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.
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// See the LICENCE file in the repository root for full licence text.
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using System.Linq;
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using Microsoft.EntityFrameworkCore;
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using osu.Framework.Platform;
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namespace osu.Game.Database
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{
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public abstract class DatabaseBackedStore
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{
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protected readonly Storage Storage;
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protected readonly IDatabaseContextFactory ContextFactory;
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/// <summary>
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/// Refresh an instance potentially from a different thread with a local context-tracked instance.
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/// </summary>
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/// <param name="obj">The object to use as a reference when negotiating a local instance.</param>
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/// <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>
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/// <typeparam name="T">A valid EF-stored type.</typeparam>
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protected virtual void Refresh<T>(ref T obj, IQueryable<T> lookupSource = null) where T : class, IHasPrimaryKey
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{
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using (var usage = ContextFactory.GetForWrite())
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{
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var context = usage.Context;
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if (context.Entry(obj).State != EntityState.Detached) return;
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var id = obj.ID;
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var foundObject = lookupSource?.SingleOrDefault(t => t.ID == id) ?? context.Find<T>(id);
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if (foundObject != null)
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obj = foundObject;
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else
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context.Add(obj);
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}
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}
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protected DatabaseBackedStore(IDatabaseContextFactory contextFactory, Storage storage = null)
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{
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ContextFactory = contextFactory;
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Storage = storage;
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}
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/// <summary>
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/// Perform any common clean-up tasks. Should be run when idle, or whenever necessary.
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/// </summary>
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public virtual void Cleanup()
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{
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}
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}
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}
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