1 | #include "stopos_pool.h" |
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2 | #include "stopos.h" |
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3 | #include "wutils.h" |
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4 | #include <iostream> |
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5 | #include <string.h> |
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6 | #include <stdlib.h> |
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7 | int stopos_pool::get_status(void) |
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8 | // non-sense example implementation, you have to overwrite this in a derived class |
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9 | { |
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10 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::getstatus must be overwritten in a derived class"<<std::endl; |
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11 | this->status.next = this->statuskey; |
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12 | this->status.first = this->statuskey; |
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13 | this->status.last = this->statuskey; |
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14 | this->status.count = StringToNumber<longuint>(0); |
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15 | return NOTIMPLEMENTED; |
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16 | } |
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17 | #if 0 |
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18 | int stopos_pool::put_status(void) |
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19 | // non-sense example implementation, you have to overwrite this in a derived class |
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20 | { |
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21 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::putstatus must be overwritten in a derived class"<<std::endl; |
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22 | std::cout << this->status.next.str(); |
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23 | std::cout << this->status.first.str(); |
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24 | std::cout << this->status.last.str(); |
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25 | std::cout << this->status.count; |
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26 | return NOTIMPLEMENTED; |
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27 | } |
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28 | #endif |
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29 | |
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30 | int stopos_pool::get_record(std::string &r, const std::string &k) |
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31 | // non-sense example implementation, you have to overwrite this in a derived class |
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32 | { |
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33 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::get_record must be overwritten in a derived class"<<std::endl; |
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34 | return 0; |
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35 | } |
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36 | |
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37 | int stopos_pool::put_record(const std::string &r, const std::string &k) |
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38 | // non-sense example implementation, you have to overwrite this in a derived class |
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39 | { |
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40 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::put_record must be overwritten in a derived class"<<std::endl; |
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41 | std::cout <<r<<std::endl; |
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42 | return 0; |
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43 | // |
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44 | // record r must be stored such that get_record() retrieves it using k |
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45 | // |
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46 | } |
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47 | |
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48 | int stopos_pool::remove_record(const stopos_key &k) |
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49 | // non-sense example implementation, you have to overwrite this in a derived class |
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50 | { |
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51 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::remove_record must be overwritten in a derived class"<<std::endl; |
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52 | std::cout << "Please forget the existence of the record with the following key:"<<k.str()<<std::endl; |
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53 | return 0; |
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54 | } |
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55 | |
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56 | int stopos_pool::create_db(void) |
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57 | // non-sense example implementation, you have to overwrite this in a derived class |
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58 | { |
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59 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::create_db must be overwritten in a derived class"<<std::endl; |
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60 | std::cout << "Please create file " << this->db_name<< std::endl; |
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61 | return 0; |
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62 | } |
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63 | |
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64 | int stopos_pool::purge_db(void) |
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65 | // non-sense example implementation, you have to overwrite this in a derived class |
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66 | { |
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67 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::purge_db must be overwritten in a derived class"<<std::endl; |
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68 | std::cout << "Please purge file " << this->db_name<< std::endl; |
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69 | return 0; |
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70 | } |
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71 | |
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72 | int stopos_pool::open_db(void) |
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73 | // non-sense example implementation, you have to overwrite this in a derived class |
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74 | { |
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75 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::open_db must be overwritten in a derived class"<<std::endl; |
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76 | std::cout << "Please open file " << this->db_name<<" and assign the result to an handle in your class" << std::endl; |
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77 | |
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78 | this->db_open = 1; |
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79 | return 0; |
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80 | } |
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81 | |
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82 | int stopos_pool::close_db(void) |
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83 | // non-sense example implementation, you have to overwrite this in a derived class |
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84 | { |
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85 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::close_db must be overwritten in a derived class"<<std::endl; |
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86 | std::cout << "Please close file " << this->db_name<<std::endl; |
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87 | |
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88 | db_open = 0; |
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89 | return 0; |
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90 | } |
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91 | |
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92 | void stopos_pool::dump_db(void) |
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93 | // non-sense example implementation, you have to overwrite this in a derived class |
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94 | { |
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95 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::dump_db must be overwritten in a derived class"<<std::endl; |
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96 | std::cout << "Please dump file " << this->db_name<<std::endl; |
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97 | } |
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98 | |
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99 | // constructor: |
