[9] | 1 | |
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| 2 | /* |
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| 3 | Copyright 2013 Willem Vermin, SURFsara |
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| 4 | |
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| 5 | Licensed under the Apache License, Version 2.0 (the "License"); |
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| 6 | you may not use this file except in compliance with the License. |
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| 7 | You may obtain a copy of the License at |
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| 8 | |
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| 9 | http://www.apache.org/licenses/LICENSE-2.0 |
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| 10 | |
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| 11 | Unless required by applicable law or agreed to in writing, software |
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| 12 | distributed under the License is distributed on an "AS IS" BASIS, |
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| 13 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 14 | See the License for the specific language governing permissions and |
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| 15 | limitations under the License. |
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| 16 | */ |
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| 17 | #include "stopos_pool.h" |
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| 18 | #include "stopos.h" |
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| 19 | #include "wutils.h" |
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| 20 | #include <iostream> |
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| 21 | #include <string.h> |
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| 22 | #include <stdlib.h> |
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| 23 | |
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| 24 | int stopos_pool::get_record(std::string &r, const std::string &k, const std::string &l) |
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| 25 | // non-sense example implementation, you have to overwrite this in a derived class |
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| 26 | { |
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| 27 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::get_record must be overwritten in a derived class"<<std::endl; |
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| 28 | return 0; |
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| 29 | } |
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| 30 | |
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| 31 | int stopos_pool::put_record(const std::string &r, const std::string &k,const std::string &l) |
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| 32 | // non-sense example implementation, you have to overwrite this in a derived class |
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| 33 | { |
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| 34 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::put_record must be overwritten in a derived class"<<std::endl; |
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| 35 | std::cout <<r<<std::endl; |
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| 36 | return 0; |
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| 37 | // |
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| 38 | // record r must be stored such that get_record() retrieves it using k |
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| 39 | // |
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| 40 | } |
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| 41 | |
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| 42 | int stopos_pool::remove_record(const std::string &k, const std::string &l) |
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| 43 | // non-sense example implementation, you have to overwrite this in a derived class |
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| 44 | { |
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| 45 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::remove_record must be overwritten in a derived class"<<std::endl; |
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| 46 | std::cout << "Please forget the existence of the record with the following key:"<<k<<std::endl; |
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| 47 | return 0; |
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| 48 | } |
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| 49 | |
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| 50 | int stopos_pool::create_db(const std::string &db) |
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| 51 | // non-sense example implementation, you have to overwrite this in a derived class |
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| 52 | { |
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| 53 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::create_db must be overwritten in a derived class"<<std::endl; |
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| 54 | std::cout << "Please create file " << db<< std::endl; |
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| 55 | return 0; |
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| 56 | } |
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| 57 | |
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| 58 | int stopos_pool::purge_db(void) |
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| 59 | // non-sense example implementation, you have to overwrite this in a derived class |
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| 60 | { |
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| 61 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::purge_db must be overwritten in a derived class"<<std::endl; |
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| 62 | std::cout << "Please purge file " << this->db_name<< std::endl; |
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| 63 | return 0; |
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| 64 | } |
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| 65 | |
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| 66 | int stopos_pool::open_db(void) |
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| 67 | // non-sense example implementation, you have to overwrite this in a derived class |
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| 68 | { |
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| 69 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::open_db must be overwritten in a derived class"<<std::endl; |
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| 70 | std::cout << "Please open file " << this->db_name<<" and assign the result to an handle in your class" << std::endl; |
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| 71 | |
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| 72 | this->db_open = 1; |
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| 73 | return 0; |
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| 74 | } |
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| 75 | |
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| 76 | int stopos_pool::close_db(void) |
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| 77 | // non-sense example implementation, you have to overwrite this in a derived class |
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| 78 | { |
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| 79 | std::cerr << __FILE__<<":"<<__LINE__<<"stopos_pool::close_db must be overwritten in a derived class"<<std::endl; |
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| 80 | std::cout << "Please close file " << this->db_name<<std::endl; |
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| 81 | |
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| 82 | db_open = 0; |
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| 83 | return 0; |
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| 84 | } |
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| 85 | |
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| 86 | // constructor: |
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| 87 | stopos_pool::stopos_pool() |
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| 88 | { |
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| 89 | this->kvp = 0; |
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| 90 | this->statuskey = stopos_key(); // full key |
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| 91 | this->db_name = 0; |
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| 92 | this->db_open = 0; |
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| 93 | } |
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| 94 | |
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| 95 | // destructor |
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| 96 | stopos_pool::~stopos_pool() |
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| 97 | { |
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| 98 | if(db_name) |
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| 99 | free (db_name); |
