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 blockDescList block descriptor vector to be filled
101 * @return: number of matching data blocks, neg. error code if failed<br>
102 * -EACCESS the consumer state can't be changed (activated)
103 * -EBADF unresolved data segments <br>
104 * -ENOENT consumer component not found <br>
105 * -ENODATA data buffer does not have raw data <br>
106 * -EINVAL invalid parameter <br>
108 int Subscribe(const AliHLTComponent* pConsumer,
109 AliHLTComponentBlockDataList& blockDescList);
112 * Release an instance of the data buffer.
113 * Resets the variables of the block descriptor.
114 * If all buffer segments are released, the Data Buffer is reseted
115 * and the Raw Buffer released.<br>
116 * The method is used by the consumer component.
117 * @param pBlockDesc descriptor of the data segment
118 * @param pConsumer the component which subscribes to the buffer
119 * @param pOwnerTask task owning this buffer
120 * @return: >0 if success, negative error code if failed <br>
121 * -EACCESS the consumer state can not be changed (de-activated)
122 * -ENOENT consumer has not subscribed to the buffer <br>
123 * -EINVAL invalid parameter <br>
125 int Release(AliHLTComponentBlockData* pBlockDesc, const AliHLTComponent* pConsumer,
126 const AliHLTTask* pOwnerTask);
129 * Release a forwarded data block.
131 int ReleaseForwardedBlock(AliHLTComponentBlockData* pBlockDesc,
132 const AliHLTTask* pOwnerTask);
135 * Register an input data block for forwarding.
136 * Consumer of this data buffer subscribe to forwarded data blocks in te same way.
137 * Forwarded data blocks are released when the last consumer has released the
139 * @param pSrcTask original source task of the data block
140 * @param pBlockDesc descriptor of the data segment
142 int Forward(AliHLTTask* pSrcTask, AliHLTComponentBlockData* pBlockDesc);
145 * Get a target buffer of minimum size iMinSize.
146 * The method is used by the component which owns the Data Buffer to
147 * allocate a buffer for the data it is going to produce.
148 * @param iMinSize minumum size of the requested buffer
149 * @return: pointer to target buffer if
151 AliHLTUInt8_t* GetTargetBuffer(int iMinSize);
154 * Set the segments for the data buffer.
155 * This is usually done after the component has written the data to the buffer,
156 * which was requested by the @ref GetTargetBuffer method. The component might
157 * produce different types of data, for each type a segment has to be defined
158 * which describes the data inside the buffer.<br>
159 * The @ref AliHLTComponentBlockData segment descriptor comes directly from
160 * the @ref AliHLTComponent::ProcessEvent method.
161 * @param pTgt the target buffer which the segments refer to
162 * @param arraySegments the output block descriptors of the component
163 * @param iSize size of the array
165 int SetSegments(AliHLTUInt8_t* pTgt, AliHLTComponentBlockData* arraySegments, int iSize);
168 * Check if the data buffer is empty.
169 * @return 1 if empty, 0 if not
174 * Get the total and maximum size of the buffer.
175 * Lets see if this is needed later
177 //int GetTotalSize();
180 * Get the number of segments including the forwarded data blocks.
181 * @return number of segments
183 int GetNofSegments();
186 * Get the total number of consumers.
187 * This gives the number of consumers regardless of their state.
188 * @return number of consumers
190 int GetNofConsumers();
193 * Get the number of consumers which still need to be processed during
195 * @return number of consumers
197 int GetNofPendingConsumers();
200 * Get the number of consumers currently under processing.
201 * @return number of active consumers
203 int GetNofActiveConsumers();
206 * Check if a consumer is already in the list
207 * @param pConsumer pointer to consumer component
208 * @param bAllLists search in all lists if 1
209 * search only in fConsumer list if 0
210 * @return 1 if found, 0 if not
212 int FindConsumer(const AliHLTComponent* pConsumer, int bAllLists=1);
215 * Public method to reset the buffer.
216 * Eventually with some additional checks. In normal operation,
217 * an external reset should not be necessary.
222 * Set local logging level
223 * logging filter for individual object
225 void SetLocalLoggingLevel(AliHLTComponentLogSeverity level)
226 {fgLogging.SetLocalLoggingLevel(level); AliHLTLogging::SetLocalLoggingLevel(level);}
229 * Print summary of the global buffer management.
231 static int PrintStatistics();
234 * Set the global event count.
235 * The event count is deployed to find buffers which have not been used
236 * for a while. In such a case to policy to find an appropriate buffer is
239 static int SetGlobalEventCount(AliHLTUInt32_t eventCount) {fgEventCount=eventCount; return 0;}
242 * @class AliHLTDataSegment
243 * @brief Descriptor of a data segment within the buffer.
