3 #ifndef ALIHLTDATABUFFER_H
4 #define ALIHLTDATABUFFER_H
5 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
6 * See cxx source for full Copyright notice */
8 /** @file AliHLTDataBuffer.h
9 @author Matthias Richter
11 @brief Handling of Data Buffers for HLT components.
12 @note The class is used in Offline (AliRoot) context
15 // see below for class documentation
17 // refer to README to build package
19 // visit http://web.ift.uib.no/~kjeks/doc/alice-hlt
23 #include "AliHLTLogging.h"
24 #include "AliHLTDataTypes.h"
25 #include "AliHLTComponent.h"
27 class AliHLTConsumerDescriptor;
30 /** list of AliHLTConsumerDescriptor pointers */
31 typedef vector<AliHLTConsumerDescriptor*> AliHLTConsumerDescriptorPList;
33 typedef AliHLTUInt8_t* AliHLTUInt8Pointer_t;
36 * @class AliHLTDataBuffer
37 * @brief Handling of data buffers for the HLT.
39 * The class provides handling of data buffers for HLT tasks. Each task gets
40 * its own Data Buffer instance. The buffer is grouped into different data
41 * segments according to the output of the component.<br>
42 * The Data Buffer keeps control over the data requests of the 'child'
43 * components. Each component can subscribe to a certain segment of the data
44 * buffer. It's state is then changed from 'reserved' to 'active'. After the
45 * data processing, the component has to release the segment and it's state is
46 * set to 'processed'. If all components have requested and released their data,
47 * the Raw Buffer is released and pushed back in the list of available buffers.
49 * @note This class is only used for the @ref alihlt_system.
51 * @ingroup alihlt_system
53 class AliHLTDataBuffer : public TObject, public AliHLTLogging
56 //////////////////////////////////////////////////////////////////////////////
57 // constructors and destructors
59 /* standard constructor
63 virtual ~AliHLTDataBuffer();
65 //////////////////////////////////////////////////////////////////////////////
69 * Add component to the list of consumers
70 * @param pConsumer - a consumer of type AliHLTComponent
72 int SetConsumer(AliHLTComponent* pConsumer);
74 //////////////////////////////////////////////////////////////////////////////
75 // component to component communication
78 * Determine the number of matching data blocks for the component and a
79 * consumer component. <br>
80 * The first approach will support only one output data type for processing
82 * @param pConsumer the component which subscribes to the buffer
83 * @param tgtList (optional) the list to receive the data types
84 * @return: number of data blocks which match the input data types
85 * of the consumer, neg. error code if failed <br>
86 * -EINVAL invalid parameter <br>
88 int FindMatchingDataBlocks(const AliHLTComponent* pConsumer,
89 AliHLTComponentDataTypeList* tgtList=NULL);
92 * Subscribe to a segment of the data buffer.
93 * The function prepares the block descriptor for subsequent use with the
94 * AliHLTComponent::ProcessEvent method, the method can prepare several block
95 * descriptors up to the array size specified by iArraySize. The return value
96 * is independent from the array size the number of block descriptors which
97 * would have been prepared if there was enough space in the array<br>
98 * The method is used by the consumer component.
99 * @param pConsumer the component which subscribes to the buffer
100 * @param arrayBlockDesc pointer to block descriptor to be filled
101 * @param iArraySize size of the block descriptor array
102 * @return: number of matching data blocks, neg. error code if failed<br>
103 * -EACCESS the consumer state can't be changed (activated)
104 * -EBADF unresolved data segments <br>
105 * -ENOENT consumer component not found <br>
106 * -ENODATA data buffer does not have raw data <br>
107 * -EINVAL invalid parameter <br>
109 int Subscribe(const AliHLTComponent* pConsumer,
110 AliHLTComponentBlockDataList& blockDescList);
113 * Release an instance of the data buffer.
114 * Resets the variables of the block descriptor.
115 * If all buffer segments are released, the Data Buffer is reseted
116 * and the Raw Buffer released.<br>
117 * The method is used by the consumer component.
