Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Compilation / PreservationFileReader.cs / 1305376 / PreservationFileReader.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Web.Compilation {
using System;
using System.IO;
using System.Collections;
using System.Globalization;
using System.Xml;
using System.Security;
using System.Web.Configuration;
using System.Web.Util;
using System.Web.UI;
internal class PreservationFileReader {
private XmlNode _root;
private bool _precompilationMode;
private DiskBuildResultCache _diskCache;
private ArrayList _sourceDependencies;
internal PreservationFileReader(DiskBuildResultCache diskCache, bool precompilationMode) {
_diskCache = diskCache;
_precompilationMode = precompilationMode;
}
internal BuildResult ReadBuildResultFromFile(VirtualPath virtualPath, string preservationFile, long hashCode, bool ensureIsUpToDate) {
// Ignore if the preservation file doesn't exist
if (!FileUtil.FileExists(preservationFile)) {
Debug.Trace("PreservationFileReader", "Can't find preservation file " + Path.GetFileName(preservationFile));
return null;
}
BuildResult result = null;
try {
result = ReadFileInternal(virtualPath, preservationFile, hashCode, ensureIsUpToDate);
}
catch (SecurityException) {
// We eat all exceptions, except for SecurityException's, because they
// are ususally a sign that something is not set up correctly, and we
// don't want to lose the stack (VSWhidbey 269566)
throw;
}
catch {
if (!_precompilationMode) {
// The preservation file can't be used, so get rid of it
Util.RemoveOrRenameFile(preservationFile);
}
}
return result;
}
private BuildResult ReadFileInternal(VirtualPath virtualPath, string preservationFile, long hashCode, bool ensureIsUpToDate) {
XmlDocument doc = new XmlDocument();
doc.Load(preservationFile);
// Get the root element, and make sure it's what we expect
_root = doc.DocumentElement;
Debug.Assert(_root != null && _root.Name == "preserve", "_root != null && _root.Name == \"preserve\"");
if (_root == null || _root.Name != "preserve")
return null;
// Get the type of the BuildResult preserved in this file
string resultTypeCodeString = GetAttribute("resultType");
BuildResultTypeCode resultTypeCode = (BuildResultTypeCode)Int32.Parse(
resultTypeCodeString, CultureInfo.InvariantCulture);
// Get the config path that affects this BuildResult if one wasn't passed in.
// Note that the passed in path may be different with Sharepoint-like ghosting (VSWhidbey 343230)
if (virtualPath == null)
virtualPath = VirtualPath.Create(GetAttribute("virtualPath"));
long savedHash = 0;
string savedFileHash = null;
// Ignore dependencies in precompilation mode
if (!_precompilationMode) {
// Read the saved hash from the preservation file
string hashString = GetAttribute("hash");
Debug.Assert(hashString != null, "hashString != null");
if (hashString == null)
return null;
// Parse the saved hash string as an hex int
savedHash = Int64.Parse(hashString, NumberStyles.AllowHexSpecifier, CultureInfo.InvariantCulture);
// Read the saved file hash from the preservation file. This is the hash the represents
// the state of all the virtual files that the build result depends on.
savedFileHash = GetAttribute("filehash");
}
// Create the BuildResult accordingly
BuildResult result = BuildResult.CreateBuildResultFromCode(resultTypeCode, virtualPath);
// Ignore dependencies in precompilation mode
if (!_precompilationMode) {
ReadDependencies();
if (_sourceDependencies != null)
result.SetVirtualPathDependencies(_sourceDependencies);
result.VirtualPathDependenciesHash = savedFileHash;
// Check if the build result is up to date
bool outOfDate = false;
if (!result.IsUpToDate(virtualPath, ensureIsUpToDate)) {
Debug.Trace("PreservationFileReader", Path.GetFileName(preservationFile) +
" is out of date (IsUpToDate==false)");
outOfDate = true;
}
else {
// The virtual paths hash code was up to date, so check the
// other hash code.
// Get the current hash code
long currentHash = result.ComputeHashCode(hashCode);
// If the hash doesn't match, the preserved data is out of date
if (currentHash == 0 || currentHash != savedHash) {
outOfDate = true;
Debug.Trace("PreservationFileReader", Path.GetFileName(preservationFile) +
" is out of date (ComputeHashCode)");
}
}
if (outOfDate) {
bool gotLock = false;
try {
// We need to delete the preservation file together with the assemblies/pdbs
// under the same lock so to avoid bad interleaving where one process
// deletes the .compiled file that another process just created, orphaning
// the files generated by the other process.