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100 | stopos_pool::stopos_pool() |
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101 | { |
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102 | this->kvp = 0; |
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103 | this->statuskey = stopos_key(); // full key |
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104 | this->db_name = 0; |
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105 | this->db_open = 0; |
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106 | } |
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107 | |
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108 | // destructor |
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109 | stopos_pool::~stopos_pool() |
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110 | { |
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111 | if(db_name) |
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112 | free (db_name); |
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113 | } |
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114 | |
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115 | int stopos_pool::get_record(datarecord &r,const stopos_key &k) |
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116 | { |
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117 | std::string s; |
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118 | int rc; |
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119 | rc = this->get_record(s, k.str()); // wwvv full key |
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120 | if (rc != 0) |
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121 | return rc; |
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122 | r = datarecord(s,dbsep); |
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123 | return 0; |
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124 | } |
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125 | |
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126 | int stopos_pool::put_record(const datarecord &r,const stopos_key &k) |
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127 | { |
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128 | std::string b; |
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129 | int rc; |
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130 | |
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131 | b = r.str(dbsep); |
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132 | |
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133 | rc = this->put_record(b,k.str()); // wwvv full key |
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134 | |
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135 | return rc; |
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136 | } |
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137 | |
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138 | void stopos_pool::set_db_name(std::string filename) |
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139 | { |
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140 | this->sdb_name = filename; |
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141 | this->db_name = strdup(filename.c_str()); |
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142 | } |
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143 | |
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144 | std::string stopos_pool::get_db_name(void) |
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145 | { |
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146 | return this->sdb_name; |
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147 | } |
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148 | |
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149 | int stopos_pool::add_line(const std::string line, std::string &key) |
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150 | { |
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151 | if (!this->db_open) |
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152 | return DBNOTOPEN; |
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153 | |
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154 | datarecord d; |
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155 | stopos_key dkey; |
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156 | int rc; |
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157 | rc = get_status(); |
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158 | if (rc != 0) |
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159 | return rc; |
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160 | |
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161 | //dkey is the key of the inserted record |
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162 | //dkey = status.last; // wwvv full key |
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163 | dkey.set(status.count + 1,this->get_slot(dkey.get_key())); |
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164 | dkey.set(status.count + 1,this->get_slot(stopos_key::NumberToKey(status.count +1))); |
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165 | |
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166 | // if status.last != 0, modify 'next' of last record |
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167 | if (status.last != this->statuskey) |
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168 | { |
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169 | datarecord l; |
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170 | rc = this->get_record(l,this->status.last); |
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171 | if (rc != 0) |
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172 | return rc; |
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173 | l.next = dkey; // wwvv full key |
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174 | rc = this->put_record(l,this->status.last); |
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175 | if (rc !=0) |
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176 | return rc; |
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177 | } |
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178 | |
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179 | // if status.next points to nothing |
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180 | // or |
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181 | // if status.next points to a record that has been committed, |
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182 | // then |
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183 | // status.next should point to the record just added |
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184 | |
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185 | // modify status record |
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186 | |
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187 | if (this->status.next == this->statuskey) // status.next points to nothing |
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188 | this->status.next = dkey; // wwvv comp: value, dkey full key |
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189 | else // look if status.next points to a record that has already been committed |
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190 | { |
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191 | datarecord r; |
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192 | int rc; |
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193 | |
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194 | rc = this->get_record(r,this->status.next); |
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195 | if (rc != 0) |
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196 | return FETCHERROR; |
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197 | |
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198 | if (r.retrieved != 0) |
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199 | this->status.next = dkey; // wwvv full key |
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200 | } |
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201 | |
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202 | if (this->status.first == this->statuskey) |
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203 | this->status.first = dkey; // wwvv full key |
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204 | |
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205 | d.prev = status.last; |
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206 | this->status.last = dkey; // wwvv full key |
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207 | |
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208 | this->status.count++; |
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209 | this->status.present++; |
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210 | this->status.present0++; |
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211 | |
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212 | rc = this->put_status(); |
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213 | if (rc != 0) |
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214 | return this->STOREERROR; |
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215 | |
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216 | d.value = zstrtohex(line); |
