[u/mrichter/AliRoot.git] / FMD / AliFMDDigitizer.cxx

/**************************************************************************
 * Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
/* $Id$ */
/** @file    AliFMDDigitizer.cxx
    @author  Christian Holm Christensen <cholm@nbi.dk>
    @date    Mon Mar 27 12:38:26 2006
    @brief   FMD Digitizers implementation
    @ingroup FMD_sim
*/
//////////////////////////////////////////////////////////////////////////////
//
//  This class contains the procedures simulation ADC  signal for the
//  Forward Multiplicity detector  : SDigits->Digits
// 
//  Digits consists of
//   - Detector #
//   - Ring ID                                             
//   - Sector #     
//   - Strip #
//   - ADC count in this channel                                  
//
//  Digits consists of
//   - Detector #
//   - Ring ID                                             
//   - Sector #     
//   - Strip #
//   - Total energy deposited in the strip
//   - ADC count in this channel                                  
//
// As the Digits and SDigits have so much in common, the classes
// AliFMDDigitizer and AliFMDSDigitizer are implemented via a base
// class AliFMDBaseDigitizer.
//
//                 +---------------------+
//                 | AliFMDBaseDigitizer |
//                 +---------------------+
//                           ^
//                           |
//                +----------+---------+
//                |                    |
//      +-----------------+     +------------------+
//      | AliFMDDigitizer |	| AliFMDSDigitizer |
//      +-----------------+	+------------------+
//                |
//     +-------------------+
//     | AliFMDSSDigitizer |
//     +-------------------+
//
// These classes has several paramters: 
//
//     fPedestal
//     fPedestalWidth
//         (Only AliFMDDigitizer)
//         Mean and width of the pedestal.  The pedestal is simulated
//         by a Guassian, but derived classes my override MakePedestal
//         to simulate it differently (or pick it up from a database).
//
//     fVA1MipRange
//         The dymamic MIP range of the VA1_ALICE pre-amplifier chip 
//
//     fAltroChannelSize
//         The largest number plus one that can be stored in one
//         channel in one time step in the ALTRO ADC chip. 
//
//     fSampleRate
//         How many times the ALTRO ADC chip samples the VA1_ALICE
//         pre-amplifier signal.   The VA1_ALICE chip is read-out at
//         10MHz, while it's possible to drive the ALTRO chip at
//         25MHz.  That means, that the ALTRO chip can have time to
//         sample each VA1_ALICE signal up to 2 times.  Although it's
//         not certain this feature will be used in the production,
//         we'd like have the option, and so it should be reflected in
//         the code.
//
//
// The shaping function of the VA1_ALICE is generally given by 
//
//      f(x) = A(1 - exp(-Bx))
//
// where A is the total charge collected in the pre-amp., and B is a
// paramter that depends on the shaping time of the VA1_ALICE circut.
// 
// When simulating the shaping function of the VA1_ALICe
// pre-amp. chip, we have to take into account, that the shaping
// function depends on the previous value of read from the pre-amp. 
//
// That results in the following algorithm:
//
//    last = 0;
//    FOR charge IN pre-amp. charge train DO 
//      IF last < charge THEN 
//        f(t) = (charge - last) * (1 - exp(-B * t)) + last
//      ELSE
//        f(t) = (last - charge) * exp(-B * t) + charge)
//      ENDIF
//      FOR i IN # samples DO 
//        adc_i = f(i / (# samples))
//      DONE
//      last = charge
//   DONE
//
// Here, 
//
//   pre-amp. charge train 
//       is a series of 128 charges read from the VA1_ALICE chip
//
//   # samples
//       is the number of times the ALTRO ADC samples each of the 128
//       charges from the pre-amp. 
//
// Where Q is the total charge collected by the VA1_ALICE
// pre-amplifier.   Q is then given by 
//
//           E S 
//      Q =  - -
//           e R
//
// where E is the total energy deposited in a silicon strip, R is the
// dynamic range of the VA1_ALICE pre-amp (fVA1MipRange), e is the
// energy deposited by a single MIP, and S ALTRO channel size in each
// time step (fAltroChannelSize).  
//
// The energy deposited per MIP is given by 
//
//      e = M * rho * w 
//
// where M is the universal number 1.664, rho is the density of
// silicon, and w is the depth of the silicon sensor. 
//
// The final ADC count is given by 
//
//      C' = C + P
//
// where P is the (randomized) pedestal (see MakePedestal)
//
// This class uses the class template AliFMDMap<Type> to make an
// internal cache of the energy deposted of the hits.  The class
// template is instantasized as 
//
//  typedef AliFMDMap<std::pair<Float_t, UShort_t> > AliFMDEdepMap;
//
// The first member of the values is the summed energy deposition in a
// given strip, while the second member of the values is the number of
// hits in a given strip.  Using the second member, it's possible to
// do some checks on just how many times a strip got hit, and what
// kind of error we get in our reconstructed hits.  Note, that this
// information is currently not written to the digits tree.  I think a
// QA (Quality Assurance) digit tree is better suited for that task.
// However, the information is there to be used in the future. 
//
//
// Latest changes by Christian Holm Christensen
//
//////////////////////////////////////////////////////////////////////////////

