private async Task <PooledSession> BeginTransactionAsync(PooledSession session, TransactionOptions options, CancellationToken cancellationToken)
{
// While we're creating a transaction, it's as if we're preparing a new session - it's a period of time
// where there's already an RPC in flight, and when it completes a session will be available.
Interlocked.Increment(ref _inFlightSessionCreationCount);
var request = new BeginTransactionRequest {
Options = options
};
try
{
var transaction = await session.BeginTransactionAsync(request, Options.Timeout, cancellationToken).ConfigureAwait(false);
return(session.WithTransaction(transaction.Id, options.ModeCase));
}
finally
{
Interlocked.Decrement(ref _inFlightSessionCreationCount);
}
}
/// <summary>
/// Refreshes a session by setting executing a trivial SELECT SQL statement.
/// This is performed via the client session itself so it can update its next refresh time.
/// </summary>
private async Task RefreshAsync(PooledSession session)
{
// While we're refreshing a session, it's as if we're creating a new one - it's a period of time
// where there's already an RPC in flight, and when it completes a session will be available.
Interlocked.Increment(ref _inFlightSessionCreationCount);
try
{
await session.ExecuteSqlAsync(new ExecuteSqlRequest { Sql = "SELECT 1" }, Options.Timeout, CancellationToken.None).ConfigureAwait(false);
}
catch (RpcException e)
{
Parent._logger.Warn("Failed to refresh session. Session will be deleted.", e);
EvictSession(session);
return;
}
finally
{
Interlocked.Decrement(ref _inFlightSessionCreationCount);
}
// We now definitely don't have a transaction.
ReleaseInactiveSession(session.WithTransaction(null, ModeOneofCase.None), maybeCreateReadWriteTransaction: true);
}