// (Dev10 bug 791299)
CompilationLock.GetLock(ref gotLock);
// Give the BuildResult a chance to do some cleanup
result.RemoveOutOfDateResources(this);
// The preservation file is not useable, so delete it
File.Delete(preservationFile);
}
finally {
// Always release the mutex if we had taken it
if (gotLock) {
CompilationLock.ReleaseLock();
}
}
return null;
}
}
// Ask the BuildResult to read the data it needs
result.GetPreservedAttributes(this);
return result;
}
private void ReadDependencies() {
IEnumerator childEnumerator = _root.ChildNodes.GetEnumerator();
while (childEnumerator.MoveNext()) {
XmlNode dependenciesNode = (XmlNode)childEnumerator.Current;
if (dependenciesNode.NodeType != XmlNodeType.Element)
continue;
// verify no unrecognized attributes
Debug.Assert(dependenciesNode.Attributes.Count == 0);
switch (dependenciesNode.Name) {
case PreservationFileWriter.fileDependenciesTagName:
Debug.Assert(_sourceDependencies == null);
_sourceDependencies = ReadDependencies(dependenciesNode,
PreservationFileWriter.fileDependencyTagName);
break;
default:
Debug.Assert(false, dependenciesNode.Name);
break;
}
}
}
private ArrayList ReadDependencies(XmlNode parent, string tagName) {
ArrayList dependencies = new ArrayList();
IEnumerator childEnumerator = parent.ChildNodes.GetEnumerator();
while (childEnumerator.MoveNext()) {
XmlNode dependencyNode = (XmlNode)childEnumerator.Current;
if (dependencyNode.NodeType != XmlNodeType.Element)
continue;
Debug.Assert(dependencyNode.Name.Equals(tagName));
if (!dependencyNode.Name.Equals(tagName))
break;
string fileName = HandlerBase.RemoveAttribute(dependencyNode, "name");
Debug.Assert(fileName != null, "fileName != null");
// verify no unrecognized attributes
Debug.Assert(dependencyNode.Attributes.Count == 0);
if (fileName == null)
return null;
dependencies.Add(fileName);
}
return dependencies;
}
internal string GetAttribute(string name) {
return HandlerBase.RemoveAttribute(_root, name);
}
internal DiskBuildResultCache DiskCache {
get { return _diskCache; }
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Web.Compilation {
using System;
using System.IO;
using System.Collections;
using System.Globalization;
using System.Xml;
using System.Security;
using System.Web.Configuration;
using System.Web.Util;
using System.Web.UI;
internal class PreservationFileReader {
private XmlNode _root;
private bool _precompilationMode;
private DiskBuildResultCache _diskCache;
private ArrayList _sourceDependencies;
internal PreservationFileReader(DiskBuildResultCache diskCache, bool precompilationMode) {
_diskCache = diskCache;
_precompilationMode = precompilationMode;
}
internal BuildResult ReadBuildResultFromFile(VirtualPath virtualPath, string preservationFile, long hashCode, bool ensureIsUpToDate) {
// Ignore if the preservation file doesn't exist
if (!FileUtil.FileExists(preservationFile)) {
Debug.Trace("PreservationFileReader", "Can't find preservation file " + Path.GetFileName(preservationFile));
return null;
}
BuildResult result = null;
try {
result = ReadFileInternal(virtualPath, preservationFile, hashCode, ensureIsUpToDate);
}
catch (SecurityException) {
// We eat all exceptions, except for SecurityException's, because they
// are ususally a sign that something is not set up correctly, and we
// don't want to lose the stack (VSWhidbey 269566)
throw;
}
catch {
if (!_precompilationMode) {
// The preservation file can't be used, so get rid of it
Util.RemoveOrRenameFile(preservationFile);
}
}
return result;
}
private BuildResult ReadFileInternal(VirtualPath virtualPath, string preservationFile, long hashCode, bool ensureIsUpToDate) {
XmlDocument doc = new XmlDocument();
doc.Load(preservationFile);
// Get the root element, and make sure it's what we expect
_root = doc.DocumentElement;
Debug.Assert(_root != null && _root.Name == "preserve", "_root != null && _root.Name == \"preserve\"");
if (_root == null || _root.Name != "preserve")
return null;
// Get the type of the BuildResult preserved in this file
string resultTypeCodeString = GetAttribute("resultType");
BuildResultTypeCode resultTypeCode = (BuildResultTypeCode)Int32.Parse(
resultTypeCodeString, CultureInfo.InvariantCulture);
// Get the config path that affects this BuildResult if one wasn't passed in.
