[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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[1134] | 43 | private static ReaderWriterLock cacheLock =
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| 44 | new ReaderWriterLock();
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| 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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[1134] | 53 | cacheLock.AcquireWriterLock(Timeout.Infinite);
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| 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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[1134] | 60 | cacheLock.ReleaseWriterLock();
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| 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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[1134] | 68 | cacheLock.AcquireReaderLock(Timeout.Infinite);
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| 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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[1134] | 79 | cacheLock.ReleaseReaderLock();
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| 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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[1134] | 86 | cacheLock.AcquireReaderLock(Timeout.Infinite);
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| 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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[1134] | 100 | cacheLock.ReleaseReaderLock();
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| 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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| 107 | RowT row = FindSingleRow(dbSelector, cacheSelector);
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| 108 |
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| 109 | if (row != null) {
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| 110 | ObjT obj = new ObjT();
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[1131] | 111 | obj = Convert(row, obj);
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| 112 |
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[995] | 113 | return obj;
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| 114 | } else {
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| 115 | return default(ObjT);
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| 116 | }
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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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[1134] | 121 | cacheLock.AcquireReaderLock(Timeout.Infinite);
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| 122 |
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[995] | 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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[1134] | 129 | cacheLock.ReleaseReaderLock();
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| 130 |
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[995] | 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 | public abstract void SyncWithDb();
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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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| 147 | protected abstract RowT FindCachedById(long id);
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| 148 |
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| 149 | void CachedDataAdapter_OnUpdate(object sender, EventArgs e) {
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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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[1146] | 154 | cacheLock.AcquireReaderLock(Timeout.Infinite);
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| 155 |
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[995] | 156 | this.SyncWithDb();
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[1146] | 157 |
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| 158 | cacheLock.ReleaseReaderLock();
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[995] | 159 | }
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| 160 |
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| 161 | protected virtual bool IsCached(RowT row) {
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[1029] | 162 | if (row == null)
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| 163 | return false;
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[1128] | 164 | else
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[1029] | 165 | return FindCachedById((long)row[row.Table.PrimaryKey[0]]) != null;
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[995] | 166 | }
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| 167 |
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| 168 | protected override RowT GetRowById(long id) {
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| 169 | RowT row =
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| 170 | FindCachedById(id);
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[1128] | 171 |
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| 172 | if (row == null)
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[995] | 173 | row = FindSingleRow(
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| 174 | delegate() {
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| 175 | return FindById(id);
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| 176 | });
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| 177 |
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| 178 | return row;
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| 179 | }
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| 180 |
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[1134] | 181 | private void AddToCache(RowT row) {
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| 182 | cacheLock.AcquireWriterLock(Timeout.Infinite);
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| 183 |
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| 184 | cache.ImportRow(row);
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| 185 | row.Table.Rows.Remove(row);
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| 186 |
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| 187 | cacheLock.ReleaseWriterLock();
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| 188 | }
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| 189 |
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| 190 | private RowT AddToCache(ObjT obj) {
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| 191 | cacheLock.AcquireWriterLock(Timeout.Infinite);
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| 192 |
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| 193 | RowT row = InsertNewRowInCache(obj);
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| 194 |
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| 195 | cacheLock.ReleaseWriterLock();
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| 196 |
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| 197 | return row;
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| 198 | }
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| 199 |
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| 200 | private void RemoveRowFromCache(RowT row) {
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| 201 | cacheLock.AcquireWriterLock(Timeout.Infinite);
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| 202 |
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| 203 | dataTable.ImportRow(row);
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| 204 | cache.Rows.Remove(row);
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| 205 |
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| 206 | cacheLock.ReleaseWriterLock();
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| 207 |
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| 208 | UpdateRow(row);
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| 209 | }
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| 210 |
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[995] | 211 | public override void Update(ObjT obj) {
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| 212 | if (obj != null) {
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[1128] | 213 | RowT row =
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[995] | 214 | GetRowById(obj.Id);
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| 215 |
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| 216 | if (row == null) {
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| 217 | if (PutInCache(obj)) {
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[1134] | 218 | row = AddToCache(obj);
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[995] | 219 | } else {
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| 220 | row = InsertNewRow(obj);
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| 221 | }
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| 222 |
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| 223 | UpdateRow(row);
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| 224 | }
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| 225 |
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[1029] | 226 | obj.Id = (long)row[row.Table.PrimaryKey[0]];
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[1134] | 227 | LockRow(obj.Id);
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[1029] | 228 |
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[1131] | 229 | ConvertObj(obj, row);
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[995] | 230 |
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[1029] | 231 | if (!IsCached(row))
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| 232 | UpdateRow(row);
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[1128] | 233 |
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[995] | 234 | if (IsCached(row) &&
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[1134] | 235 | !PutInCache(obj)) {
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[1131] | 236 | RemoveRowFromCache(row);
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[1021] | 237 | } else if (!IsCached(row) &&
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| 238 | PutInCache(obj)) {
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[1134] | 239 | AddToCache(row);
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| 240 | }
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| 241 |
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| 242 | UnlockRow(obj.Id);
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[995] | 243 | }
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| 244 | }
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| 245 | }
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| 246 | }
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[1128] | 247 |
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