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 * @class AliHLTDataSegment
230 * @brief Descriptor of a data segment within the buffer.
232 class AliHLTDataSegment {
233 friend class AliHLTDataBuffer;
234 friend class AliHLTConsumerDescriptor;
238 fDataType(kAliHLTVoidDataType),
246 AliHLTDataSegment(AliHLTUInt8_t* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size)
248 fDataType(kAliHLTVoidDataType),
250 fSegmentOffset(offset),
256 AliHLTDataSegment(void* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size)
258 fDataType(kAliHLTVoidDataType),
259 fPtr((AliHLTUInt8_t*)ptr),
260 fSegmentOffset(offset),
266 AliHLTDataSegment(void* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size, AliHLTComponentDataType dt, AliHLTUInt32_t spec)
269 fPtr((AliHLTUInt8_t*)ptr),
270 fSegmentOffset(offset),
276 AliHLTUInt8_t* GetPtr() const {return (AliHLTUInt8_t*)*this;}
278 AliHLTUInt32_t GetSize() const {return fSegmentSize;}
280 int operator==(const AliHLTDataSegment& seg) const
282 return (fPtr+fSegmentOffset==seg.fPtr+seg.fSegmentOffset) && (fSegmentSize==seg.fSegmentSize);
284 operator AliHLTUInt8_t*() const {return fPtr+fSegmentOffset;}
287 /** the data type of this segment */
288 AliHLTComponentDataType fDataType; // see above
289 /** pointer to the buffer */
290 AliHLTUInt8Pointer_t fPtr; //!transient
291 /** offset in byte within the data buffer */
292 AliHLTUInt32_t fSegmentOffset; // see above
293 /** size of the actual content */
294 AliHLTUInt32_t fSegmentSize; // see above
295 /** data specification */
296 AliHLTUInt32_t fSpecification; // see above
300 * @class AliHLTRawBuffer
301 * @brief Descriptor of the raw data buffer which can host several segments.
303 class AliHLTRawBuffer {
305 /** standard constructor */
306 AliHLTRawBuffer() : fSize(0), fTotalSize(0), fPtr(NULL) {}
308 AliHLTRawBuffer(AliHLTUInt32_t size);
310 virtual ~AliHLTRawBuffer();
313 * Use a fraction of the buffer.
314 * @param size size in bytes to be used
315 * @return pointer to buffer
317 AliHLTUInt8_t* UseBuffer(AliHLTUInt32_t size);
320 * Check whether buffer fits for a request.
321 * @param size size of the request in bytes
322 * @return 1 if buffer is big enough, 0 if not
324 int CheckSize(AliHLTUInt32_t size) const;
327 * Get used size of the buffer
329 AliHLTUInt32_t GetUsedSize() const {return fSize;}
332 * Get total size of the buffer
334 AliHLTUInt32_t GetTotalSize() const {return fTotalSize;}
337 * Get pointer of data buffer
339 AliHLTUInt8_t* GetPointer() const {return fPtr;}
342 * Write check pattern
344 int WritePattern(const char* pattern, int size);
349 int CheckPattern(const char* pattern, int size) const;
353 * Data buffer remains allocated, used size set to 0
357 int operator==(void*) const;
358 int operator==(AliHLTUInt8_t* ptr) const {return fPtr==ptr;}
359 int operator<=(void*) const;
360 int operator>(void*) const;
361 int operator-(void*) const;
363 operator void*() const {return fPtr;}
364 operator AliHLTUInt8_t*() const {return fPtr;}
367 /** copy constructor prohibited */
368 AliHLTRawBuffer(const AliHLTRawBuffer&);
369 /** assignment operator prohibited */
370 AliHLTRawBuffer& operator=(const AliHLTRawBuffer&);
372 /** size of the currently occupied partition of the buffer */
373 AliHLTUInt32_t fSize; // see above
374 /** total size of the buffer, including safety margin */
375 AliHLTUInt32_t fTotalSize; // see above
377 AliHLTUInt8_t* fPtr; //! transient
381 /** copy constructor prohibited */
382 AliHLTDataBuffer(const AliHLTDataBuffer&);
383 /** assignment operator prohibited */
384 AliHLTDataBuffer& operator=(const AliHLTDataBuffer&);
386 /* lets see if this is needed
387 AliHLTDataSegment* FindDataSegment(AliHLTComponentDataType datatype);
391 * Find those data segments which match the input types of a component.