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| 100 | } |
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| 101 | |
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| 102 | int stopos_pool::create_db(void) |
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| 103 | { |
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| 104 | int rc; |
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| 105 | rc = this->create_db(this->sdb_name); |
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| 106 | if(rc != 0) |
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| 107 | return rc; |
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| 108 | |
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| 109 | this->status.init(); |
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| 110 | rc = this->open_db(); |
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| 111 | if (rc != 0) |
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| 112 | return rc; |
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| 113 | rc = this->put_status(); |
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| 114 | this->close_db(); |
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| 115 | return rc; |
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| 116 | } |
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| 117 | |
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| 118 | int stopos_pool::get_record(datarecord &r, |
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| 119 | const stopos_key &k) |
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| 120 | { |
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| 121 | std::string s; |
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| 122 | int rc; |
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| 123 | rc = this->get_record(s, k.get_key(),k.get_slot()); |
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| 124 | if (rc != 0) |
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| 125 | return rc; |
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| 126 | r = datarecord(s,dbsep); |
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| 127 | return 0; |
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| 128 | } |
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| 129 | |
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| 130 | int stopos_pool::put_record(const datarecord &r, |
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| 131 | const stopos_key &k) |
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| 132 | { |
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| 133 | std::string b; |
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| 134 | int rc; |
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| 135 | |
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| 136 | b = r.str(dbsep); |
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| 137 | |
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| 138 | rc = this->put_record(b,k.get_key(),k.get_slot()); |
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| 139 | |
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| 140 | return rc; |
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| 141 | } |
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| 142 | |
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| 143 | int stopos_pool::remove_record(const stopos_key &k) |
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| 144 | { |
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| 145 | return this->remove_record(k.get_key(),k.get_slot()); |
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| 146 | } |
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| 147 | |
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| 148 | void stopos_pool::set_db_name(std::string filename) |
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| 149 | { |
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| 150 | this->sdb_name = filename; |
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| 151 | this->db_name = strdup(filename.c_str()); |
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| 152 | } |
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| 153 | |
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| 154 | std::string stopos_pool::get_db_name(void) |
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| 155 | { |
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| 156 | return this->sdb_name; |
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| 157 | } |
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| 158 | |
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| 159 | int stopos_pool::put_status(void) |
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| 160 | { |
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| 161 | std::string buf; |
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| 162 | buf = this->status.str(dbsep); |
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| 163 | |
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| 164 | return this->put_record(buf,this->statuskey.get_key(),this->statuskey.get_slot()); |
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| 165 | } |
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| 166 | |
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| 167 | int stopos_pool::get_status(void) |
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| 168 | { |
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| 169 | std::string buf; |
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| 170 | int rc =this->get_record(buf,this->statuskey.get_key(),this->statuskey.get_slot()); |
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| 171 | if (rc != 0) |
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| 172 | return rc; |
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| 173 | |
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| 174 | this->status = statusrecord(buf,dbsep); |
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| 175 | return 0; |
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| 176 | } |
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| 177 | |
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| 178 | int stopos_pool::add_line(const std::string line, |
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| 179 | std::string &key) |
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| 180 | { |
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| 181 | if (!this->db_open) |
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| 182 | return DBNOTOPEN; |
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| 183 | |
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| 184 | datarecord d; |
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| 185 | stopos_key dkey; |
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| 186 | int rc; |
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| 187 | rc = get_status(); |
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| 188 | if (rc != 0) |
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| 189 | return rc; |
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| 190 | |
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| 191 | //dkey is the key of the inserted record |
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| 192 | //dkey = status.last; |
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| 193 | std::string slot = this->key_to_slot(stopos_key::NumberToKey(status.count +1)); |
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| 194 | dkey.set(status.count + 1,slot); |
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| 195 | |
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| 196 | // if status.last != 0, modify 'next' of last record |
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| 197 | if (status.last != this->statuskey) |
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| 198 | { |
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| 199 | datarecord l; |
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| 200 | rc = this->get_record(l,this->status.last); |
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| 201 | if (rc != 0) |
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| 202 | return rc; |
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| 203 | l.next = dkey; |
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| 204 | rc = this->put_record(l,this->status.last); |
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| 205 | if (rc !=0) |
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| 206 | return rc; |
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| 207 | } |
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| 208 | |
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| 209 | // if status.next points to nothing |
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| 210 | // or |
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| 211 | // if status.next points to a record that has been committed, |
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| 212 | // then |
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| 213 | // status.next should point to the record just added |
