QueryFutureManager.cs

// Description: Entity Framework Bulk Operations & Utilities (EF Bulk SaveChanges, Insert, Update, Delete, Merge | LINQ Query Cache, Deferred, Filter, IncludeFilter, IncludeOptimize | Audit)
// Website & Documentation: https://github.com/zzzprojects/Entity-Framework-Plus
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// License: https://github.com/zzzprojects/EntityFramework-Plus/blob/master/LICENSE
// More projects: http://www.zzzprojects.com/
// Copyright © ZZZ Projects Inc. 2014 - 2016. All rights reserved.

using System.Runtime.CompilerServices;
using Z.EntityFramework.Extensions;
using System;
using System.Data.Common;

#if NET45 || EFCORE

using System.Threading;
using System.Threading.Tasks;

#endif

#if EF5
using System.Data.Objects;
using System.Data.Entity;

#elif EF6
using System.Data.Entity.Core.Objects;
using System.Data.Entity;

#elif EFCORE
using Microsoft.EntityFrameworkCore;

#endif

namespace Z.EntityFramework.Plus
{
    /// <summary>Manage EF+ Query Future Configuration.</summary>
#if QUERY_INCLUDEOPTIMIZED
    internal static class QueryFutureManager
#else
    public static class QueryFutureManager
#endif
    {
        /// <summary>Static constructor.</summary>
        static QueryFutureManager()
        {
            EntityFrameworkManager.IsEntityFrameworkPlus = true;

#if EF5 || EF6
            CacheWeakFutureBatch = new ConditionalWeakTable<ObjectContext, QueryFutureBatch>();
#elif EFCORE
            CacheWeakFutureBatch = new System.Runtime.CompilerServices.ConditionalWeakTable<DbContext, QueryFutureBatch>();
#endif
        }

        /// <summary>Gets or sets a value indicating whether we allow query batch.</summary>
        /// <value>True if allow query batch, false if not.</value>
        public static bool AllowQueryBatch { get; set; } = true;

        /// <summary>Gets or sets a delegate to be invoked directly before executing the batch DbCommand.</summary>
        /// <remarks>
        /// This delegate is only invoked when queries are actually executed as a batch containing multiple queries.  
        /// i.e. When AllowQueryBatch=false or only a single query is pending, this delegate is not invoked.
        /// </remarks>
        public static Action<DbCommand> OnBatchExecuting { get; set; } = null;

        /// <summary>Gets or sets a delegate to be invoked directly after executing the batch DbCommand.</summary>
        /// <remarks>
        /// This delegate is only invoked when queries are actually executed as a batch containing multiple queries.  
        /// i.e. When AllowQueryBatch=false or only a single query is pending, this delegate is not invoked.
        /// </remarks>
        public static Action<DbCommand> OnBatchExecuted { get; set; } = null;

        /// <summary>Gets or sets the weak table used to cache future batch associated to a context.</summary>
        /// <value>The weak table used to cache future batch associated to a context.</value>
#if EF5 || EF6
        public static ConditionalWeakTable<ObjectContext, QueryFutureBatch> CacheWeakFutureBatch { get; set; }
#elif EFCORE
        public static System.Runtime.CompilerServices.ConditionalWeakTable<DbContext, QueryFutureBatch> CacheWeakFutureBatch { get; set; }
#endif

        /// <summary>Adds or gets the future batch associated to the context.</summary>
        /// <param name="context">The context used to cache the future batch.</param>
        /// <returns>The future batch associated to the context.</returns>
#if EF5 || EF6
        public static QueryFutureBatch AddOrGetBatch(ObjectContext context)
#elif EFCORE
        public static QueryFutureBatch AddOrGetBatch(DbContext context)
#endif
        {
            QueryFutureBatch futureBatch;

            if (!CacheWeakFutureBatch.TryGetValue(context, out futureBatch))
            {
                futureBatch = new QueryFutureBatch(context);
                CacheWeakFutureBatch.Add(context, futureBatch);
            }

            return futureBatch;
        }

        public static void ExecuteBatch(DbContext context)
        {
#if EF5 || EF6
            var batch = AddOrGetBatch(context.GetObjectContext());
#elif EFCORE
            var batch = AddOrGetBatch(context);
#endif
            batch.ExecuteQueries();
        }


#if NET45 || EFCORE
        public static async Task ExecuteBatchAsync(DbContext context, CancellationToken cancellationToken = default(CancellationToken))
        {
#if EF5 || EF6
            var batch = AddOrGetBatch(context.GetObjectContext());
#elif EFCORE
			var batch = AddOrGetBatch(context);
#endif
            await batch.ExecuteQueriesAsync(cancellationToken).ConfigureAwait(false);
        }
#endif
    }
}