TrigConfBunchCrossingToolEventLoop < Sandbox

---+ Using TrigConfBunchCrossingTool from EventLoop

The following explains the procedure on how to setup the TrigConfBunchCrossingTool to access BC information from inside EventLoop. This has been tested in AnalysisBase 2.4.28 with TrigBunchCrossingTool -00-04-20.
---++ Small fix in TrigBunchCrossingTool

A local instance of the TrigBunchCrossingTool is required as a minor change needs to be applied within the tool to make it work within EventLoop
<pre>rc checkout_pkg TrigBunchCrossingTool</pre>

Now open TrigBunchCrossingTool /Root/TrigConfBunchCrossingTool.cxx. Line 47 reads
<verbatim>m_configTool( "TrigConf::xAODConfigTool" ) {</verbatim>

and change this to
<verbatim>m_configTool( "xAODConfigTool" ) {</verbatim>
---++ Setting up the tool in EventLoop

Include the needed dependencies in cmt/Makefile.RootCore

<verbatim>PACKAGE_DEP = [...] TrigBunchCrossingTool TrigConfxAOD TrigConfHLTDat</verbatim>

where [...] stands for all other dependencies. In the *.h file of the package we add the following three headers

<verbatim>#include "TrigConfxAOD/xAODConfigTool.h"
#include "TrigConfInterfaces/ITrigConfigTool.h"
#include "TrigBunchCrossingTool/TrigConfBunchCrossingTool.h"</verbatim>

and in public: declare both a new instance of the trigger configuration tool and the BC tool

<verbatim>xAODConfigTool *m_configTool;                                             //!
Trig::TrigConfBunchCrossingTool *m_trigConfBunchCrossingTool;             //!</verbatim>

Now we look into the packages source code in *.cxx. Add the following lines to the initialize() function:

<verbatim>// Trigger configuration tool
m_configTool = new xAODConfigTool("xAODConfigTool");
ToolHandle<TrigConf::ITrigConfigTool> configHandle( m_configTool );
ANA_CHECK( configHandle->initialize() );

// BunchCrossingTool
m_trigConfBunchCrossingTool = new Trig::TrigConfBunchCrossingTool("TrigConfBunchCrossingTool");
m_trigConfBunchCrossingTool->setProperty( "OutputLevel", MSG::INFO);
ANA_CHECK( m_trigConfBunchCrossingTool->initialize() );</verbatim>
---++ Using the BC tool

Bunch crossing information can be easily read in the execute(), e.g. to check whether a BC was filled ones needs to put in the BCID of the collision

<verbatim>const bool result = m_trigConfBunchCrossingTool->isFilled( eventInfo->bcid() );</verbatim>

The available functions can be seen from TrigBunchCrossingTool /TrigBunchCrossingTool/BunchCrossingToolBase.h

-- Main.JochenJensHeinrich - 2017-05-10

Topic revision: r1 - 2017-05-10 - JochenJensHeinrich

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