[6983] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[11204] | 3 | * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[6983] | 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.Transactions;
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| 24 |
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[9257] | 25 | namespace HeuristicLab.Services.Hive.DataAccess {
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| 26 | public class TransactionManager : ITransactionManager {
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| 27 | public void UseTransaction(Action call, bool repeatableRead = false, bool longRunning = false) {
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[6983] | 28 | int n = 10;
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| 29 | while (n > 0) {
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[9257] | 30 | TransactionScope transaction = CreateTransaction(repeatableRead, longRunning);
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[6983] | 31 | try {
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| 32 | call();
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| 33 | transaction.Complete();
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| 34 | n = 0;
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| 35 | }
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| 36 | catch (System.Data.SqlClient.SqlException e) {
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| 37 | n--; // probably deadlock situation, let it roll back and repeat the transaction n times
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[9257] | 38 | LogFactory.GetLogger(typeof(TransactionManager).Namespace).Log(string.Format("Exception occured, repeating transaction {0} more times. Details: {1}", n, e.ToString()));
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[6983] | 39 | if (n <= 0) throw;
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| 40 | }
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| 41 | finally {
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| 42 | transaction.Dispose();
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| 43 | }
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| 44 | }
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| 45 | }
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| 46 |
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[9257] | 47 | public T UseTransaction<T>(Func<T> call, bool repeatableRead = false, bool longRunning = false) {
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[6983] | 48 | int n = 10;
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| 49 | while (n > 0) {
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[9257] | 50 | TransactionScope transaction = CreateTransaction(repeatableRead, longRunning);
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[6983] | 51 | try {
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| 52 | T result = call();
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| 53 | transaction.Complete();
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| 54 | n = 0;
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| 55 | return result;
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| 56 | }
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| 57 | catch (System.Data.SqlClient.SqlException e) {
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| 58 | n--; // probably deadlock situation, let it roll back and repeat the transaction n times
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| 59 | LogFactory.GetLogger(typeof(TransactionManager).Namespace).Log(string.Format("Exception occured, repeating transaction {0} more times. Details: {1}", n, e.ToString()));
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| 60 | if (n <= 0) throw;
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| 61 | }
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| 62 | finally {
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| 63 | transaction.Dispose();
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| 64 | }
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| 65 | }
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| 66 | throw new Exception("This code should not be reached");
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| 67 | }
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| 68 |
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[9257] | 69 | private TransactionScope CreateTransaction(bool repeatableRead, bool longRunning) {
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[6983] | 70 | var options = new TransactionOptions();
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[9257] | 71 | if (repeatableRead)
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| 72 | options.IsolationLevel = IsolationLevel.RepeatableRead;
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[6983] | 73 | else
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| 74 | options.IsolationLevel = IsolationLevel.ReadUncommitted;
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| 75 |
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| 76 | if (longRunning)
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| 77 | options.Timeout = Settings.Default.LongRunningDatabaseCommandTimeout;
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| 78 |
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| 79 | return new TransactionScope(TransactionScopeOption.Required, options);
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| 80 | }
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| 81 | }
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| 82 | }
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