Reduced exclusive lock durations

2023-11-19 16:17:27 +01:00
parent 575fec5727
commit 17a2a969e2
104 changed files with 881 additions and 705 deletions
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2023 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "services/database/TransactionChecker.hpp"
+
+#include <cassert>
+
+#include "services/database/Session.hpp"
+
+#if !defined(NDEBUG)
+#define LMS_CHECK_TRANSACTION_ACCESSES 1
+#else
+#define LMS_CHECK_TRANSACTION_ACCESSES 0
+#endif
+
+namespace Database
+{
+#if LMS_CHECK_TRANSACTION_ACCESSES
+    namespace
+    {
+        struct StackEntry
+        {
+            TransactionChecker::TransactionType type;
+            Wt::Dbo::Session* session{};
+        };
+
+        static thread_local std::vector<StackEntry> transactionStack;
+    }
+#endif
+
+    void TransactionChecker::pushWriteTransaction(Wt::Dbo::Session& session)
+    {
+        pushTransaction(TransactionType::Write, session);
+    }
+
+    void TransactionChecker::pushReadTransaction(Wt::Dbo::Session& session)
+    {
+        pushTransaction(TransactionType::Read, session);
+    }
+
+    void TransactionChecker::popWriteTransaction(Wt::Dbo::Session& session)
+    {
+        popTransaction(TransactionType::Write, session);
+    }
+
+    void TransactionChecker::popReadTransaction(Wt::Dbo::Session& session)
+    {
+        popTransaction(TransactionType::Read, session);
+    }
+
+    void TransactionChecker::pushTransaction(TransactionType type, Wt::Dbo::Session& session)
+    {
+#if LMS_CHECK_TRANSACTION_ACCESSES
+        assert(transactionStack.empty() || transactionStack.back().session == &session);
+        transactionStack.push_back(StackEntry{ type, &session });
+#endif // LMS_CHECK_TRANSACTION_ACCESSES
+    }
+
+    void TransactionChecker::popTransaction(TransactionType type, Wt::Dbo::Session& session)
+    {
+#if LMS_CHECK_TRANSACTION_ACCESSES
+
+        assert(!transactionStack.empty());
+        assert(transactionStack.back().type == type);
+        assert(transactionStack.back().session == &session);
+        transactionStack.pop_back();
+#endif // LMS_CHECK_TRANSACTION_ACCESSES
+
+    }
+
+    void TransactionChecker::checkWriteTransaction(Wt::Dbo::Session& session)
+    {
+        assert(!transactionStack.empty());
+        assert(transactionStack.back().type == TransactionType::Write);
+        assert(transactionStack.back().session == &session);
+    }
+
+    void TransactionChecker::checkWriteTransaction(Session& session)
+    {
+        checkWriteTransaction(session.getDboSession());
+    }
+
+    void TransactionChecker::checkReadTransaction(Wt::Dbo::Session& session)
+    {
+        assert(!transactionStack.empty());
+        assert(transactionStack.back().session == &session);
+    }
+
+    void TransactionChecker::checkReadTransaction(Session& session)
+    {
+        checkReadTransaction(session.getDboSession());
+    }
+}