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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Data
* File: DbStoreHelperExtensions.cs
*
* DbStoreHelperExtensions.cs is part of VNLib.Plugins.Extensions.Data which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Data is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Extensions.Data is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System.Threading;
using System.Transactions;
using System.Threading.Tasks;
using VNLib.Plugins.Extensions.Data.Abstractions;
namespace VNLib.Plugins.Extensions.Data.Extensions
{
internal static class DbStoreHelperExtensions
{
/// <summary>
/// If the current context instance inherits the <see cref="IConcurrentDbContext"/> interface,
/// attempts to open a transaction with the specified isolation level.
/// </summary>
/// <param name="tdb"></param>
/// <param name="isolationLevel">The transaction isolation level</param>
/// <param name="cancellationToken">A token to cancel the operation</param>
/// <returns></returns>
internal static Task OpenTransactionAsync(this ITransactionalDbContext tdb, IsolationLevel isolationLevel, CancellationToken cancellationToken = default)
{
if (tdb is IConcurrentDbContext ccdb)
{
return ccdb.OpenTransactionAsync(isolationLevel, cancellationToken);
}
else
{
//Just ignore the isolation level
return tdb.OpenTransactionAsync(cancellationToken);
}
}
/// <summary>
/// Opens a new database connection. If the context supports transactions, it will
/// open a transaction with the specified isolation level.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="store"></param>
/// <param name="level">The transaction isolation level</param>
/// <param name="cancellation">A token to cancel the transaction operation</param>
/// <returns>A task that resolves the new open <see cref="IDbContextHandle"/> </returns>
public static async Task<IDbContextHandle> OpenAsync<T>(this IDataStore<T> store, IsolationLevel level, CancellationToken cancellation = default)
where T : class, IDbModel
{
//Open new db context
IDbContextHandle ctx = store.GetNewContext();
//Support transactions and start them if the context supports it
if(ctx is ITransactionalDbContext tdb)
{
try
{
//Open transaction
await tdb.OpenTransactionAsync(level, cancellation);
}
catch
{
await ctx.DisposeAsync();
throw;
}
}
return ctx;
}
}
}
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