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| 214 | |
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| 215 | // modify status record |
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| 216 | |
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| 217 | if (this->status.next == this->statuskey) // status.next points to nothing |
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| 218 | this->status.next = dkey; |
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| 219 | else // look if status.next points to a record that has already been committed |
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| 220 | { |
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| 221 | datarecord r; |
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| 222 | int rc; |
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| 223 | |
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| 224 | rc = this->get_record(r,this->status.next); |
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| 225 | if (rc != 0) |
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| 226 | return FETCHERROR; |
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| 227 | |
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| 228 | if (r.retrieved != 0) |
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| 229 | this->status.next = dkey; |
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| 230 | } |
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| 231 | |
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| 232 | if (this->status.first == this->statuskey) |
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| 233 | this->status.first = dkey; |
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| 234 | |
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| 235 | d.prev = status.last; |
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| 236 | this->status.last = dkey; |
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| 237 | |
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| 238 | this->status.count++; |
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| 239 | this->status.present++; |
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| 240 | this->status.present0++; |
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| 241 | |
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| 242 | rc = this->put_status(); |
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| 243 | if (rc != 0) |
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| 244 | return this->STOREERROR; |
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| 245 | |
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| 246 | d.value = zstrtohex(line); |
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| 247 | d.next = this->statuskey; |
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| 248 | d.retrieved = 0; |
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| 249 | |
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| 250 | rc = put_record(d,dkey); |
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| 251 | |
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| 252 | if (rc != 0) |
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| 253 | return this->STOREERROR; |
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| 254 | |
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| 255 | key = dkey.str(); |
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| 256 | return 0; |
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| 257 | } |
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| 258 | |
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| 259 | int stopos_pool::get_line(std::string &line, |
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| 260 | longuint &retrieved, |
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| 261 | std::string &key) |
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| 262 | { |
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| 263 | if (!this->db_open) |
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| 264 | return DBNOTOPEN; |
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| 265 | |
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| 266 | int rc; |
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| 267 | rc = this->get_status(); |
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| 268 | if (rc != 0) |
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| 269 | return FETCHERROR; |
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| 270 | |
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| 271 | if (this->status.next == this->statuskey) |
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| 272 | { |
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| 273 | if (!this->kvp) |
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| 274 | return NOTFOUND; |
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| 275 | // wrapping around ... |
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| 276 | status.next = status.first; |
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| 277 | |
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| 278 | if (this->status.next == this->statuskey) |
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| 279 | return NOTFOUND; |
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| 280 | } |
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| 281 | |
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| 282 | datarecord r; |
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| 283 | |
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| 284 | rc = this->get_record(r,this->status.next); |
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| 285 | if (rc != 0) |
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| 286 | return FETCHERROR; |
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| 287 | |
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| 288 | retrieved = r.retrieved; |
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| 289 | if (!this->kvp) |
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| 290 | if (r.retrieved !=0) |
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| 291 | return NOTFOUND; |
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| 292 | key = this->status.next.str(); |
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| 293 | |
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| 294 | line = zhextostr(r.value); |
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| 295 | |
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| 296 | // adjust the 'retrieved' field of r, and write it |
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| 297 | |
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| 298 | r.retrieved++; |
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| 299 | |
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| 300 | rc = this->put_record(r,status.next); |
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| 301 | if (rc != 0) |
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| 302 | return STOREERROR; |
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| 303 | |
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| 304 | // adjust the 'next' field of status. this must be equal |
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| 305 | // to the 'next' field of r |
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| 306 | |
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| 307 | this->status.next = r.next; |
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| 308 | |
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| 309 | if (r.retrieved == 1) |
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| 310 | this->status.present0--; |
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| 311 | |
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| 312 | this->put_status(); |
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| 313 | |
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| 314 | return 0; |
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| 315 | } |
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| 316 | |
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| 317 | int stopos_pool::remove_line(const std::string &k) |
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| 318 | { |
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| 319 | if (!this->db_open) |
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| 320 | return DBNOTOPEN; |
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| 321 | |
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| 322 | int rc; |
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| 323 | datarecord r; |
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| 324 | stopos_key key(k); |
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| 325 | |
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| 326 | rc = this->get_record(r,key); |
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| 327 | if (rc !=0) |
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| 328 | return rc; |
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| 329 | |
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| 330 | // remove this record from the linked lists. |