//      /1
//      |           A(-1 + B + exp(-B))
//      | f(x) dx = ------------------- = 1
//      |                    B
//      / 0
//
// and B is the a parameter defined by the shaping time (fShapingTime).  
//
// Solving the above equation, for A gives
//
//                 B
//      A = ----------------
//          -1 + B + exp(-B)
//
// So, if we define the function g: [0,1] -> [0:1] by 
//
//               / v
//               |              Bu + exp(-Bu) - Bv - exp(-Bv) 
//      g(u,v) = | f(x) dx = -A -----------------------------
//               |                            B
//               / u
//
// we can evaluate the ALTRO sample of the VA1_ALICE pre-amp between
// any two times (u, v), by 
//       
//
//                                B	    Bu + exp(-Bu) - Bv - exp(-Bv)
//      C = Q g(u,v) = - Q ---------------- -----------------------------
//		           -1 + B + exp(-B)              B	            
//
//               Bu + exp(-Bu) - Bv - exp(-Bv) 
//        = -  Q -----------------------------
//                    -1 + B + exp(-B)
//

#include <TTree.h>		// ROOT_TTree
#include <TFile.h>
#include "AliFMDDebug.h" 	// Better debug macros
#include "AliFMDDigitizer.h"	// ALIFMDSSDIGITIZER_H
#include "AliFMD.h"		// ALIFMD_H
#include "AliFMDSDigit.h"	// ALIFMDDIGIT_H
#include "AliFMDDigit.h"	// ALIFMDDIGIT_H
#include "AliFMDParameters.h"   // ALIFMDPARAMETERS_H
#include <AliRunDigitizer.h>	// ALIRUNDIGITIZER_H
#include <AliRun.h>		// ALIRUN_H
#include <AliLoader.h>		// ALILOADER_H
#include <AliRunLoader.h>	// ALIRUNLOADER_H
    
//====================================================================
ClassImp(AliFMDDigitizer)
#if 0
;
#endif

//____________________________________________________________________
Bool_t
AliFMDDigitizer::Init()
{
  // Initialisation
  if (!AliFMDBaseDigitizer::Init()) return kFALSE;
  
#if 0
  // Get the AliRun object 
  AliRun* run = fRunLoader->GetAliRun();
  if (!run) { 
    AliWarning("Loading gAlice");
    fRunLoader->LoadgAlice();
    if (!run) { 
      AliError("Can not get Run from Run Loader");
      return kFALSE;
    }
  }
  
  // Get the AliFMD object 
  fFMD = static_cast<AliFMD*>(run->GetDetector("FMD"));
  if (!fFMD) {
    AliError("Can not get FMD from gAlice");
    return kFALSE;
  }  
#endif
  return kTRUE;
}


