//
// System.Web.HttpApplicationFactory
//
// Author:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (c) 2002,2003 Ximian, Inc. (http://www.ximian.com)
// (c) Copyright 2004-2009 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Web.UI;
using System.Web.SessionState;
using System.Web.Configuration;
using System.Threading;
using System.Web.Util;
using System.Web.Compilation;
#if TARGET_J2EE
using vmw.common;
#else
using System.CodeDom.Compiler;
#endif
namespace System.Web{
sealed class HttpApplicationFactory
{
object this_lock = new object ();
// Initialized in InitType
#if TARGET_J2EE
static HttpApplicationFactory theFactory {
get
{
HttpApplicationFactory factory = (HttpApplicationFactory)AppDomain.CurrentDomain.GetData("HttpApplicationFactory");
if (factory == null) {
lock(typeof(HttpApplicationFactory)) {
factory = (HttpApplicationFactory)AppDomain.CurrentDomain.GetData("HttpApplicationFactory");
if (factory == null) {
factory = new HttpApplicationFactory();
System.Threading.Thread.Sleep(1);
AppDomain.CurrentDomain.SetData("HttpApplicationFactory", factory);
}
}
}
return factory;
}
}
#else
static HttpApplicationFactory theFactory = new HttpApplicationFactory();
#endif
object session_end; // This is a MethodInfo
bool needs_init = true;
bool app_start_needed = true;
bool have_app_events;
Type app_type;
HttpApplicationState app_state;
Hashtable app_event_handlers;
static ArrayList watchers = new ArrayList();
static object watchers_lock = new object();
static bool app_shutdown = false;
static bool app_disabled = false;
static string[] app_browsers_files = new string[0];
static string[] default_machine_browsers_files = new string[0];
static string[] app_mono_machine_browsers_files = new string[0];
Stack available = new Stack ();
object next_free;
Stack available_for_end = new Stack ();
bool IsEventHandler (MethodInfo m)
{
int pos = m.Name.IndexOf ('_');
if (pos == -1 || (m.Name.Length - 1) <= pos)
return false;
if (m.ReturnType != typeof (void))
return false;
ParameterInfo [] pi = m.GetParameters ();
int length = pi.Length;
if (length == 0)
return true;
if (length != 2)
return false;
if (pi [0].ParameterType != typeof (object) ||
!typeof (EventArgs).IsAssignableFrom (pi [1].ParameterType))
return false;
return true;
}
void AddEvent (MethodInfo method, Hashtable appTypeEventHandlers)
{
string name = method.Name.Replace ("_On", "_");
if (appTypeEventHandlers [name] == null) {
appTypeEventHandlers [name] = method;
return;
}
MethodInfo old_method = appTypeEventHandlers [name] as MethodInfo;
ArrayList list;
if (old_method != null){
list = new ArrayList (4);
list.Add (old_method);
appTypeEventHandlers [name] = list;
} else
list = appTypeEventHandlers [name] as ArrayList;
list.Add (method);
}
ArrayList GetMethodsDeep (Type type)
{
ArrayList al = new ArrayList ();
MethodInfo[] methods = type.GetMethods (BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static | BindingFlags.FlattenHierarchy);
al.AddRange (methods);
Type t = type.BaseType;
while (t != null) {
methods = t.GetMethods (BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
al.AddRange (methods);
t = t.BaseType;
}
return al;
}
Hashtable GetApplicationTypeEvents (Type type)
{
if (have_app_events)
return app_event_handlers;
lock (this_lock) {
if (app_event_handlers != null)
return app_event_handlers;
app_event_handlers = new Hashtable ();
ArrayList methods = GetMethodsDeep (type);
Hashtable used = null;
MethodInfo m;
string mname;
foreach (object o in methods) {
m = o as MethodInfo;
if (m.DeclaringType != typeof (HttpApplication) && IsEventHandler (m)) {