118 * @param pBlockDesc descriptor of the data segment
119 * @param pConsumer the component which subscribes to the buffer
120 * @param pOwnerTask task owning this buffer
121 * @return: >0 if success, negative error code if failed <br>
122 * -EACCESS the consumer state can not be changed (de-activated)
123 * -ENOENT consumer has not subscribed to the buffer <br>
124 * -EINVAL invalid parameter <br>
126 int Release(AliHLTComponentBlockData* pBlockDesc, const AliHLTComponent* pConsumer,
127 const AliHLTTask* pOwnerTask);
130 * Register an input data block for forwarding.
131 * Consumer of this data buffer subscribe to forwarded data blocks in te same way.
132 * Forwarded data blocks are released when the last consumer has released the
134 * @param pSrcTask original source task of the data block
135 * @param pBlockDesc descriptor of the data segment
137 int Forward(AliHLTTask* pSrcTask, AliHLTComponentBlockData* pBlockDesc);
140 * Get a target buffer of minimum size iMinSize.
141 * The method is used by the component which owns the Data Buffer to
142 * allocate a buffer for the data it is going to produce.
143 * @param iMinSize minumum size of the requested buffer
144 * @return: pointer to target buffer if
146 AliHLTUInt8_t* GetTargetBuffer(int iMinSize);
149 * Set the segments for the data buffer.
150 * This is usually done after the component has written the data to the buffer,
151 * which was requested by the @ref GetTargetBuffer method. The component might
152 * produce different types of data, for each type a segment has to be defined
153 * which describes the data inside the buffer.<br>
154 * The @ref AliHLTComponentBlockData segment descriptor comes directly from
155 * the @ref AliHLTComponent::ProcessEvent method.
156 * @param pTgt the target buffer which the segments refer to
157 * @param arraySegments the output block descriptors of the component
158 * @param iSize size of the array
160 int SetSegments(AliHLTUInt8_t* pTgt, AliHLTComponentBlockData* arraySegments, int iSize);
163 * Check if the data buffer is empty.
164 * @return 1 if empty, 0 if not
169 * Get the total and maximum size of the buffer.
170 * Lets see if this is needed later
172 //int GetTotalSize();
175 * Get the number of segments
176 * @return number of segments
178 int GetNofSegments();
181 * Get the total number of consumers.
182 * This gives the number of consumers regardless of their state.
183 * @return number of consumers
185 int GetNofConsumers();
188 * Get the number of consumers which still need to be processed during
190 * @return number of consumers
192 int GetNofPendingConsumers();
195 * Get the number of consumers currently under processing.
196 * @return number of active consumers
198 int GetNofActiveConsumers();
201 * Check if a consumer is already in the list
202 * @param pConsumer pointer to consumer component
203 * @param bAllLists search in all lists if 1
204 * search only in fConsumer list if 0
205 * @return 1 if found, 0 if not
207 int FindConsumer(AliHLTComponent* pConsumer, int bAllLists=1);
210 * Public method to reset the buffer.
211 * Eventually with some additional checks. In normal operation,
212 * an external reset should not be necessary.
217 * Set local logging level
218 * logging filter for individual object
220 void SetLocalLoggingLevel(AliHLTComponentLogSeverity level)
221 {fgLogging.SetLocalLoggingLevel(level); AliHLTLogging::SetLocalLoggingLevel(level);}
224 * @class AliHLTDataSegment
225 * @brief Descriptor of a data segment within the buffer.
