src/io/ifstrstream.cpp

/*
 * Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
 *
 * The University of Notre Dame grants you ("Licensee") a
 * non-exclusive, royalty free, license to use, modify and
 * redistribute this software in source and binary code form, provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. All express or implied conditions, representations and
 * warranties, including any implied warranty of merchantability,
 * fitness for a particular purpose or non-infringement, are hereby
 * excluded.  The University of Notre Dame and its licensors shall not
 * be liable for any damages suffered by licensee as a result of
 * using, modifying or distributing the software or its
 * derivatives. In no event will the University of Notre Dame or its
 * licensors be liable for any lost revenue, profit or data, or for
 * direct, indirect, special, consequential, incidental or punitive
 * damages, however caused and regardless of the theory of liability,
 * arising out of the use of or inability to use software, even if the
 * University of Notre Dame has been advised of the possibility of
 * such damages.
 *
 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *                                                                      
 * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).             
 * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).          
 * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).          
 * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
 * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 */
 
/**
 * @file basic_ifstrstream.cpp
 * @author Teng Lin
 * @date 10/14/2004
 * @version 1.0
 */

#include "io/ifstrstream.hpp"

#ifdef IS_MPI
#include <mpi.h>
#endif

namespace OpenMD {
  
  /**  Constructs an object of class ifstream.  */
#ifdef IS_MPI
  ifstrstream::ifstrstream() 
    :  std::basic_istream<char, std::char_traits<char> >(0),
       internalStringBuf_(), isRead(false)  {    
    this->init(&internalStringBuf_);
  }
#else
  ifstrstream::ifstrstream() 
    :  std::basic_istream<char, std::char_traits<char> >(0),
       internalFileBuf_(), isRead(false)  {    
    this->init(&internalFileBuf_);
  }
#endif
  
  /**
   * Explicit constructor
   * @filename String containing the name of the file to be opened
   * @mode Flags describing the requested i/o mode for the file, default value is ios_base::in      
   * @checkFilename Flags indicating checking the file name in parallel
   */
#ifdef IS_MPI
  ifstrstream::ifstrstream(const char* filename, std::ios_base::openmode mode, bool checkFilename)
    :  std::basic_istream<char, std::char_traits<char> >(0),
       internalStringBuf_(), isRead(false) {
    this->init(&internalStringBuf_);
    isRead =  internalOpen(filename,  mode | std::ios_base::in, checkFilename);
  }
#else
  ifstrstream::ifstrstream(const char* filename, std::ios_base::openmode mode, bool checkFilename)
    :  std::basic_istream<char, std::char_traits<char> >(0),
       internalFileBuf_(), isRead(false) {
    
    this->init(&internalFileBuf_);
    isRead =  internalOpen(filename,  mode | std::ios_base::in, checkFilename);
  }
#endif  
  /**
   * virtual destructor will close the file(in single mode) and clear the stream buffer
   */
  ifstrstream::~ifstrstream(){
    close();
  }
  
  /**
   * Opens a file and associats a buffer with the specified file to perform the i/o operations 
   * (single mode). Master reads a file and brocasts its content to the other slave nodes. After
   * brocasting, every nodes fall back to stringstream (parallel mode).
   * @filename String containing the name of the file to be opened
   * @mode Flags describing the requested i/o mode for the file
   * @checkFilename Flags indicating checking the file name in parallel
   */
  void ifstrstream::open(const char* filename, std::ios_base::openmode mode, bool checkFilename){
    
    if (!isRead ) {
      isRead = internalOpen(filename, mode, checkFilename);
    }
  }

  /**
   * Tests if the stream is currently associated with a valid  buffer.
   * @return true if a file has successfully been opened (single mode) or the whole file is read 
   * and spreaded among all of the processors (parallel mode),  otherwise false is returned
   */
  bool ifstrstream::is_open ( ) {
#ifdef IS_MPI            
    return isRead; 
#else
    //single version fall back to ifstream
    return internalFileBuf_.is_open();
#endif
  }
  