//____________________________________________________________________
void
AliFMDDigitizer::Exec(Option_t*)
{
  if (!fManager) { 
    AliError("No digitisation manager defined");
    return;
  }

  // Clear array of deposited energies 
  fEdep.Reset();

  AliRunLoader* runLoader = 0;
  if (!gAlice) { 
    TString folderName(fManager->GetInputFolderName(0));
    runLoader = AliRunLoader::GetRunLoader(folderName.Data());
    if (!runLoader) { 
      AliError(Form("Failed at getting run loader from %s",
		    folderName.Data()));
      return;
    }
    if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
    runLoader->GetAliRun();
  }
  if (!gAlice) { 
    AliError("Can not get Run from Run Loader");
    return;
  }
  
  // Get the AliFMD object 
  fFMD = static_cast<AliFMD*>(gAlice->GetDetector("FMD"));
  if (!fFMD) {
    AliError("Can not get FMD from gAlice");
    return;
  }  


  // Loop over input files
  Int_t nFiles= fManager->GetNinputs();
  AliFMDDebug(1, (" Digitizing event number %d, got %d inputs",
		  fManager->GetOutputEventNr(), nFiles));
  for (Int_t inputFile = 0; inputFile < nFiles; inputFile++) {
    AliFMDDebug(5, ("Now reading input # %d", inputFile));
    // Get the current loader 
    AliRunLoader* currentLoader = 
      AliRunLoader::GetRunLoader(fManager->GetInputFolderName(inputFile));
    if (!currentLoader) { 
      Error("Exec", Form("no run loader for input file # %d", inputFile));
      continue;
    }

    // Cache contriutions 
    AliFMDDebug(5, ("Now summing the contributions from input # %d",inputFile));

    // Get the FMD loader 
    AliLoader* inFMD = currentLoader->GetLoader("FMDLoader");
    // And load the summable digits
    inFMD->LoadSDigits("READ");
  
    // Get the tree of summable digits
    TTree* sdigitsTree = inFMD->TreeS();
    if (!sdigitsTree)  {
      AliError("No sdigit tree from manager");
      continue;
    }
    if (AliLog::GetDebugLevel("FMD","") >= 10) {
      TFile* file = sdigitsTree->GetCurrentFile();
      if (!file) {
	AliWarning("Input tree has no file!");
      }
      else { 
	AliFMDDebug(10, ("Input tree file %s content:", file->GetName()));
	file->ls();
      }
      // AliFMDDebug(5, ("Input tree %s file structure:", 
      //                 sdigitsTree->GetName()));
      // sdigitsTree->Print();
    }

    // Get the FMD branch 
    TBranch* sdigitsBranch = sdigitsTree->GetBranch("FMD");
    if (!sdigitsBranch) {
      AliError("Failed to get sdigit branch");
      return;
    }

    // Set the branch addresses 
    fFMD->SetTreeAddress();

    // Sum contributions from the sdigits
    AliFMDDebug(3, ("Will now sum contributions from SDigits"));
    SumContributions(sdigitsBranch);

    // Unload the sdigits
    inFMD->UnloadSDigits();
  }  

  TString       outFolder(fManager->GetOutputFolderName());
  AliRunLoader* out    = AliRunLoader::GetRunLoader(outFolder.Data());
  AliLoader*    outFMD = out->GetLoader("FMDLoader");
  if (!outFMD) { 
    AliError("Cannot get the FMDLoader output folder");
    return;
  }
  TTree* outTree = MakeOutputTree(outFMD);
  if (!outTree) { 
    AliError("Failed to get output tree");
    return;
  }
  // Set the branch address 
  fFMD->SetTreeAddress();
  
  // And digitize the cached data 
  DigitizeHits();
  
  // Fill the tree
  Int_t write = outTree->Fill();
  AliFMDDebug(5, ("Wrote %d bytes to digit tree", write));
  
