Akonadi

dbdeadlockcatcher.h
1/*
2 SPDX-FileCopyrightText: 2019 David Faure <faure@kde.org>
3
4 SPDX-License-Identifier: LGPL-2.0-or-later
5*/
6
7#pragma once
8
9#include "dbexception.h"
10
11namespace Akonadi
12{
13namespace Server
14{
15/**
16 This class catches DbDeadlockException (as emitted by QueryBuilder)
17 and retries execution of the method when it happens, as required by
18 SQL databases.
19*/
21{
22public:
23 template<typename Func>
24 explicit DbDeadlockCatcher(Func &&func)
25 {
26 callFunc(func, 0);
27 }
28
29private:
30 static const int MaxRecursion = 5;
31 template<typename Func>
32 void callFunc(Func &&func, int recursionCounter)
33 {
34 try {
35 func();
36 } catch (const DbDeadlockException &) {
37 if (recursionCounter == MaxRecursion) {
38 throw;
39 } else {
40 callFunc(func, ++recursionCounter); // recurse
41 }
42 }
43 }
44};
45
46} // namespace Server
47} // namespace Akonadi
This class catches DbDeadlockException (as emitted by QueryBuilder) and retries execution of the meth...
Helper integration between Akonadi and Qt.
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