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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Linq.Expressions;
using System.Threading;
using JetBrains.Annotations;
using Microsoft.EntityFrameworkCore.Diagnostics;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Storage;
using Microsoft.EntityFrameworkCore.Utilities;
using Microsoft.Extensions.DependencyInjection;
#nullable enable
namespace Microsoft.EntityFrameworkCore.Query.Internal
{
/// <summary>
/// <para>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </para>
/// <para>
/// The service lifetime is <see cref="ServiceLifetime.Scoped" />. This means that each
/// <see cref="DbContext" /> instance will use its own instance of this service.
/// The implementation may depend on other services registered with any lifetime.
/// The implementation does not need to be thread-safe.
/// </para>
/// </summary>
public class QueryCompiler : IQueryCompiler
{
private readonly IQueryContextFactory _queryContextFactory;
private readonly ICompiledQueryCache _compiledQueryCache;
private readonly ICompiledQueryCacheKeyGenerator _compiledQueryCacheKeyGenerator;
private readonly IDatabase _database;
private readonly IDiagnosticsLogger<DbLoggerCategory.Query> _logger;
private readonly Type _contextType;
private readonly IEvaluatableExpressionFilter _evaluatableExpressionFilter;
private readonly IModel _model;
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public QueryCompiler(
[NotNull] IQueryContextFactory queryContextFactory,
[NotNull] ICompiledQueryCache compiledQueryCache,
[NotNull] ICompiledQueryCacheKeyGenerator compiledQueryCacheKeyGenerator,
[NotNull] IDatabase database,
[NotNull] IDiagnosticsLogger<DbLoggerCategory.Query> logger,
[NotNull] ICurrentDbContext currentContext,
[NotNull] IEvaluatableExpressionFilter evaluatableExpressionFilter,
[NotNull] IModel model)
{
Check.NotNull(queryContextFactory, nameof(queryContextFactory));
Check.NotNull(compiledQueryCache, nameof(compiledQueryCache));
Check.NotNull(compiledQueryCacheKeyGenerator, nameof(compiledQueryCacheKeyGenerator));
Check.NotNull(database, nameof(database));
Check.NotNull(logger, nameof(logger));
Check.NotNull(currentContext, nameof(currentContext));
Check.NotNull(evaluatableExpressionFilter, nameof(evaluatableExpressionFilter));
Check.NotNull(model, nameof(model));
_queryContextFactory = queryContextFactory;
_compiledQueryCache = compiledQueryCache;
_compiledQueryCacheKeyGenerator = compiledQueryCacheKeyGenerator;
_database = database;
_logger = logger;
_contextType = currentContext.Context.GetType();
_evaluatableExpressionFilter = evaluatableExpressionFilter;
_model = model;
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual TResult Execute<TResult>(Expression query)
{
Check.NotNull(query, nameof(query));
var queryContext = _queryContextFactory.Create();
query = ExtractParameters(query, queryContext, _logger);
var compiledQuery
= _compiledQueryCache
.GetOrAddQuery(
_compiledQueryCacheKeyGenerator.GenerateCacheKey(query, async: false),
() => CompileQueryCore<TResult>(_database, query, _model, false));
return compiledQuery(queryContext);
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual Func<QueryContext, TResult> CompileQueryCore<TResult>(
[NotNull] IDatabase database,
[NotNull] Expression query,
[NotNull] IModel model,
bool async)
=> database.CompileQuery<TResult>(query, async);
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual Func<QueryContext, TResult> CreateCompiledQuery<TResult>(Expression query)
{
Check.NotNull(query, nameof(query));
query = ExtractParameters(query, _queryContextFactory.Create(), _logger, parameterize: false);
return CompileQueryCore<TResult>(_database, query, _model, false);
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual TResult ExecuteAsync<TResult>(Expression query, CancellationToken cancellationToken = default)
{
Check.NotNull(query, nameof(query));
var queryContext = _queryContextFactory.Create();
queryContext.CancellationToken = cancellationToken;
query = ExtractParameters(query, queryContext, _logger);
var compiledQuery
= _compiledQueryCache
.GetOrAddQuery(
_compiledQueryCacheKeyGenerator.GenerateCacheKey(query, async: true),
() => CompileQueryCore<TResult>(_database, query, _model, true));
return compiledQuery(queryContext);
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual Func<QueryContext, TResult> CreateCompiledAsyncQuery<TResult>(Expression query)
{
Check.NotNull(query, nameof(query));
query = ExtractParameters(query, _queryContextFactory.Create(), _logger, parameterize: false);
return CompileQueryCore<TResult>(_database, query, _model, true);
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual Expression ExtractParameters(
[NotNull] Expression query,
[NotNull] IParameterValues parameterValues,
[NotNull] IDiagnosticsLogger<DbLoggerCategory.Query> logger,
bool parameterize = true,
bool generateContextAccessors = false)
{
var visitor = new ParameterExtractingExpressionVisitor(
_evaluatableExpressionFilter,
parameterValues,
_contextType,
_model,
logger,
parameterize,
generateContextAccessors);
return visitor.ExtractParameters(query);
}
}
}