hunyadi-dev commented on a change in pull request #776:
URL: https://github.com/apache/nifi-minifi-cpp/pull/776#discussion_r428109777



##########
File path: libminifi/src/c2/C2Agent.cpp
##########
@@ -75,54 +78,55 @@ C2Agent::C2Agent(const 
std::shared_ptr<core::controller::ControllerServiceProvid
 
   c2_producer_ = [&]() {
     // place priority on messages to send to the c2 server
-      if (protocol_.load() != nullptr && 
request_mutex.try_lock_for(std::chrono::seconds(1))) {
-        std::lock_guard<std::timed_mutex> lock(request_mutex, std::adopt_lock);
-        if (!requests.empty()) {
-          int count = 0;
-          do {
-            const C2Payload payload(std::move(requests.back()));
-            requests.pop_back();
-            try {
-              C2Payload && response = 
protocol_.load()->consumePayload(payload);
-              enqueue_c2_server_response(std::move(response));
-            }
-            catch(const std::exception &e) {
-              logger_->log_error("Exception occurred while consuming payload. 
error: %s", e.what());
-            }
-            catch(...) {
-              logger_->log_error("Unknonwn exception occurred while consuming 
payload.");
-            }
-          }while(!requests.empty() && ++count < max_c2_responses);
+    if (protocol_.load() != nullptr) {
+      std::vector<C2Payload> payload_batch;
+      payload_batch.reserve(max_c2_responses);
+      auto getRequestPayload = [&payload_batch] (C2Payload&& payload) { 
payload_batch.emplace_back(std::move(payload)); };
+      const std::chrono::system_clock::time_point timeout_point = 
std::chrono::system_clock::now() + std::chrono::milliseconds(1);
+      for (std::size_t attempt_num = 0; attempt_num < max_c2_responses; 
++attempt_num) {
+        if (!requests.consumeWaitUntil(getRequestPayload, timeout_point)) {
+          break;
         }
       }
-      try {
-        performHeartBeat();
-      }
-      catch(const std::exception &e) {
-        logger_->log_error("Exception occurred while performing heartbeat. 
error: %s", e.what());
-      }
-      catch(...) {
-        logger_->log_error("Unknonwn exception occurred while performing 
heartbeat.");
-      }
+      std::for_each(
+        std::make_move_iterator(payload_batch.begin()),
+        std::make_move_iterator(payload_batch.end()),
+        [&] (C2Payload&& payload) {
+          try {
+            C2Payload && response = 
protocol_.load()->consumePayload(std::move(payload));
+            enqueue_c2_server_response(std::move(response));
+          }
+          catch(const std::exception &e) {
+            logger_->log_error("Exception occurred while consuming payload. 
error: %s", e.what());
+          }
+          catch(...) {
+            logger_->log_error("Unknonwn exception occurred while consuming 
payload.");
+          }
+        });
 
-      checkTriggers();
+        try {
+          performHeartBeat();
+        }
+        catch (const std::exception &e) {
+          logger_->log_error("Exception occurred while performing heartbeat. 
error: %s", e.what());
+        }
+        catch (...) {
+          logger_->log_error("Unknonwn exception occurred while performing 
heartbeat.");
+        }

Review comment:
       That is correct, that is one-too-many indents due to the `std::for_each` 
actually taking up two identation levels.




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