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| 331 | |
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| 332 | rc=this->get_status(); |
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| 333 | if (rc != 0) |
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| 334 | return rc; |
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| 335 | |
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| 336 | // |
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| 337 | //remove_line |
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| 338 | |
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| 339 | // r = record to remove |
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| 340 | // |
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| 341 | // situations we have to deal with: |
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| 342 | // |
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| 343 | // r.next = 0 ( = key to status) |
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| 344 | // r.next = data ( = key to data) |
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| 345 | // |
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| 346 | // r.prev = 0 |
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| 347 | // r.prev = data |
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| 348 | // |
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| 349 | // if (r.prev != 0) |
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| 350 | // get p(r.prev) |
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| 351 | // |
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| 352 | // if (r.next != 0) |
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| 353 | // get n(r.next) |
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| 354 | // |
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| 355 | // if (r.next = 0) //r is last record |
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| 356 | // { |
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| 357 | // if r.prev = data |
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| 358 | // { |
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| 359 | // p.next = r.next (=0) |
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| 360 | // if (key == s.next) |
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| 361 | // s.next = r.next ( = 0) |
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| 362 | // if (key == s.last) // must be true, r is last record |
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| 363 | // s.last = r.prev |
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| 364 | // if (key == s.first) |
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| 365 | // impossible, because there is a previous record |
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| 366 | // } |
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| 367 | // else // r.prev = 0 // this is the only record |
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| 368 | // { |
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| 369 | // s.next = r.next ( =r.prev =0) |
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| 370 | // s.first = r.prev ( = r.next =0) |
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| 371 | // s.last = r.prev ( = r.next = 0) |
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| 372 | // } |
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| 373 | // } |
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| 374 | // else // r has a follower |
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| 375 | // { |
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| 376 | // if r.prev = datarecord |
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| 377 | // { |
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| 378 | // p.next = r.next |
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| 379 | // n.prev = r.prev |
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| 380 | // if (key == s.next) |
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| 381 | // s.next = r.next |
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| 382 | // if (key == s.last) |
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| 383 | // impossible, there is a follower |
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| 384 | // if (key == s.first) |
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| 385 | // impossible, there is a predecessor |
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| 386 | // } |
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| 387 | // else // r.prev = 0: r is the first record |
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| 388 | // { |
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| 389 | // n.prev = r.prev (=0) |
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| 390 | // if (key == s.next) |
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| 391 | // s.next = r.next |
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| 392 | // if (key == s.last) |
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| 393 | // impossible, there is a follower |
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| 394 | // if (key == s.first) // must be |
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| 395 | // s.first = r.next |
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| 396 | // } |
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| 397 | // } |
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| 398 | |
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| 399 | // remove record r |
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| 400 | // |
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| 401 | |
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| 402 | this->get_record(r,key); |
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| 403 | // |
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| 404 | // situations we have to deal with: |
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| 405 | // |
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| 406 | // r.next = 0 ( = key to status) |
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| 407 | // r.next = data ( = key to data) |
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| 408 | // |
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| 409 | // r.prev = 0 |
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| 410 | // r.prev = data |
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| 411 | // |
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| 412 | |
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| 413 | datarecord p,n; |
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| 414 | |
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| 415 | if (r.prev != this->statuskey) |
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| 416 | this->get_record(p,r.prev); |
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| 417 | |
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| 418 | if (r.next != this->statuskey) |
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| 419 | this->get_record(n,r.next); |
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| 420 | // |
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| 421 | // and what to do if the next record to be dumped is |
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| 422 | // exactly this record? |
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| 423 | // |
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| 424 | // I think, status.nextd should become r.next, |
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| 425 | // whatever r.next is pointing to |
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| 426 | // However, if r.next is pointing to nothing, |
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| 427 | // we should give status.nextd an impossible value |
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| 428 | // |
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| 429 | |
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| 430 | if (this->status.nextd == key) |
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| 431 | { |
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| 432 | if (r.next == this->statuskey) |
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| 433 | this->status.nextd.impossible(); |
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| 434 | else |
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| 435 | this->status.nextd = r.next; |
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| 436 | } |
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| 437 | |
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| 438 | if (r.next == this->statuskey) // r is last record |
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| 439 | { |
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| 440 | if (r.prev != this->statuskey) // r is last record and has a predecessor |
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| 441 | { |
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| 442 | p.next = r.next; |
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| 443 | this->put_record(p,r.prev); |
