[1377] | 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.Text;
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| 25 | using System.Data;
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| 26 | using System.Threading;
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| 27 | using HeuristicLab.DataAccess.Interfaces;
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| 28 |
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| 29 | namespace HeuristicLab.DataAccess.ADOHelper {
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| 30 | public 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 : IPersistableObject, new() {
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| 37 | protected static CacheT cache =
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| 38 | new CacheT();
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| 39 |
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| 40 | private static bool cacheFilled = false;
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| 41 |
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| 42 | private static ReaderWriterLockSlim cacheLock =
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| 43 | new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
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| 44 |
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| 45 | protected ICollection<ICachedDataAdapter> parentAdapters =
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| 46 | new List<ICachedDataAdapter>();
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| 47 |
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| 48 | protected CachedDataAdapter(IDBSynchronizer synchronizer) {
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| 49 | cacheLock.EnterWriteLock();
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| 50 |
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| 51 | if (!cacheFilled) {
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| 52 | FillCache();
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| 53 | cacheFilled = true;
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| 54 | }
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| 55 |
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| 56 | cacheLock.ExitWriteLock();
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| 57 |
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| 58 | synchronizer.OnUpdate +=
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| 59 | new EventHandler(CachedDataAdapter_OnUpdate);
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| 60 | }
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| 61 |
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| 62 | protected virtual RowT FindSingleRow(Selector dbSelector,
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| 63 | Selector cacheSelector) {
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| 64 | cacheLock.EnterReadLock();
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| 65 |
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| 66 | RowT row =
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| 67 | FindSingleRow(cacheSelector);
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| 68 |
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| 69 | //not in cache
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| 70 | if (row == null) {
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| 71 | row =
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| 72 | FindSingleRow(dbSelector);
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| 73 | }
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| 74 |
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| 75 | cacheLock.ExitReadLock();
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| 76 |
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| 77 | return row;
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| 78 | }
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| 79 |
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| 80 | protected virtual IEnumerable<RowT> FindMultipleRows(Selector dbSelector,
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| 81 | Selector cacheSelector) {
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| 82 | cacheLock.EnterReadLock();
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| 83 |
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| 84 | IList<RowT> result =
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| 85 | new List<RowT>(cacheSelector());
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| 86 |
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| 87 | IEnumerable<RowT> result2 =
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| 88 | dbSelector();
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| 89 |
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| 90 | foreach (RowT row in result2) {
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| 91 | if (!IsCached(row)) {
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| 92 | result.Add(row);
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| 93 | }
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| 94 | }
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| 95 |
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| 96 | cacheLock.ExitReadLock();
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| 97 |
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| 98 | return result;
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| 99 | }
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| 100 |
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| 101 | protected virtual ObjT FindSingle(Selector dbSelector,
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| 102 | Selector cacheSelector) {
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| 103 | ObjT obj = default(ObjT);
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| 104 |
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| 105 | cacheLock.EnterReadLock();
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| 106 |
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| 107 | RowT row = FindSingleRow(dbSelector, cacheSelector);
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| 108 |
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| 109 | if (row != null) {
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| 110 | obj = new ObjT();
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| 111 | obj = Convert(row, obj);
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| 112 | }
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| 113 |
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| 114 | cacheLock.ExitReadLock();
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| 115 |
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| 116 | return obj;
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| 117 | }
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| 118 |
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| 119 | protected virtual ICollection<ObjT> FindMultiple(Selector dbSelector,
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| 120 | Selector cacheSelector) {
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| 121 | cacheLock.EnterReadLock();
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| 122 |
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| 123 | ICollection<ObjT> result =
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| 124 | FindMultiple(cacheSelector);
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| 125 |
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| 126 | ICollection<ObjT> resultDb =
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| 127 | FindMultiple(dbSelector);
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| 128 |
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| 129 | cacheLock.ExitReadLock();
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| 130 |
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| 131 | foreach (ObjT obj in resultDb) {
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| 132 | if (!result.Contains(obj))
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| 133 | result.Add(obj);
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| 134 | }
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| 135 |
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| 136 | return result;
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| 137 | }
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| 138 |
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| 139 | protected abstract RowT InsertNewRowInCache(ObjT obj);
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| 140 |
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| 141 | protected abstract void FillCache();
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| 142 |
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| 143 | protected abstract void SynchronizeWithDb();
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| 144 |
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| 145 | protected abstract bool PutInCache(ObjT obj);
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| 146 |
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[1449] | 147 | protected abstract RowT FindCachedById(Guid id);
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[1377] | 148 |
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| 149 | public void SyncWithDb() {
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| 150 | foreach (ICachedDataAdapter parent in this.parentAdapters) {
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| 151 | parent.SyncWithDb();
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| 152 | }
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| 153 |
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| 154 | cacheLock.EnterReadLock();
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| 155 |