227 class AliHLTDataSegment {
228 friend class AliHLTDataBuffer;
229 friend class AliHLTConsumerDescriptor;
233 fDataType(kAliHLTVoidDataType),
241 AliHLTDataSegment(AliHLTUInt8_t* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size)
243 fDataType(kAliHLTVoidDataType),
245 fSegmentOffset(offset),
251 AliHLTDataSegment(void* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size)
253 fDataType(kAliHLTVoidDataType),
254 fPtr((AliHLTUInt8_t*)ptr),
255 fSegmentOffset(offset),
261 AliHLTDataSegment(void* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size, AliHLTComponentDataType dt, AliHLTUInt32_t spec)
264 fPtr((AliHLTUInt8_t*)ptr),
265 fSegmentOffset(offset),
271 AliHLTUInt8_t* GetPtr() const {return (AliHLTUInt8_t*)*this;}
273 AliHLTUInt32_t GetSize() const {return fSegmentSize;}
275 int operator==(const AliHLTDataSegment& seg) const
277 return (fPtr+fSegmentOffset==seg.fPtr+seg.fSegmentOffset) && (fSegmentSize==seg.fSegmentSize);
279 operator AliHLTUInt8_t*() const {return fPtr+fSegmentOffset;}
282 /** the data type of this segment */
283 AliHLTComponentDataType fDataType; // see above
284 /** pointer to the buffer */
285 AliHLTUInt8Pointer_t fPtr; //!transient
286 /** offset in byte within the data buffer */
287 AliHLTUInt32_t fSegmentOffset; // see above
288 /** size of the actual content */
289 AliHLTUInt32_t fSegmentSize; // see above
290 /** data specification */
291 AliHLTUInt32_t fSpecification; // see above
295 * @class AliHLTRawBuffer
296 * @brief Descriptor of the raw data buffer which can host several segments.
298 class AliHLTRawBuffer {
300 /** standard constructor */
301 AliHLTRawBuffer() : fSize(0), fTotalSize(0), fPtr(NULL) {}
303 AliHLTRawBuffer(AliHLTUInt32_t size);
305 virtual ~AliHLTRawBuffer();
308 * Use a fraction of the buffer.
309 * @param size size in bytes to be used
310 * @return pointer to buffer
312 AliHLTUInt8_t* UseBuffer(AliHLTUInt32_t size);
315 * Check whether buffer fits for a request.
316 * @param size size of the request in bytes
317 * @return 1 if buffer is big enough, 0 if not
319 int CheckSize(AliHLTUInt32_t size) const;
322 * Get used size of the buffer
324 AliHLTUInt32_t GetUsedSize() const {return fSize;}
327 * Get total size of the buffer
329 AliHLTUInt32_t GetTotalSize() const {return fTotalSize;}
332 * Get pointer of data buffer
334 AliHLTUInt8_t* GetPointer() const {return fPtr;}
337 * Write check pattern
339 int WritePattern(const char* pattern, int size);
344 int CheckPattern(const char* pattern, int size) const;
348 * Data buffer remains allocated, used size set to 0
352 int operator==(void*) const;
353 int operator==(AliHLTUInt8_t* ptr) const {return fPtr==ptr;}
354 int operator<=(void*) const;
355 int operator>(void*) const;
356 int operator-(void*) const;
358 operator void*() const {return fPtr;}
359 operator AliHLTUInt8_t*() const {return fPtr;}
362 /** copy constructor prohibited */
363 AliHLTRawBuffer(const AliHLTRawBuffer&);
364 /** assignment operator prohibited */
365 AliHLTRawBuffer& operator=(const AliHLTRawBuffer&);
367 /** size of the currently occupied partition of the buffer */
368 AliHLTUInt32_t fSize; // see above
369 /** total size of the buffer, including safety margin */
370 AliHLTUInt32_t fTotalSize; // see above
372 AliHLTUInt8_t* fPtr; //! transient
376 /** copy constructor prohibited */
377 AliHLTDataBuffer(const AliHLTDataBuffer&);
378 /** assignment operator prohibited */
379 AliHLTDataBuffer& operator=(const AliHLTDataBuffer&);
381 /* lets see if this is needed
382 AliHLTDataSegment* FindDataSegment(AliHLTComponentDataType datatype);
386 * Find those data segments which match the input types of a component.
387 * @param pConsumer the component which subscribes to the buffer
388 * @param tgtList the list to receive the data segment descriptors
389 * @return: number of data blocks which match the input data types
390 * of the consumer, neg. error code if failed <br>
391 * -EINVAL invalid parameter <br>
393 int FindMatchingDataSegments(const AliHLTComponent* pConsumer,
394 vector<AliHLTDataBuffer::AliHLTDataSegment>& tgtList);
397 * Reset the data buffer.
398 * Removes all consumers back to the @ref fConsumers list, deletes
399 * segments and releases the Raw Buffer.
401 int ResetDataBuffer();
403 //////////////////////////////////////////////////////////////////////////////
405 // the data description
407 // the data segments within this buffer
408 vector<AliHLTDataSegment> fSegments; // see above
410 // the list of all consumers which are going to subscribe to the buffer
411 AliHLTConsumerDescriptorPList fConsumers; // see above
412 // the list of all consumers which are currently subscribed to the buffer
413 AliHLTConsumerDescriptorPList fActiveConsumers; // see above
414 // the list of all consumers which are already released for the current event
415 AliHLTConsumerDescriptorPList fReleasedConsumers; // see above
417 // the buffer instance
418 AliHLTRawBuffer* fpBuffer; //! transient
420 // flags indicating the state of the buffer
421 AliHLTUInt32_t fFlags; // see above
423 /** list of tasks with forwarded data blocks */
424 vector<AliHLTTask*> fForwardedSegmentSources; //! transient
426 /** list of forwarded block descriptors */
427 vector<AliHLTDataSegment> fForwardedSegments; //! transient
429 //////////////////////////////////////////////////////////////////////////////
430 // global buffer handling, internal use only
433 * Create a raw buffer of a certain size.
434 * The function tries to find a buffer of the given size (or a bit bigger by a
435 * certain margin @ref fgMargin) from the list of free buffers.
436 * If no buffer is available, a new one is created and added to the buffer handling.
437 * @param size min. size of the requested buffer
438 * @return pointer to raw buffer
440 static AliHLTRawBuffer* CreateRawBuffer(AliHLTUInt32_t size);
443 * Mark a buffer as free.
444 * After the Data Buffer has finnished using the raw buffer, it is released
445 * and added to the list of available buffers.
446 * @param pBuffer the raw buffer to release
447 * @return >=0 if succeeded, neg. error code if failed
449 static int ReleaseRawBuffer(AliHLTRawBuffer* pBuffer);
452 * Deletes all the raw buffers.
453 * When the last Data Buffer object is destructed, all raw data buffers are
456 static int DeleteRawBuffers();
459 * Number of instances of AliHLTDataBuffer.
460 * The statice variable is incremented and decremented in the constructor/
461 * destructor. All internal data structures are cleaned up when the last
462 * instance is exiting.
464 static int fgNofInstances; // see above
465 /** global list of free raw buffers */
466 static vector<AliHLTRawBuffer*> fgFreeBuffers; // see above
467 /** global list of currently active raw buffers */
468 static vector<AliHLTRawBuffer*> fgActiveBuffers; // see above
469 /** determines the raw buffer size margin at buffer requests */
470 static AliHLTUInt32_t fgMargin; // see above
472 /** global instance to HLT logging class for static methods */
473 static AliHLTLogging fgLogging; // see above
475 /** size of the safety pattern */
476 static const Int_t fgkSafetyPatternSize; // see above
478 /** the safety pattern */
479 static const char fgkSafetyPattern[]; //!transient
481 //////////////////////////////////////////////////////////////////////////////
482 // internal helper functions
485 * Find the consumer descriptor for a certain component and data type in
486 * a list of consumers.<br>
487 * <b>Note:</b> There are three lists which contain the consumers in the
489 * @param pConsumer pointer to consumer component
490 * @param list list where to search for the consumer
492 AliHLTConsumerDescriptor* FindConsumer(const AliHLTComponent* pConsumer,
493 AliHLTConsumerDescriptorPList &list) const;
496 * Change the state of a consumer.
497 * The state of a consumer is determined by the list it is strored in, the
498 * method moves a consumer from the source to the target list.
499 * @param pDesc pointer to consumer descriptor
500 * @param srcList list where the consumer is currently to be found
501 * @param tgtList list where to move the consumer
503 int ChangeConsumerState(AliHLTConsumerDescriptor* pDesc,
504 AliHLTConsumerDescriptorPList &srcList,
505 AliHLTConsumerDescriptorPList &tgtList);
508 * Cleanup a consumer list.
509 * Release all allocated data structures. <b>Note:</b> Not the component itself!
511 int CleanupConsumerList();
513 ClassDef(AliHLTDataBuffer, 0)
516 #endif // ALIHLTDATABUFFER_H