reduce noise in examples

examples/multiple-channels/sampler.cxx

@@ -0,0 +1,81 @@
+/********************************************************************************
+ *    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 <FairMQPoller.h>
+#include <fairmq/runDevice.h>
+
+#include <chrono>
+#include <string>
+#include <thread> // this_thread::sleep_for
+
+namespace bpo = boost::program_options;
+
+class Sampler : public FairMQDevice
+{
+  public:
+    Sampler()
+        : fMaxIterations(0)
+        , fNumIterations(0)
+    {}
+
+    void InitTask() override
+    {
+        fText = fConfig->GetProperty<std::string>("text");
+        fMaxIterations = fConfig->GetProperty<uint64_t>("max-iterations");
+    }
+
+    void Run() override
+    {
+        FairMQPollerPtr poller(NewPoller("data", "broadcast"));
+
+        while (!NewStatePending()) {
+            poller->Poll(100);
+
+            if (poller->CheckInput("broadcast", 0)) {
+                FairMQMessagePtr msg(NewMessage());
+
+                if (Receive(msg, "broadcast") > 0) {
+                    LOG(info) << "Received broadcast: \"" << std::string(static_cast<char*>(msg->GetData()), msg->GetSize()) << "\"";
+                }
+            }
+
+            if (poller->CheckOutput("data", 0)) {
+                std::this_thread::sleep_for(std::chrono::seconds(1));
+
+                FairMQMessagePtr msg(NewSimpleMessage(fText));
+
+                if (Send(msg, "data") > 0) {
+                    LOG(info) << "Sent \"" << fText << "\"";
+
+                    if (fMaxIterations > 0 && ++fNumIterations >= fMaxIterations) {
+                        LOG(info) << "Configured maximum number of iterations reached. Leaving RUNNING state.";
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+  protected:
+    std::string fText;
+    uint64_t fMaxIterations;
+    uint64_t fNumIterations;
+};
+
+void addCustomOptions(bpo::options_description& options)
+{
+    options.add_options()
+        ("text", bpo::value<std::string>()->default_value("Hello"), "Text to send out")
+        ("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<Sampler>();
+}