  /**
   * In single mode, closes a file. The stream's file buffer is
   * released from its association with the currently open file. In
   * parallel mode, clean the
   */
  void ifstrstream::close() {
#ifndef IS_MPI            
    //single version fall back to ifstream
    if (!internalFileBuf_.close())
      this->setstate(std::ios_base::failbit);
#endif             
    
    isRead = false;
  }
  
  /**
   * Gets the stream buffer object associated with the stream
   * @return A pointer to the stream buffer object(filebuf in single
   * mode, stringbuf in parallel mode) associated with the stream.
   */
  std::basic_streambuf<char, std::char_traits<char> >*  ifstrstream::rdbuf() {
#ifdef IS_MPI
    return static_cast<_StringBuf*>(&internalStringBuf_); 
#else
    return static_cast<_FileBuf*>(&internalFileBuf_); 
#endif
  }  
  
  /**
     * Internal function used to open the file
     * @return true if succesfully opens a file (single mode) or gets the file content (parallel mode)
     * otherwise return false
     * @filename String containing the name of the file to be opened
     * @mode Flags describing the requested i/o mode for the file
     * @todo use try - catch syntax to make the program more readable
     */

  bool ifstrstream::internalOpen(const char* filename, std::ios_base::openmode mode, bool checkFilename){
    
#ifdef IS_MPI         
    //int commStatus;
    long fileSize;
    char* fbuf;
    int filenameLen;
    int diffFilename;
    int error;
    int myRank;
    int masterNode;
    
    myRank =  MPI::COMM_WORLD.Get_rank();
    masterNode = 0;
    
    if (myRank == masterNode) {
      
      if (checkFilename) {
        
        //check the filename is the same
        filenameLen = strlen(filename);
        MPI::COMM_WORLD.Bcast(&filenameLen, 1, MPI::INT, masterNode);
        MPI::COMM_WORLD.Bcast((void*)filename, filenameLen, MPI::CHAR, 
                              masterNode);
        
        diffFilename = 0;
        MPI::COMM_WORLD.Allreduce(&diffFilename, &error, 1, MPI::INT, MPI::SUM);

        //if file names are different just return false
        if (error > 0)
          return false;   
      }
      
      std::ifstream fin(filename, mode);
      
      if (fin.is_open()) {
        
        fin.seekg(0, std::ios::end); 
        fileSize = fin.tellg(); 
        fin.seekg(0, std::ios::beg);
        
        // '\0' need one more char
        fbuf = new char[fileSize+1];
        
        assert(fbuf != 0);
        
        fin.read(fbuf, fileSize);
        
        if (fin.fail())
          fileSize = FileIOError;
        
        //broadcast the file size
        MPI::COMM_WORLD.Bcast(&fileSize, 1, MPI::LONG, masterNode);
        
        if (fileSize < 0) {
          fin.close();                    
          delete fbuf;
          
          return false;
        }
        
        // make a c-style  std::string and broadcast it
        fbuf[fileSize] = '\0';
        MPI::COMM_WORLD.Bcast(fbuf, fileSize + 1, MPI::CHAR, masterNode);
        
        //close the file and delete the buffer
        fin.close();      
        internalStringBuf_.str(fbuf);
        delete [] fbuf;
      }else{
        fileSize = FileNotExists;
        MPI::COMM_WORLD.Bcast(&fileSize, 1, MPI::LONG, masterNode);
        return false;
      }
      
    } else{ //slave nodes
      
      //check file name
      if (checkFilename) {
        MPI::COMM_WORLD.Bcast(&filenameLen, 1, MPI::INT, masterNode);
        
        char * masterFilename = new char[filenameLen];
        MPI::COMM_WORLD.Bcast(masterFilename, filenameLen, MPI::CHAR, 
                              masterNode);
        
        if( strcmp(masterFilename, filename) == 0)
          diffFilename = 0;
        else
          diffFilename = 1;
        
        delete masterFilename;
        
