Fix broken StaticContainer functionality in FairRunOnline

Added check for `fStatic` in the `FairRunOnline::EventLoop()`.
When `fStatic` is set to true by `SetContainerStatic()`,
`ReInit()` will not be called when changed `RunId` detected.

Author: karabowi

CHANGELOG.md

@@ -97,6 +97,7 @@ file an issue, so that we can see how to handle this.
 * Check the return value of `source->InitUnpackers()`/`source->ReinitUnpackers()`
   in `FairRunOnline`. Stop run if `false` returned.
 * Remove sink from Tutorial3/MQ/sampler.cxx.
+* Fixed broken `StaticContainer` functionality (do not `ReInit`ialize when `RunId` changes) in `FairRunOnline`.
 
 ### Other Notable Changes
 * Allow running without output sink. In this case even persistent branches would not be stored anywhere.

fairroot/online/steer/FairRunOnline.cxx

@@ -215,16 +215,20 @@ Int_t FairRunOnline::EventLoop()
 
     FillEventHeader();
     auto const tmpId = GetEvtHeaderRunId();
-
     if (tmpId != fRunId) {
-        LOG(info) << "FairRunOnline::EventLoop() Call Reinit due to changed RunID (from " << fRunId << " to " << tmpId;
+        LOG(info) << "FairRunOnline::EventLoop() Detected changed RunID from " << fRunId << " to " << tmpId;
         fRunId = tmpId;
-        Reinit(fRunId);
-        if (!GetSource()->ReInitUnpackers()) {
-            LOG(fatal) << "FairRunOnline->EventLoop() ReInitUnpackers() failed!";
-            return 1;
+        if (!fStatic) {
+            LOG(info) << "FairRunOnline::EventLoop() Call Reinit.";
+            Reinit(fRunId);
+            if (!GetSource()->ReInitUnpackers()) {
+                LOG(fatal) << "FairRunOnline->EventLoop() ReInitUnpackers() failed!";
+                return 1;
+            }
+            fTask->ReInitTask();
+        } else {
+            LOG(info) << "FairRunOnline::EventLoop() ReInit not called because initialisation is static.";
         }
-        fTask->ReInitTask();
     }
 
     fRootManager->StoreWriteoutBufferData(fRootManager->GetEventTime());