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217 | d.next = this->statuskey; |
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218 | d.retrieved = 0; |
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219 | |
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220 | rc = put_record(d,dkey); // wwvv full key |
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221 | |
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222 | if (rc != 0) |
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223 | return this->STOREERROR; |
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224 | |
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225 | key = dkey.str(); // wwvv full key |
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226 | return 0; |
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227 | } |
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228 | |
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229 | int stopos_pool::get_line(std::string &line, longuint &retrieved, std::string &key) |
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230 | { |
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231 | if (!this->db_open) |
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232 | return DBNOTOPEN; |
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233 | |
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234 | int rc; |
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235 | rc = this->get_status(); |
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236 | if (rc != 0) |
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237 | return FETCHERROR; |
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238 | |
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239 | if (this->status.next == this->statuskey) // wwvv value |
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240 | { |
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241 | if (!this->kvp) |
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242 | return NOTFOUND; |
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243 | // wrapping around ... |
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244 | status.next = status.first; |
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245 | |
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246 | if (this->status.next == this->statuskey) // wwvv value |
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247 | return NOTFOUND; |
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248 | } |
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249 | |
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250 | datarecord r; |
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251 | |
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252 | rc = this->get_record(r,this->status.next); |
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253 | if (rc != 0) |
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254 | return FETCHERROR; |
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255 | |
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256 | retrieved = r.retrieved; |
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257 | if (!this->kvp) |
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258 | if (r.retrieved !=0) |
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259 | return NOTFOUND; |
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260 | key = this->status.next.str(); // wwvv full key |
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261 | |
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262 | line = zhextostr(r.value); |
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263 | |
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264 | // adjust the 'retrieved' field of r, and write it |
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265 | |
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266 | r.retrieved++; |
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267 | |
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268 | rc = this->put_record(r,status.next); |
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269 | if (rc != 0) |
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270 | return STOREERROR; |
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271 | |
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272 | // adjust the 'next' field of status. this must be equal |
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273 | // to the 'next' field of r |
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274 | |
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275 | this->status.next = r.next; |
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276 | |
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277 | if (r.retrieved == 1) |
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278 | this->status.present0--; |
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279 | |
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280 | this->put_status(); |
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281 | |
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282 | return 0; |
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283 | } |
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284 | |
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285 | int stopos_pool::remove_line(const std::string &k) |
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286 | { |
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287 | if (!this->db_open) |
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288 | return DBNOTOPEN; |
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289 | |
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290 | int rc; |
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291 | datarecord r; |
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292 | stopos_key key(k); |
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293 | |
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294 | rc = this->get_record(r,key); |
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295 | if (rc !=0) |
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296 | return rc; |
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297 | |
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298 | // remove this record from the linked lists. |
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299 | |
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300 | rc=this->get_status(); |
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301 | if (rc != 0) |
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302 | return rc; |
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303 | |
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304 | // |
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305 | //remove_line |
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306 | |
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307 | // r = record to remove |
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308 | // |
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309 | // situations we have to deal with: |
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310 | // |
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311 | // r.next = 0 ( = key to status) |
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312 | // r.next = data ( = key to data) |
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313 | // |
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314 | // r.prev = 0 |
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315 | // r.prev = data |
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316 | // |
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317 | // if (r.prev != 0) |
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318 | // get p(r.prev) |
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319 | // |
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320 | // if (r.next != 0) |
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321 | // get n(r.next) |
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322 | // |
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323 | // if (r.next = 0) //r is last record |
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324 | // { |
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325 | // if r.prev = data |
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326 | // { |
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327 | // p.next = r.next (=0) |
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328 | // if (key == s.next) |
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329 | // s.next = r.next ( = 0) |
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330 | // if (key == s.last) // must be true, r is last record |
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331 | // s.last = r.prev |
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332 | // if (key == s.first) |
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333 | // impossible, because there is a previous record |
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334 | // } |
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335 | // else // r.prev = 0 // this is the only record |
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336 | // { |
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337 | // s.next = r.next ( =r.prev =0) |
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338 | // s.first = r.prev ( = r.next =0) |
