Add templates of some functional algorithms

k4ProjectTemplate/options/createExampleEventData.py

@@ -16,25 +16,23 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-from Gaudi.Configuration import *
-
+from Gaudi.Configuration import INFO
+from Configurables import CreateExampleEventData
+from Configurables import PodioOutput
+from Configurables import ApplicationMgr
 from Configurables import k4DataSvc
+
 podioevent = k4DataSvc("EventDataSvc")
 
-from Configurables import CreateExampleEventData
 producer = CreateExampleEventData()
 
-from Configurables import PodioOutput
 out = PodioOutput("out")
 out.filename = "output_k4test_exampledata.root"
 out.outputCommands = ["keep *"]
 
-from Configurables import ApplicationMgr
-ApplicationMgr( TopAlg=[producer, out],
-                EvtSel="NONE",
-                EvtMax=100,
-                ExtSvc=[podioevent],
-                OutputLevel=INFO,
-                )
-
-
+ApplicationMgr(TopAlg=[producer, out],
+               EvtSel="NONE",
+               EvtMax=100,
+               ExtSvc=[podioevent],
+               OutputLevel=INFO,
+               )

k4ProjectTemplate/options/readExampleEventData.py

@@ -16,19 +16,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-from Gaudi.Configuration import *
-
+from Gaudi.Configuration import DEBUG
 from Configurables import k4DataSvc
+from Configurables import CreateExampleEventData
+from Configurables import PodioInput
+from Configurables import ApplicationMgr
+
 podioevent = k4DataSvc("EventDataSvc")
 podioevent.input = "output_k4test_exampledata.root"
-from Configurables import CreateExampleEventData
 producer = CreateExampleEventData()
 
-from Configurables import PodioInput
 inp = PodioInput("InputReader")
-inp.collections = ["MCParticles", "SimTrackerHit"]
+inp.collections = ["ExampleParticles"]
 
-from Configurables import ApplicationMgr
 ApplicationMgr( TopAlg=[inp],
                 EvtSel="NONE",
                 EvtMax=100,

k4ProjectTemplate/src/components/CreateExampleEventData.cpp

@@ -16,49 +16,30 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include "CreateExampleEventData.h"
 
-// datamodel
-#include "edm4hep/MCParticleCollection.h"
-#include "edm4hep/SimTrackerHitCollection.h"
-
-DECLARE_COMPONENT(CreateExampleEventData)
-
-CreateExampleEventData::CreateExampleEventData(const std::string& aName, ISvcLocator* aSvcLoc)
-    : GaudiAlgorithm(aName, aSvcLoc) {
-  declareProperty("mcparticles", m_mcParticleHandle, "Dummy Particle collection (output)");
-  declareProperty("trackhits", m_simTrackerHitHandle, "Dummy Hit collection (output)");
-}
-
-CreateExampleEventData::~CreateExampleEventData() {}
+#include "Gaudi/Property.h"
+#include "GaudiAlg/Producer.h"
 
-StatusCode CreateExampleEventData::initialize() {
-  if (GaudiAlgorithm::initialize().isFailure()) {
-    return StatusCode::FAILURE;
-  }
-  return StatusCode::SUCCESS;
-}
-
-StatusCode CreateExampleEventData::execute() {
-  auto* floatVector = m_vectorFloatHandle.createAndPut();
-  floatVector->push_back(125.);
-  floatVector->push_back(25.);
+// Define BaseClass_t
+#include "k4FWCore/BaseClass.h"
 
-  edm4hep::MCParticleCollection* particles = m_mcParticleHandle.createAndPut();
+#include "edm4hep/MCParticleCollection.h"
 
-  auto particle = particles->create();
+#include <string>
 
-  auto& p4 = particle.momentum();
-  p4.x     = m_magicNumberOffset + 5;
-  p4.y     = m_magicNumberOffset + 6;
-  p4.z     = m_magicNumberOffset + 7;
-  particle.setMass(m_magicNumberOffset + 8);
+struct CreateExampleEventData final : Gaudi::Functional::Producer<edm4hep::MCParticleCollection(), BaseClass_t> {
+  CreateExampleEventData(const std::string& name, ISvcLocator* svcLoc)
+      : Producer(name, svcLoc, KeyValue("OutputLocation", "ExampleParticles")) {}
 
-  auto* hits = m_simTrackerHitHandle.createAndPut();
-  auto  hit  = hits->create();
-  hit.setPosition({3, 4, 5});
+  edm4hep::MCParticleCollection operator()() const override {
+    auto coll     = edm4hep::MCParticleCollection();
+    auto particle = coll.create();
+    particle.setMass(m_exampleEnergy);
+    info() << "Producing a particle with mass = " << m_exampleEnergy << " GeV" << endmsg;
+    return coll;
+  }
 
-  return StatusCode::SUCCESS;
-}
+  Gaudi::Property<double> m_exampleEnergy{this, "ExampleEnergy", 3, "Example int to be produced"};
+};
 
-StatusCode CreateExampleEventData::finalize() { return GaudiAlgorithm::finalize(); }
+DECLARE_COMPONENT(CreateExampleEventData)

k4ProjectTemplate/src/components/EmptyAlg.h → k4ProjectTemplate/src/components/ExampleConsumer.cpp

@@ -16,30 +16,20 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#pragma once
 
-// GAUDI
 #include "Gaudi/Property.h"
-#include "GaudiAlg/GaudiAlgorithm.h"
+#include "GaudiAlg/Consumer.h"
 
