Houdini::WebhookAdapter::OpenFn.new(configuration)
-    end
   end
 end

gems/bess/lib/houdini.rb

@@ -39,6 +39,4 @@ module Houdini
   mattr_accessor :core_classes, default: {supporter: 'Supporter', nonprofit: 'Nonprofit'}
 
   mattr_accessor :event_publisher, default: Houdini::EventPublisher.new
-
-  mattr_accessor :webhook_adapter
 end

gems/bess/lib/houdini/engine.rb

@@ -65,7 +65,6 @@ module Houdini
 
     config.houdini.listeners = []
 
-
     initializer 'houdini.set_configuration', before: 'factory_bot.set_fixture_replacement' do |app|
       app.config.to_prepare do
         Houdini.core_classes = app.config.houdini.core_classes

gems/bess/lib/houdini/webhook_adapter.rb

@@ -4,11 +4,11 @@ class Houdini::WebhookAdapter
   extend ActiveSupport::Autoload
   include ActiveModel::AttributeAssignment
 
-  autoload :OpenFn
+  autoload :OpenFnAdapter
 
   attr_accessor :webhook_url, :headers
-  def initialize(attributes={})
+  def initialize(**attributes)
-    assign_attributes(attributes) if attributes
+    assign_attributes(**attributes) if attributes
   end
 
   def transmit(payload)
@@ -19,4 +19,19 @@ class Houdini::WebhookAdapter
       headers: headers
     )
   end
+
+  ADAPTER = 'Adapter'
+  private_constant :ADAPTER
+
+  # based on ActiveJob's configuration
+  class << self
+    
+    def build(name, options)
+      lookup(name).new(**options)
+    end
+
+    def lookup(name)
+      const_get(name.to_s.camelize << ADAPTER)
+    end
+  end
 end

gems/bess/lib/houdini/webhook_adapter/open_fn_adapter.rb

@@ -1,4 +1,4 @@
 # License: AGPL-3.0-or-later WITH WTO-AP-3.0-or-later
 # Full license explanation at https://github.com/houdiniproject/houdini/blob/master/LICENSE
-class Houdini::WebhookAdapter::OpenFn < Houdini::WebhookAdapter
+class Houdini::WebhookAdapter::OpenFnAdapter < Houdini::WebhookAdapter
 end

spec/models/object_event_hook_config_spec.rb

@@ -11,10 +11,10 @@ RSpec.describe ObjectEventHookConfig, type: :model do
   describe '.webhook' do
     it 'returns an instance of OpenFn webhook' do
       webhook = double
-      expect(Houdini::WebhookAdapter::OpenFn)
+      expect(Houdini::WebhookAdapter)
-        .to receive(:new)
+        .to receive(:build)
+        .with(open_fn_config.webhook_service, open_fn_config.configuration.symbolize_keys)
         .and_return(webhook)
-        .with(open_fn_config.configuration)
       result = open_fn_config.webhook
       expect(result).to eq(webhook)
     end