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339 | // s.last = r.prev ( = r.next = 0) |
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340 | // } |
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341 | // } |
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342 | // else // r has a follower |
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343 | // { |
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344 | // if r.prev = datarecord |
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345 | // { |
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346 | // p.next = r.next |
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347 | // n.prev = r.prev |
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348 | // if (key == s.next) |
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349 | // s.next = r.next |
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350 | // if (key == s.last) |
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351 | // impossible, there is a follower |
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352 | // if (key == s.first) |
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353 | // impossible, there is a predecessor |
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354 | // } |
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355 | // else // r.prev = 0: r is the first record |
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356 | // { |
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357 | // n.prev = r.prev (=0) |
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358 | // if (key == s.next) |
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359 | // s.next = r.next |
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360 | // if (key == s.last) |
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361 | // impossible, there is a follower |
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362 | // if (key == s.first) // must be |
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363 | // s.first = r.next |
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364 | // } |
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365 | // } |
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366 | |
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367 | // remove record r |
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368 | // |
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369 | |
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370 | this->get_record(r,key); |
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371 | // |
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372 | // situations we have to deal with: |
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373 | // |
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374 | // r.next = 0 ( = key to status) |
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375 | // r.next = data ( = key to data) |
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376 | // |
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377 | // r.prev = 0 |
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378 | // r.prev = data |
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379 | // |
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380 | |
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381 | datarecord p,n; |
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382 | |
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383 | if (r.prev != this->statuskey) // wwvv value |
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384 | this->get_record(p,r.prev); |
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385 | |
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386 | if (r.next != this->statuskey) // wwvv value |
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387 | this->get_record(n,r.next); |
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388 | // |
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389 | // and what to do if the next record to be dumped is |
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390 | // exactly this record? |
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391 | // |
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392 | // I think, status.nextd should become r.next, |
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393 | // whatever r.next is pointing to |
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394 | // However, if r.next is pointing to nothing, |
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395 | // we should give status.nextd an impossible value |
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396 | // |
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397 | |
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398 | if (this->status.nextd == key) // wwvv value |
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399 | { |
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400 | if (r.next == this->statuskey) // wwvv value |
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401 | this->status.nextd.impossible(); |
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402 | else |
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403 | this->status.nextd = r.next; |
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404 | } |
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405 | |
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406 | if (r.next == this->statuskey) // r is last record |
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407 | { |
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408 | if (r.prev != this->statuskey) // r is last record and has a predecessor |
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409 | { |
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410 | p.next = r.next; |
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411 | this->put_record(p,r.prev); |
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412 | |
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413 | if (key == status.next) |
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414 | status.next = r.next; |
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415 | |
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416 | // if (key == status.last) // always the case here |
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417 | status.last = r.prev; |
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418 | |
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419 | // if (key == status.first) |
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420 | // impossible, because there is a previous record |
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421 | } |
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422 | else // r is the only record |
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423 | { |
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424 | status.next = r.next; |
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425 | status.first = r.prev; |
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426 | status.last = r.prev; |
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427 | } |
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428 | } |
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429 | else // r has a follower |
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430 | { |
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431 | if (r.prev != this->statuskey) // r has a predecessor and a follower |
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432 | { |
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433 | p.next = r.next; |
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434 | this->put_record(p,r.prev); |
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435 | |
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436 | n.prev = r.prev; |
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437 | this->put_record(n,r.next); |
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438 | |
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439 | if (key == status.next) |
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440 | status.next = r.next; |
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441 | // if (key == status.last) |
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442 | // impossible, r has a follower |
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443 | // if (key == s.first) |
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444 | // impossible, r has a predecessor |
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445 | } |
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446 | else // r is first record and has a follower |
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447 | { |
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448 | n.prev = r.prev; |
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449 | this->put_record(n,r.next); |
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450 | |
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451 | if (key == status.next) |
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452 | status.next = r.next; |
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453 | |
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454 | // if (key == status.last) |
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455 | // impossible, r has a follower |
