private ViewCompilerWorkItem CreatePrecompiledWorkItem(string normalizedPath, CompiledViewDescriptor precompiledView)
{
// We have a precompiled view - but we're not sure that we can use it yet.
//
// We need to determine first if we have enough information to 'recompile' this view. If that's the case
// we'll create change tokens for all of the files.
//
// Then we'll attempt to validate if any of those files have different content than the original sources
// based on checksums.
if (precompiledView.Item == null || !ChecksumValidator.IsRecompilationSupported(precompiledView.Item))
{
return(new ViewCompilerWorkItem()
{
// If we don't have a checksum for the primary source file we can't recompile.
SupportsCompilation = false,
ExpirationTokens = Array.Empty <IChangeToken>(), // Never expire because we can't recompile.
Descriptor = precompiledView, // This will be used as-is.
});
}
var item = new ViewCompilerWorkItem()
{
SupportsCompilation = true,
Descriptor = precompiledView, // This might be used, if the checksums match.
// Used to validate and recompile
NormalizedPath = normalizedPath,
ExpirationTokens = new List <IChangeToken>(),
};
var checksums = precompiledView.Item.GetChecksumMetadata();
for (var i = 0; i < checksums.Count; i++)
{
// We rely on Razor to provide the right set of checksums. Trust the compiler, it has to do a good job,
// so it probably will.
item.ExpirationTokens.Add(_fileProvider.Watch(checksums[i].Identifier));
}
// We also need to create a new descriptor, because the original one doesn't have expiration tokens on
// it. These will be used by the view location cache, which is like an L1 cache for views (this class is
// the L2 cache).
item.Descriptor = new CompiledViewDescriptor()
{
ExpirationTokens = item.ExpirationTokens,
IsPrecompiled = true,
Item = precompiledView.Item,
RelativePath = precompiledView.RelativePath,
ViewAttribute = precompiledView.ViewAttribute,
};
return(item);
}
public void IsRecompilationSupported_NoChecksums_ReturnsFalse()
{
// Arrange
var item = new TestRazorCompiledItem(typeof(string), "mvc.1.0.view", "/Views/Home/Index.cstml", new object[] { });
// Act
var result = ChecksumValidator.IsRecompilationSupported(item);
// Assert
Assert.False(result);
}
public void IsRecompilationSupported_NoPrimaryChecksum_ReturnsFalse()
{
// Arrange
var item = new TestRazorCompiledItem(typeof(string), "mvc.1.0.view", "/Views/Home/Index.cstml", new object[]
{
new RazorSourceChecksumAttribute("SHA1", GetChecksum("some import"), "/Views/Home/_ViewImports.cstml"),
});
// Act
var result = ChecksumValidator.IsRecompilationSupported(item);
// Assert
Assert.False(result);
}
