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 AliHLTComponentBlockData* arrayBlockDesc,
114 * Release an instance of the data buffer.
115 * Resets the variables of the block descriptor.
116 * If all buffer segments are released, the Data Buffer is reseted
117 * and the Raw Buffer released.<br>
118 * The method is used by the consumer component.
119 * @param pBlockDesc descriptor of the data segment
120 * @param pConsumer the component which subscribes to the buffer
121 * @param pOwnerTask task owning this buffer
122 * @return: >0 if success, negative error code if failed <br>
123 * -EACCESS the consumer state can not be changed (de-activated)
124 * -ENOENT consumer has not subscribed to the buffer <br>
125 * -EINVAL invalid parameter <br>
127 int Release(AliHLTComponentBlockData* pBlockDesc, const AliHLTComponent* pConsumer,
128 const AliHLTTask* pOwnerTask);
131 * Register an input data block for forwarding.
132 * Consumer of this data buffer subscribe to forwarded data blocks in te same way.
133 * Forwarded data blocks are released when the last consumer has released the
135 * @param pSrcTask original source task of the data block
136 * @param pBlockDesc descriptor of the data segment
138 int Forward(AliHLTTask* pSrcTask, AliHLTComponentBlockData* pBlockDesc);
141 * Get a target buffer of minimum size iMinSize.
142 * The method is used by the component which owns the Data Buffer to
143 * allocate a buffer for the data it is going to produce.
144 * @param iMinSize minumum size of the requested buffer
145 * @return: pointer to target buffer if
147 AliHLTUInt8_t* GetTargetBuffer(int iMinSize);
150 * Set the segments for the data buffer.
151 * This is usually done after the component has written the data to the buffer,
152 * which was requested by the @ref GetTargetBuffer method. The component might
153 * produce different types of data, for each type a segment has to be defined
154 * which describes the data inside the buffer.<br>
155 * The @ref AliHLTComponentBlockData segment descriptor comes directly from
156 * the @ref AliHLTComponent::ProcessEvent method.
157 * @param pTgt the target buffer which the segments refer to
158 * @param arraySegments the output block descriptors of the component
159 * @param iSize size of the array
161 int SetSegments(AliHLTUInt8_t* pTgt, AliHLTComponentBlockData* arraySegments, int iSize);
164 * Check if the data buffer is empty.
165 * @return 1 if empty, 0 if not
170 * Get the total and maximum size of the buffer.
171 * Lets see if this is needed later
173 //int GetTotalSize();
176 * Get the number of segments
177 * @return number of segments
179 int GetNofSegments();
182 * Get the total number of consumers.
183 * This gives the number of consumers regardless of their state.
184 * @return number of consumers
186 int GetNofConsumers();
189 * Get the number of consumers which still need to be processed during
191 * @return number of consumers
193 int GetNofPendingConsumers();
196 * Get the number of consumers currently under processing.
197 * @return number of active consumers
199 int GetNofActiveConsumers();
202 * Check if a consumer is already in the list
203 * @param pConsumer pointer to consumer component
204 * @param bAllLists search in all lists if 1
205 * search only in fConsumer list if 0
206 * @return 1 if found, 0 if not
208 int FindConsumer(AliHLTComponent* pConsumer, int bAllLists=1);
211 * Public method to reset the buffer.
212 * Eventually with some additional checks. In normal operation,
213 * an external reset should not be necessary.
218 * Set local logging level
219 * logging filter for individual object
221 void SetLocalLoggingLevel(AliHLTComponentLogSeverity level)
222 {fgLogging.SetLocalLoggingLevel(level); AliHLTLogging::SetLocalLoggingLevel(level);}
225 * @class AliHLTDataSegment
226 * @brief Descriptor of a data segment within the buffer.
