public void MoveTo_ViewBuffer_TakesPage_IfOriginalIsEmpty()
{
// Arrange
var scope = new TestViewBufferScope();
var original = new ViewBuffer(scope, "original", pageSize: 4);
var other = new ViewBuffer(scope, "other", pageSize: 4);
other.AppendHtml("Hi");
var page = other[0];
// Act
other.MoveTo(original);
// Assert
Assert.Equal(0, other.Count); // Page was taken
Assert.Equal(1, original.Count);
Assert.Same(page, original[0]);
}
[InlineData(65)] // Create many pages before clear
public void Clear_ResetsBackingBufferAndIndex(int valuesToWrite)
{
// Arrange
var buffer = new ViewBuffer(new TestViewBufferScope(), "some-name", pageSize: 32);
// Act
for (var i = 0; i < valuesToWrite; i++)
{
buffer.AppendHtml("Hello");
}
buffer.Clear();
buffer.AppendHtml("world");
// Assert
Assert.Equal(1, buffer.Count);
var page = buffer[0];
Assert.Equal(1, page.Count);
Assert.Equal("world", page.Buffer[0].Value);
}
public IHtmlContent Render()
{
var defaultActions = GetDefaultActions();
var modeViewPath = _readOnly ? DisplayTemplateViewPath : EditorTemplateViewPath;
foreach (string viewName in GetViewNames())
{
var viewEngineResult = _viewEngine.GetView(_viewContext.ExecutingFilePath, viewName, isMainPage: false);
if (!viewEngineResult.Success)
{
var fullViewName = modeViewPath + "/" + viewName;
viewEngineResult = _viewEngine.FindView(_viewContext, fullViewName, isMainPage: false);
}
if (viewEngineResult.Success)
{
var viewBuffer = new ViewBuffer(_bufferScope, viewName, ViewBuffer.PartialViewPageSize);
using (var writer = new ViewBufferTextWriter(viewBuffer, _viewContext.Writer.Encoding))
{
// Forcing synchronous behavior so users don't have to await templates.
var view = viewEngineResult.View;
using (view as IDisposable)
{
var viewContext = new ViewContext(_viewContext, viewEngineResult.View, _viewData, writer);
var renderTask = viewEngineResult.View.RenderAsync(viewContext);
renderTask.GetAwaiter().GetResult();
return(viewBuffer);
}
}
}
Func <IHtmlHelper, IHtmlContent> defaultAction;
if (defaultActions.TryGetValue(viewName, out defaultAction))
{
return(defaultAction(MakeHtmlHelper(_viewContext, _viewData)));
}
}
throw new InvalidOperationException(
Resources.FormatTemplateHelpers_NoTemplate(_viewData.ModelExplorer.ModelType.FullName));
}
public async Task Write_WritesStringValues_ToUnbufferedStream_WhenNotBuffering()
{
// Arrange
var inner = new Mock <TextWriter>();
var buffer = new ViewBuffer(new TestViewBufferScope(), "some-name", pageSize: 4);
var writer = new ViewBufferTextWriter(buffer, Encoding.UTF8, new HtmlTestEncoder(), inner.Object);
// Act
await writer.FlushAsync();
writer.Write("a");
writer.WriteLine("ab");
await writer.WriteAsync("ef");
await writer.WriteLineAsync("gh");
// Assert
inner.Verify(v => v.Write("a"), Times.Once());
inner.Verify(v => v.WriteLine("ab"), Times.Once());
inner.Verify(v => v.WriteAsync("ef"), Times.Once());
inner.Verify(v => v.WriteLineAsync("gh"), Times.Once());
}
public void MoveTo_FlattensAndClears()
{
// Arrange
var buffer = new ViewBuffer(new TestViewBufferScope(), "some-name", pageSize: 4);
var nestedItems = new List <object>();
var nested = new HtmlContentBuilder(nestedItems);
nested.AppendHtml("Hello");
buffer.AppendHtml(nested);
var destinationItems = new List <object>();
var destination = new HtmlContentBuilder(destinationItems);
