[ISSUE #928] Fix C++ push consumer handle error code and change demo log level (#932)

Author: lizhimins

cpp/examples/ExampleFifoProducer.cpp

@@ -105,8 +105,8 @@ int main(int argc, char* argv[]) {
   gflags::ParseCommandLineFlags(&argc, &argv, true);
 
   auto& logger = getLogger();
-  logger.setConsoleLevel(Level::Debug);
-  logger.setLevel(Level::Debug);
+  logger.setConsoleLevel(Level::Info);
+  logger.setLevel(Level::Info);
   logger.init();
 
   // Access Key/Secret pair may be acquired from management console
@@ -172,7 +172,7 @@ int main(int argc, char* argv[]) {
 
       semaphore->acquire();
       producer.send(std::move(message), callback);
-      std::cout << "Cached No." << i << " message" << std::endl;
+      // std::cout << "Cached No." << i << " message" << std::endl;
     }
   } catch (...) {
     std::cerr << "Ah...No!!!" << std::endl;

cpp/source/rocketmq/AsyncReceiveMessageCallback.cpp

@@ -51,6 +51,11 @@ void AsyncReceiveMessageCallback::onCompletion(const std::error_code& ec, const
     return;
   }
 
+  if (ec == ErrorCode::NoContent) {
+    checkThrottleThenReceive();
+    return;
+  }
+
   if (ec) {
     SPDLOG_WARN("Receive message from {} failed. Cause: {}. Retry after 1 second.", process_queue->simpleName(), ec.message());
     receiveMessageLater(std::chrono::seconds (1));

cpp/source/rocketmq/SimpleConsumerImpl.cpp

@@ -95,11 +95,11 @@ void SimpleConsumerImpl::start() {
       }
     };
 
-    // refer java sdk: set refresh interval to 30 seconds
+    // refer java sdk: set refresh interval to 5 seconds
     // org.apache.rocketmq.client.java.impl.ClientImpl#startUp
     refresh_assignment_task_ = manager()->getScheduler()->schedule(
         refresh_assignment_task, "RefreshAssignmentTask",
-        std::chrono::minutes(5), std::chrono::seconds(5));
+        std::chrono::seconds(5), std::chrono::seconds(5));
 
     client_manager_->addClientObserver(shared_from_this());
   }