1 files changed, 50 insertions, 0 deletions
diff --git a/lib/gitlab/metrics/dashboard/service_selector.rb b/lib/gitlab/metrics/dashboard/service_selector.rb
new file mode 100644
index 00000000000..934ba9145a2
--- /dev/null
+++ b/lib/gitlab/metrics/dashboard/service_selector.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+# Responsible for determining which dashboard service should
+# be used to fetch or generate a dashboard hash.
+# The services can be considered in two categories - embeds
+# and dashboards. Embeds are all portions of dashboards.
+module Gitlab
+  module Metrics
+    module Dashboard
+      class ServiceSelector
+        SERVICES = ::Metrics::Dashboard
+
+        class << self
+          include Gitlab::Utils::StrongMemoize
+
+          # Returns a class which inherits from the BaseService
+          # class that can be used to obtain a dashboard.
+          # @return [Gitlab::Metrics::Dashboard::Services::BaseService]
+          def call(params)
+            return SERVICES::CustomMetricEmbedService if custom_metric_embed?(params)
+            return SERVICES::DynamicEmbedService if dynamic_embed?(params)
+            return SERVICES::DefaultEmbedService if params[:embedded]
+            return SERVICES::SystemDashboardService if system_dashboard?(params[:dashboard_path])
+            return SERVICES::ProjectDashboardService if params[:dashboard_path]
+
+            default_service
+          end
+
+          private
+
+          def default_service
+            SERVICES::SystemDashboardService
+          end
+
+          def system_dashboard?(filepath)
+            SERVICES::SystemDashboardService.system_dashboard?(filepath)
+          end
+
+          def custom_metric_embed?(params)
+            SERVICES::CustomMetricEmbedService.valid_params?(params)
+          end
+
+          def dynamic_embed?(params)
+            SERVICES::DynamicEmbedService.valid_params?(params)
+          end
+        end
+      end
+    end
+  end
+end