接続の作成/オープンが一元管理されている場合は、次のクラスでは漏れた接続を見つけることが容易になります。お楽しみください:)
/// <summary>
/// This class can help identify db connection leaks (connections that are not closed after use).
/// Usage:
/// connection = new SqlConnection(..);
/// connection.Open()
/// #if DEBUG
/// new ConnectionLeakWatcher(connection);
/// #endif
/// That's it. Don't store a reference to the watcher. It will make itself available for garbage collection
/// once it has fulfilled its purpose. Watch the visual studio debug output for details on potentially leaked connections.
/// Note that a connection could possibly just be taking its time and may eventually be closed properly despite being flagged by this class.
/// So take the output with a pinch of salt.
/// </summary>
public class ConnectionLeakWatcher : IDisposable
{
private readonly Timer _timer = null;
//Store reference to connection so we can unsubscribe from state change events
private SqlConnection _connection = null;
private static int _idCounter = 0;
private readonly int _connectionId = ++_idCounter;
public ConnectionLeakWatcher(SqlConnection connection)
{
_connection = connection;
StackTrace = Environment.StackTrace;
connection.StateChange += ConnectionOnStateChange;
System.Diagnostics.Debug.WriteLine("Connection opened " + _connectionId);
_timer = new Timer(x =>
{
//The timeout expired without the connection being closed. Write to debug output the stack trace of the connection creation to assist in pinpointing the problem
System.Diagnostics.Debug.WriteLine("Suspected connection leak with origin: {0}{1}{0}Connection id: {2}", Environment.NewLine, StackTrace, _connectionId);
//That's it - we're done. Clean up by calling Dispose.
Dispose();
}, null, 10000, Timeout.Infinite);
}
private void ConnectionOnStateChange(object sender, StateChangeEventArgs stateChangeEventArgs)
{
//Connection state changed. Was it closed?
if (stateChangeEventArgs.CurrentState == ConnectionState.Closed)
{
//The connection was closed within the timeout
System.Diagnostics.Debug.WriteLine("Connection closed " + _connectionId);
//That's it - we're done. Clean up by calling Dispose.
Dispose();
}
}
public string StackTrace { get; set; }
#region Dispose
private bool _isDisposed = false;
public void Dispose()
{
if (_isDisposed) return;
_timer.Dispose();
if (_connection != null)
{
_connection.StateChange -= ConnectionOnStateChange;
_connection = null;
}
_isDisposed = true;
}
~ConnectionLeakWatcher()
{
Dispose();
}
#endregion
}
プール内の接続より多くのユーザーがいる可能性はありますか? –
接続の参照をセッション状態または1つのhttp要求を超える有効期間を持つ別の場所に保存しますか? – Jan
いいえ、それらは開かれたばかりで、それぞれのリクエストで(おそらく)閉じられています。 – Jesse