AlgorithmManager.cpp

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// Include files
#include "AlgorithmManager.h"
#include "GaudiKernel/IAlgorithm.h"
#include "GaudiKernel/Algorithm.h"
#include "GaudiKernel/ISvcLocator.h"
#include "GaudiKernel/System.h"
#include "GaudiKernel/MsgStream.h"
#include "GaudiKernel/TypeNameString.h"
#include <iostream>
#ifndef _WIN32
#include <errno.h>
#endif

static SmartIF<IAlgorithm> no_algorithm;

// constructor
AlgorithmManager::AlgorithmManager(IInterface* application):
  base_class(application, IAlgorithm::interfaceID())
{
  addRef(); // Initial count set to 1
}

// addAlgorithm
StatusCode AlgorithmManager::addAlgorithm(IAlgorithm* alg) {
  m_algs.push_back(alg);
  return StatusCode::SUCCESS;
}

// removeAlgorithm
StatusCode AlgorithmManager::removeAlgorithm(IAlgorithm* alg) {
  auto it = std::find(m_algs.begin(), m_algs.end(), alg);
  if (it != m_algs.end()) {
    m_algs.erase(it);
    return StatusCode::SUCCESS;
  }
  return StatusCode::FAILURE;
}

// createService
StatusCode AlgorithmManager::createAlgorithm( const std::string& algtype,
                                              const std::string& algname,
                                              IAlgorithm*& algorithm,
                                              bool managed,
                                              bool checkIfExists)
{
  // Check is the algorithm is already existing
  if (checkIfExists) {
    if( existsAlgorithm( algname ) ) {
      // return an error because an algorithm with that name already exists
      return StatusCode::FAILURE;
    }
  }
  std::string actualalgtype(algtype);
  // a '\' in front of the type name prevents alias replacement
  if ((actualalgtype.size() > 8) && (actualalgtype.compare(0, 8,"unalias:") == 0)) {
    actualalgtype = actualalgtype.substr(8);
  } else {
    auto typeAlias = m_algTypeAliases.find(algtype);
    if (typeAlias != m_algTypeAliases.end()) {
      actualalgtype = typeAlias->second;
    }
  }
  algorithm = Algorithm::Factory::create(actualalgtype, algname, serviceLocator().get());
  if ( !algorithm )  {
      this->error() << "Algorithm of type " << actualalgtype
                    << " is unknown (No factory available)." << endmsg;
#ifndef _WIN32
      errno = 0xAFFEDEAD; // code used by Gaudi for library load errors: forces getLastErrorString do use dlerror (on Linux)
#endif
      std::string err = System::getLastErrorString();
      if (! err.empty()) this->error() << err << endmsg;
      this->error() << "More information may be available by setting the global jobOpt \"PluginDebugLevel\" to 1" << endmsg;
      return StatusCode::FAILURE;
  }
  // Check the compatibility of the version of the interface obtained
  if( !isValidInterface(algorithm) ) {
    fatal() << "Incompatible interface IAlgorithm version for " << actualalgtype << endmsg;
    return StatusCode::FAILURE;
  }
  m_algs.emplace_back(algorithm, managed);
  // let the algorithm know its type
  algorithm->setType(algtype);
  // this is needed to keep the reference count correct, since isValidInterface(algorithm)
  // implies an increment of the counter by 1
  algorithm->release();
  StatusCode rc;
  if ( managed ) {
    // Bring the created algorithm to the same state of the ApplicationMgr
    if (FSMState() >= Gaudi::StateMachine::INITIALIZED) {
      rc = algorithm->sysInitialize();
      if (rc.isSuccess() && FSMState() >= Gaudi::StateMachine::RUNNING) {
        rc = algorithm->sysStart();
      }
    }
    if ( !rc.isSuccess() )  {
      this->error() << "Failed to initialize algorithm: [" << algname << "]" << endmsg;
    }
  }
  return rc;
}

SmartIF<IAlgorithm>& AlgorithmManager::algorithm(const Gaudi::Utils::TypeNameString &typeName, const bool createIf) {
  auto it = std::find(m_algs.begin(), m_algs.end(), typeName.name());
  if (it != m_algs.end()) { // found
    return it->algorithm;
  }
  if (createIf) {
    IAlgorithm* alg;
    if (createAlgorithm(typeName.type(), typeName.name(), alg, true).isSuccess()) {
      return algorithm(typeName, false);
    }
  }
  return no_algorithm;
}

// existsAlgorithm
bool AlgorithmManager::existsAlgorithm(const std::string& name) const {
  return  m_algs.end() != std::find(m_algs.begin(), m_algs.end(), name);
}

  // Return the list of Algorithms
const std::vector<IAlgorithm*>& AlgorithmManager::getAlgorithms() const
{
  m_listOfPtrs.clear();
  m_listOfPtrs.reserve(m_algs.size());
  std::transform( std::begin(m_algs), std::end(m_algs),
                  std::back_inserter(m_listOfPtrs),
                  [](const AlgorithmItem& alg) {
                      return const_cast<IAlgorithm*>(alg.algorithm.get());
                  } );
  return m_listOfPtrs;
}

StatusCode AlgorithmManager::initialize() {
  StatusCode rc;
  for (auto& it : m_algs ) {
    if (!it.managed) continue;
    rc = it.algorithm->sysInitialize();
    if ( rc.isFailure() ) return rc;
  }
  return rc;
}

StatusCode AlgorithmManager::start() {
  StatusCode rc;
  for (auto& it : m_algs ) {
    if (!it.managed) continue;
    rc = it.algorithm->sysStart();
    if ( rc.isFailure() ) return rc;
  }
  return rc;
}

StatusCode AlgorithmManager::stop() {
  StatusCode rc;
  for (auto& it : m_algs) {
    if (!it.managed) continue;
    rc = it.algorithm->sysStop();
    if ( rc.isFailure() ) return rc;
  }
  return rc;
}

StatusCode AlgorithmManager::finalize() {
  StatusCode rc;
  auto it = m_algs.begin();
  while (it != m_algs.end()){ // finalize and remove from the list the managed algorithms
    if (it->managed) {
      rc = it->algorithm->sysFinalize();
      if( rc.isFailure() ) return rc;
      it = m_algs.erase(it);
    } else {
      ++it;
    }
  }
  return rc;
}

StatusCode AlgorithmManager::reinitialize() {
  StatusCode rc;
  for (auto& it : m_algs ) {
    if (!it.managed) continue;
    rc = it.algorithm->sysReinitialize();
    if( rc.isFailure() ){
      this->error() << "Unable to re-initialize algorithm: " << it.algorithm->name() << endmsg;
      return rc;
    }
  }
  return rc;
}

StatusCode AlgorithmManager::restart() {
  StatusCode rc;
  for (auto& it : m_algs ) {
    if (!it.managed) continue;
    rc = it.algorithm->sysRestart();
    if( rc.isFailure() ){
      this->error() << "Unable to re-initialize algorithm: " << it.algorithm->name() << endmsg;
      return rc;
    }
  }
  return rc;
}