[995] | 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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[1026] | 27 | using System.Data;
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[1134] | 28 | using System.Threading;
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[995] | 29 |
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| 30 | namespace HeuristicLab.Hive.Server.ADODataAccess {
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| 31 | abstract class CachedDataAdapter<AdapterT, ObjT, RowT, CacheT> :
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[1128] | 32 | DataAdapterBase<AdapterT, ObjT, RowT>,
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[995] | 33 | ICachedDataAdapter
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[1128] | 34 | where CacheT : System.Data.TypedTableBase<RowT>, new()
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[995] | 35 | where AdapterT : new()
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| 36 | where RowT : System.Data.DataRow
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| 37 | where ObjT : IHiveObject, new() {
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[1131] | 38 | protected static CacheT cache =
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[995] | 39 | new CacheT();
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| 40 |
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[1131] | 41 | private static bool cacheFilled = false;
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[1128] | 42 |
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[1155] | 43 | private static ReaderWriterLockSlim cacheLock =
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[1158] | 44 | new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
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[1134] | 45 |
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[1131] | 46 | protected DataTable dataTable =
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| 47 | new DataTable();
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| 48 |
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[995] | 49 | protected ICollection<ICachedDataAdapter> parentAdapters =
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| 50 | new List<ICachedDataAdapter>();
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| 51 |
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| 52 | protected CachedDataAdapter() {
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[1155] | 53 | cacheLock.EnterWriteLock();
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[1134] | 54 |
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[1131] | 55 | if (!cacheFilled) {
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| 56 | FillCache();
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| 57 | cacheFilled = true;
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| 58 | }
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[995] | 59 |
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[1155] | 60 | cacheLock.ExitWriteLock();
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[1134] | 61 |
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[995] | 62 | ServiceLocator.GetTransactionManager().OnUpdate +=
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| 63 | new EventHandler(CachedDataAdapter_OnUpdate);
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| 64 | }
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| 65 |
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[1128] | 66 | protected virtual RowT FindSingleRow(Selector dbSelector,
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[995] | 67 | Selector cacheSelector) {
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[1155] | 68 | cacheLock.EnterReadLock();
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[1134] | 69 |
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[995] | 70 | RowT row =
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| 71 | FindSingleRow(cacheSelector);
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| 72 |
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| 73 | //not in cache
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| 74 | if (row == null) {
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| 75 | row =
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| 76 | FindSingleRow(dbSelector);
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| 77 | }
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| 78 |
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[1155] | 79 | cacheLock.ExitReadLock();
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[1134] | 80 |
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[995] | 81 | return row;
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| 82 | }
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| 83 |
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| 84 | protected virtual IEnumerable<RowT> FindMultipleRows(Selector dbSelector,
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| 85 | Selector cacheSelector) {
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[1155] | 86 | cacheLock.EnterReadLock();
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[1134] | 87 |
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[995] | 88 | IList<RowT> result =
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| 89 | new List<RowT>(cacheSelector());
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| 90 |
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| 91 | IEnumerable<RowT> result2 =
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| 92 | dbSelector();
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| 93 |
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| 94 | foreach (RowT row in result2) {
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| 95 | if (!IsCached(row)) {
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| 96 | result.Add(row);
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| 97 | }
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| 98 | }
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| 99 |
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[1155] | 100 | cacheLock.ExitReadLock();
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[1134] | 101 |
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[995] | 102 | return result;
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| 103 | }
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| 104 |
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| 105 | protected virtual ObjT FindSingle(Selector dbSelector,
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| 106 | Selector cacheSelector) {
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[1152] | 107 | ObjT obj = default(ObjT);
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| 108 |
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[1155] | 109 | cacheLock.EnterReadLock();
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[1152] | 110 |
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[995] | 111 | RowT row = FindSingleRow(dbSelector, cacheSelector);
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| 112 |
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| 113 | if (row != null) {
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[1152] | 114 | obj = new ObjT();
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[1131] | 115 | obj = Convert(row, obj);
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[995] | 116 | }
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[1152] | 117 |
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[1155] | 118 | cacheLock.ExitReadLock();
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[1152] | 119 |
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| 120 | return obj;
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[995] | 121 | }
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| 122 |
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| 123 | protected virtual ICollection<ObjT> FindMultiple(Selector dbSelector,
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| 124 | Selector cacheSelector) {
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[1155] | 125 | cacheLock.EnterReadLock();
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[1134] | 126 |
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[995] | 127 | ICollection<ObjT> result =
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| 128 | FindMultiple(cacheSelector);
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| 129 |
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| 130 | ICollection<ObjT> resultDb =
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| 131 | FindMultiple(dbSelector);
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| 132 |
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[1155] | 133 | cacheLock.ExitReadLock();
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[1134] | 134 |
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[995] | 135 | foreach (ObjT obj in resultDb) {
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| 136 | if (!result.Contains(obj))
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| 137 | result.Add(obj);
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| 138 | }
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| 139 |
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| 140 | return result;
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| 141 | }
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| 142 |
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| 143 | protected abstract RowT InsertNewRowInCache(ObjT obj);
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| 144 |
