1 files changed, 113 insertions, 0 deletions
diff --git a/storage/ndb/src/kernel/vm/MetaData.cpp b/storage/ndb/src/kernel/vm/MetaData.cpp
new file mode 100644
index 00000000000..51afbf21503
--- /dev/null
+++ b/storage/ndb/src/kernel/vm/MetaData.cpp
@@ -0,0 +1,113 @@
+/* Copyright (C) 2003 MySQL AB
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include "MetaData.hpp"
+#include "SimulatedBlock.hpp"
+#include <blocks/dbdict/Dbdict.hpp>
+#include <blocks/dbdih/Dbdih.hpp>
+
+// MetaData::Common
+
+MetaData::Common::Common(Dbdict& dbdict, Dbdih& dbdih) :
+  m_dbdict(dbdict),
+  m_dbdih(dbdih)
+{
+  m_lock[false] = m_lock[true] = 0;
+}
+
+// MetaData::Table
+
+// MetaData
+
+MetaData::MetaData(Common& common) :
+  m_common(common)
+{
+  m_lock[false] = m_lock[true] = 0;
+}
+
+MetaData::MetaData(SimulatedBlock* block) :
+  m_common(*block->getMetaDataCommon())
+{
+  m_lock[false] = m_lock[true] = 0;
+}
+
+MetaData::~MetaData()
+{
+  for (int i = false; i <= true; i++) {
+    assert(m_common.m_lock[i] >= m_lock[i]);
+    m_common.m_lock[i] -= m_lock[i];
+    m_lock[i] = 0;
+  }
+}
+
+int
+MetaData::lock(bool exclusive)
+{
+  if (m_common.m_lock[true] > m_lock[true]) {
+    // locked exclusively by another instance
+    return MetaData::Locked;
+  }
+  m_lock[exclusive]++;
+  m_common.m_lock[exclusive]++;
+  return 0;
+}
+
+int
+MetaData::unlock(bool exclusive)
+{
+  if (m_lock[exclusive] == 0) {
+    return MetaData::NotLocked;
+  }
+  m_lock[exclusive]--;
+  m_common.m_lock[exclusive]--;
+  return 0;
+}
+
+int
+MetaData::getTable(MetaData::Table& table, Uint32 tableId, Uint32 tableVersion)
+{
+  if (m_lock[false] + m_lock[true] == 0) {
+    return MetaData::NotLocked;
+  }
+  return m_common.m_dbdict.getMetaTable(table, tableId, tableVersion);
+}
+
+int
+MetaData::getTable(MetaData::Table& table, const char* tableName)
+{
+  if (m_lock[false] + m_lock[true] == 0) {
+    return MetaData::NotLocked;
+  }
+  return m_common.m_dbdict.getMetaTable(table, tableName);
+}
+
+int
+MetaData::getAttribute(MetaData::Attribute& attribute, const MetaData::Table& table, Uint32 attributeId)
+{
+  if (m_lock[false] + m_lock[true] == 0) {
+    return MetaData::NotLocked;
+  }
+  return m_common.m_dbdict.getMetaAttribute(attribute, table, attributeId);
+}
+
+int
+MetaData::getAttribute(MetaData::Attribute& attribute, const MetaData::Table& table, const char* attributeName)
+{
+  if (m_lock[false] + m_lock[true] == 0) {
+    return MetaData::NotLocked;
+  }
+  return m_common.m_dbdict.getMetaAttribute(attribute, table, attributeName);
+}