reduce noise in examples

examples/1-1/sink.cxx

@@ -0,0 +1,62 @@
+/********************************************************************************
+ *    Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH    *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include <fairmq/Device.h>
+#include <fairmq/runDevice.h>
+
+#include <string>
+
+namespace bpo = boost::program_options;
+
+class Sink : public FairMQDevice
+{
+  public:
+    Sink()
+        : fMaxIterations(0)
+        , fNumIterations(0)
+    {
+        // register a handler for data arriving on "data" channel
+        OnData("data", &Sink::HandleData);
+    }
+
+  protected:
+    void InitTask() override
+    {
+        // Get the fMaxIterations value from the command line options (via fConfig)
+        fMaxIterations = fConfig->GetProperty<uint64_t>("max-iterations");
+    }
+
+    bool HandleData(FairMQMessagePtr& msg, int)
+    {
+        LOG(info) << "Received: \"" << std::string(static_cast<char*>(msg->GetData()), msg->GetSize()) << "\"";
+
+        if (fMaxIterations > 0 && ++fNumIterations >= fMaxIterations) {
+            LOG(info) << "Configured maximum number of iterations reached. Leaving RUNNING state.";
+            return false;
+        }
+
+        // return true if you want the handler to be called again (otherwise return false go to the
+        // Ready state)
+        return true;
+    }
+
+  private:
+    uint64_t fMaxIterations;
+    uint64_t fNumIterations;
+};
+
+void addCustomOptions(bpo::options_description& options)
+{
+    options.add_options()
+        ("max-iterations", bpo::value<uint64_t>()->default_value(0), "Maximum number of iterations of Run/ConditionalRun/OnData (0 - infinite)");
+}
+
+std::unique_ptr<fair::mq::Device> getDevice(fair::mq::ProgOptions& /*config*/)
+{
+    return std::make_unique<Sink>();
+}