// Act
buffer.MoveTo(destination);
// Assert
Assert.Empty(nestedItems);
Assert.Empty(buffer.Pages);
Assert.Equal("Hello", Assert.IsType <HtmlEncodedString>(destinationItems[0]).Value);
}
public void CopyTo_Flattens()
{
// Arrange
var buffer = new ViewBuffer(new TestViewBufferScope(), "some-name", pageSize: 4);
var nestedItems = new List <object>();
var nested = new HtmlContentBuilder(nestedItems);
nested.AppendHtml("Hello");
buffer.AppendHtml(nested);
var destinationItems = new List <object>();
var destination = new HtmlContentBuilder(destinationItems);
// Act
buffer.CopyTo(destination);
// Assert
Assert.Same(nested, buffer[0].Buffer[0].Value);
Assert.Equal("Hello", Assert.IsType <HtmlString>(nestedItems[0]).Value);
Assert.Equal("Hello", Assert.IsType <HtmlString>(destinationItems[0]).Value);
}
private void MoveTo(ViewBuffer destination)
{
for (var i = 0; i < Pages.Count; i++)
{
var page = Pages[i];
var destinationPage = destination.Pages.Count == 0 ? null : destination.Pages[destination.Pages.Count - 1];
// If the source page is less or equal to than half full, let's copy it's content to the destination
// page if possible.
var isLessThanHalfFull = 2 * page.Count <= page.Capacity;
if (isLessThanHalfFull &&
destinationPage != null &&
destinationPage.Capacity - destinationPage.Count >= page.Count)
{
// We have room, let's copy the items.
Array.Copy(
sourceArray: page.Buffer,
sourceIndex: 0,
destinationArray: destinationPage.Buffer,
destinationIndex: destinationPage.Count,
length: page.Count);
destinationPage.Count += page.Count;
// Now we can return the source page, and it can be reused in the scope of this request.
Array.Clear(page.Buffer, 0, page.Count);
_bufferScope.ReturnSegment(page.Buffer);
}
else
{
// Otherwise, let's just add the source page to the other buffer.
destination.Pages.Add(page);
}
}
Pages.Clear();
}
public async Task Write_WritesStringBuffer()
{
// Arrange
var newLine = Environment.NewLine;
var input1 = "Hello";
var input2 = "from";
var input3 = "ASP";
var input4 = ".Net";
var buffer = new ViewBuffer(new TestViewBufferScope(), "some-name", pageSize: 4);
var writer = new ViewBufferTextWriter(buffer, Encoding.UTF8);
// Act
writer.Write(input1);
writer.WriteLine(input2);
await writer.WriteAsync(input3);
await writer.WriteLineAsync(input4);
// Assert
var actual = GetValues(buffer);
Assert.Equal <object>(new[] { input1, input2, newLine, input3, input4, newLine }, actual);
}
public void MoveTo_ViewBuffer_CopiesItems_IfCurrentPageHasRoom()
{
// Arrange
var scope = new TestViewBufferScope();
var original = new ViewBuffer(scope, "original", pageSize: 4);
var other = new ViewBuffer(scope, "other", pageSize: 4);
for (var i = 0; i < 2; i++)
{
original.AppendHtml($"original-{i}");
}
// With two items, this is half full so we try to copy the items.
for (var i = 0; i < 2; i++)
{
other.AppendHtml($"other-{i}");
}
var page = other[0];
// Act
other.MoveTo(original);
// Assert
Assert.Equal(0, other.Count); // Other is cleared
Assert.Contains(page.Buffer, scope.ReturnedBuffers); // Buffer was returned
Assert.Equal(1, original.Count);
Assert.Collection(
original[0].Buffer,
item => Assert.Equal("original-0", item.Value),
item => Assert.Equal("original-1", item.Value),
item => Assert.Equal("other-0", item.Value),
item => Assert.Equal("other-1", item.Value));
}
