//-*- Mode: C++ -*-
-// @(#) $Id$
+// $Id$
#ifndef ALIHLTSYSTEM_H
#define ALIHLTSYSTEM_H
//* ALICE Experiment at CERN, All rights reserved. *
//* See cxx source for full Copyright notice *
-/** @file AliHLTSystem.h
- @author Matthias Richter
- @date
- @brief Global HLT module management and AliRoot integration.
- @note The class is used in Offline (AliRoot) context
-*/
+// @file AliHLTSystem.h
+// @author Matthias Richter
+// @date 2007
+// @brief Global HLT module management and AliRoot integration.
+// @note The class is used in Offline (AliRoot) context
+//
/**
* @defgroup alihlt_system HLT integration into AliRoot
* - AliRoot simulation (AliSimulation)
* - AliRoot reconstruction (AliReconstruction)
*
- * The foundation of the off-line applications is a HLT chain described
- * by the means of AliHLTConfiguration. Special components exist, which
- * emulate the behavoir of the components of the HLT on-line data
+ * In either case an HLT chain described by means of AliHLTConfiguration
+ * builds the core of any HLT application. Special components exist, which
+ * emulate the behavior of the components of the HLT on-line data
* transportation framework. Together with the analysis components, this
* allows the full emulation of the behavoir of HLT analysis chain off-line.
*
/**
* @class AliHLTSystem
* Main class for the HLT integration into AliRoot.
- * The class handles a list of configurations. Configurations are translated
- * into task lists which can be executed.
- *
* @note This class is only used for the @ref alihlt_system.
*
+ * @section alihltsystem_overview Main functionality
+ * The class implements the main binding functionality to run HLT
+ * embedded in AliRoot:
+ * - creates handlers for HLT components (AliHLTComponentHandler)
+ * and configurations (AliHLTConfigurationHandler).
+ * - implements the creation of a task list from configurations
+ * - runs the tasks of the task list
+ * - implements the interface to AliHLTReconstructor and AliHLTSimulation
+ * - manages the registered module agents (AliHLTModuleAgent)
+ *
+ * @section alihltsystem_functions Main functions
+ * The following list gives the most important functions, see documentation
+ * of functions for details.
+ * - ScanOptions(const char*) initialize the system from arguments
+ * - BuildTaskList(const char*) build task list for a reconstruction chain
+ * - Run() processing loop for task list
+ * - Reconstruct() interface to AliHLTReconstructor
+ * - ProcessHLTOUT() process an HLTOUT colection
+ *
+ * @section alihltsystem_initialization Initialization
+ * AliHLTSystem is initialized with a list of component libraries which determine
+ * the actual functionality. See ScanOptions() for description of options.
+ *
+ * @section alihltsystem_usage Usage
+ * The class AliHLTPluginBase handles the global instance of AliHLTSystem,
+ * the instance is created and fetched like
+ * <pre>
+ * // setup the HLT system
+ * AliHLTSystem* pHLT=AliHLTPluginBase::GetInstance();
+ * </pre>
+ *
* @ingroup alihlt_system
*/
class AliHLTSystem : public AliHLTLogging {
/**
* Build a task list
- * This method is used to build the tasks from the 'master' configuration
- * objects which are added to the HLT system handler. This is an iterative
- * process since the task might depend upon other configurations. For each
- * configuration object which has not yet been converted into a task, the
- * method will be called iteratively. Finally, after building all tasks which
- * the current one depends on have been created, the task is inserted to the
- * list of tasks with the InsertTask method.
+ * This method is used to build the list of tasks from the configuration
+ * id of a single 'master' configuration.
+ *
+ * Configuration entries might depend upon other configurations. For each
+ * configuration which has not yet been converted into an AliHLTTask, the
+ * method will be called iteratively. Finally, after building all tasks
+ * providing the input for the current one, the task is inserted to the
+ * list of tasks with the InsertTask() method.
+ *
+ * The function can be called multiple times in order to add more than one
+ * chain to the system.
+ *
* @param pConf configuration name/id
*/
int BuildTaskList(const char* pConf);
void PrintTaskList();
/**
- * Run the task list.
- * The method checks whether the task list has already been build. If not,
- * or the configuration list has been changed, the @ref BuildTaskList
- * method is called. <br>
+ * Run one or more events.
+ * Core of the processing loop. The method expects the task list to be
+ * already created by a previous call to BuildTaskList(const char*)
+ *
* All tasks of the list will be subsequently processed for each event.
* The system can remain started if the \em bStop parameter is 0. In that
* case the system just waits for the next event. A specific call with
/**
* The memory allocation function for components.
- * This function is part of the running environment of the components.
+ * This function is part of the running environment of the components,
+ * see AliHLTAnalysisEnvironment
*/
static void* AllocMemory( void* param, unsigned long size );
/**
* The allocation function for component EventDoneData.
- * This function is part of the running environment of the components.
+ * This function is part of the running environment of the components,
+ * see AliHLTAnalysisEnvironment
*/
static int AllocEventDoneData( void* param, AliHLTEventID_t eventID, unsigned long size, AliHLTComponentEventDoneData** edd );
* either by the AliHLTReconstructor plugin during AliRoot reconstruction
* of raw data, or AliHLTSimulation during simulation of data.
*
- * The two cases are distinguished by the availablility of the run loader
+ * The two cases are distinguished by the availablility of the AliRunLoader
* and raw reader.