  // Store the digits
  StoreDigits(outFMD);
}

//____________________________________________________________________
void
AliFMDDigitizer::SumContributions(TBranch* sdigitsBranch) 
{
  // Sum energy deposited contributions from each sdigits in a cache
  // (fEdep).  
  AliFMDDebug(3, ("Runnin our version of SumContributions"));

  // Get a list of hits from the FMD manager 
  TClonesArray *fmdSDigits = fFMD->SDigits();
  
  // Get number of entries in the tree 
  Int_t nevents  = Int_t(sdigitsBranch->GetEntries());
  
  Int_t read = 0;
  // Loop over the events in the 
  for (Int_t event = 0; event < nevents; event++)  {
    // Read in entry number `event' 
    read += sdigitsBranch->GetEntry(event);
    
    // Get the number of sdigits 
    Int_t nsdigits = fmdSDigits->GetEntries ();
    AliFMDDebug(3, ("Got %5d SDigits", nsdigits));
    for (Int_t sdigit = 0; sdigit < nsdigits; sdigit++) {
      // Get the sdigit number `sdigit'
      AliFMDSDigit* fmdSDigit = 
	static_cast<AliFMDSDigit*>(fmdSDigits->UncheckedAt(sdigit));

      AliFMDDebug(5, ("Adding contribution of %d tracks", 
		      fmdSDigit->GetNTrack()));
      AliFMDDebug(15, ("Contrib from FMD%d%c[%2d,%3d] (%s) from track %d", 
		       fmdSDigit->Detector(),
		       fmdSDigit->Ring(),
		       fmdSDigit->Sector(),
		       fmdSDigit->Strip(),
		       fmdSDigit->GetName(), 
		       fmdSDigit->GetTrack(0)));
      
      // Extract parameters 
      AddContribution(fmdSDigit->Detector(),
		      fmdSDigit->Ring(),
		      fmdSDigit->Sector(),
		      fmdSDigit->Strip(),
		      fmdSDigit->Edep(), 
		      kTRUE,
		      fmdSDigit->GetNTrack(),
		      fmdSDigit->GetTracks());
    }  // sdigit loop
  } // event loop


  AliFMDDebug(3, ("Size of cache: %d bytes, read %d bytes", 
		   sizeof(fEdep), read));
}

