reduce noise in examples

examples/multiple-transports/sampler1.cxx

@@ -0,0 +1,89 @@
+/********************************************************************************
+ *    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 <thread>
+
+namespace bpo = boost::program_options;
+
+class Sampler1 : public FairMQDevice
+{
+  public:
+    Sampler1()
+        : fAckListener()
+        , fMaxIterations(0)
+        , fNumIterations(0)
+    {}
+
+  protected:
+    void InitTask() override
+    {
+        fMaxIterations = fConfig->GetProperty<uint64_t>("max-iterations");
+    }
+
+    void PreRun() override
+    {
+        fAckListener = std::thread(&Sampler1::ListenForAcks, this);
+    }
+
+    bool ConditionalRun() override
+    {
+        // Creates a message using the transport of channel data1
+        FairMQMessagePtr msg(NewMessageFor("data1", 0, 1000000));
+
+        // in case of error or transfer interruption, return false to go to IDLE state
+        // successfull transfer will return number of bytes transfered (can be 0 if sending an empty message).
+        if (Send(msg, "data1") < 0) {
+            return false;
+        }
+
+        if (fMaxIterations > 0 && ++fNumIterations >= fMaxIterations) {
+            LOG(info) << "Configured maximum number of iterations reached. Leaving RUNNING state.";
+            return false;
+        }
+
+        return true;
+    }
+
+    void PostRun() override
+    {
+        fAckListener.join();
+    }
+
+    void ListenForAcks()
+    {
+        uint64_t numAcks = 0;
+
+        while (!NewStatePending()) {
+            FairMQMessagePtr ack(NewMessageFor("ack", 0));
+            if (Receive(ack, "ack") < 0) {
+                break;
+            }
+            ++numAcks;
+        }
+
+        LOG(info) << "Acknowledged " << numAcks << " messages";
+    }
+
+    std::thread fAckListener;
+    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<Sampler1>();
+}