        MPI::COMM_WORLD.Allreduce(&diffFilename, &error, 1, MPI::INT, MPI::SUM);
        
        if (error > 0)
          return false;                        
      }
      //get file size
      MPI::COMM_WORLD.Bcast(&fileSize, 1, MPI::LONG, masterNode);
      
      if (fileSize >= 0 ) {
        fbuf = new char[fileSize+1];
        assert(fbuf);
        
        //receive file content
        MPI::COMM_WORLD.Bcast(fbuf, fileSize + 1, MPI::CHAR, masterNode);
        
        internalStringBuf_.str(fbuf);
        delete [] fbuf;
        
      } else if (fileSize == FileNotExists ) {
        return false;
        
      } else if (fileSize == FileIOError ) {
        return false;
      }
    }
    
#else
    //in single version, fall back to ifstream
    if (!internalFileBuf_.open(filename, mode)) {
      this->setstate(std::ios_base::failbit);
      return false;
    }    
    
#endif
    this->clear();
    return true;
  }
}
Revision:	1798
Committed:	Thu Sep 13 14:10:11 2012 UTC (12 years, 7 months ago) by gezelter
File size:	9831 byte(s)
Log Message:	Merged trunk changes into the development branch
#	User	Rev	Content
1	gezelter	1627	/*
2			* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
3			*
4			* The University of Notre Dame grants you ("Licensee") a
5			* non-exclusive, royalty free, license to use, modify and
6			* redistribute this software in source and binary code form, provided
7			* that the following conditions are met:
8			*
9			* 1. Redistributions of source code must retain the above copyright
10			* notice, this list of conditions and the following disclaimer.
11			*
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the
15			* distribution.
16			*
17			* This software is provided "AS IS," without a warranty of any
18			* kind. All express or implied conditions, representations and
19			* warranties, including any implied warranty of merchantability,
20			* fitness for a particular purpose or non-infringement, are hereby
21			* excluded. The University of Notre Dame and its licensors shall not
22			* be liable for any damages suffered by licensee as a result of
23			* using, modifying or distributing the software or its
24			* derivatives. In no event will the University of Notre Dame or its
25			* licensors be liable for any lost revenue, profit or data, or for
26			* direct, indirect, special, consequential, incidental or punitive
27			* damages, however caused and regardless of the theory of liability,
28			* arising out of the use of or inability to use software, even if the
29			* University of Notre Dame has been advised of the possibility of
30			* such damages.
31			*
32			* SUPPORT OPEN SCIENCE! If you use OpenMD or its source code in your
33			* research, please cite the appropriate papers when you publish your
34			* work. Good starting points are:
35			*
36			* [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
37			* [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
38			* [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).
39	gezelter	1665	* [4] Kuang & Gezelter, J. Chem. Phys. 133, 164101 (2010).
40			* [5] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
41	gezelter	1627	*/
42
43			/**
44			* @file basic_ifstrstream.cpp
45			* @author Teng Lin
46			* @date 10/14/2004
47			* @version 1.0
48			*/
49
50			#include "io/ifstrstream.hpp"
51
52			#ifdef IS_MPI
53			#include <mpi.h>
54			#endif
55
56			namespace OpenMD {
57
58			/** Constructs an object of class ifstream. */
59			#ifdef IS_MPI
60			ifstrstream::ifstrstream()
61			: std::basic_istream<char, std::char_traits<char> >(0),
62			internalStringBuf_(), isRead(false) {
63			this->init(&internalStringBuf_);
64			}
65			#else
