public void CreateTableDataLoader_ShouldReturnEntityObjectDataLoaderWrapper()
{
// Setup
var sut = CreateSut();
// Exercise
ITableDataLoader actual = sut.CreateTableDataLoader(BuildTestModelTableDescription());
// Verify outcome
Assert.NotNull(actual);
Assert.IsAssignableFrom <EntityObjectDataLoaderWrapper>(actual);
}
public void CreateTableDataLoader_NotBindedTableDescription_ShouldReturnEmptyTableDataLoader()
{
// Setup
var sut = CreateSut();
// Exercise
ITableDataLoader actual = sut.CreateTableDataLoader(BuildTestModel2TableDescription());
// Verify outcome
Assert.NotNull(actual);
Assert.IsAssignableFrom <EmptyTableDataLoader>(actual);
}
/// <summary>
/// Creates a proxy for the global table data cache.
/// </summary>
/// <param name="table"> The table metadata. </param>
/// <returns> The proxy for the cache. </returns>
private CachingTableDataLoader CreateCachedData(TableDescription table)
{
if (this.wrappedTableDataLoaderFactory == null)
{
this.wrappedTableDataLoaderFactory =
this.wrappedDataLoader.CreateTableDataLoaderFactory();
}
ITableDataLoader wrappedTableDataLoader =
this.wrappedTableDataLoaderFactory.CreateTableDataLoader(table);
return(new CachingTableDataLoader(wrappedTableDataLoader));
}
/// <summary>
/// Initializes a new instance of the <see cref="CachingTableDataLoader" /> class.
/// </summary>
/// <param name="tableDataLoader">
/// The table data loader that is used to retrieve the data.
/// </param>
public CachingTableDataLoader(ITableDataLoader tableDataLoader)
{
IEnumerable <object[]> data;
if (tableDataLoader != null)
{
data = tableDataLoader.GetData();
}
else
{
data = Enumerable.Empty <object[]>();
}
this.data = data.ToArray();
}
/// <summary>
/// Initializes a new instance of the <see cref="CachingTableDataLoader" /> class.
/// </summary>
/// <param name="tableDataLoader">
/// The table data loader that is used to retrieve the data.
/// </param>
public CachingTableDataLoader(ITableDataLoader tableDataLoader)
{
IEnumerable<object[]> data;
if (tableDataLoader != null)
{
data = tableDataLoader.GetData();
}
else
{
data = Enumerable.Empty<object[]>();
}
this.data = data.ToArray();
}
/// <summary>
/// Loads the table data from the specified table data loader and materializes it
/// bases on the specified metadata.
/// </summary>
/// <param name="loaderFactory"> The loader factory. </param>
/// <param name="table"> The table metadata. </param>
/// <returns> The materialized data. </returns>
public static IEnumerable <object> Load(
ITableDataLoaderFactory loaderFactory,
DbTableInfo table)
{
List <ColumnDescription> columns = new List <ColumnDescription>();
PropertyInfo[] properties = table.EntityType.GetProperties();
Func <object, object>[] converters = new Func <object, object> [properties.Length];
for (int i = 0; i < properties.Length; i++)
{
PropertyInfo property = properties[i];
Type type = property.PropertyType;
// TODO: external
if (type == typeof(NMemory.Data.Timestamp))
{
converters[i] = ConvertTimestamp;
type = typeof(byte[]);
}
else if (type == typeof(NMemory.Data.Binary))
{
converters[i] = ConvertBinary;
type = typeof(byte[]);
}
ColumnDescription column = new ColumnDescription(property.Name, type);
columns.Add(column);
}
TableDescription tableDescription =
new TableDescription(table.TableName, columns);
ITableDataLoader loader = loaderFactory.CreateTableDataLoader(tableDescription);
// Prefetch require info/object to increase performance
Func <object[], object> initializer = table.EntityInitializer;
int columnCount = columns.Count;
// Single array to spare GC
object[] entityProperties = null;
foreach (object[] data in loader.GetData())
{
if (entityProperties == null)
{
// Initialize at the first element
entityProperties = new object[data.Length];
}
for (int i = 0; i < columnCount; i++)
{
object propertyValue = data[i];
// Use converter if required
Func <object, object> converter = converters[i];
if (converter != null)
{
propertyValue = converter.Invoke(propertyValue);
}
entityProperties[i] = propertyValue;
}
yield return(initializer.Invoke(entityProperties));
}
}