392 * @param pConsumer the component which subscribes to the buffer
393 * @param tgtList the list to receive the data segment descriptors
394 * @return: number of data blocks which match the input data types
395 * of the consumer, neg. error code if failed <br>
396 * -EINVAL invalid parameter <br>
398 int FindMatchingDataSegments(const AliHLTComponent* pConsumer,
399 vector<AliHLTDataBuffer::AliHLTDataSegment>& tgtList);
402 * Reset the data buffer.
403 * Removes all consumers back to the @ref fConsumers list, deletes
404 * segments and releases the Raw Buffer.
406 int ResetDataBuffer();
408 //////////////////////////////////////////////////////////////////////////////
410 // the data description
412 // the data segments within this buffer
413 vector<AliHLTDataSegment> fSegments; // see above
415 // the list of all consumers which are going to subscribe to the buffer
416 AliHLTConsumerDescriptorPList fConsumers; // see above
417 // the list of all consumers which are currently subscribed to the buffer
418 AliHLTConsumerDescriptorPList fActiveConsumers; // see above
419 // the list of all consumers which are already released for the current event
420 AliHLTConsumerDescriptorPList fReleasedConsumers; // see above
422 // the buffer instance
423 AliHLTRawBuffer* fpBuffer; //! transient
425 // flags indicating the state of the buffer
426 AliHLTUInt32_t fFlags; // see above
428 /** list of tasks with forwarded data blocks */
429 vector<AliHLTTask*> fForwardedSegmentSources; //! transient
431 /** list of forwarded block descriptors */
432 vector<AliHLTDataSegment> fForwardedSegments; //! transient
434 //////////////////////////////////////////////////////////////////////////////
435 // global buffer handling, internal use only
438 * Create a raw buffer of a certain size.
439 * The function tries to find a buffer of the given size (or a bit bigger by a
440 * certain margin @ref fgMargin) from the list of free buffers.
441 * If no buffer is available, a new one is created and added to the buffer handling.
442 * @param size min. size of the requested buffer
443 * @return pointer to raw buffer
445 static AliHLTRawBuffer* CreateRawBuffer(AliHLTUInt32_t size);
448 * Mark a buffer as free.
449 * After the Data Buffer has finnished using the raw buffer, it is released
450 * and added to the list of available buffers.
451 * @param pBuffer the raw buffer to release
452 * @return >=0 if succeeded, neg. error code if failed
454 static int ReleaseRawBuffer(AliHLTRawBuffer* pBuffer);
457 * Deletes all the raw buffers.
458 * When the last Data Buffer object is destructed, all raw data buffers are
461 static int DeleteRawBuffers();
464 * Number of instances of AliHLTDataBuffer.
465 * The statice variable is incremented and decremented in the constructor/
466 * destructor. All internal data structures are cleaned up when the last
467 * instance is exiting.
469 static int fgNofInstances; // see above
470 /** global list of free raw buffers */
471 static vector<AliHLTRawBuffer*> fgFreeBuffers; // see above
472 /** global list of currently active raw buffers */
473 static vector<AliHLTRawBuffer*> fgActiveBuffers; // see above
474 /** determines the raw buffer size margin at buffer requests */
475 static AliHLTUInt32_t fgMargin; // see above
477 /** global instance to HLT logging class for static methods */
478 static AliHLTLogging fgLogging; // see above
480 /** size of the safety pattern */
481 static const Int_t fgkSafetyPatternSize; // see above
483 /** the safety pattern */
484 static const char fgkSafetyPattern[]; //!transient
486 //////////////////////////////////////////////////////////////////////////////
487 // internal helper functions
490 * Find the consumer descriptor for a certain component and data type in
491 * a list of consumers.<br>
492 * <b>Note:</b> There are three lists which contain the consumers in the
494 * @param pConsumer pointer to consumer component
495 * @param list list where to search for the consumer
497 AliHLTConsumerDescriptor* FindConsumer(const AliHLTComponent* pConsumer,
498 AliHLTConsumerDescriptorPList &list) const;
501 * Change the state of a consumer.
502 * The state of a consumer is determined by the list it is strored in, the
503 * method moves a consumer from the source to the target list.
504 * @param pDesc pointer to consumer descriptor
505 * @param srcList list where the consumer is currently to be found
506 * @param tgtList list where to move the consumer
508 int ChangeConsumerState(AliHLTConsumerDescriptor* pDesc,
509 AliHLTConsumerDescriptorPList &srcList,
510 AliHLTConsumerDescriptorPList &tgtList);
513 * Cleanup a consumer list.
514 * Release all allocated data structures. <b>Note:</b> Not the component itself!
516 int CleanupConsumerList();
518 ClassDef(AliHLTDataBuffer, 0)
521 #endif // ALIHLTDATABUFFER_H