//____________________________________________________________________
//
// EOF
//
Commit	Line	Data
4347b38f	1	/**************************************************************************
4347b38f	2	* Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved. *
66d2ede1	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
4347b38f	15	/* $Id$ */
c2fc1258	16	/** @file AliFMDDigitizer.cxx
	17	@author Christian Holm Christensen <cholm@nbi.dk>
	18	@date Mon Mar 27 12:38:26 2006
	19	@brief FMD Digitizers implementation
02a27b50	20	@ingroup FMD_sim
c2fc1258	21	*/
4347b38f	22	//////////////////////////////////////////////////////////////////////////////
	23	//
	24	// This class contains the procedures simulation ADC signal for the
ef8e8623	25	// Forward Multiplicity detector : SDigits->Digits
4347b38f	26	//
	27	// Digits consists of
	28	// - Detector #
	29	// - Ring ID
	30	// - Sector #
	31	// - Strip #
	32	// - ADC count in this channel
	33	//
ef8e8623	34	// Digits consists of
	35	// - Detector #
	36	// - Ring ID
	37	// - Sector #
	38	// - Strip #
	39	// - Total energy deposited in the strip
	40	// - ADC count in this channel
	41	//
4347b38f	42	// As the Digits and SDigits have so much in common, the classes
	43	// AliFMDDigitizer and AliFMDSDigitizer are implemented via a base
	44	// class AliFMDBaseDigitizer.
	45	//
	46	// +---------------------+
	47	// \| AliFMDBaseDigitizer \|
	48	// +---------------------+
	49	// ^
	50	// \|
	51	// +----------+---------+
	52	// \| \|
	53	// +-----------------+ +------------------+
	54	// \| AliFMDDigitizer \| \| AliFMDSDigitizer \|
	55	// +-----------------+ +------------------+
ef8e8623	56	// \|
	57	// +-------------------+
	58	// \| AliFMDSSDigitizer \|
	59	// +-------------------+
4347b38f	60	//
	61	// These classes has several paramters:
	62	//
	63	// fPedestal
	64	// fPedestalWidth
	65	// (Only AliFMDDigitizer)
	66	// Mean and width of the pedestal. The pedestal is simulated
	67	// by a Guassian, but derived classes my override MakePedestal
	68	// to simulate it differently (or pick it up from a database).
	69	//
	70	// fVA1MipRange
	71	// The dymamic MIP range of the VA1_ALICE pre-amplifier chip
	72	//
	73	// fAltroChannelSize
	74	// The largest number plus one that can be stored in one
	75	// channel in one time step in the ALTRO ADC chip.
	76	//
	77	// fSampleRate
	78	// How many times the ALTRO ADC chip samples the VA1_ALICE
	79	// pre-amplifier signal. The VA1_ALICE chip is read-out at
	80	// 10MHz, while it's possible to drive the ALTRO chip at
	81	// 25MHz. That means, that the ALTRO chip can have time to
	82	// sample each VA1_ALICE signal up to 2 times. Although it's
	83	// not certain this feature will be used in the production,
	84	// we'd like have the option, and so it should be reflected in
	85	// the code.
	86	//
4347b38f	87	//
e802be3e	88	// The shaping function of the VA1_ALICE is generally given by
4347b38f	89	//
e802be3e	90	// f(x) = A(1 - exp(-Bx))
4347b38f	91	//
e802be3e	92	// where A is the total charge collected in the pre-amp., and B is a
	93	// paramter that depends on the shaping time of the VA1_ALICE circut.
	94	//
	95	// When simulating the shaping function of the VA1_ALICe
	96	// pre-amp. chip, we have to take into account, that the shaping
	97	// function depends on the previous value of read from the pre-amp.
	98	//
	99	// That results in the following algorithm:
	100	//
	101	// last = 0;
	102	// FOR charge IN pre-amp. charge train DO
	103	// IF last < charge THEN
	104	// f(t) = (charge - last) * (1 - exp(-B * t)) + last
