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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Data
* File: TransactionalDbContext.cs
*
* TransactionalDbContext.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;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Storage;
using VNLib.Utils;
using VNLib.Plugins.Extensions.Data.Abstractions;
namespace VNLib.Plugins.Extensions.Data
{
/// <summary>
/// Abstract implementation of <see cref="ITransactionalDbContext"/> that provides a transactional context for database operations
/// </summary>
public abstract class TransactionalDbContext : DbContext, IAsyncDisposable, ITransactionalDbContext, IDbContextHandle
{
/// <summary>
/// <inheritdoc/>
/// </summary>
protected TransactionalDbContext()
{ }
/// <summary>
/// <inheritdoc/>
/// </summary>
protected TransactionalDbContext(DbContextOptions options) : base(options)
{ }
///<inheritdoc/>
public IDbContextTransaction? Transaction { get; set; }
///<inheritdoc/>
public async Task OpenTransactionAsync(CancellationToken cancellationToken = default)
{
//open a new transaction on the current database
this.Transaction = await base.Database.BeginTransactionAsync(cancellationToken);
}
///<inheritdoc/>
public Task CommitTransactionAsync(CancellationToken token = default)
{
return Transaction != null ? Transaction.CommitAsync(token) : Task.CompletedTask;
}
///<inheritdoc/>
public Task RollbackTransctionAsync(CancellationToken token = default)
{
return Transaction != null ? Transaction.RollbackAsync(token) : Task.CompletedTask;
}
///<inheritdoc/>
IQueryable<T> IDbContextHandle.Set<T>() => base.Set<T>();
///<inheritdoc/>
void IDbContextHandle.Add<T>(T entity) => base.Add(entity);
///<inheritdoc/>
void IDbContextHandle.Remove<T>(T entity) => base.Remove<T>(entity);
///<inheritdoc/>
public virtual void AddRange<T>(IEnumerable<T> entities) where T : class
{
DbSet<T> set = base.Set<T>();
set.AddRange(entities);
}
///<inheritdoc/>
public virtual async Task<ERRNO> SaveAndCloseAsync(bool commit, CancellationToken cancellation = default)
{
//Save db changes
ERRNO result = await base.SaveChangesAsync(cancellation);
if (commit)
{
await CommitTransactionAsync(cancellation);
}
else
{
await RollbackTransctionAsync(cancellation);
}
return result;
}
///<inheritdoc/>
public virtual void RemoveRange<T>(IEnumerable<T> entities) where T : class
{
DbSet<T> set = base.Set<T>();
set.RemoveRange(entities);
}
#pragma warning disable CA1816 // Dispose methods should call SuppressFinalize, ignore because base.Dispose() is called
///<inheritdoc/>
public sealed override void Dispose()
{
//dispose the transaction
Transaction?.Dispose();
base.Dispose();
}
///<inheritdoc/>
public override async ValueTask DisposeAsync()
{
//If transaction has been created, dispose the transaction
if (Transaction != null)
{
await Transaction.DisposeAsync();
}
await base.DisposeAsync();
}
#pragma warning restore CA1816 // Dispose methods should call SuppressFinalize
}
}
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