66			ifstrstream::ifstrstream()
67			: std::basic_istream<char, std::char_traits<char> >(0),
68			internalFileBuf_(), isRead(false) {
69			this->init(&internalFileBuf_);
70			}
71			#endif
72
73			/**
74			* Explicit constructor
75			* @filename String containing the name of the file to be opened
76			* @mode Flags describing the requested i/o mode for the file, default value is ios_base::in
77			* @checkFilename Flags indicating checking the file name in parallel
78			*/
79			#ifdef IS_MPI
80			ifstrstream::ifstrstream(const char* filename, std::ios_base::openmode mode, bool checkFilename)
81			: std::basic_istream<char, std::char_traits<char> >(0),
82			internalStringBuf_(), isRead(false) {
83			this->init(&internalStringBuf_);
84			isRead = internalOpen(filename, mode \| std::ios_base::in, checkFilename);
85			}
86			#else
87			ifstrstream::ifstrstream(const char* filename, std::ios_base::openmode mode, bool checkFilename)
88			: std::basic_istream<char, std::char_traits<char> >(0),
89			internalFileBuf_(), isRead(false) {
90
91			this->init(&internalFileBuf_);
92			isRead = internalOpen(filename, mode \| std::ios_base::in, checkFilename);
93			}
94			#endif
95			/**
96			* virtual destructor will close the file(in single mode) and clear the stream buffer
97			*/
98			ifstrstream::~ifstrstream(){
99			close();
100			}
101
102			/**
103			* Opens a file and associats a buffer with the specified file to perform the i/o operations
104			* (single mode). Master reads a file and brocasts its content to the other slave nodes. After
105			* brocasting, every nodes fall back to stringstream (parallel mode).
106			* @filename String containing the name of the file to be opened
107			* @mode Flags describing the requested i/o mode for the file
108			* @checkFilename Flags indicating checking the file name in parallel
109			*/
110			void ifstrstream::open(const char* filename, std::ios_base::openmode mode, bool checkFilename){
111
112			if (!isRead ) {
113			isRead = internalOpen(filename, mode, checkFilename);
114			}
115			}
116
117			/**
118			* Tests if the stream is currently associated with a valid buffer.
119			* @return true if a file has successfully been opened (single mode) or the whole file is read
120			* and spreaded among all of the processors (parallel mode), otherwise false is returned
121			*/
122			bool ifstrstream::is_open ( ) {
123			#ifdef IS_MPI
124			return isRead;
125			#else
126			//single version fall back to ifstream
127			return internalFileBuf_.is_open();
128			#endif
129			}
130
131			/**
132			* In single mode, closes a file. The stream's file buffer is
133			* released from its association with the currently open file. In
134			* parallel mode, clean the
135			*/
136			void ifstrstream::close() {
137			#ifndef IS_MPI
138			//single version fall back to ifstream
139			if (!internalFileBuf_.close())
140			this->setstate(std::ios_base::failbit);
141			#endif
142
143			isRead = false;
144			}
145
146			/**
147			* Gets the stream buffer object associated with the stream
148			* @return A pointer to the stream buffer object(filebuf in single
149			* mode, stringbuf in parallel mode) associated with the stream.
150			*/
151			std::basic_streambuf<char, std::char_traits<char> >* ifstrstream::rdbuf() {
152			#ifdef IS_MPI
153			return static_cast<_StringBuf*>(&internalStringBuf_);
154			#else
155			return static_cast<_FileBuf*>(&internalFileBuf_);
156			#endif
157			}
158
159			/**
160			* Internal function used to open the file
161			* @return true if succesfully opens a file (single mode) or gets the file content (parallel mode)
162			* otherwise return false
163			* @filename String containing the name of the file to be opened
