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.DataAccess.Interfaces;
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27 | using HeuristicLab.PluginInfrastructure;
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28 | using System.Data.Common;
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29 |
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30 | namespace HeuristicLab.DataAccess.ADOHelper {
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31 | public class Session: ISession {
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32 | private static DiscoveryService discoveryService =
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33 | new DiscoveryService();
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34 |
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35 | private SessionFactory factory;
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36 |
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37 | private Transaction transaction;
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38 |
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39 | private DbConnection connection;
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40 |
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41 | private IDictionary<Guid, object> adapters =
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42 | new Dictionary<Guid, object>();
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43 |
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44 | public Session(SessionFactory factory) {
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45 | this.factory = factory;
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46 | }
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47 |
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48 | public DbConnection Connection {
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49 | get {
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50 | if (connection == null) {
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51 | connection = factory.CreateConnection();
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52 | }
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53 |
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54 | return connection;
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55 | }
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56 | }
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57 |
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58 | public void DetachTrasaction() {
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59 | this.transaction = null;
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60 | }
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61 |
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62 | #region ISession Members
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63 | public ITransaction BeginTransaction() {
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64 | if (transaction == null) {
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65 | transaction = new Transaction(this);
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66 | transaction.Connection = Connection;
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67 | }
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68 |
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69 | return transaction;
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70 | }
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71 |
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72 | public ITransaction GetCurrentTransaction() {
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73 | return transaction;
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74 | }
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75 |
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76 | public IDataAdapter<ObjT> GetDataAdapter<ObjT>()
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77 | where ObjT : IPersistableObject {
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78 | Guid adapterId = typeof(IDataAdapter<ObjT>).GUID;
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79 |
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80 | if (!adapters.ContainsKey(adapterId)) {
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81 | IDataAdapter<ObjT> adapter =
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82 | discoveryService.GetInstances<IDataAdapter<ObjT>>()[0];
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83 |
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84 | adapter.Session = this;
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85 |
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86 | adapters.Add(adapterId, adapter);
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87 | }
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88 |
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89 | return adapters[adapterId] as IDataAdapter<ObjT>;
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90 | }
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91 |
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92 | public T GetDataAdapter<ObjT, T>()
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93 | where ObjT : IPersistableObject
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94 | where T : class, IDataAdapter<ObjT>
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95 | {
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96 | Guid adapterId = typeof(T).GUID;
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97 |
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98 | if (!adapters.ContainsKey(adapterId)) {
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99 | T adapter =
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100 | discoveryService.GetInstances<T>()[0];
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101 |
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102 | adapter.Session = this;
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103 |
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104 | adapters.Add(adapterId, adapter);
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105 | }
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106 |
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107 | return adapters[adapterId] as T;
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108 | }
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109 |
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110 | public void EndSession() {
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111 | if (transaction != null) {
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112 | transaction.Rollback();
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113 | transaction = null;
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114 | }
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115 | if (connection.State == System.Data.ConnectionState.Open) {
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116 | connection.Close();
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117 | connection = null;
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118 | }
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119 | factory.EndSession(this);
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120 | }
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121 |
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122 | #endregion
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123 | }
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124 | }
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