/// <summary>
/// Called just before EF intends to call <see cref="DbConnection.BeginTransaction(IsolationLevel)" />.
/// </summary>
/// <param name="connection"> The connection. </param>
/// <param name="eventData"> Contextual information about connection and transaction. </param>
/// <param name="result">
/// Represents the current result if one exists.
/// This value will have <see cref="InterceptionResult{DbTransaction}.HasResult" /> set to <see langword="true" /> if some previous
/// interceptor suppressed execution by calling <see cref="InterceptionResult{DbTransaction}.SuppressWithResult" />.
/// This value is typically used as the return value for the implementation of this method.
/// </param>
/// <returns>
/// If <see cref="InterceptionResult{DbTransaction}.HasResult" /> is false, the EF will continue as normal.
/// If <see cref="InterceptionResult{DbTransaction}.HasResult" /> is true, then EF will suppress the operation it
/// was about to perform and use <see cref="InterceptionResult{DbTransaction}.Result" /> instead.
/// A normal implementation of this method for any interceptor that is not attempting to change the result
/// is to return the <paramref name="result" /> value passed in, often using <see cref="Task.FromResult{TResult}" />
/// </returns>
public virtual InterceptionResult <DbTransaction> TransactionStarting(
DbConnection connection,
TransactionStartingEventData eventData,
InterceptionResult <DbTransaction> result)
=> result;
/// <summary>
/// Called just before EF intends to call
/// <see cref="M:System.Data.Common.DbConnection.BeginTransactionAsync(System.Data.IsolationLevel,System.Threading.CancellationToken)" />.
/// </summary>
/// <param name="connection"> The connection. </param>
/// <param name="eventData"> Contextual information about connection and transaction. </param>
/// <param name="result">
/// Represents the current result if one exists.
/// This value will have <see cref="InterceptionResult{DbTransaction}.HasResult" /> set to <see langword="true" /> if some previous
/// interceptor suppressed execution by calling <see cref="InterceptionResult{DbTransaction}.SuppressWithResult" />.
/// This value is typically used as the return value for the implementation of this method.
/// </param>
/// <param name="cancellationToken"> The cancellation token. </param>
/// <returns>
/// If <see cref="InterceptionResult{DbTransaction}.HasResult" /> is false, the EF will continue as normal.
/// If <see cref="InterceptionResult{DbTransaction}.HasResult" /> is true, then EF will suppress the operation it
/// was about to perform and use <see cref="InterceptionResult{DbTransaction}.Result" /> instead.
/// A normal implementation of this method for any interceptor that is not attempting to change the result
/// is to return the <paramref name="result" /> value passed in, often using <see cref="Task.FromResult{TResult}" />
/// </returns>
public virtual ValueTask <InterceptionResult <DbTransaction> > TransactionStartingAsync(
DbConnection connection,
TransactionStartingEventData eventData,
InterceptionResult <DbTransaction> result,
CancellationToken cancellationToken = default)
=> new ValueTask <InterceptionResult <DbTransaction> >(result);
/// <summary>
/// Called just before EF intends to call <see cref="DbConnection.BeginTransaction(IsolationLevel)" />.
/// </summary>
/// <param name="connection"> The connection. </param>
/// <param name="eventData"> Contextual information about connection and transaction. </param>
/// <param name="result">
/// The current result, or null if no result yet exists.
/// This value will be non-null if some previous interceptor suppressed creation by returning a result from
/// its implementation of this method.
/// This value is typically used as the return value for the implementation of this method.
/// </param>
/// <param name="cancellationToken"> The cancellation token. </param>
/// <returns>
/// If the <see cref="Task" /> result is null, then EF will start the transaction as normal.
/// If the <see cref="Task" /> result is non-null value, then transaction creation is suppressed and the value contained in
/// the <see cref="InterceptionResult{TResult}" /> we be used by EF instead.
/// A normal implementation of this method for any interceptor that is not attempting to change the result
/// is to return the <paramref name="result" /> value passed in, often using <see cref="Task.FromResult{TResult}" />
/// </returns>
public virtual Task <InterceptionResult <DbTransaction>?> TransactionStartingAsync(
DbConnection connection, TransactionStartingEventData eventData, InterceptionResult <DbTransaction>?result,
CancellationToken cancellationToken = default)
=> Task.FromResult(result);