[root] Log of /trunk/tree/tree/inc/TBranchRef.h

Revision 40872 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Sep 13 21:33:33 2011 UTC (3 years, 4 months ago) by pcanal
File length: 2120 byte(s)
Diff to previous 39611

From Chris Jones:

Put in place the infrastructure to optimize the I/O writes in the same way we optimized the I/O reads.

Rename TBuffer::ReadSequence to TBuffer::ApplySequence as they can be used both for reading and writing.  The 3 new signatures:

1. virtual Int_t ApplySequence(const TStreamerInfoActions::TActionSequence &sequence, void *object);      
2. virtual Int_t ApplySequenceVecPtr(const TStreamerInfoActions::TActionSequence &sequence, void *start_collection, void *end_collection);      
3. virtual Int_t ApplySequence(const TStreamerInfoActions::TActionSequence &sequence, void *start_collection, void *end_collection);

The 1st version is optimized to read a single object. The 2nd version is optimized to read the content of TClonesArrays and vectors of pointers to objects.
The 3rd version is used to streamed any collections.

In TBranchElement, introduce a set FillLeaves member functions to precalculate many of the (existing) conditional.  Introduction support for the StreamerInfo write actions and sequences.

Revision 39611 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Wed Jun 8 19:35:17 2011 UTC (3 years, 7 months ago) by pcanal
File length: 2124 byte(s)
Diff to previous 38854

Introduce TMemFile and update TFileMerger to support incremental merges.

Add new tutorials ( net/treeClient.C + net/fastMergeServer.C )
demonstrating how a TMemFile can be used to do parallel merge
from many client. ( TMemFile still needs to be better integrated
with TMessage and TSocket).

The new TMemFile class support the TFile interface but only store
the information in memory.   This version is limited to 32MB.

   TMessage mess;
   ... 
   mess->ReadFastArray(scratch,length);
   transient = new TMemFile("hsimple.memroot",scratch,length);

will copy the content of 'scratch' into the in-memory buffer
created by/for the TMemFile.

   TMemFile *file = new TMemFile("hsimple.memroot","RECREATE");

Will create an empty in-memory of (currently fixed) size 32MB.

   file->ResetAfterMerge(0);

Will reset the objects in the TDirectory list of objects
so that they are ready for more data accumulations (i.e.
returns the data to 0 but keep the customizations).

Introduce the new function TFileMerger::IncrementalMerge will
will Merge the list of file _with_ the content of the output
file (if any).   This allows make several successive Merge
into the same TFile object.

Introduce non-static version of TFile::Cp allows the copy of
an existing TFile object.

Introduce new explicit interface for providing reseting 
capability after a merge.  If a class has a method with 
the name and signature:

   void ResetAfterMerge(TFileMergeInfo*);

it will be used by a TMemFile to reset its objects after
a merge operation has been done.

If this method does not exist, the TClass will use
a method with the name and signature:
  
   void Reset(Optiont_t *);

TClass now provides a quick access to these merging 
function via TClass::GetResetAfterMerge.   The wrapper function
is automatically created by rootcint and can be installed
via TClass::SetResetAfterMerge.   The wrapper function should have
the signature/type ROOT::ResetAfterMergeFunc_t:

   void (*)(void *thisobj, TFileMergeInfo*);

ResetAfterMerge functions were added to the following classes:
TDirectoryFile, TMemFile, TTree, TChain, TBranch, TBranhcElement, 
TBranchClones, TBranchObject and TBranchRef.

Revision 38854 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Thu Apr 14 18:03:34 2011 UTC (3 years, 9 months ago) by pcanal
File length: 2070 byte(s)
Diff to previous 37275

In TBranchRef distinguish between the entry we need (now called RequestedEntry) and the
entry we have read (fReadEntry) so that we can avoid re-reading the same entry too many
times.

Revision 34969 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Aug 24 19:01:19 2010 UTC (4 years, 5 months ago) by pcanal
File length: 1977 byte(s)
Diff to previous 22902

Replace the ReadLeaves virtual function by a fReadLeaves pointer to member function,
this allows the customization of the ReadLeaves function at run-time depending on the
underlying user class layout in TBranchElement.  This removes many if statements whose
'answer' is known at initialization time.  [ReadLeavesMakeClass and ReadLeavesCollection
still need further decomposition]

Introduce TBranch::Set/GetMakeClass to independently set each branch in MakeClass mode 
and to have a good place to switch the ReadLeaves function appropriately (to and from
the MakeClass mode (also known as the decomposed object mode)).   This can also be
used to reset the mode of some branch with a MakeClass/MakeSelector file.

Revision 20882 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Mon Nov 19 11:31:26 2007 UTC (7 years, 2 months ago) by rdm
Original Path: trunk/tree/inc/TBranchRef.h
File length: 1980 byte(s)
Diff to previous 19826

Set property svn:eol-style LF on all source and Makefiles. This should avoid
problems with Win32 line endings ending up in the repository. All MS tools
support LF eols fine.

Revision 18209 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Thu Mar 8 23:29:01 2007 UTC (7 years, 10 months ago) by pcanal
Original Path: trunk/tree/inc/TBranchRef.h
File length: 2042 byte(s)
Diff to previous 13207

From Paul:
Modify TRefTable, TBranchRef, and TBranchElement so that the small
integer which is assigned to identify a TBranchElement by TRefTable
is cached so that we need to find it only once, instead of at every
call to TBranchElement::GetEntry() or TBranchElement::Fill().

Revision 9831 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Aug 24 10:41:58 2004 UTC (10 years, 5 months ago) by brun
Original Path: trunk/tree/inc/TBranchRef.h
File length: 2029 byte(s)
Diff to previous 9801

Improve the functionality of the TRefTable.
The new algorithm
  -does not require a pointer to the TRefTable in TFile.
  -can automatically load the branch of a Tree when calling TRef::GetObject
  -works when writing/reading multiple Trees in parallel

Revision 9801 - (view) (download) (as text) (annotate) - [select for diffs]
Added Fri Aug 20 14:54:53 2004 UTC (10 years, 5 months ago) by brun
Original Path: trunk/tree/inc/TBranchRef.h
File length: 1928 byte(s)

New class TBranchRef deriving from TBranch.
This is a special branch keeping the information about the
branch numbers having referenced objects.
The TBranchRef object is created by the new function
   TTree::BranchRef

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