BernoulliSamplingExecStream.h

Go to the documentation of this file.
00001 /*
00002 // $Id: //open/dev/fennel/exec/BernoulliSamplingExecStream.h#4 $
00003 // Fennel is a library of data storage and processing components.
00004 // Copyright (C) 2007-2009 The Eigenbase Project
00005 // Copyright (C) 2007-2009 SQLstream, Inc.
00006 // Copyright (C) 2007-2009 LucidEra, Inc.
00007 //
00008 // This program is free software; you can redistribute it and/or modify it
00009 // under the terms of the GNU General Public License as published by the Free
00010 // Software Foundation; either version 2 of the License, or (at your option)
00011 // any later version approved by The Eigenbase Project.
00012 //
00013 // This program is distributed in the hope that it will be useful,
00014 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00015 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016 // GNU General Public License for more details.
00017 //
00018 // You should have received a copy of the GNU General Public License
00019 // along with this program; if not, write to the Free Software
00020 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00021 */
00022 
00023 #ifndef Fennel_BernoulliSamplingExecStream_Included
00024 #define Fennel_BernoulliSamplingExecStream_Included
00025 
00026 #include <boost/scoped_ptr.hpp>
00027 #include "fennel/exec/ConduitExecStream.h"
00028 #include "fennel/common/BernoulliRng.h"
00029 #include "fennel/tuple/TupleData.h"
00030 
00031 FENNEL_BEGIN_NAMESPACE
00032 
00037 struct FENNEL_EXEC_EXPORT BernoulliSamplingExecStreamParams
00038     : public ConduitExecStreamParams
00039 {
00041     float samplingRate;
00042 
00044     bool isRepeatable;
00045 
00047     int32_t repeatableSeed;
00048 };
00049 
00057 class FENNEL_EXEC_EXPORT BernoulliSamplingExecStream
00058     : public ConduitExecStream
00059 {
00061     float samplingRate;
00062 
00064     bool isRepeatable;
00065 
00067     int32_t repeatableSeed;
00068 
00072     boost::scoped_ptr<BernoulliRng> samplingRng;
00073 
00077     bool producePending;
00078 
00079     TupleData data;
00080 
00081 public:
00082     virtual void prepare(BernoulliSamplingExecStreamParams const &params);
00083     virtual void open(bool restart);
00084     virtual ExecStreamResult execute(ExecStreamQuantum const &quantum);
00085 };
00086 
00087 FENNEL_END_NAMESPACE
00088 
00089 #endif
00090 
00091 // End BernoulliSamplingExecStream.h

Generated on Mon Jun 22 04:00:18 2009 for Fennel by  doxygen 1.5.1