- * - AliRoot simulation: run loader is available and is propagated to the
+ * - AliRoot simulation: AliRunLoader is available and is propagated to the
* module agents (AliHLTModuleAgent) to generate the corresponding
* configurations and chains, and to the AliHLTOfflineSource components.
+ * raw reader might be available depending on whether raw data was
+ * simulated or not.
* - AliRoot reconstruction: raw reader is available and is propagated to
- * the agents and AliHLTOfflineSource components.
+ * the agents and AliHLTOfflineSource components. AliRunLoader is always
+ * NULL.
*
* The system remains started after the processing and just waits for the
* next event. A specific call with nofEvents==0 is needed to execute the
* stop sequence.
*
- * The 'runLoader' and 'rawReader' parameters are set to all active
+ * The 'runLoader' and 'rawReader' parameters are propagated to all active
* AliHLTOfflineDataSource's and the HLT chain is processed for the given
* number of events. If the rawReader is NULL, reconstruction is done on
* simulated data, from real data if a RawReader is specified.
+ *
+ * After setting up the system with the reconstruction parameters the
+ * Run() method is called and carries out the processing of the chain.
+ *
* @param nofEvents number of events
- * @param runLoader the AliRoot runloader
+ * @param runLoader the AliRoot RunLoader
* @param rawReader the AliRoot RawReader
* @return number of reconstructed events, neg. error code if failed
*/
* and FillESD method of the AliRoot reconstruction.
*
* The method is most likely deprecated as the scheme has been slightly
- * changed. The ESD is filled by the HLTOUT handlers u=implemented by the
+ * changed. The ESD is filled by the HLTOUT handlers implemented by the
* HLT modules rather than by components within the reconstruction chain.
* Still, HLT reconstruction chains can be run during the AliRoot
* reconstruction, data produced by such chains is automatically added
* reconstruction interface. The HLT module must implement HLTOUT handlers
* and provide those through the module agent.
*
- * This method is called on event basis, and thus must copy the previously
- * reconstructed data of the event from the 'ESD' recorder. The FillESD
- * method of all active AliHLTOfflineDataSink's is called.
* @param eventNo current event no (Note: this event number is just a
* processing counter and is not related to the nature/
* origin of the event
/**
* Process the HLTOUT data.
+ * The provided instance of AliHLTOUT provides the access to the data.
+ * AliHLTSystem queries all registered module agents (AliHLTModuleAgent)
+ * for the ability to treat a specific data block. As the last step the
+ * ESD object is filled. Please note that the provided ESD is the hltEsd
+ * in case of AliReconstructor (switched in AliReconstruction).
*/
int ProcessHLTOUT(AliHLTOUT* pHLTOUT, AliESDEvent* esd);
/**
* Process all kChain-type data blocks of the HLTOUT data.
- * The function is involed from ProcessHLTOUT as the first step in
- * the processing.
+ * Handlers of type AliHLTModuleAgent::kChain are executed as the first
+ * step of the processing. The function is invoked from ProcessHLTOUT(),
+ * eventual output of the chain is added to the HLTOUT collection.
*/
int ProcessHLTOUTkChain(AliHLTOUT* pHLTOUT);
/**
* Prepare the HLT system for running.
* - module agents are requested to register configurations
- * - task lists are built from the top configurations of the modules
+ * - task lists are built from the reconstruction chains of the modules
*
* @param rawReader instance of the raw reader or NULL
- * @param runloader optional instance of the run loader
+ * @param runloader optional instance of the AliRunLoader
* @return neg. error code if failed <br>
* -EBUSY system is in kRunning state <br>
*/
/**
* Old method kept for backward compatibilty.
*
- * @param runloader optional instance of the run loader
+ * @param runloader optional instance of the AliRunLoader
* @return neg. error code if failed <br>
* -EBUSY system is in kRunning state <br>
*/
/**
* Scan options and load component libraries.
* The options consist of blank separated tokens. Libraries can be just
- * specified by their name. Further options
+ * specified by their name, and can be excluded by adding a '!'-mark in
+ * front. <br>
+ * Further options
* <!-- NOTE: ignore the \li. <i> and </i>: it's just doxygen formatting -->
* \li loglevel=<i>level</i> <br>
* logging level for this processing
* Load the configurations specified by the module agents.
* The runLoader is passed to the agent and allows configuration
* selection.
+ * - AliSimulation: runloader valid, raw reader might be valid
+ * - AliReconstruction: runloader always NULL, raw reader valid
+ *
* @param rawReader instance of the raw reader or NULL
- * @param runloader optional instance of the run loader
+ * @param runloader optional instance of the AliRunLoader
* @return neg. error code if failed
*/
int LoadConfigurations(AliRawReader* rawReader, AliRunLoader* runloader=NULL);
/**
- * Get the top configurations of all agents and build the task lists.
+ * Get the reconstruction chains from all agents and build the task lists.
+ * AliHLTModuleAgent implementations can define reconstruction chains
+ * depending on the availibility of AliRunLoader and AliRawReader parameters.
+ *
* @param rawReader instance of the raw reader or NULL
- * @param runloader optional instance of the run loader
+ * @param runloader optional instance of the AliRunLoader
* @return neg. error code if failed
*/
int BuildTaskListsFromReconstructionChains(AliRawReader* rawReader,
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff