5 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
6 * See cxx source for full Copyright notice */
8 /** @file AliHLTSystem.h
9 @author Matthias Richter
11 @brief Global HLT module management and AliRoot integration.
12 @note The class is used in Offline (AliRoot) context
16 * @defgroup alihlt_system HLT integration into AliRoot
17 * This section describes the HLT integration into AliRoot.
20 #include "AliHLTLogging.h"
23 class AliHLTComponentHandler;
24 class AliHLTConfiguration;
25 class AliHLTConfigurationHandler;
33 * Main class for the HLT integration into AliRoot.
34 * The class handles a list of configurations. Configurations are translated
35 * into task lists which can be executed.
37 * @note This class is only used for the @ref alihlt_system.
39 * @ingroup alihlt_system
41 class AliHLTSystem : public AliHLTLogging {
43 /** default constructor */
45 /** not a valid copy constructor, defined according to effective C++ style */
46 AliHLTSystem(const AliHLTSystem&);
47 /** not a valid assignment op, but defined according to effective C++ style */
48 AliHLTSystem& operator=(const AliHLTSystem&);
50 virtual ~AliHLTSystem();
53 * Pointer to an instance of @ref AliHLTComponentHandler.
55 AliHLTComponentHandler* fpComponentHandler; //! transient
58 * Pointer to an instance of @ref AliHLTConfigurationHandler.
60 AliHLTConfigurationHandler* fpConfigurationHandler; //! transient
63 * Add a configuration to the end of the list.
64 * @param pConf pointer to configuration to add
66 int AddConfiguration(AliHLTConfiguration* pConf);
69 * Insert a configuration to the end of the list after the specified
71 * @param pConf pointer to configuration to insert
72 * @param pPrec pointer to configuration to insert the new one after
74 int InsertConfiguration(AliHLTConfiguration* pConf, AliHLTConfiguration* pPrec);
77 * Remove a configuration from the list.
78 * @param pConf pointer to configuration to delete
80 int DeleteConfiguration(AliHLTConfiguration* pConf);
83 * Build a task list from a configuration object.
84 * This method is used to build the tasks from the 'master' configuration
85 * objects which are added to the HLT system handler. This is an iterative
86 * process since the task might depend upon other configurations. For each
87 * configuration object which has not yet been converted into a task, the
88 * method will be called iteratively. Finally, after building all tasks which
89 * the current one depends on have been created, the task is inserted to the
90 * list of tasks with the InsertTask method.
91 * @param pConf pointer to configuration to build the task list from
93 int BuildTaskList(AliHLTConfiguration* pConf);
96 * Clean the list of tasks and delete all the task objects.
101 * Insert a task to the task list.
102 * The method first checks whether all dependencies are resolved (i.e. exist
103 * already in the task list). During this iteration the cross links between
104 * the tasks are set as well. If all dependencies are resolved, the task is
105 * added at the end of the list.
106 * @param pTask pointer to task to add
108 int InsertTask(AliHLTTask* pTask);
111 * Find a task with an id.
112 * @param id CONFIGURATION id (not a COMPONENT id!)
114 AliHLTTask* FindTask(const char* id);
117 * Print the task list.
119 void PrintTaskList();
123 * The method checks whether the task list has already been build. If not,
124 * or the configuration list has been changed, the @ref BuildTaskList
126 * All tasks of the list will be subsequently processed for each event.
127 * @param iNofEvents number of events
128 * @return number of reconstructed events, neg error code if failed
130 int Run(Int_t iNofEvents=1);
133 * Init all tasks from the list.
134 * The @ref AliHLTTask::Init method is called for each task, the components
136 * @return neg error code if failed
142 * The @ref AliHLTTask::StartRun method is called for each task, the
143 * components will be prepared for event processing.
144 * @return neg error code if failed
150 * The @ref AliHLTTask::ProcessTask method is called for each task.
151 * @return neg error code if failed
153 int ProcessTasks(Int_t eventNo);
157 * The @ref AliHLTTask::EndRun method is called for each task, the components
158 * will be cleaned after event processing.