	105	// ELSE
	106	// f(t) = (last - charge) * exp(-B * t) + charge)
	107	// ENDIF
	108	// FOR i IN # samples DO
	109	// adc_i = f(i / (# samples))
	110	// DONE
	111	// last = charge
	112	// DONE
	113	//
	114	// Here,
	115	//
	116	// pre-amp. charge train
	117	// is a series of 128 charges read from the VA1_ALICE chip
	118	//
	119	// # samples
	120	// is the number of times the ALTRO ADC samples each of the 128
	121	// charges from the pre-amp.
4347b38f	122	//
	123	// Where Q is the total charge collected by the VA1_ALICE
	124	// pre-amplifier. Q is then given by
	125	//
	126	// E S
	127	// Q = - -
	128	// e R
	129	//
	130	// where E is the total energy deposited in a silicon strip, R is the
	131	// dynamic range of the VA1_ALICE pre-amp (fVA1MipRange), e is the
	132	// energy deposited by a single MIP, and S ALTRO channel size in each
	133	// time step (fAltroChannelSize).
	134	//
	135	// The energy deposited per MIP is given by
	136	//
	137	// e = M * rho * w
	138	//
	139	// where M is the universal number 1.664, rho is the density of
	140	// silicon, and w is the depth of the silicon sensor.
	141	//
	142	// The final ADC count is given by
	143	//
	144	// C' = C + P
	145	//
	146	// where P is the (randomized) pedestal (see MakePedestal)
	147	//
	148	// This class uses the class template AliFMDMap<Type> to make an
	149	// internal cache of the energy deposted of the hits. The class
	150	// template is instantasized as
	151	//
	152	// typedef AliFMDMap<std::pair<Float_t, UShort_t> > AliFMDEdepMap;
	153	//
	154	// The first member of the values is the summed energy deposition in a
	155	// given strip, while the second member of the values is the number of
	156	// hits in a given strip. Using the second member, it's possible to
	157	// do some checks on just how many times a strip got hit, and what
	158	// kind of error we get in our reconstructed hits. Note, that this
	159	// information is currently not written to the digits tree. I think a
	160	// QA (Quality Assurance) digit tree is better suited for that task.
	161	// However, the information is there to be used in the future.
	162	//
	163	//
	164	// Latest changes by Christian Holm Christensen
	165	//
	166	//////////////////////////////////////////////////////////////////////////////
	167
e802be3e	168	// /1
	169	// \| A(-1 + B + exp(-B))
	170	// \| f(x) dx = ------------------- = 1
	171	// \| B
	172	// / 0
	173	//
	174	// and B is the a parameter defined by the shaping time (fShapingTime).
	175	//
	176	// Solving the above equation, for A gives
	177	//
	178	// B
	179	// A = ----------------
	180	// -1 + B + exp(-B)
	181	//
	182	// So, if we define the function g: [0,1] -> [0:1] by
	183	//
	184	// / v
	185	// \| Bu + exp(-Bu) - Bv - exp(-Bv)
	186	// g(u,v) = \| f(x) dx = -A -----------------------------
	187	// \| B
	188	// / u
	189	//
	190	// we can evaluate the ALTRO sample of the VA1_ALICE pre-amp between
	191	// any two times (u, v), by
	192	//
	193	//
	194	// B Bu + exp(-Bu) - Bv - exp(-Bv)
	195	// C = Q g(u,v) = - Q ---------------- -----------------------------
	196	// -1 + B + exp(-B) B
	197	//
	198	// Bu + exp(-Bu) - Bv - exp(-Bv)
	199	// = - Q -----------------------------
	200	// -1 + B + exp(-B)
	201	//
	202
56b1929b	203	#include <TTree.h> // ROOT_TTree
ef8e8623	204	#include <TFile.h>
	205	#include "AliFMDDebug.h" // Better debug macros
	206	#include "AliFMDDigitizer.h" // ALIFMDSSDIGITIZER_H
e802be3e	207	#include "AliFMD.h" // ALIFMD_H
ef8e8623	208	#include "AliFMDSDigit.h" // ALIFMDDIGIT_H
e802be3e	209	#include "AliFMDDigit.h" // ALIFMDDIGIT_H
8f6ee336	210	#include "AliFMDParameters.h" // ALIFMDPARAMETERS_H
56b1929b	211	#include <AliRunDigitizer.h> // ALIRUNDIGITIZER_H
	212	#include <AliRun.h> // ALIRUN_H
	213	#include <AliLoader.h> // ALILOADER_H
	214	#include <AliRunLoader.h> // ALIRUNLOADER_H
4347b38f	215
4347b38f	216	//====================================================================
925e6570	217	ClassImp(AliFMDDigitizer)
ef8e8623	218	#if 0
	219	;
	220	#endif
66d2ede1	221
4347b38f	222	//____________________________________________________________________
ef8e8623	223	Bool_t
ef8e8623	224	AliFMDDigitizer::Init()
4347b38f	225	{
ef8e8623	226	// Initialisation
ef8e8623	227	if (!AliFMDBaseDigitizer::Init()) return kFALSE;
42f1b2f5	228
ef8e8623	229	#if 0
	230	// Get the AliRun object
	231	AliRun* run = fRunLoader->GetAliRun();
	232	if (!run) {
	233	AliWarning("Loading gAlice");
	234	fRunLoader->LoadgAlice();
	235	if (!run) {
	236	AliError("Can not get Run from Run Loader");
	237	return kFALSE;
	238	}
42f1b2f5	239	}
66d2ede1	240
ef8e8623	241	// Get the AliFMD object
	242	fFMD = static_cast<AliFMD*>(run->GetDetector("FMD"));
	243	if (!fFMD) {
	244	AliError("Can not get FMD from gAlice");
	245	return kFALSE;
	246	}
	247	#endif
	248	return kTRUE;
4347b38f	249	}
3d44ce66	250
88cb7938	251
4347b38f	252	//____________________________________________________________________
4347b38f	253	void
ef8e8623	254	AliFMDDigitizer::Exec(Option_t*)
4347b38f	255	{
ef8e8623	256	if (!fManager) {
	257	AliError("No digitisation manager defined");
	258	return;
	259	}
	260
	261	// Clear array of deposited energies
	262	fEdep.Reset();
	263
	264	AliRunLoader* runLoader = 0;
	265	if (!gAlice) {
	266	TString folderName(fManager->GetInputFolderName(0));
	267	runLoader = AliRunLoader::GetRunLoader(folderName.Data());
	268	if (!runLoader) {
	269	AliError(Form("Failed at getting run loader from %s",
	270	folderName.Data()));
	271	return;
	272	}
faf80567	273	if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
ef8e8623	274	runLoader->GetAliRun();
	275	}
	276	if (!gAlice) {
	277	AliError("Can not get Run from Run Loader");
	278	return;
	279	}
	280
	281	// Get the AliFMD object
	282	fFMD = static_cast<AliFMD*>(gAlice->GetDetector("FMD"));
	283	if (!fFMD) {
	284	AliError("Can not get FMD from gAlice");
	285	return;
	286	}
	287
	288
	289	// Loop over input files
	290	Int_t nFiles= fManager->GetNinputs();
	291	AliFMDDebug(1, (" Digitizing event number %d, got %d inputs",
	292	fManager->GetOutputEventNr(), nFiles));
	293	for (Int_t inputFile = 0; inputFile < nFiles; inputFile++) {
	294	AliFMDDebug(5, ("Now reading input # %d", inputFile));
	295	// Get the current loader
	296	AliRunLoader* currentLoader =
	297	AliRunLoader::GetRunLoader(fManager->GetInputFolderName(inputFile));
	298	if (!currentLoader) {
	299	Error("Exec", Form("no run loader for input file # %d", inputFile));
	300	continue;
	301	}
	302
	303	// Cache contriutions
	304	AliFMDDebug(5, ("Now summing the contributions from input # %d",inputFile));
	305
	306	// Get the FMD loader
	307	AliLoader* inFMD = currentLoader->GetLoader("FMDLoader");
	308	// And load the summable digits
	309	inFMD->LoadSDigits("READ");
	310
	311	// Get the tree of summable digits
	312	TTree* sdigitsTree = inFMD->TreeS();
	313	if (!sdigitsTree) {
	314	AliError("No sdigit tree from manager");
	315	continue;
	316	}
	317	if (AliLog::GetDebugLevel("FMD","") >= 10) {
	318	TFile* file = sdigitsTree->GetCurrentFile();
	319	if (!file) {
	320	AliWarning("Input tree has no file!");
	321	}
	322	else {