245 class AliHLTDataSegment {
246 friend class AliHLTDataBuffer;
247 friend class AliHLTConsumerDescriptor;
251 fDataType(kAliHLTVoidDataType),
259 AliHLTDataSegment(AliHLTUInt8_t* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size)
261 fDataType(kAliHLTVoidDataType),
263 fSegmentOffset(offset),
269 AliHLTDataSegment(void* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size)
271 fDataType(kAliHLTVoidDataType),
272 fPtr((AliHLTUInt8_t*)ptr),
273 fSegmentOffset(offset),
279 AliHLTDataSegment(void* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size, AliHLTComponentDataType dt, AliHLTUInt32_t spec)
282 fPtr((AliHLTUInt8_t*)ptr),
283 fSegmentOffset(offset),
289 AliHLTUInt8_t* GetPtr() const {return (AliHLTUInt8_t*)*this;}
291 AliHLTUInt32_t GetSize() const {return fSegmentSize;}
293 int operator==(const AliHLTDataSegment& seg) const
295 return (fPtr+fSegmentOffset==seg.fPtr+seg.fSegmentOffset) && (fSegmentSize==seg.fSegmentSize);
297 operator AliHLTUInt8_t*() const {return fPtr+fSegmentOffset;}
300 /** the data type of this segment */
301 AliHLTComponentDataType fDataType; // see above
302 /** pointer to the buffer */
303 AliHLTUInt8Pointer_t fPtr; //!transient
304 /** offset in byte within the data buffer */
305 AliHLTUInt32_t fSegmentOffset; // see above
306 /** size of the actual content */
307 AliHLTUInt32_t fSegmentSize; // see above
308 /** data specification */
309 AliHLTUInt32_t fSpecification; // see above
313 * @class AliHLTRawBuffer
314 * @brief Descriptor of the raw data buffer which can host several segments.
316 class AliHLTRawBuffer {
318 /** standard constructor */
319 AliHLTRawBuffer() : fSize(0), fTotalSize(0), fPtr(NULL), fLastEventCount(0) {}
321 AliHLTRawBuffer(AliHLTUInt32_t size);
323 virtual ~AliHLTRawBuffer();
326 * Use a fraction of the buffer.
327 * @param size size in bytes to be used
328 * @return pointer to buffer
330 AliHLTUInt8_t* UseBuffer(AliHLTUInt32_t size);
333 * Check whether buffer fits for a request.
334 * A buffer fits if it is at least of the requested size and at most
335 * the requested size plus a margin. The margin increases with the
336 * number of events the buffer has not been used.
337 * @param size size of the request in bytes
338 * @return 1 if buffer is big enough, 0 if not
340 int CheckSize(AliHLTUInt32_t size) const;
343 * Get used size of the buffer
345 AliHLTUInt32_t GetUsedSize() const {return fSize;}
348 * Get total size of the buffer
350 AliHLTUInt32_t GetTotalSize() const {return fTotalSize;}
353 * Get pointer of data buffer
355 AliHLTUInt8_t* GetPointer() const {return fPtr;}
358 * Write check pattern
360 int WritePattern(const char* pattern, int size);
365 int CheckPattern(const char* pattern, int size) const;
369 * Data buffer remains allocated, used size set to 0
373 int operator==(void*) const;
374 int operator==(AliHLTUInt8_t* ptr) const {return fPtr==ptr;}
375 int operator<=(void*) const;
376 int operator>(void*) const;
377 int operator-(void*) const;
379 operator void*() const {return fPtr;}
380 operator AliHLTUInt8_t*() const {return fPtr;}
383 /** copy constructor prohibited */
384 AliHLTRawBuffer(const AliHLTRawBuffer&);
385 /** assignment operator prohibited */
386 AliHLTRawBuffer& operator=(const AliHLTRawBuffer&);
388 /** size of the currently occupied partition of the buffer */
389 AliHLTUInt32_t fSize; // see above
390 /** total size of the buffer, including safety margin */
391 AliHLTUInt32_t fTotalSize; // see above
393 AliHLTUInt8_t* fPtr; //! transient
394 /** last event count where the buffer has been used */
395 AliHLTUInt32_t fLastEventCount; //! transient
399 /** copy constructor prohibited */
400 AliHLTDataBuffer(const AliHLTDataBuffer&);
401 /** assignment operator prohibited */
402 AliHLTDataBuffer& operator=(const AliHLTDataBuffer&);
404 /* lets see if this is needed
405 AliHLTDataSegment* FindDataSegment(AliHLTComponentDataType datatype);
409 * Find those data segments which match the input types of a component.
410 * @param pConsumer the component which subscribes to the buffer
411 * @param tgtList the list to receive the data segment descriptors
412 * @return: number of data blocks which match the input data types
413 * of the consumer, neg. error code if failed <br>
414 * -EINVAL invalid parameter <br>
416 int FindMatchingDataSegments(const AliHLTComponent* pConsumer,
417 vector<AliHLTDataBuffer::AliHLTDataSegment>& tgtList);
420 * Reset the data buffer.
421 * Removes all consumers back to the @ref fConsumers list, deletes
422 * segments and releases the Raw Buffer.
424 int ResetDataBuffer();
426 //////////////////////////////////////////////////////////////////////////////
428 // the data description
430 // the data segments within this buffer
431 vector<AliHLTDataSegment> fSegments; // see above
433 // the list of all consumers which are going to subscribe to the buffer
434 AliHLTConsumerDescriptorPList fConsumers; // see above
435 // the list of all consumers which are currently subscribed to the buffer
436 AliHLTConsumerDescriptorPList fActiveConsumers; // see above
437 // the list of all consumers which are already released for the current event
438 AliHLTConsumerDescriptorPList fReleasedConsumers; // see above
440 // the buffer instance
441 AliHLTRawBuffer* fpBuffer; //! transient
443 // flags indicating the state of the buffer
444 AliHLTUInt32_t fFlags; // see above
446 /** list of tasks with forwarded data blocks */
447 vector<AliHLTTask*> fForwardedSegmentSources; //! transient
449 /** list of forwarded block descriptors */
450 vector<AliHLTDataSegment> fForwardedSegments; //! transient
452 //////////////////////////////////////////////////////////////////////////////
453 // global buffer handling, internal use only
456 * Create a raw buffer of a certain size.
457 * The function tries to find a buffer of the given size (or a bit bigger by a
458 * certain margin @ref fgMargin) from the list of free buffers.
459 * If no buffer is available, a new one is created and added to the buffer handling.
460 * @param size min. size of the requested buffer
461 * @return pointer to raw buffer
463 static AliHLTRawBuffer* CreateRawBuffer(AliHLTUInt32_t size);
466 * Mark a buffer as free.
467 * After the Data Buffer has finnished using the raw buffer, it is released
468 * and added to the list of available buffers.
469 * @param pBuffer the raw buffer to release
470 * @return >=0 if succeeded, neg. error code if failed
472 static int ReleaseRawBuffer(AliHLTRawBuffer* pBuffer);
475 * Deletes all the raw buffers.
476 * When the last Data Buffer object is destructed, all raw data buffers are
479 static int DeleteRawBuffers();
482 * Number of instances of AliHLTDataBuffer.
483 * The statice variable is incremented and decremented in the constructor/
484 * destructor. All internal data structures are cleaned up when the last
485 * instance is exiting.
487 static int fgNofInstances; // see above
488 /** global list of free raw buffers */
489 static vector<AliHLTRawBuffer*> fgFreeBuffers; // see above
490 /** global list of currently active raw buffers */
491 static vector<AliHLTRawBuffer*> fgActiveBuffers; // see above
492 /** determines the raw buffer size margin at buffer requests */
493 static AliHLTUInt32_t fgMargin; // see above
495 /** global instance to HLT logging class for static methods */
496 static AliHLTLogging fgLogging; // see above
498 /** size of the safety pattern */
499 static const Int_t fgkSafetyPatternSize; // see above
501 /** the safety pattern */
502 static const char fgkSafetyPattern[]; //!transient
504 static AliHLTUInt32_t fgEventCount; //!transient
506 //////////////////////////////////////////////////////////////////////////////
507 // internal helper functions
510 * Find the consumer descriptor for a certain component and data type in
511 * a list of consumers.<br>
512 * <b>Note:</b> There are three lists which contain the consumers in the
514 * @param pConsumer pointer to consumer component
515 * @param list list where to search for the consumer
517 AliHLTConsumerDescriptor* FindConsumer(const AliHLTComponent* pConsumer,
518 AliHLTConsumerDescriptorPList &list) const;
521 * Change the state of a consumer.
522 * The state of a consumer is determined by the list it is strored in, the
523 * method moves a consumer from the source to the target list.
524 * @param pDesc pointer to consumer descriptor
525 * @param srcList list where the consumer is currently to be found
526 * @param tgtList list where to move the consumer
528 int ChangeConsumerState(AliHLTConsumerDescriptor* pDesc,
529 AliHLTConsumerDescriptorPList &srcList,
530 AliHLTConsumerDescriptorPList &tgtList);
533 * Cleanup a consumer list.
534 * Release all allocated data structures. <b>Note:</b> Not the component itself!
536 int CleanupConsumerList();
538 ClassDef(AliHLTDataBuffer, 1)
541 #endif // ALIHLTDATABUFFER_H