159 * @return neg error code if failed
164 * De-init all tasks from the list.
165 * The @ref AliHLTTask::Deinit method is called for each task, the components
167 * @return neg error code if failed
172 * The memory allocation function for components.
173 * This function is part of the running environment of the components.
175 static void* AllocMemory( void* param, unsigned long size );
178 * Reconstruction inside AliRoot.
179 * To be called by the AliHLTReconstructor plugin during the
180 * LocalReconstruction step of the AliRoot reconstruction. The latter means
181 * that all events are reconstructed at once, the event loop is internally
182 * implemented. In contrast to that, the FillESD method is called event by
183 * event. This requires an 'ESD' recorder at the end of the HLT chain, in
184 * order to have the reconstructed events available for the FillESD loop.
185 * The 'runLoader' and 'rawReader' parameters are set to all active
186 * AliHLTOfflineDataSource's and the HLT chain is processed for the given
187 * number of events. If the rawReader is NULL, reconstruction is done on
188 * simulated data, from real data if a RawReader is specified.
189 * @param nofEvents number of events
190 * @param runLoader the AliRoot runloader
191 * @param rawReader the AliRoot RawReader
192 * @return number of reconstructed events, neg. error code if failed
194 int Reconstruct(int nofEvents, AliRunLoader* runLoader,
195 AliRawReader* rawReader=NULL);
198 * Fill ESD for one event.
199 * To be called by the AliHLTReconstructor plugin during the event loop
200 * and FillESD method of the AliRoot reconstruction.
201 * This method is called on event basis, and thus must copy the previously
202 * reconstructed data of the event from the 'ESD' recorder. The FillESD
203 * method of all active AliHLTOfflineDataSink's is called.
204 * @param eventNo current event no (Note: this event number is just a
205 * processing counter and is not related to the nature/
206 * origin of the event
207 * @param runLoader the AliRoot runloader
208 * @param esd an AliESD instance
209 * @return neg. error code if failed
211 int FillESD(int eventNo, AliRunLoader* runLoader, AliESD* esd);
214 * Load component libraries.
215 * @param libs string of blank separated library names
216 * @return neg. error code if failed
218 int LoadComponentLibraries(const char* libs);
221 * Prepare the HLT system for running.
222 * - module agents are requested to register configurations
223 * - task lists are built from the top configurations of the modules
224 * @return neg. error code if failed <br>
225 * -EBUSY system is in kRunning state <br>
227 int Configure(AliRunLoader* runloader=NULL);
230 * Reset the HLT system.
231 * Reset is not possible while the system is in running state.
232 * @param bForce force the reset
233 * @return neg. error code if failed <br>
234 * -EBUSY system is in kRunning state <br>
236 int Reset(int bForce=0);
239 * Load the configurations specified by the module agents.
240 * The runLoader is passed to the agent and allows configuration
242 * @return neg. error code if failed
244 int LoadConfigurations(AliRunLoader* runloader=NULL);
247 * Get the top configurations of all agents and build the task lists.
248 * @return neg. error code if failed
250 int BuildTaskListsFromTopConfigurations(AliRunLoader* runloader=NULL);
253 kUninitialized = 0x0,
254 kLibrariesLoaded = 0x1,
255 kConfigurationLoaded = 0x2,
256 kTaskListCreated = 0x4,
260 } AliHLTSystemState_t ;
263 * Check status of the system.
264 * @param flag AliHLTSystemState_t value to check for
265 * @return 1 if set, 0 if not
267 int CheckStatus(int flag);
270 * Get the current status.
271 * @return status flags of @ref AliHLTSystemState_t
273 int GetStatusFlags();
281 int SetStatusFlags(int flags);
284 * clear status flags.
286 int ClearStatusFlags(int flags);
288 /* TList fConfList; */
289 /* int fbListChanged; */
292 TList fTaskList; // see above
294 /** the number of instances of AliHLTSystem */
295 static int fgNofInstances; // see above
297 /** state of the object */
298 int fState; // see above
301 ClassDef(AliHLTSystem, 2);