make facades const to be consistent with const shmem block

include/engine/engine.hpp

@@ -59,7 +59,7 @@ class Engine final
 
     // note in case of shared memory this will be empty, since the watchdog
     // will provide us with the up-to-date facade
-    std::shared_ptr<datafacade::BaseDataFacade> immutable_data_facade;
+    std::shared_ptr<const datafacade::BaseDataFacade> immutable_data_facade;
 };
 }
 }

include/engine/plugins/match.hpp

@@ -33,7 +33,7 @@ class MatchPlugin : public BasePlugin
     {
     }
 
-    Status HandleRequest(const std::shared_ptr<datafacade::BaseDataFacade> facade,
+    Status HandleRequest(const std::shared_ptr<const datafacade::BaseDataFacade> facade,
                          const api::MatchParameters &parameters,
                          util::json::Object &json_result) const;
 

include/engine/plugins/nearest.hpp

@@ -17,7 +17,7 @@ class NearestPlugin final : public BasePlugin
   public:
     explicit NearestPlugin(const int max_results);
 
-    Status HandleRequest(const std::shared_ptr<datafacade::BaseDataFacade> facade,
+    Status HandleRequest(const std::shared_ptr<const datafacade::BaseDataFacade> facade,
                          const api::NearestParameters &params,
                          util::json::Object &result) const;
 

include/engine/plugins/table.hpp

@@ -20,7 +20,7 @@ class TablePlugin final : public BasePlugin
   public:
     explicit TablePlugin(const int max_locations_distance_table);
 
-    Status HandleRequest(const std::shared_ptr<datafacade::BaseDataFacade> facade,
+    Status HandleRequest(const std::shared_ptr<const datafacade::BaseDataFacade> facade,
                          const api::TableParameters &params,
                          util::json::Object &result) const;
 

include/engine/plugins/tile.hpp

@@ -26,7 +26,7 @@ namespace plugins
 class TilePlugin final : public BasePlugin
 {
   public:
-    Status HandleRequest(const std::shared_ptr<datafacade::BaseDataFacade> facade,
+    Status HandleRequest(const std::shared_ptr<const datafacade::BaseDataFacade> facade,
                          const api::TileParameters &parameters,
                          std::string &pbf_buffer) const;
 };

include/engine/plugins/trip.hpp

@@ -44,7 +44,7 @@ class TripPlugin final : public BasePlugin
     {
     }
 
-    Status HandleRequest(const std::shared_ptr<datafacade::BaseDataFacade> facade,
+    Status HandleRequest(const std::shared_ptr<const datafacade::BaseDataFacade> facade,
                          const api::TripParameters &parameters,
                          util::json::Object &json_result) const;
 };

include/engine/plugins/viaroute.hpp

@@ -38,7 +38,7 @@ class ViaRoutePlugin final : public BasePlugin
   public:
     explicit ViaRoutePlugin(int max_locations_viaroute);
 
-    Status HandleRequest(const std::shared_ptr<datafacade::BaseDataFacade> facade,
+    Status HandleRequest(const std::shared_ptr<const datafacade::BaseDataFacade> facade,
                          const api::RouteParameters &route_parameters,
                          util::json::Object &json_result) const;
 };