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| 145 | protected abstract void FillCache();
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| 146 |
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[1149] | 147 | protected abstract void SynchronizeWithDb();
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[995] | 148 |
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| 149 | protected abstract bool PutInCache(ObjT obj);
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| 150 |
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| 151 | protected abstract RowT FindCachedById(long id);
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| 152 |
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[1149] | 153 | public void SyncWithDb() {
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| 154 | foreach (ICachedDataAdapter parent in this.parentAdapters) {
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[995] | 155 | parent.SyncWithDb();
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| 156 | }
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| 157 |
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[1155] | 158 | cacheLock.EnterReadLock();
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[1146] | 159 |
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[1149] | 160 | this.SynchronizeWithDb();
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[1146] | 161 |
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[1155] | 162 | cacheLock.ExitReadLock();
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[995] | 163 | }
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| 164 |
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[1149] | 165 | void CachedDataAdapter_OnUpdate(object sender, EventArgs e) {
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| 166 | this.SyncWithDb();
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| 167 | }
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| 168 |
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[995] | 169 | protected virtual bool IsCached(RowT row) {
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[1029] | 170 | if (row == null)
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| 171 | return false;
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[1149] | 172 | else {
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[1155] | 173 | cacheLock.EnterReadLock();
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[1149] | 174 |
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| 175 | bool cached = FindCachedById((long)row[row.Table.PrimaryKey[0]]) != null;
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| 176 |
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[1155] | 177 | cacheLock.ExitReadLock();
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[1149] | 178 |
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| 179 | return cached;
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| 180 | }
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[995] | 181 | }
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| 182 |
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| 183 | protected override RowT GetRowById(long id) {
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[1155] | 184 | cacheLock.EnterReadLock();
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[1152] | 185 |
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[995] | 186 | RowT row =
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| 187 | FindCachedById(id);
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[1128] | 188 |
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[1152] | 189 | //not in cache
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[1128] | 190 | if (row == null)
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[995] | 191 | row = FindSingleRow(
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| 192 | delegate() {
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| 193 | return FindById(id);
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| 194 | });
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| 195 |
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[1155] | 196 | cacheLock.ExitReadLock();
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[1152] | 197 |
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[995] | 198 | return row;
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| 199 | }
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| 200 |
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[1134] | 201 | private void AddToCache(RowT row) {
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[1155] | 202 | cacheLock.EnterWriteLock();
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[1134] | 203 |
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| 204 | cache.ImportRow(row);
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| 205 | row.Table.Rows.Remove(row);
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| 206 |
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[1155] | 207 | cacheLock.ExitWriteLock();
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[1134] | 208 | }
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| 209 |
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| 210 | private RowT AddToCache(ObjT obj) {
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[1155] | 211 | cacheLock.EnterWriteLock();
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[1134] | 212 |
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| 213 | RowT row = InsertNewRowInCache(obj);
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| 214 |
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[1155] | 215 | cacheLock.ExitWriteLock();
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[1134] | 216 |
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| 217 | return row;
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| 218 | }
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| 219 |
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| 220 | private void RemoveRowFromCache(RowT row) {
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[1155] | 221 | cacheLock.EnterWriteLock();
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[1134] | 222 |
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| 223 | dataTable.ImportRow(row);
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| 224 | cache.Rows.Remove(row);
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| 225 |
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[1155] | 226 | cacheLock.ExitWriteLock();
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[1134] | 227 |
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| 228 | UpdateRow(row);
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| 229 | }
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| 230 |
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[995] | 231 | public override void Update(ObjT obj) {
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| 232 | if (obj != null) {
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[1128] | 233 | RowT row =
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[995] | 234 | GetRowById(obj.Id);
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| 235 |
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| 236 | if (row == null) {
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| 237 | if (PutInCache(obj)) {
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[1134] | 238 | row = AddToCache(obj);
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[995] | 239 | } else {
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| 240 | row = InsertNewRow(obj);
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| 241 | }
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| 242 |
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| 243 | UpdateRow(row);
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| 244 | }
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| 245 |
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[1029] | 246 | obj.Id = (long)row[row.Table.PrimaryKey[0]];
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[1134] | 247 | LockRow(obj.Id);
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[1029] | 248 |
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[1131] | 249 | ConvertObj(obj, row);
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[995] | 250 |
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[1029] | 251 | if (!IsCached(row))
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| 252 | UpdateRow(row);
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[1128] | 253 |
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[995] | 254 | if (IsCached(row) &&
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[1134] | 255 | !PutInCache(obj)) {
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[1131] | 256 | RemoveRowFromCache(row);
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[1021] | 257 | } else if (!IsCached(row) &&
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| 258 | PutInCache(obj)) {
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[1134] | 259 | AddToCache(row);
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| 260 | }
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| 261 |
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| 262 | UnlockRow(obj.Id);
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[995] | 263 | }
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| 264 | }
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| 265 | }
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| 266 | }
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[1128] | 267 |
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