DistributedVector.hpp

00001 /*
00002 
00003 Copyright (C) University of Oxford, 2005-2011
00004 
00005 University of Oxford means the Chancellor, Masters and Scholars of the
00006 University of Oxford, having an administrative office at Wellington
00007 Square, Oxford OX1 2JD, UK.
00008 
00009 This file is part of Chaste.
00010 
00011 Chaste is free software: you can redistribute it and/or modify it
00012 under the terms of the GNU Lesser General Public License as published
00013 by the Free Software Foundation, either version 2.1 of the License, or
00014 (at your option) any later version.
00015 
00016 Chaste is distributed in the hope that it will be useful, but WITHOUT
00017 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00018 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00019 License for more details. The offer of Chaste under the terms of the
00020 License is subject to the License being interpreted in accordance with
00021 English Law and subject to any action against the University of Oxford
00022 being under the jurisdiction of the English Courts.
00023 
00024 You should have received a copy of the GNU Lesser General Public License
00025 along with Chaste. If not, see <http://www.gnu.org/licenses/>.
00026 
00027 */
00028 
00029 
00030 #ifndef DISTRIBUTEDVECTOR_HPP_
00031 #define DISTRIBUTEDVECTOR_HPP_
00032 
00033 #include <vector>
00034 #include <petscvec.h>
00035 #include <iostream>
00036 #include <cassert>
00037 
00038 #include "DistributedVectorException.hpp"
00039 
00040 class DistributedVectorFactory;
00041 
00048 class DistributedVector
00049 {
00050 private:
00051     friend class TestDistributedVector;
00052 
00053     // Data global to all vectors.
00054 
00056     unsigned mLo;
00057 
00059     unsigned mHi;
00060 
00062     unsigned mProblemSize;
00063 
00064     // Data local to a single vector.
00066     unsigned mSizeMultiplier;
00068     Vec mVec;
00070     double* mpVec;
00071 
00076     DistributedVectorFactory* mpFactory;
00077 
00078 public:
00079 
00085     bool IsGlobalIndexLocal(unsigned globalIndex);
00086 
00096     DistributedVector(Vec vec, DistributedVectorFactory* pFactory);
00097 
00101     unsigned GetHigh() const
00102     {
00103         return mHi;
00104     }
00105 
00109     unsigned GetLow() const
00110     {
00111         return mLo;
00112     }
00113 
00117     DistributedVectorFactory* GetFactory()
00118     {
00119         return mpFactory;
00120     }
00121 
00129     double& operator[](unsigned globalIndex) throw (DistributedVectorException);
00130 
00136     void Restore();
00137 
00142     class Iterator
00143     {
00144     public:
00145         unsigned Local;  
00146         unsigned Global; 
00153         bool operator!=(const Iterator& rOther);
00154 
00156         Iterator& operator++();
00157     };
00158 
00166     class Stripe
00167     {
00168         unsigned mStride; 
00169         unsigned mStripe; 
00170         double* mpVec;    
00171         unsigned mLo;     
00172         unsigned mHi;     
00173         DistributedVectorFactory* mpFactory; 
00175     public:
00182         Stripe(DistributedVector parallelVec, unsigned stripe)
00183         {
00184             mStride = parallelVec.mSizeMultiplier;
00185             mStripe = stripe;
00186             assert(mStripe < mStride);
00187             mpVec = parallelVec.mpVec;
00188             mLo = parallelVec.GetLow();
00189             mHi = parallelVec.GetHigh();
00190             mpFactory = parallelVec.GetFactory();
00191         }
00192 
00196         DistributedVectorFactory* GetFactory()
00197         {
00198             return mpFactory;
00199         }
00200 
00209         double& operator[](unsigned globalIndex) throw (DistributedVectorException)
00210         {
00211             if (mLo <= globalIndex && globalIndex < mHi)
00212             {
00213                 return mpVec[(globalIndex - mLo)*mStride + mStripe];
00214             }
00215             throw DistributedVectorException();
00216         }
00217 
00222         double& operator[](Iterator index) throw (DistributedVectorException)
00223         {
00224             return mpVec[index.Local*mStride + mStripe];
00225         }
00226 
00227     };
00228 
00236     class Chunk
00237     {
00238         unsigned mOffset; 
00239         double* mpVec;    
00240         unsigned mLo;     
00241         unsigned mHi;     
00243     public:
00250         Chunk(DistributedVector parallelVec, unsigned chunk)
00251         {
00252             assert(chunk < parallelVec.mSizeMultiplier);
00253             mLo = parallelVec.GetLow();
00254             mHi = parallelVec.GetHigh();
00255             mOffset = chunk * (mHi - mLo);
00256             mpVec = parallelVec.mpVec;
00257         }
00258 
00267         double& operator[](unsigned globalIndex) throw (DistributedVectorException)
00268         {
00269             if (mLo <= globalIndex && globalIndex < mHi)
00270             {
00271                 //localIndex = globalIndex - mLo
00272                 return mpVec[mOffset + globalIndex - mLo];
00273             }
00274             throw DistributedVectorException();
00275          }
00276 
00281         double& operator[](Iterator index) throw (DistributedVectorException)
00282         {
00283             return mpVec[mOffset + index.Local];
00284         }
00285 
00286     };
00287 
00292     Iterator Begin();
00293 
00298     Iterator End();
00299 
00305     double& operator[](Iterator index) throw (DistributedVectorException);
00306 };
00307 
00308 
00309 
00310 #endif /*DISTRIBUTEDVECTOR_HPP_*/

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