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| 444 | |
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| 445 | if (key == status.next) |
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| 446 | status.next = r.next; |
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| 447 | |
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| 448 | // if (key == status.last) // always the case here |
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| 449 | status.last = r.prev; |
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| 450 | |
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| 451 | // if (key == status.first) |
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| 452 | // impossible, because there is a previous record |
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| 453 | } |
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| 454 | else // r is the only record |
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| 455 | { |
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| 456 | status.next = r.next; |
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| 457 | status.first = r.prev; |
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| 458 | status.last = r.prev; |
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| 459 | } |
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| 460 | } |
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| 461 | else // r has a follower |
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| 462 | { |
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| 463 | if (r.prev != this->statuskey) // r has a predecessor and a follower |
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| 464 | { |
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| 465 | p.next = r.next; |
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| 466 | this->put_record(p,r.prev); |
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| 467 | |
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| 468 | n.prev = r.prev; |
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| 469 | this->put_record(n,r.next); |
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| 470 | |
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| 471 | if (key == status.next) |
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| 472 | status.next = r.next; |
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| 473 | // if (key == status.last) |
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| 474 | // impossible, r has a follower |
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| 475 | // if (key == s.first) |
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| 476 | // impossible, r has a predecessor |
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| 477 | } |
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| 478 | else // r is first record and has a follower |
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| 479 | { |
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| 480 | n.prev = r.prev; |
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| 481 | this->put_record(n,r.next); |
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| 482 | |
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| 483 | if (key == status.next) |
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| 484 | status.next = r.next; |
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| 485 | |
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| 486 | // if (key == status.last) |
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| 487 | // impossible, r has a follower |
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| 488 | |
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| 489 | // if (key == status.first) // always true here |
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| 490 | status.first = r.next; |
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| 491 | } |
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| 492 | } |
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| 493 | |
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| 494 | // finally, remove the record |
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| 495 | |
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| 496 | |
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| 497 | rc = this->remove_record(key); |
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| 498 | if (rc != 0) |
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| 499 | return rc; |
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| 500 | |
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| 501 | // and rewrite status |
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| 502 | |
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| 503 | this->status.present--; |
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| 504 | if (r.retrieved == 0) |
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| 505 | this->status.present0--; |
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| 506 | |
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| 507 | rc = this->put_status(); |
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| 508 | if (rc != 0) |
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| 509 | return rc; |
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| 510 | |
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| 511 | return 0; |
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| 512 | } |
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| 513 | |
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| 514 | bool stopos_pool::is_statusrecord(const std::string &k) |
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| 515 | { |
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| 516 | return stopos_key::KeyToNumber(k) == 0; |
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| 517 | } |
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| 518 | |
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| 519 | void stopos_pool::set_kvp(bool v) |
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| 520 | { |
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| 521 | this->kvp = v; |
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| 522 | } |
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| 523 | |
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| 524 | bool stopos_pool::get_kvp(void) |
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| 525 | { |
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| 526 | return this->kvp; |
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| 527 | } |
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| 528 | |
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| 529 | int stopos_pool::get_counts(longuint &count, |
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| 530 | longuint &present, |
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| 531 | longuint &present0) |
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| 532 | { |
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| 533 | int rc = get_status(); |
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| 534 | if (rc != 0) |
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| 535 | return rc; |
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| 536 | |
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| 537 | count = status.count; |
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| 538 | present = status.present; |
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| 539 | present0 = status.present0; |
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| 540 | return 0; |
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| 541 | } |
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| 542 | |
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| 543 | int stopos_pool::dump_line(std::string &line, |
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| 544 | longuint &retrieved, |
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| 545 | std::string &key) |
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| 546 | { |
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| 547 | if (!this->db_open) |
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| 548 | return DBNOTOPEN; |
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| 549 | |
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| 550 | int rc; |
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| 551 | rc = this->get_status(); |
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| 552 | if (rc != 0) |
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| 553 | return FETCHERROR; |
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| 554 | |
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| 555 | // |
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| 556 | // if status.nextd is pointing to nothing, |
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| 557 | // we assume that one is starting the dump, |
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| 558 | // and let nextd point to the first record |
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| 559 | // |
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| 560 | |
