/// <summary>
/// Attempts to run the provided void method within a single database transaction
/// </summary>
/// <typeparam name="TArg1">The type of the first method argument</typeparam>
/// <typeparam name="TArg2">The type of the second method argument</typeparam>
/// <typeparam name="TArg3">The type of the third method argument</typeparam>
/// <param name="method">The method which handles the transaction. This should be static!</param>
/// <param name="saveSet"></param>
/// <param name="arg1">The first method argument</param>
/// <param name="arg2">The second method argument</param>
/// <param name="arg3">The third method argument</param>
/// <param name="numRetries">Number of times to attempt a retry if a serialisation error occurs</param>
/// <returns>Returns whatever a successful "method" call returns</returns>
protected void RunVoidQuery <TArg1, TArg2, TArg3>(Action <NpgsqlConnection, TArg1, TArg2, TArg3> method, TArg1 arg1,
TArg2 arg2, TArg3 arg3, int numRetries = DefaultNumDbRetries)
{
DecrementLifetime();
var attempts = 0;
while (true)
{
try
{
using (var conn = PgDalConnection.GetConn())
{
using (var transaction = conn.BeginTransaction(IsolationLevel.Serializable /* changed */))
{
method(transaction.Connection, arg1, arg2, arg3);
transaction.Commit();
break;
}
}
}
catch (NpgsqlException e)
{
if (!HandleNpgsqlException(e, ref attempts, numRetries))
{
throw;
}
}
}
}
/// <summary>
/// Attempts to run the provided method within a single database transaction
/// </summary>
/// <typeparam name="T">The return type of the provided method</typeparam>
/// <param name="method">The method which handles the transaction. This should be static!</param>
/// <param name="saveSet"></param>
/// <param name="numRetries">Number of times to attempt a retry if a serialisation error occurs</param>
/// <returns>Returns whatever a successful "method" call returns</returns>
protected T RunReturningQuery <T>(Func <NpgsqlConnection, T> method, int numRetries = DefaultNumDbRetries)
{
DecrementLifetime();
var attempts = 0;
while (true)
{
try
{
T ret;
using (var conn = PgDalConnection.GetConn())
{
using (var transaction = conn.BeginTransaction(IsolationLevel.Serializable /* changed */))
{
ret = method(transaction.Connection);
transaction.Commit();
}
}
return(ret);
}
catch (NpgsqlException e)
{
if (!HandleNpgsqlException(e, ref attempts, numRetries))
{
throw;
}
}
}
}