	323	AliFMDDebug(10, ("Input tree file %s content:", file->GetName()));
	324	file->ls();
	325	}
	326	// AliFMDDebug(5, ("Input tree %s file structure:",
	327	// sdigitsTree->GetName()));
	328	// sdigitsTree->Print();
	329	}
	330
	331	// Get the FMD branch
	332	TBranch* sdigitsBranch = sdigitsTree->GetBranch("FMD");
	333	if (!sdigitsBranch) {
	334	AliError("Failed to get sdigit branch");
	335	return;
	336	}
	337
338	// Set the branch addresses
339	fFMD->SetTreeAddress();
340
341	// Sum contributions from the sdigits
faf80567	342	AliFMDDebug(3, ("Will now sum contributions from SDigits"));
ef8e8623	343	SumContributions(sdigitsBranch);
	344
	345	// Unload the sdigits
	346	inFMD->UnloadSDigits();
	347	}
	348
	349	TString outFolder(fManager->GetOutputFolderName());
	350	AliRunLoader* out = AliRunLoader::GetRunLoader(outFolder.Data());
	351	AliLoader* outFMD = out->GetLoader("FMDLoader");
	352	if (!outFMD) {
	353	AliError("Cannot get the FMDLoader output folder");
	354	return;
	355	}
	356	TTree* outTree = MakeOutputTree(outFMD);
	357	if (!outTree) {
	358	AliError("Failed to get output tree");
	359	return;
	360	}
	361	// Set the branch address
	362	fFMD->SetTreeAddress();
	363
	364	// And digitize the cached data
	365	DigitizeHits();
	366
	367	// Fill the tree
	368	Int_t write = outTree->Fill();
83ad576a	369	AliFMDDebug(5, ("Wrote %d bytes to digit tree", write));
ef8e8623	370
	371	// Store the digits
	372	StoreDigits(outFMD);
4347b38f	373	}
3d44ce66	374
4347b38f	375	//____________________________________________________________________
4347b38f	376	void
ef8e8623	377	AliFMDDigitizer::SumContributions(TBranch* sdigitsBranch)
4347b38f	378	{
ef8e8623	379	// Sum energy deposited contributions from each sdigits in a cache
ef8e8623	380	// (fEdep).
83ad576a	381	AliFMDDebug(3, ("Runnin our version of SumContributions"));
ef8e8623	382
	383	// Get a list of hits from the FMD manager
	384	TClonesArray *fmdSDigits = fFMD->SDigits();
	385
	386	// Get number of entries in the tree
	387	Int_t nevents = Int_t(sdigitsBranch->GetEntries());
4347b38f	388
ef8e8623	389	Int_t read = 0;
	390	// Loop over the events in the
	391	for (Int_t event = 0; event < nevents; event++) {
	392	// Read in entry number `event'
	393	read += sdigitsBranch->GetEntry(event);
	394
	395	// Get the number of sdigits
	396	Int_t nsdigits = fmdSDigits->GetEntries ();
83ad576a	397	AliFMDDebug(3, ("Got %5d SDigits", nsdigits));
ef8e8623	398	for (Int_t sdigit = 0; sdigit < nsdigits; sdigit++) {
	399	// Get the sdigit number `sdigit'
	400	AliFMDSDigit* fmdSDigit =
	401	static_cast<AliFMDSDigit*>(fmdSDigits->UncheckedAt(sdigit));
faf80567	402
	403	AliFMDDebug(5, ("Adding contribution of %d tracks",
	404	fmdSDigit->GetNTrack()));
	405	AliFMDDebug(15, ("Contrib from FMD%d%c[%2d,%3d] (%s) from track %d",
	406	fmdSDigit->Detector(),
	407	fmdSDigit->Ring(),
	408	fmdSDigit->Sector(),
	409	fmdSDigit->Strip(),
	410	fmdSDigit->GetName(),
	411	fmdSDigit->GetTrack(0)));
ef8e8623	412
	413	// Extract parameters
	414	AddContribution(fmdSDigit->Detector(),
	415	fmdSDigit->Ring(),
	416	fmdSDigit->Sector(),
	417	fmdSDigit->Strip(),
83ad576a	418	fmdSDigit->Edep(),
b2e6f0b0	419	kTRUE,
faf80567	420	fmdSDigit->GetNTrack(),
faf80567	421	fmdSDigit->GetTracks());
ef8e8623	422	} // sdigit loop
	423	} // event loop
	424
	425
	426	AliFMDDebug(3, ("Size of cache: %d bytes, read %d bytes",
	427	sizeof(fEdep), read));
4347b38f	428	}
66d2ede1	429
4347b38f	430	//____________________________________________________________________
	431	//
	432	// EOF
	433	//
88cb7938	434
	435
	436
66d2ede1	437