DPL: do not add summary outputs more than once

This seem to be the cause for the spurious circular dependency for
the internal-dpl-injected-dummy-sink.

Framework/Core/src/WorkflowHelpers.cxx

@@ -368,7 +368,22 @@ void WorkflowHelpers::injectServiceDevices(WorkflowSpec& workflow, ConfigContext
     bool timeframeSink = hasTimeframeInputs && !hasTimeframeOutputs;
     if (std::stoi(ctx.options().get<std::string>("timeframes-rate-limit-ipcid")) != -1) {
       if (timeframeSink && processor.name.find("internal-dpl-injected-dummy-sink") == std::string::npos) {
-        processor.outputs.push_back(OutputSpec{{"dpl-summary"}, ConcreteDataMatcher{"DPL", "SUMMARY", static_cast<DataAllocator::SubSpecificationType>(runtime_hash(processor.name.c_str()))}});
+        O2_SIGNPOST_ID_GENERATE(sid, workflow_helpers);
+        uint32_t hash = runtime_hash(processor.name.c_str());
+        bool hasMatch = false;
+        ConcreteDataMatcher summaryMatcher = ConcreteDataMatcher{"DPL", "SUMMARY", static_cast<DataAllocator::SubSpecificationType>(hash)};
+        for (auto& output : processor.outputs) {
+          if (DataSpecUtils::match(output, summaryMatcher)) {
+            O2_SIGNPOST_EVENT_EMIT(workflow_helpers, sid, "output enumeration", "%{public}s already there in %{public}s",
+                                   DataSpecUtils::describe(output).c_str(), processor.name.c_str());
+            hasMatch = true;
+            break;
+          }
+        }
+        if (!hasMatch) {
+          O2_SIGNPOST_EVENT_EMIT(workflow_helpers, sid, "output enumeration", "Adding DPL/SUMMARY/%d to %{public}s", hash, processor.name.c_str());
+          processor.outputs.push_back(OutputSpec{{"dpl-summary"}, ConcreteDataMatcher{"DPL", "SUMMARY", static_cast<DataAllocator::SubSpecificationType>(hash)}});
+        }
       }
     }
     bool hasConditionOption = false;