adamdebreceni commented on a change in pull request #937:
URL: https://github.com/apache/nifi-minifi-cpp/pull/937#discussion_r526640002



##########
File path: libminifi/src/FlowController.cpp
##########
@@ -70,60 +71,33 @@ namespace apache {
 namespace nifi {
 namespace minifi {
 
-#define DEFAULT_CONFIG_NAME "conf/config.yml"
-
-FlowController::FlowController(std::shared_ptr<core::Repository> 
provenance_repo, std::shared_ptr<core::Repository> flow_file_repo, 
std::shared_ptr<Configure> configure,
-                               std::unique_ptr<core::FlowConfiguration> 
flow_configuration, std::shared_ptr<core::ContentRepository> content_repo, 
const std::string name, bool headless_mode)
+FlowController::FlowController(std::shared_ptr<core::Repository> 
provenance_repo, std::shared_ptr<core::Repository> flow_file_repo,
+                               std::shared_ptr<Configure> configure, 
std::unique_ptr<core::FlowConfiguration> flow_configuration,
+                               std::shared_ptr<core::ContentRepository> 
content_repo, const std::string name, bool headless_mode,
+                               std::shared_ptr<utils::file::FileSystem> 
filesystem)
     : 
core::controller::ControllerServiceProvider(core::getClassName<FlowController>()),
-      root_(nullptr),
+      c2::C2Client(std::move(configure), std::move(provenance_repo), 
std::move(flow_file_repo),
+                   std::move(content_repo), std::move(flow_configuration), 
std::move(filesystem)),
       running_(false),
       updating_(false),
-      c2_enabled_(true),
       initialized_(false),
-      provenance_repo_(provenance_repo),
-      flow_file_repo_(flow_file_repo),
       
controller_service_map_(std::make_shared<core::controller::ControllerServiceMap>()),
       thread_pool_(2, false, nullptr, "Flowcontroller threadpool"),
-      flow_configuration_(std::move(flow_configuration)),
-      configuration_(std::move(configure)),
-      content_repo_(content_repo),
       logger_(logging::LoggerFactory<FlowController>::getLogger()) {
-  if (provenance_repo == nullptr)
+  if (IsNullOrEmpty(provenance_repo_))

Review comment:
       should I remove these newly added `IsNullOrEmpty` calls?
   
   (I agree that, with `string` it kind of made sense to use the empty string 
to indicate "no-string" (or some other special meaning), now that we have 
`optional<...>`, I am not so sure about that)




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