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ccdbaccess.cxx
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// Copyright CERN and copyright holders of ALICE O2. This software is
// distributed under the terms of the GNU General Public License v3 (GPL
// Version 3), copied verbatim in the file "COPYING".
//
// See http://alice-o2.web.cern.ch/license for full licensing information.
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
//
/// \brief A tutorial task to retrieve objects from CCDB given a run number.
/// The tutorial shows also how to use timestamps in your analysis.
/// This task requires to access the timestamp table in order to be
/// working. Currently this is done by adding `o2-analysis-timestamp`
/// to the
/// workflow
/// \author Nicolo' Jacazio
/// \since 2020-06-22
#include "Framework/runDataProcessing.h"
#include "Framework/AnalysisTask.h"
#include <CCDB/BasicCCDBManager.h>
#include "CommonDataFormat/InteractionRecord.h"
#include <chrono>
using namespace o2::framework;
using namespace o2::header;
using namespace o2;
struct TimestampUserTask {
Service<o2::ccdb::BasicCCDBManager> ccdb;
Configurable<std::string> path{"ccdb-path", "qc/TOF/TOFTaskCompressed/hDiagnostic", "path to the ccdb object"};
Configurable<std::string> url{"ccdb-url", "http://ccdb-test.cern.ch:8080", "url of the ccdb repository"};
Configurable<long> nolaterthan{"ccdb-no-later-than", std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count(), "latest acceptable timestamp of creation for the object"};
void init(o2::framework::InitContext&)
{
// Set CCDB url
ccdb->setURL(url.value);
// Enabling object caching
ccdb->setCaching(true);
// Not later than now objects
ccdb->setCreatedNotAfter(nolaterthan.value);
}
// goup BCs according to Collisions
void process(aod::BCsWithTimestamps::iterator const& bc, aod::Collisions const& collisions)
{
// skip if bc has no Collisions
LOGF(info, "Size of collisions %i", collisions.size());
if (collisions.size() == 0) {
return;
}
LOGF(info, "Getting object %s for run number %i from timestamp=%llu", path.value.data(), bc.runNumber(), bc.timestamp());
// retrieve object for given timestamp
auto obj = ccdb->getForTimeStamp<TH2F>(path.value, bc.timestamp());
if (obj) {
LOGF(info, "Found object!");
obj->Print("all");
} else {
LOGF(warning, "Object not found!");
}
}
};
WorkflowSpec defineDataProcessing(ConfigContext const& cfgc)
{
return WorkflowSpec{adaptAnalysisTask<TimestampUserTask>(cfgc, TaskName{"TimestampUserTask"})};
}