1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using System.Text;
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26 | using HeuristicLab.Hive.Contracts.BusinessObjects;
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27 | using System.Runtime.CompilerServices;
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28 |
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29 | namespace HeuristicLab.Hive.Server.ADODataAccess {
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30 | abstract class CachedDataAdapter<AdapterT, ObjT, RowT, CacheT> :
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31 | DataAdapterBase<AdapterT, ObjT, RowT>,
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32 | ICachedDataAdapter
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33 | where CacheT: System.Data.TypedTableBase<RowT>, new()
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34 | where AdapterT : new()
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35 | where RowT : System.Data.DataRow
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36 | where ObjT : IHiveObject, new() {
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37 | protected CacheT cache =
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38 | new CacheT();
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39 |
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40 | protected ICollection<ICachedDataAdapter> parentAdapters =
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41 | new List<ICachedDataAdapter>();
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42 |
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43 | protected CachedDataAdapter() {
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44 | FillCache();
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45 |
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46 | ServiceLocator.GetTransactionManager().OnUpdate +=
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47 | new EventHandler(CachedDataAdapter_OnUpdate);
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48 | }
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49 |
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50 | protected virtual RowT FindSingleRow(Selector dbSelector,
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51 | Selector cacheSelector) {
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52 | RowT row =
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53 | FindSingleRow(cacheSelector);
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54 |
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55 | //not in cache
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56 | if (row == null) {
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57 | row =
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58 | FindSingleRow(dbSelector);
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59 | }
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60 |
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61 | return row;
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62 | }
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63 |
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64 | protected virtual IEnumerable<RowT> FindMultipleRows(Selector dbSelector,
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65 | Selector cacheSelector) {
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66 | IList<RowT> result =
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67 | new List<RowT>(cacheSelector());
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68 |
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69 | IEnumerable<RowT> result2 =
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70 | dbSelector();
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71 |
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72 | foreach (RowT row in result2) {
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73 | if (!IsCached(row)) {
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74 | result.Add(row);
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75 | }
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76 | }
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77 |
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78 | return result;
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79 | }
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80 |
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81 | protected virtual ObjT FindSingle(Selector dbSelector,
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82 | Selector cacheSelector) {
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83 | RowT row = FindSingleRow(dbSelector, cacheSelector);
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84 |
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85 | if (row != null) {
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86 | ObjT obj = new ObjT();
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87 | Convert(row, obj);
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88 |
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89 | return obj;
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90 | } else {
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91 | return default(ObjT);
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92 | }
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93 | }
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94 |
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95 | protected virtual ICollection<ObjT> FindMultiple(Selector dbSelector,
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96 | Selector cacheSelector) {
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97 | ICollection<ObjT> result =
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98 | FindMultiple(cacheSelector);
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99 |
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100 | ICollection<ObjT> resultDb =
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101 | FindMultiple(dbSelector);
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102 |
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103 | foreach (ObjT obj in resultDb) {
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104 | if (!result.Contains(obj))
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105 | result.Add(obj);
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106 | }
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107 |
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108 | return result;
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109 | }
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110 |
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111 | protected abstract RowT InsertNewRowInCache(ObjT obj);
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112 |
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113 | protected abstract void FillCache();
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114 |
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115 | public abstract void SyncWithDb();
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116 |
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117 | protected abstract bool PutInCache(ObjT obj);
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118 |
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119 | protected abstract RowT FindCachedById(long id);
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120 |
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121 | void CachedDataAdapter_OnUpdate(object sender, EventArgs e) {
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122 | foreach (ICachedDataAdapter parent in this.parentAdapters) {
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123 | parent.SyncWithDb();
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124 | }
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125 |
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126 | this.SyncWithDb();
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127 | }
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128 |
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129 | protected virtual void RemoveRowFromCache(RowT row) {
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130 | cache.Rows.Remove(row);
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131 | }
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132 |
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133 | protected virtual bool IsCached(RowT row) {
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134 | return cache.Contains<RowT>(row);
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135 | }
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136 |
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137 | protected override RowT GetRowById(long id) {
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138 | RowT row =
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139 | FindCachedById(id);
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140 |
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141 | if(row == null)
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142 | row = FindSingleRow(
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143 | delegate() {
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144 | return FindById(id);
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145 | });
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146 |
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147 | return row;
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148 | }
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149 |
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150 | [MethodImpl(MethodImplOptions.Synchronized)]
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151 | public override void Update(ObjT obj) {
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152 | if (obj != null) {
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153 | RowT row =
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154 | GetRowById(obj.Id);
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155 |
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156 | if (row == null) {
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157 | if (PutInCache(obj)) {
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158 | row = InsertNewRowInCache(obj);
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159 | } else {
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160 | row = InsertNewRow(obj);
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161 | }
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162 |
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163 | UpdateRow(row);
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164 | }
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165 |
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166 | Convert(obj, row);
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167 |
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168 | if (IsCached(row) &&
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169 | !PutInCache(obj)) {
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170 | //remove from cache
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171 | UpdateRow(row);
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172 | RemoveRowFromCache(row);
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173 | }
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174 |
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175 | obj.Id = (long)row[row.Table.PrimaryKey[0]];
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176 |
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177 | if (!IsCached(row))
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178 | UpdateRow(row);
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179 | }
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180 | }
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181 | }
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182 | }
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