orchestrate_destroy for provider

https://bugzilla.redhat.com/show_bug.cgi?id=1491704

app/models/mixins/async_delete_mixin.rb

@@ -1,13 +1,14 @@
 module AsyncDeleteMixin
   extend ActiveSupport::Concern
   included do
-    def self._queue_task(task, ids)
-      ids.each do |id|
+    def self._queue_task(task, ids, deliver_on = nil)
+      Array.wrap(ids).each do |id|
         MiqQueue.put(
           :class_name  => name,
           :instance_id => id,
           :msg_timeout => 3600,
-          :method_name => task.to_s
+          :method_name => task.to_s,
+          :deliver_on  => deliver_on,
         )
       end
     end

app/models/provider.rb

@@ -63,4 +63,18 @@ def refresh_ems(opts = {})
     end
     managers.flat_map { |manager| EmsRefresh.queue_refresh(manager, nil, opts) }
   end
+
+  def self.destroy_queue(ids)
+    find(ids).each(&:destroy_queue)
+  end
+
+  def destroy_queue
+    return destroy if managers.empty?
+
+    _log.info("Queuing destroy of managers of provider: #{self.class.name} with id: #{id}")
+    managers.each(&:destroy_queue)
+
+    _log.info("Queuing destroy of provider: #{self.class.name} with id: #{id}")
+    self.class._queue_task(:destroy_queue, id, 15.seconds.from_now)
+  end
 end

spec/models/provider_spec.rb

@@ -1,5 +1,5 @@
 describe Provider do
-  let(:provider) { described_class.new }
+  let(:provider) { FactoryGirl.create(:provider) }
 
   describe "#verify_ssl" do
     context "when non set" do
@@ -61,4 +61,24 @@
       expect(tenant.providers).to include(provider)
     end
   end
+
+  context "#destroy_queue" do
+    it "destroy when has no managers" do
+      provider.managers = []
+      expect(provider).to receive(:destroy)
+      provider.destroy_queue
+    end
+
+    it "to destroy_queue its managers and itself" do
+      manager = FactoryGirl.create(:ext_management_system, :zone => EvmSpecHelper.local_miq_server.zone)
+      provider.managers = [manager]
+      expect(manager).to receive(:destroy_queue)
+      expect(provider).not_to receive(:destroy)
+      provider.destroy_queue
+      expect(MiqQueue.find_by(:instance_id => provider.id)).to have_attributes(
+        'method_name' => 'destroy_queue',
+        'class_name'  => provider.class.name,
+      )
+    end
+  end
 end