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456 | |
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457 | // if (key == status.first) // always true here |
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458 | status.first = r.next; |
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459 | } |
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460 | } |
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461 | |
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462 | // finally, remove the record |
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463 | |
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464 | |
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465 | rc = this->remove_record(key); |
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466 | if (rc != 0) |
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467 | return rc; |
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468 | |
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469 | // and rewrite status |
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470 | |
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471 | this->status.present--; |
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472 | if (r.retrieved == 0) |
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473 | this->status.present0--; |
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474 | |
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475 | rc = this->put_status(); |
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476 | if (rc != 0) |
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477 | return rc; |
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478 | |
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479 | return 0; |
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480 | } |
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481 | |
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482 | void stopos_pool::set_kvp(bool v) |
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483 | { |
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484 | this->kvp = v; |
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485 | } |
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486 | |
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487 | bool stopos_pool::get_kvp(void) |
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488 | { |
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489 | return this->kvp; |
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490 | } |
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491 | |
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492 | int stopos_pool::get_counts(longuint &count, |
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493 | longuint &present, |
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494 | longuint &present0) |
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495 | { |
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496 | int rc = get_status(); |
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497 | if (rc != 0) |
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498 | return rc; |
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499 | |
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500 | count = status.count; |
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501 | present = status.present; |
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502 | present0 = status.present0; |
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503 | return 0; |
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504 | } |
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505 | |
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506 | int stopos_pool::dump_line(std::string &line, |
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507 | longuint &retrieved, |
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508 | std::string &key) |
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509 | { |
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510 | if (!this->db_open) |
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511 | return DBNOTOPEN; |
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512 | |
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513 | int rc; |
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514 | rc = this->get_status(); |
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515 | if (rc != 0) |
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516 | return FETCHERROR; |
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517 | |
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518 | // |
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519 | // if status.nextd is pointing to nothing, |
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520 | // we assume that one is starting the dump, |
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521 | // and let nextd point to the first record |
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522 | // |
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523 | |
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524 | if (this->status.nextd == this->statuskey) |
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525 | this->status.nextd = this->status.first; |
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526 | |
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527 | datarecord r; |
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528 | |
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529 | rc = this->get_record(r,this->status.nextd); |
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530 | if (rc != 0) |
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531 | { |
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532 | this->status.nextd = this->status.first; |
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533 | this->put_status(); |
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534 | return NOTFOUND; |
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535 | } |
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536 | |
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537 | key = this->status.nextd.str(); // full key |
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538 | |
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539 | line = zhextostr(r.value); |
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540 | |
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541 | this->status.nextd = r.next; |
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542 | |
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543 | if (this->status.nextd == this->statuskey) // we signal that we reached eoi |
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544 | this->status.nextd.impossible(); // at the next call |
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545 | |
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546 | this->put_status(); |
---|
547 | |
---|
548 | return 0; |
---|
549 | } |
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550 | |
---|
551 | datarecord::datarecord() |
---|
552 | { |
---|
553 | this->retrieved = 0; |
---|
554 | } |
---|
555 | |
---|
556 | datarecord::datarecord(const std::string &s,char sep) |
---|
557 | { |
---|
558 | std::vector <std::string> v; |
---|
559 | split(v,s,sep); |
---|
560 | |
---|
561 | this->prev = stopos_key(v[0]); |
---|
562 | this->next = stopos_key(v[1]); |
---|
563 | this->retrieved = StringToNumber<longuint>(v[2]); |
---|
564 | this->value = v[3]; |
---|
565 | } |
---|
566 | |
---|
567 | std::string datarecord::str(char sep) const |
---|
568 | { |
---|
569 | std::string r; |
---|
570 | r = this->prev.str() + sep // wwvv full key |
---|
571 | + this->next.str() + sep // wwvv full key |
---|
572 | + NumberToString(this->retrieved) + sep |
---|
573 | + this->value |
---|
574 | ; |
---|
575 | |
---|
576 | return r; |
---|
577 | } |
---|
578 | |
---|
579 | statusrecord::statusrecord(void) |
---|
580 | { |
---|
581 | this->init(); |
---|
582 | } |
---|
583 | |
---|
584 | statusrecord::statusrecord(const std::string & s, char sep) |
---|
585 | { |
---|
586 | std:: vector <std::string> v; |
---|
587 | |
---|
588 | split(v,s,sep); |
---|
589 | this->next = stopos_key(v[0]); |
---|
590 | this->first = stopos_key(v[1]); |
---|
591 | this->last = stopos_key(v[2]); |
---|
592 | this->nextd = stopos_key(v[3]); |
---|
593 | this->count = StringToNumber<longuint>(v[4]); |
---|
594 | this->present = StringToNumber<longuint>(v[5]); |
---|
595 | this->present0 = StringToNumber<longuint>(v[6]); |
---|
596 | |
---|
597 | } |
---|
598 | void statusrecord::init(void) |
---|
599 | { |
---|
600 | this->next = stopos_key(); |
---|
601 | this->first = stopos_key(); |
---|
602 | this->last = stopos_key(); |
---|
603 | this->nextd = stopos_key(); |
---|
604 | this->count = 0; |
---|
605 | this->present = 0; |
---|
606 | this->present0 = 0; |
---|
607 | } |
---|
608 | |
---|
609 | std::string statusrecord::str(char sep) |
---|
610 | { |
---|
611 | std::string r; |
---|
612 | r = this->next.str() + sep // wwvv full key |
---|
613 | + this->first.str() + sep // wwvv full key |
---|
614 | + this->last.str() + sep // wwvv full key |
---|
615 | + this->nextd.str() + sep // wwvv full key |
---|
616 | + NumberToString(this->count) + sep |
---|
617 | + NumberToString(this->present) + sep |
---|
618 | + NumberToString(this->present0) |
---|
619 | ; |
---|
620 | return r; |
---|
621 | } |
---|
622 | |
---|