NCCLOUD  0.1
fileop.h
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00001 
00007 /* ===================================================================
00008 Copyright (c) 2013, Henry C. H. Chen
00009 All rights reserved.
00010 
00011 Redistribution and use in source and binary forms, with or without
00012 modification, are permitted provided that the following conditions are
00013 met:
00014 
00015   - Redistributions of source code must retain the above copyright
00016     notice, this list of conditions and the following disclaimer.
00017 
00018   - Redistributions in binary form must reproduce the above copyright
00019     notice, this list of conditions and the following disclaimer in
00020     the documentation and/or other materials provided with the
00021     distribution.
00022 
00023   - Neither the name of the Chinese University of Hong Kong nor the
00024     names of its contributors may be used to endorse or promote
00025     products derived from this software without specific prior written
00026     permission.
00027 
00028 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00029 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00030 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00031 A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
00032 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00033 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00034 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00035 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00036 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00037 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00038 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00039 =================================================================== */
00040 
00041 
00042 #ifndef NCCLOUD_FILEOP_H
00043 #define NCCLOUD_FILEOP_H
00044 
00045 #include <string>
00046 #include <thread>
00047 #include <vector>
00048 
00049 #include "coding.h"
00050 #include "common.h"
00051 #include "storage.h"
00052 
00053 
00056 class Job
00057 {
00058   /* Storage job routines. */
00059   void upload_metadata_and_chunks(void);
00060   void upload_metadata(void);
00061   void download_chunks(void);
00062   void download_metadata(void);
00063 
00064   /* Coding job routines. */
00065   void decode_file(void);
00066   void repair_file(void);
00067 
00068 public:
00070   enum ACTIONS { ULMETACHUNKS, ULMETA, DLCHUNKS, DLMETA,
00071                  DIVIDER, DECODE, REPAIR };
00072 
00073   int action;  
00074   Coding *coding;  
00075   std::vector<Storage *> *storages;  
00076   std::string tmpdir;  
00077   std::string filename;  
00078   std::vector<int> chunk_indices;  
00079   std::vector<int> node_indices;   
00080   Job *next_job;  
00083   Job(int action, Coding *coding, std::vector<Storage *> *storages,
00084       std::string &tmpdir, std::string &filename);
00085 
00086 
00088   void follow_job(void);
00089 
00090 
00092   void run_job(void);
00093 };
00094 
00095 
00097 class FileOp
00098 {
00100   std::vector<std::thread> workers;
00101 
00102   FileOp();
00103 
00104 public:
00106   static FileOp *instance(void);
00107 
00108 
00110   void wait(void);
00111 
00112 
00118   void encode_file(std::string &path, Coding *coding,
00119                    std::vector<Storage *> &storages, std::string &tmpdir);
00120 
00121 
00127   void decode_file(std::string &filename, Coding *coding,
00128                    std::vector<Storage *> &storages, std::string &tmpdir);
00129 
00130 
00138   void repair_file(std::string &filename, Coding *coding,
00139                    std::vector<Storage *> &storages,
00140                    std::vector<int> &chunks_to_retrieve,
00141                    int faulty_node, std::string &tmpdir);
00142 
00143 
00148   void delete_file(std::string &filename, Coding *coding,
00149                    std::vector<Storage *> &storages);
00150 };
00151 
00152 #endif  /* NCCLOUD_FILEOP_H */
00153 
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