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source: trunk/sources/HeuristicLab.Services.Hive.DataAccess/3.3/TransactionManager.cs @ 7807

Last change on this file since 7807 was 7259, checked in by swagner, 13 years ago

Updated year of copyrights to 2012 (#1716)

File size: 3.2 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Transactions;
24using HeuristicLab.Services.Hive.DataAccess;
25
26namespace HeuristicLab.Services.Hive.DataAccess { 
27  public class TransactionManager : ITransactionManager {   
28    public void UseTransaction(Action call, bool serializable = false, bool longRunning = false) {
29      int n = 10;
30      while (n > 0) {
31        TransactionScope transaction = CreateTransaction(serializable, longRunning);
32        try {
33          call();
34          transaction.Complete();
35          n = 0;
36        }
37        catch (System.Data.SqlClient.SqlException e) {
38          n--; // probably deadlock situation, let it roll back and repeat the transaction n times
39          LogFactory.GetLogger(typeof(TransactionManager).Namespace).Log(string.Format("Exception occured, repeating transaction {0} more times. Details: {1}", n, e.ToString()));         
40          if (n <= 0) throw;
41        }
42        finally {
43          transaction.Dispose();
44        }
45      }
46    }
47
48    public T UseTransaction<T>(Func<T> call, bool serializable = false, bool longRunning = false) {
49      int n = 10;
50      while (n > 0) {
51        TransactionScope transaction = CreateTransaction(serializable, longRunning);
52        try {
53          T result = call();
54          transaction.Complete();
55          n = 0;
56          return result;
57        }
58        catch (System.Data.SqlClient.SqlException e) {
59          n--; // probably deadlock situation, let it roll back and repeat the transaction n times
60          LogFactory.GetLogger(typeof(TransactionManager).Namespace).Log(string.Format("Exception occured, repeating transaction {0} more times. Details: {1}", n, e.ToString()));
61          if (n <= 0) throw;
62        }
63        finally {
64          transaction.Dispose();
65        }
66      }
67      throw new Exception("This code should not be reached");
68    }
69
70    private TransactionScope CreateTransaction(bool serializable, bool longRunning) {
71      var options = new TransactionOptions();
72      if (serializable)
73        options.IsolationLevel = IsolationLevel.Serializable;
74      else
75        options.IsolationLevel = IsolationLevel.ReadUncommitted;
76
77      if (longRunning)
78        options.Timeout = Settings.Default.LongRunningDatabaseCommandTimeout;
79
80      return new TransactionScope(TransactionScopeOption.Required, options);
81    }
82  }
83}
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