// Note that the passed in path may be different with Sharepoint-like ghosting (VSWhidbey 343230)
if (virtualPath == null)
virtualPath = VirtualPath.Create(GetAttribute("virtualPath"));
long savedHash = 0;
string savedFileHash = null;
// Ignore dependencies in precompilation mode
if (!_precompilationMode) {
// Read the saved hash from the preservation file
string hashString = GetAttribute("hash");
Debug.Assert(hashString != null, "hashString != null");
if (hashString == null)
return null;
// Parse the saved hash string as an hex int
savedHash = Int64.Parse(hashString, NumberStyles.AllowHexSpecifier, CultureInfo.InvariantCulture);
// Read the saved file hash from the preservation file. This is the hash the represents
// the state of all the virtual files that the build result depends on.
savedFileHash = GetAttribute("filehash");
}
// Create the BuildResult accordingly
BuildResult result = BuildResult.CreateBuildResultFromCode(resultTypeCode, virtualPath);
// Ignore dependencies in precompilation mode
if (!_precompilationMode) {
ReadDependencies();
if (_sourceDependencies != null)
result.SetVirtualPathDependencies(_sourceDependencies);
result.VirtualPathDependenciesHash = savedFileHash;
// Check if the build result is up to date
bool outOfDate = false;
if (!result.IsUpToDate(virtualPath, ensureIsUpToDate)) {
Debug.Trace("PreservationFileReader", Path.GetFileName(preservationFile) +
" is out of date (IsUpToDate==false)");
outOfDate = true;
}
else {
// The virtual paths hash code was up to date, so check the
// other hash code.
// Get the current hash code
long currentHash = result.ComputeHashCode(hashCode);
// If the hash doesn't match, the preserved data is out of date
if (currentHash == 0 || currentHash != savedHash) {
outOfDate = true;
Debug.Trace("PreservationFileReader", Path.GetFileName(preservationFile) +
" is out of date (ComputeHashCode)");
}
}
if (outOfDate) {
bool gotLock = false;
try {
// We need to delete the preservation file together with the assemblies/pdbs
// under the same lock so to avoid bad interleaving where one process
// deletes the .compiled file that another process just created, orphaning
// the files generated by the other process.
// (Dev10 bug 791299)
CompilationLock.GetLock(ref gotLock);
// Give the BuildResult a chance to do some cleanup
result.RemoveOutOfDateResources(this);
// The preservation file is not useable, so delete it
File.Delete(preservationFile);
}
finally {
// Always release the mutex if we had taken it
if (gotLock) {
CompilationLock.ReleaseLock();
}
}
return null;
}
}
// Ask the BuildResult to read the data it needs
result.GetPreservedAttributes(this);
return result;
}
private void ReadDependencies() {
IEnumerator childEnumerator = _root.ChildNodes.GetEnumerator();
while (childEnumerator.MoveNext()) {
XmlNode dependenciesNode = (XmlNode)childEnumerator.Current;
if (dependenciesNode.NodeType != XmlNodeType.Element)
continue;
// verify no unrecognized attributes
Debug.Assert(dependenciesNode.Attributes.Count == 0);
switch (dependenciesNode.Name) {
case PreservationFileWriter.fileDependenciesTagName:
Debug.Assert(_sourceDependencies == null);
_sourceDependencies = ReadDependencies(dependenciesNode,
PreservationFileWriter.fileDependencyTagName);
break;
default:
Debug.Assert(false, dependenciesNode.Name);
break;
}
}
}
private ArrayList ReadDependencies(XmlNode parent, string tagName) {
ArrayList dependencies = new ArrayList();
IEnumerator childEnumerator = parent.ChildNodes.GetEnumerator();
while (childEnumerator.MoveNext()) {
XmlNode dependencyNode = (XmlNode)childEnumerator.Current;
if (dependencyNode.NodeType != XmlNodeType.Element)
continue;
Debug.Assert(dependencyNode.Name.Equals(tagName));
if (!dependencyNode.Name.Equals(tagName))
break;
string fileName = HandlerBase.RemoveAttribute(dependencyNode, "name");
Debug.Assert(fileName != null, "fileName != null");
// verify no unrecognized attributes
Debug.Assert(dependencyNode.Attributes.Count == 0);
if (fileName == null)
return null;
dependencies.Add(fileName);
}
return dependencies;
}
internal string GetAttribute(string name) {
return HandlerBase.RemoveAttribute(_root, name);
}
internal DiskBuildResultCache DiskCache {
get { return _diskCache; }
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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