private bool Equals(CommandCacheKey commandCacheKey)
{
if (!ReferenceEquals(_selectExpression, commandCacheKey._selectExpression))
{
return(false);
}
if (_parameterValues.Count > 0)
{
foreach (var parameterValue in _parameterValues)
{
var value = parameterValue.Value;
if (!commandCacheKey._parameterValues.TryGetValue(parameterValue.Key, out var otherValue))
{
return(false);
}
// ReSharper disable once ArrangeRedundantParentheses
if ((value == null) != (otherValue == null))
{
return(false);
}
if (value is IEnumerable &&
value.GetType() == typeof(object[]))
{
// FromSql parameters must have the same number of elements
return(((object[])value).Length == (otherValue as object[])?.Length);
}
}
}
return(true);
}
public virtual IRelationalCommand GetRelationalCommand(IReadOnlyDictionary <string, object> parameters)
{
var cacheKey = new CommandCacheKey(_selectExpression, parameters);
retry:
if (!_memoryCache.TryGetValue(cacheKey, out IRelationalCommand relationalCommand))
{
if (!_syncObjects.TryAdd(cacheKey, value: null))
{
goto retry;
}
try
{
var(selectExpression, canCache) =
_relationalParameterBasedQueryTranslationPostprocessor.Optimize(_selectExpression, parameters);
relationalCommand = _querySqlGeneratorFactory.Create().GetCommand(selectExpression);
if (canCache)
{
_memoryCache.Set(cacheKey, relationalCommand, new MemoryCacheEntryOptions {
Size = 10
});
}
}
finally
{
_syncObjects.TryRemove(cacheKey, out _);
}
}
return(relationalCommand);
}
public virtual IRelationalCommand GetRelationalCommand(IReadOnlyDictionary <string, object> parameters)
{
var key = new CommandCacheKey(parameters);
if (_commandCache.TryGetValue(key, out var relationalCommand))
{
return(relationalCommand);
}
var selectExpression = _parameterValueBasedSelectExpressionOptimizer.Optimize(_selectExpression, parameters);
relationalCommand = _querySqlGeneratorFactory.Create().GetCommand(selectExpression);
if (ReferenceEquals(selectExpression, _selectExpression))
{
_commandCache.TryAdd(key, relationalCommand);
}
return(relationalCommand);
}
/// <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 IRelationalCommand GetRelationalCommand([NotNull] IReadOnlyDictionary <string, object> parameters)
{
var cacheKey = new CommandCacheKey(_selectExpression, parameters);
if (_memoryCache.TryGetValue(cacheKey, out IRelationalCommand relationalCommand))
{
return(relationalCommand);
}
// When multiple threads attempt to start processing the same query (program startup / thundering
// herd), have only one actually process and block the others.
// Note that the following synchronization isn't perfect - some race conditions may cause concurrent
// processing. This is benign (and rare).
var compilationLock = _locks.GetOrAdd(cacheKey, _ => new object());
try
{
lock (compilationLock)
{
if (!_memoryCache.TryGetValue(cacheKey, out relationalCommand))
{
var selectExpression = _relationalParameterBasedSqlProcessor.Optimize(
_selectExpression, parameters, out var canCache);
relationalCommand = _querySqlGeneratorFactory.Create().GetCommand(selectExpression);
if (canCache)
{
_memoryCache.Set(cacheKey, relationalCommand, new MemoryCacheEntryOptions {
Size = 10
});
}
}
return(relationalCommand);
}
}
finally
{
_locks.TryRemove(compilationLock, out _);
}
}
public virtual IRelationalCommand GetRelationalCommand(
[NotNull] IReadOnlyDictionary <string, object> parameters)
{
IRelationalCommand relationalCommand;
var key = new CommandCacheKey(parameters);
if (_commandCache.TryGetValue(key, out relationalCommand))
{
return(relationalCommand);
}
var generator = QuerySqlGeneratorFactory();
relationalCommand = generator.GenerateSql(parameters);
if (generator.IsCacheable)
{
_commandCache.TryAdd(key, relationalCommand);
}
return(relationalCommand);
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual IRelationalCommand GetRelationalCommand(
[NotNull] IReadOnlyDictionary<string, object> parameters)
{
IRelationalCommand relationalCommand;
var key = new CommandCacheKey(parameters);
if (_commandCache.TryGetValue(key, out relationalCommand))
{
return relationalCommand;
}
var generator = QuerySqlGeneratorFactory();
relationalCommand = generator.GenerateSql(parameters);
if (generator.IsCacheable)
{
_commandCache.TryAdd(key, relationalCommand);
}
return relationalCommand;
}