228 class AliHLTDataSegment {
229 friend class AliHLTDataBuffer;
230 friend class AliHLTConsumerDescriptor;
234 fDataType(kAliHLTVoidDataType),
242 AliHLTDataSegment(AliHLTUInt8_t* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size)
244 fDataType(kAliHLTVoidDataType),
246 fSegmentOffset(offset),
252 AliHLTDataSegment(void* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size)
254 fDataType(kAliHLTVoidDataType),
255 fPtr((AliHLTUInt8_t*)ptr),
256 fSegmentOffset(offset),
262 AliHLTDataSegment(void* ptr, AliHLTUInt32_t offset, AliHLTUInt32_t size, AliHLTComponentDataType dt, AliHLTUInt32_t spec)
265 fPtr((AliHLTUInt8_t*)ptr),
266 fSegmentOffset(offset),
272 AliHLTUInt8_t* GetPtr() const {return (AliHLTUInt8_t*)*this;}
274 AliHLTUInt32_t GetSize() const {return fSegmentSize;}
276 int operator==(const AliHLTDataSegment& seg) const
278 return (fPtr+fSegmentOffset==seg.fPtr+seg.fSegmentOffset) && (fSegmentSize==seg.fSegmentSize);
280 operator AliHLTUInt8_t*() const {return fPtr+fSegmentOffset;}
283 /** the data type of this segment */
284 AliHLTComponentDataType fDataType; // see above
285 /** pointer to the buffer */
286 AliHLTUInt8Pointer_t fPtr; //!transient
287 /** offset in byte within the data buffer */
288 AliHLTUInt32_t fSegmentOffset; // see above
289 /** size of the actual content */
290 AliHLTUInt32_t fSegmentSize; // see above
291 /** data specification */
292 AliHLTUInt32_t fSpecification; // see above
296 * @class AliHLTRawBuffer
297 * @brief Descriptor of the raw data buffer which can host several segments.
299 class AliHLTRawBuffer {
301 /** standard constructor */
302 AliHLTRawBuffer() : fSize(0), fTotalSize(0), fPtr(NULL) {}
304 AliHLTRawBuffer(AliHLTUInt32_t size);
306 virtual ~AliHLTRawBuffer();
309 * Use a fraction of the buffer.
310 * @param size size in bytes to be used
311 * @return pointer to buffer
313 AliHLTUInt8_t* UseBuffer(AliHLTUInt32_t size);
316 * Check whether buffer fits for a request.
317 * @param size size of the request in bytes
318 * @return 1 if buffer is big enough, 0 if not
320 int CheckSize(AliHLTUInt32_t size) const;
323 * Get used size of the buffer
325 AliHLTUInt32_t GetUsedSize() const {return fSize;}
328 * Get total size of the buffer
330 AliHLTUInt32_t GetTotalSize() const {return fTotalSize;}
333 * Get pointer of data buffer
335 AliHLTUInt8_t* GetPointer() const {return fPtr;}
338 * Write check pattern
340 int WritePattern(const char* pattern, int size);
345 int CheckPattern(const char* pattern, int size) const;
349 * Data buffer remains allocated, used size set to 0
353 int operator==(void*) const;
354 int operator==(AliHLTUInt8_t* ptr) const {return fPtr==ptr;}
355 int operator<=(void*) const;
356 int operator>(void*) const;
357 int operator-(void*) const;
359 operator void*() const {return fPtr;}
360 operator AliHLTUInt8_t*() const {return fPtr;}
363 /** copy constructor prohibited */
364 AliHLTRawBuffer(const AliHLTRawBuffer&);
365 /** assignment operator prohibited */
366 AliHLTRawBuffer& operator=(const AliHLTRawBuffer&);
368 /** size of the currently occupied partition of the buffer */
369 AliHLTUInt32_t fSize; // see above
370 /** total size of the buffer, including safety margin */
371 AliHLTUInt32_t fTotalSize; // see above
373 AliHLTUInt8_t* fPtr; //! transient
377 /** copy constructor prohibited */
378 AliHLTDataBuffer(const AliHLTDataBuffer&);
379 /** assignment operator prohibited */
380 AliHLTDataBuffer& operator=(const AliHLTDataBuffer&);
382 /* lets see if this is needed
383 AliHLTDataSegment* FindDataSegment(AliHLTComponentDataType datatype);
387 * Find those data segments which match the input types of a component.
388 * @param pConsumer the component which subscribes to the buffer
389 * @param tgtList the list to receive the data segment descriptors
390 * @return: number of data blocks which match the input data types
391 * of the consumer, neg. error code if failed <br>
392 * -EINVAL invalid parameter <br>
394 int FindMatchingDataSegments(const AliHLTComponent* pConsumer,
395 vector<AliHLTDataBuffer::AliHLTDataSegment>& tgtList);
398 * Reset the data buffer.