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| 561 | if (this->status.nextd == this->statuskey) |
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| 562 | this->status.nextd = this->status.first; |
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| 563 | |
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| 564 | // if nextd is still pointing to nothing, |
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| 565 | // there is nothing |
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| 566 | |
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| 567 | if (this->status.nextd == this->statuskey) |
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| 568 | return NOTFOUND; |
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| 569 | |
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| 570 | datarecord r; |
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| 571 | |
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| 572 | rc = this->get_record(r,this->status.nextd); |
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| 573 | if (rc != 0) |
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| 574 | { |
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| 575 | this->status.nextd = this->status.first; |
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| 576 | this->put_status(); |
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| 577 | return NOTFOUND; |
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| 578 | } |
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| 579 | |
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| 580 | key = this->status.nextd.str(); |
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| 581 | |
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| 582 | retrieved = r.retrieved; |
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| 583 | |
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| 584 | line = zhextostr(r.value); |
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| 585 | |
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| 586 | this->status.nextd = r.next; |
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| 587 | |
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| 588 | if (this->status.nextd == this->statuskey) // we signal that we reached eoi |
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| 589 | this->status.nextd.impossible(); // at the next call |
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| 590 | |
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| 591 | this->put_status(); |
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| 592 | |
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| 593 | return 0; |
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| 594 | } |
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| 595 | |
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| 596 | datarecord::datarecord() |
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| 597 | { |
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| 598 | this->retrieved = 0; |
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| 599 | } |
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| 600 | |
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| 601 | datarecord::datarecord(const std::string &s, |
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| 602 | char sep) |
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| 603 | { |
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| 604 | std::vector <std::string> v; |
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| 605 | split(v,s,sep); |
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| 606 | |
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| 607 | this->prev = stopos_key(v[0]); |
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| 608 | this->next = stopos_key(v[1]); |
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| 609 | this->retrieved = StringToNumber<longuint>(v[2]); |
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| 610 | this->value = v[3]; |
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| 611 | } |
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| 612 | |
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| 613 | std::string datarecord::str(char sep) const |
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| 614 | { |
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| 615 | std::string r; |
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| 616 | r = this->prev.str() + sep |
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| 617 | + this->next.str() + sep |
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| 618 | + NumberToString(this->retrieved) + sep |
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| 619 | + this->value |
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| 620 | ; |
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| 621 | |
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| 622 | return r; |
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| 623 | } |
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| 624 | |
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| 625 | statusrecord::statusrecord(void) |
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| 626 | { |
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| 627 | this->init(); |
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| 628 | } |
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| 629 | |
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| 630 | statusrecord::statusrecord(const std::string &s, |
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| 631 | char sep) |
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| 632 | { |
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| 633 | std:: vector <std::string> v; |
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| 634 | |
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| 635 | split(v,s,sep); |
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| 636 | this->next = stopos_key(v[0]); |
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| 637 | this->first = stopos_key(v[1]); |
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| 638 | this->last = stopos_key(v[2]); |
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| 639 | this->nextd = stopos_key(v[3]); |
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| 640 | this->count = StringToNumber<longuint>(v[4]); |
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| 641 | this->present = StringToNumber<longuint>(v[5]); |
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| 642 | this->present0 = StringToNumber<longuint>(v[6]); |
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| 643 | this->extra = v[7]; |
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| 644 | |
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| 645 | } |
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| 646 | void statusrecord::init(void) |
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| 647 | { |
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| 648 | this->next = stopos_key(); |
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| 649 | this->first = stopos_key(); |
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| 650 | this->last = stopos_key(); |
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| 651 | this->nextd = stopos_key(); |
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| 652 | this->count = 0; |
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| 653 | this->present = 0; |
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| 654 | this->present0 = 0; |
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| 655 | // note: extra is not initialized here, that is |
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| 656 | // something for a derived class |
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| 657 | } |
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| 658 | |
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| 659 | std::string statusrecord::str(char sep) |
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| 660 | { |
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| 661 | std::string r; |
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| 662 | r = this->next.str() + sep |
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| 663 | + this->first.str() + sep |
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| 664 | + this->last.str() + sep |
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| 665 | + this->nextd.str() + sep |
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| 666 | + NumberToString(this->count) + sep |
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| 667 | + NumberToString(this->present) + sep |
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| 668 | + NumberToString(this->present0) + sep |
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| 669 | + this->extra |
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| 670 | ; |
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| 671 | return r; |
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| 672 | } |
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| 673 | |
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