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| 156 | this.SynchronizeWithDb();
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| 157 |
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| 158 | cacheLock.ExitReadLock();
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| 159 | }
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| 160 |
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| 161 | void CachedDataAdapter_OnUpdate(object sender, EventArgs e) {
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| 162 | this.SyncWithDb();
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| 163 | }
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| 164 |
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| 165 | protected virtual bool IsCached(RowT row) {
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| 166 | if (row == null)
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| 167 | return false;
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| 168 | else {
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| 169 | cacheLock.EnterReadLock();
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| 170 |
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[1449] | 171 | bool cached = FindCachedById((Guid)row[row.Table.PrimaryKey[0]]) != null;
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[1377] | 172 |
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| 173 | cacheLock.ExitReadLock();
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| 174 |
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| 175 | return cached;
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| 176 | }
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| 177 | }
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| 178 |
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[1449] | 179 | protected override RowT GetRowById(Guid id) {
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[1377] | 180 | cacheLock.EnterReadLock();
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| 181 |
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| 182 | RowT row =
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| 183 | FindCachedById(id);
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| 184 |
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| 185 | //not in cache
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| 186 | if (row == null)
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| 187 | row = FindSingleRow(
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| 188 | delegate() {
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| 189 | return FindById(id);
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| 190 | });
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| 191 |
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| 192 | cacheLock.ExitReadLock();
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| 193 |
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| 194 | return row;
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| 195 | }
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| 196 |
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| 197 | private void AddToCache(RowT row) {
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| 198 | cacheLock.EnterWriteLock();
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| 199 |
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| 200 | cache.ImportRow(row);
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| 201 | row.Table.Rows.Remove(row);
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| 202 |
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| 203 | cacheLock.ExitWriteLock();
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| 204 | }
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| 205 |
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| 206 | private RowT AddToCache(ObjT obj) {
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| 207 | cacheLock.EnterWriteLock();
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| 208 |
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| 209 | RowT row = InsertNewRowInCache(obj);
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| 210 |
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| 211 | cacheLock.ExitWriteLock();
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| 212 |
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| 213 | return row;
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| 214 | }
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| 215 |
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| 216 | private void RemoveRowFromCache(RowT row) {
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| 217 | cacheLock.EnterWriteLock();
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| 218 |
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| 219 | UpdateRow(row);
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| 220 |
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| 221 | row.Table.Rows.Remove(row);
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| 222 |
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| 223 | cacheLock.ExitWriteLock();
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| 224 | }
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| 225 |
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[1452] | 226 | public override ObjT GetById(Guid id) {
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| 227 | return FindSingle(
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| 228 | delegate() {
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| 229 | return FindById(id);
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| 230 | },
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| 231 | delegate() {
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| 232 | List<RowT> found =
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| 233 | new List<RowT>();
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| 234 | found.Add(
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| 235 | FindCachedById(id));
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| 236 | return found;
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| 237 | });
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| 238 | }
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| 239 |
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[1377] | 240 | public override void Update(ObjT obj) {
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| 241 | if (obj != null) {
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| 242 | RowT row = null;
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[1449] | 243 | Guid locked = Guid.Empty;
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[1377] | 244 |
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[1449] | 245 | if (obj.Id != Guid.Empty) {
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[1377] | 246 | LockRow(obj.Id);
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| 247 | locked = obj.Id;
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| 248 |
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| 249 | row = GetRowById(obj.Id);
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[1449] | 250 | } else {
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| 251 | obj.Id = Guid.NewGuid();
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[1377] | 252 | }
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| 253 |
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| 254 | if (row == null) {
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| 255 | if (PutInCache(obj)) {
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| 256 | row = AddToCache(obj);
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| 257 | } else {
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| 258 | row = InsertNewRow(obj);
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[1449] | 259 | UpdateRow(row);
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[1377] | 260 | }
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| 261 | }
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| 262 |
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[1449] | 263 | if (locked == Guid.Empty)
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| 264 | {
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[1377] | 265 | LockRow(obj.Id);
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| 266 | locked = obj.Id;
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| 267 | }
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| 268 |
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| 269 | ConvertObj(obj, row);
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| 270 |
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| 271 | if (!IsCached(row))
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| 272 | UpdateRow(row);
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| 273 |
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| 274 | if (IsCached(row) &&
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| 275 | !PutInCache(obj)) {
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| 276 | RemoveRowFromCache(row);
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| 277 | } else if (!IsCached(row) &&
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| 278 | PutInCache(obj)) {
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| 279 | AddToCache(row);
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| 280 | }
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| 281 |
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| 282 | UnlockRow(locked);
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| 283 | }
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| 284 | }
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| 285 | }
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| 286 | }
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| 287 |
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