399 * Removes all consumers back to the @ref fConsumers list, deletes
400 * segments and releases the Raw Buffer.
402 int ResetDataBuffer();
404 //////////////////////////////////////////////////////////////////////////////
406 // the data description
408 // the data segments within this buffer
409 vector<AliHLTDataSegment> fSegments; // see above
411 // the list of all consumers which are going to subscribe to the buffer
412 AliHLTConsumerDescriptorPList fConsumers; // see above
413 // the list of all consumers which are currently subscribed to the buffer
414 AliHLTConsumerDescriptorPList fActiveConsumers; // see above
415 // the list of all consumers which are already released for the current event
416 AliHLTConsumerDescriptorPList fReleasedConsumers; // see above
418 // the buffer instance
419 AliHLTRawBuffer* fpBuffer; //! transient
421 // flags indicating the state of the buffer
422 AliHLTUInt32_t fFlags; // see above
424 /** list of tasks with forwarded data blocks */
425 vector<AliHLTTask*> fForwardedSegmentSources; //! transient
427 /** list of forwarded block descriptors */
428 vector<AliHLTDataSegment> fForwardedSegments; //! transient
430 //////////////////////////////////////////////////////////////////////////////
431 // global buffer handling, internal use only
434 * Create a raw buffer of a certain size.
435 * The function tries to find a buffer of the given size (or a bit bigger by a
436 * certain margin @ref fgMargin) from the list of free buffers.
437 * If no buffer is available, a new one is created and added to the buffer handling.
438 * @param size min. size of the requested buffer
439 * @return pointer to raw buffer
441 static AliHLTRawBuffer* CreateRawBuffer(AliHLTUInt32_t size);
444 * Mark a buffer as free.
445 * After the Data Buffer has finnished using the raw buffer, it is released
446 * and added to the list of available buffers.
447 * @param pBuffer the raw buffer to release
448 * @return >=0 if succeeded, neg. error code if failed
450 static int ReleaseRawBuffer(AliHLTRawBuffer* pBuffer);
453 * Deletes all the raw buffers.
454 * When the last Data Buffer object is destructed, all raw data buffers are
457 static int DeleteRawBuffers();
460 * Number of instances of AliHLTDataBuffer.
461 * The statice variable is incremented and decremented in the constructor/
462 * destructor. All internal data structures are cleaned up when the last
463 * instance is exiting.
465 static int fgNofInstances; // see above
466 /** global list of free raw buffers */
467 static vector<AliHLTRawBuffer*> fgFreeBuffers; // see above
468 /** global list of currently active raw buffers */
469 static vector<AliHLTRawBuffer*> fgActiveBuffers; // see above
470 /** determines the raw buffer size margin at buffer requests */
471 static AliHLTUInt32_t fgMargin; // see above
473 /** global instance to HLT logging class for static methods */
474 static AliHLTLogging fgLogging; // see above
476 /** size of the safety pattern */
477 static const Int_t fgkSafetyPatternSize; // see above
479 /** the safety pattern */
480 static const char fgkSafetyPattern[]; //!transient
482 //////////////////////////////////////////////////////////////////////////////
483 // internal helper functions
486 * Find the consumer descriptor for a certain component and data type in
487 * a list of consumers.<br>
488 * <b>Note:</b> There are three lists which contain the consumers in the
490 * @param pConsumer pointer to consumer component
491 * @param list list where to search for the consumer
493 AliHLTConsumerDescriptor* FindConsumer(const AliHLTComponent* pConsumer,
494 AliHLTConsumerDescriptorPList &list) const;
497 * Change the state of a consumer.
498 * The state of a consumer is determined by the list it is strored in, the
499 * method moves a consumer from the source to the target list.
500 * @param pDesc pointer to consumer descriptor
501 * @param srcList list where the consumer is currently to be found
502 * @param tgtList list where to move the consumer
504 int ChangeConsumerState(AliHLTConsumerDescriptor* pDesc,
505 AliHLTConsumerDescriptorPList &srcList,
506 AliHLTConsumerDescriptorPList &tgtList);
509 * Cleanup a consumer list.
510 * Release all allocated data structures. <b>Note:</b> Not the component itself!
512 int CleanupConsumerList();
514 ClassDef(AliHLTDataBuffer, 0)
517 #endif // ALIHLTDATABUFFER_H