164			* @mode Flags describing the requested i/o mode for the file
165			* @todo use try - catch syntax to make the program more readable
166			*/
167
168			bool ifstrstream::internalOpen(const char* filename, std::ios_base::openmode mode, bool checkFilename){
169
170			#ifdef IS_MPI
171	gezelter	1798	//int commStatus;
172	gezelter	1627	long fileSize;
173			char* fbuf;
174			int filenameLen;
175			int diffFilename;
176			int error;
177			int myRank;
178			int masterNode;
179
180	gezelter	1798	myRank = MPI::COMM_WORLD.Get_rank();
181	gezelter	1627	masterNode = 0;
182
183			if (myRank == masterNode) {
184
185			if (checkFilename) {
186
187			//check the filename is the same
188			filenameLen = strlen(filename);
189	gezelter	1798	MPI::COMM_WORLD.Bcast(&filenameLen, 1, MPI::INT, masterNode);
190			MPI::COMM_WORLD.Bcast((void*)filename, filenameLen, MPI::CHAR,
191			masterNode);
192	gezelter	1627
193			diffFilename = 0;
194	gezelter	1798	MPI::COMM_WORLD.Allreduce(&diffFilename, &error, 1, MPI::INT, MPI::SUM);
195
196	gezelter	1627	//if file names are different just return false
197			if (error > 0)
198			return false;
199			}
200
201			std::ifstream fin(filename, mode);
202
203			if (fin.is_open()) {
204
205			fin.seekg(0, std::ios::end);
206			fileSize = fin.tellg();
207			fin.seekg(0, std::ios::beg);
208
209			// '\0' need one more char
210			fbuf = new char[fileSize+1];
211
212			assert(fbuf != 0);
213
214			fin.read(fbuf, fileSize);
215
216			if (fin.fail())
217			fileSize = FileIOError;
218
219	gezelter	1798	//broadcast the file size
220			MPI::COMM_WORLD.Bcast(&fileSize, 1, MPI::LONG, masterNode);
221	gezelter	1627
222			if (fileSize < 0) {
223			fin.close();
224			delete fbuf;
225
226			return false;
227			}
228
229	gezelter	1798	// make a c-style std::string and broadcast it
230	gezelter	1627	fbuf[fileSize] = '\0';
231	gezelter	1798	MPI::COMM_WORLD.Bcast(fbuf, fileSize + 1, MPI::CHAR, masterNode);
232	gezelter	1627
233			//close the file and delete the buffer
234			fin.close();
235			internalStringBuf_.str(fbuf);
236			delete [] fbuf;
237			}else{
238			fileSize = FileNotExists;
239	gezelter	1798	MPI::COMM_WORLD.Bcast(&fileSize, 1, MPI::LONG, masterNode);
240	gezelter	1627	return false;
241			}
242
243			} else{ //slave nodes
244
245			//check file name
246			if (checkFilename) {
247	gezelter	1798	MPI::COMM_WORLD.Bcast(&filenameLen, 1, MPI::INT, masterNode);
248	gezelter	1627
249			char * masterFilename = new char[filenameLen];
250	gezelter	1798	MPI::COMM_WORLD.Bcast(masterFilename, filenameLen, MPI::CHAR,
251			masterNode);
252	gezelter	1627
253			if( strcmp(masterFilename, filename) == 0)
254			diffFilename = 0;
255			else
256			diffFilename = 1;
257
258			delete masterFilename;
259
260	gezelter	1798	MPI::COMM_WORLD.Allreduce(&diffFilename, &error, 1, MPI::INT, MPI::SUM);
261	gezelter	1627
262			if (error > 0)
263			return false;
264			}
265			//get file size
266	gezelter	1798	MPI::COMM_WORLD.Bcast(&fileSize, 1, MPI::LONG, masterNode);
267	gezelter	1627
268			if (fileSize >= 0 ) {
269			fbuf = new char[fileSize+1];
270			assert(fbuf);
271
272			//receive file content
273	gezelter	1798	MPI::COMM_WORLD.Bcast(fbuf, fileSize + 1, MPI::CHAR, masterNode);
274	gezelter	1627
275			internalStringBuf_.str(fbuf);
276			delete [] fbuf;
277
278			} else if (fileSize == FileNotExists ) {
279			return false;
280
281			} else if (fileSize == FileIOError ) {
282			return false;
283			}
284			}
285
286			#else
287			//in single version, fall back to ifstream
288			if (!internalFileBuf_.open(filename, mode)) {
289			this->setstate(std::ios_base::failbit);
290			return false;
291			}
292
293			#endif
294			this->clear();
295			return true;
296			}
297			}