mirror of https://github.com/ppy/osu
53 lines
2.0 KiB
C#
53 lines
2.0 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
|
|
// See the LICENCE file in the repository root for full licence text.
|
|
|
|
using System.Linq;
|
|
using Microsoft.EntityFrameworkCore;
|
|
using osu.Framework.Platform;
|
|
|
|
namespace osu.Game.Database
|
|
{
|
|
public abstract class DatabaseBackedStore
|
|
{
|
|
protected readonly Storage Storage;
|
|
|
|
protected readonly IDatabaseContextFactory ContextFactory;
|
|
|
|
/// <summary>
|
|
/// Refresh an instance potentially from a different thread with a local context-tracked instance.
|
|
/// </summary>
|
|
/// <param name="obj">The object to use as a reference when negotiating a local instance.</param>
|
|
/// <param name="lookupSource">An optional lookup source which will be used to query and populate a freshly retrieved replacement. If not provided, the refreshed object will still be returned but will not have any includes.</param>
|
|
/// <typeparam name="T">A valid EF-stored type.</typeparam>
|
|
protected void Refresh<T>(ref T obj, IQueryable<T> lookupSource = null) where T : class, IHasPrimaryKey
|
|
{
|
|
using (var usage = ContextFactory.GetForWrite())
|
|
{
|
|
var context = usage.Context;
|
|
|
|
if (context.Entry(obj).State != EntityState.Detached) return;
|
|
|
|
int id = obj.ID;
|
|
var foundObject = lookupSource?.SingleOrDefault(t => t.ID == id) ?? context.Find<T>(id);
|
|
if (foundObject != null)
|
|
obj = foundObject;
|
|
else
|
|
context.Add(obj);
|
|
}
|
|
}
|
|
|
|
protected DatabaseBackedStore(IDatabaseContextFactory contextFactory, Storage storage = null)
|
|
{
|
|
ContextFactory = contextFactory;
|
|
Storage = storage;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Perform any common clean-up tasks. Should be run when idle, or whenever necessary.
|
|
/// </summary>
|
|
public virtual void Cleanup()
|
|
{
|
|
}
|
|
}
|
|
}
|