-class EmptyAlg : public GaudiAlgorithm {
-public:
-  explicit EmptyAlg(const std::string&, ISvcLocator*);
-  virtual ~EmptyAlg();
-  /**  Initialize.
-   *   @return status code
-   */
-  virtual StatusCode initialize() final;
-  /**  Execute.
-   *   @return status code
-   */
-  virtual StatusCode execute() final;
-  /**  Finalize.
-   *   @return status code
-   */
-  virtual StatusCode finalize() final;
+// Define BaseClass_t
+#include "k4FWCore/BaseClass.h"
 
-private:
-  // member variable
-  int m_member = 0;
+#include <string>
+
+struct ExampleConsumer final : Gaudi::Functional::Consumer<void(const int&), BaseClass_t> {
+  ExampleConsumer(const std::string& name, ISvcLocator* svcLoc)
+      : Consumer(name, svcLoc, KeyValue("ExampleConsumerInputLocation", "/ExampleInt")) {}
+
+  void operator()(const int& input) const override { info() << "ExampleInt = " << input << endmsg; }
 };
+
+DECLARE_COMPONENT(ExampleConsumer)

k4ProjectTemplate/src/components/EmptyAlg.cpp → k4ProjectTemplate/src/components/ExampleTransformer.cpp

@@ -16,16 +16,24 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include "EmptyAlg.h"
 
-DECLARE_COMPONENT(EmptyAlg)
+#include "Gaudi/Property.h"
+#include "GaudiAlg/Transformer.h"
 
-EmptyAlg::EmptyAlg(const std::string& aName, ISvcLocator* aSvcLoc) : GaudiAlgorithm(aName, aSvcLoc) {}
+// Define BaseClass_t
+#include "k4FWCore/BaseClass.h"
 
-EmptyAlg::~EmptyAlg() {}
+#include <string>
 
-StatusCode EmptyAlg::initialize() { return StatusCode::SUCCESS; }
+struct ExampleTransformer final : Gaudi::Functional::Transformer<int(const int&), BaseClass_t> {
+  ExampleTransformer(const std::string& name, ISvcLocator* svcLoc)
+      : Transformer(name, svcLoc, KeyValue("ExampleTransformerInputLocation", "/InputExampleInt"),
+                    {KeyValue("ExampleTransformerOutputLocation", "/OutputExampleInt")}) {}
 
-StatusCode EmptyAlg::execute() { return StatusCode::SUCCESS; }
+  int operator()(const int& input) const override {
+    info() << "ExampleInt = " << input << endmsg;
+    return input + 1;
+  }
+};
 
-StatusCode EmptyAlg::finalize() { return StatusCode::SUCCESS; }
+DECLARE_COMPONENT(ExampleTransformer)

k4ProjectTemplate/src/components/HelloWorldAlg.cpp

@@ -21,18 +21,18 @@
 
 DECLARE_COMPONENT(HelloWorldAlg)
 
-HelloWorldAlg::HelloWorldAlg(const std::string& aName, ISvcLocator* aSvcLoc) : GaudiAlgorithm(aName, aSvcLoc) {}
+HelloWorldAlg::HelloWorldAlg(const std::string& aName, ISvcLocator* aSvcLoc) : Gaudi::Algorithm(aName, aSvcLoc) {}
 
 HelloWorldAlg::~HelloWorldAlg() {}
 
 StatusCode HelloWorldAlg::initialize() {
-  if (GaudiAlgorithm::initialize().isFailure()) {
+  if (Gaudi::Algorithm::initialize().isFailure()) {
     return StatusCode::FAILURE;
   }
   return StatusCode::SUCCESS;
 }
 
-StatusCode HelloWorldAlg::execute() {
+StatusCode HelloWorldAlg::execute(const EventContext& ctx) const {
   info() << endmsg;
   info() << endmsg;
   info() << theMessage << endmsg;
@@ -41,4 +41,4 @@ StatusCode HelloWorldAlg::execute() {
   return StatusCode::SUCCESS;
 }
 
-StatusCode HelloWorldAlg::finalize() { return GaudiAlgorithm::finalize(); }
+StatusCode HelloWorldAlg::finalize() { return Gaudi::Algorithm::finalize(); }

k4ProjectTemplate/src/components/HelloWorldAlg.h

@@ -16,36 +16,33 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#ifndef TESTFWCORE_HELLOWORLDALG
-#define TESTFWCORE_HELLOWORLDALG
 
-#pragma once
+// Note that in most cases it's better to use the functional
+// approach than Gaudi::Algorithm
 
 // GAUDI
+#include "Gaudi/Algorithm.h"
 #include "Gaudi/Property.h"
-#include "GaudiAlg/GaudiAlgorithm.h"
 
-class HelloWorldAlg : public GaudiAlgorithm {
+class HelloWorldAlg : public Gaudi::Algorithm {
 public:
-  explicit HelloWorldAlg(const std::string&, ISvcLocator*);
+  HelloWorldAlg(const std::string&, ISvcLocator*);
   virtual ~HelloWorldAlg();
   /**  Initialize.
    *   @return status code
    */
-  virtual StatusCode initialize() final;
+  StatusCode initialize() override;
   /**  Execute.
    *   @return status code
    */
-  virtual StatusCode execute() final;
+  StatusCode execute(const EventContext&) const override;
   /**  Finalize.
    *   @return status code
    */
-  virtual StatusCode finalize() final;
+  StatusCode finalize() override;
 
 private:
   // member variable
   Gaudi::Property<std::string> theMessage{this, "PerEventPrintMessage", "Hello ",
                                           "The message to printed for each Event"};
 };
-
-#endif /* TESTFWCORE_HELLOWORLDALG */