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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
using System;
using System.Data;
using System.Data.Common;
namespace Apache.IoTDB.Data
{
/// <summary>
/// Represents a transaction made against a IoTDB database.
/// </summary>
public class IoTDBTransaction : DbTransaction
{
private IoTDBConnection _connection;
private readonly IsolationLevel _isolationLevel;
private bool _completed;
private bool _externalRollback;
internal IoTDBTransaction(IoTDBConnection connection, IsolationLevel isolationLevel)
{
_connection = connection;
_isolationLevel = isolationLevel;
}
/// <summary>
/// Gets the connection associated with the transaction.
/// </summary>
/// <value>The connection associated with the transaction.</value>
public new virtual IoTDBConnection Connection
=> _connection;
/// <summary>
/// Gets the connection associated with the transaction.
/// </summary>
/// <value>The connection associated with the transaction.</value>
protected override DbConnection DbConnection
=> Connection;
internal bool ExternalRollback
=> _externalRollback;
/// <summary>
/// Gets the isolation level for the transaction. This cannot be changed if the transaction is completed or
/// closed.
/// </summary>
/// <value>The isolation level for the transaction.</value>
public override IsolationLevel IsolationLevel => IsolationLevel.Unspecified;
/// <summary>
/// Applies the changes made in the transaction.
/// </summary>
public override void Commit()
{
//if (_externalRollback || _completed || _connection.State != ConnectionState.Open)
//{
// throw new InvalidOperationException(Resources.TransactionCompleted);
//}
//_connection.ExecuteNonQuery("COMMIT;");
Complete();
}
/// <summary>
/// Reverts the changes made in the transaction.
/// </summary>
public override void Rollback()
{
//if (_completed || _connection.State != ConnectionState.Open)
//{
// throw new InvalidOperationException(Resources.TransactionCompleted);
//}
RollbackInternal();
}
/// <summary>
/// Releases any resources used by the transaction and rolls it back.
/// </summary>
/// <param name="disposing">
/// true to release managed and unmanaged resources; false to release only unmanaged resources.
/// </param>
protected override void Dispose(bool disposing)
{
if (disposing
&& !_completed
&& _connection.State == ConnectionState.Open)
{
RollbackInternal();
}
}
private void Complete()
{
if (_connection != null) _connection.Transaction = null;
_connection = null;
_completed = true;
}
private void RollbackInternal()
{
Complete();
}
private void RollbackExternal(object userData)
{
_externalRollback = true;
}
}
}