mname = m.ToString ();
if (used == null)
used = new Hashtable ();
else if (used.ContainsKey (mname))
continue;
used.Add (mname, m);
AddEvent (m, app_event_handlers);
}
}
used = null;
have_app_events = true;
}
return app_event_handlers;
}
Hashtable GetApplicationTypeEvents (HttpApplication app)
{
if (have_app_events)
return app_event_handlers;
return GetApplicationTypeEvents (app.GetType ());
}
bool FireEvent (string method_name, object target, object [] args)
{
Hashtable possibleEvents = GetApplicationTypeEvents ((HttpApplication) target);
MethodInfo method = possibleEvents [method_name] as MethodInfo;
if (method == null)
return false;
if (method.GetParameters ().Length == 0)
args = null;
method.Invoke (target, args);
return true;
}
HttpApplication FireOnAppStart (HttpContext context)
{
HttpApplication app = (HttpApplication) Activator.CreateInstance (app_type, true);
context.ApplicationInstance = app;
app.SetContext (context);
object [] args = new object [] {app, EventArgs.Empty};
app.InApplicationStart = true;
FireEvent ("Application_Start", app, args);
app.InApplicationStart = false;
return app;
}
void FireOnAppEnd ()
{
if (app_type == null)
return; // we didn't even get an application
HttpApplication app = (HttpApplication) Activator.CreateInstance (app_type, true);
FireEvent ("Application_End", app, new object [] {new object (), EventArgs.Empty});
app.DisposeInternal ();
app_type = null;
}
//
// This is invoked by HttpRuntime.Dispose, when we unload an AppDomain
// To reproduce this in action, touch "global.asax" while XSP is running.
//
public static void Dispose ()
{
theFactory.FireOnAppEnd ();
}
static FileSystemWatcher CreateWatcher (string file, FileSystemEventHandler hnd, RenamedEventHandler reh)
{
FileSystemWatcher watcher = new FileSystemWatcher ();
watcher.Path = Path.GetFullPath (Path.GetDirectoryName (file));
watcher.Filter = Path.GetFileName (file);
// This will enable the Modify flag for Linux/inotify
watcher.NotifyFilter |= NotifyFilters.Size;
watcher.Changed += hnd;
watcher.Created += hnd;
watcher.Deleted += hnd;
watcher.Renamed += reh;
watcher.EnableRaisingEvents = true;
return watcher;
}
internal static void AttachEvents (HttpApplication app)
{
HttpApplicationFactory factory = theFactory;
Hashtable possibleEvents = factory.GetApplicationTypeEvents (app);
foreach (string key in possibleEvents.Keys) {
int pos = key.IndexOf ('_');
string moduleName = key.Substring (0, pos);
object target;
if (moduleName == "Application") {
target = app;
} else {
target = app.Modules [moduleName];
if (target == null)
continue;
}
string eventName = key.Substring (pos + 1);
EventInfo evt = target.GetType ().GetEvent (eventName);
if (evt == null)
continue;
string usualName = moduleName + "_" + eventName;
object methodData = possibleEvents [usualName];
if (methodData == null)
continue;
if (eventName == "End" && moduleName == "Session") {
Interlocked.CompareExchange (ref factory.session_end, methodData, null);
continue;
}
if (methodData is MethodInfo) {
factory.AddHandler (evt, target, app, (MethodInfo) methodData);
continue;
}
ArrayList list = (ArrayList) methodData;
foreach (MethodInfo method in list)
factory.AddHandler (evt, target, app, method);
}
}
void AddHandler (EventInfo evt, object target, HttpApplication app, MethodInfo method)
{
int length = method.GetParameters ().Length;
if (length == 0) {
NoParamsInvoker npi = new NoParamsInvoker (app, method);
evt.AddEventHandler (target, npi.FakeDelegate);
} else {
if (method.IsStatic) {
evt.AddEventHandler (target, Delegate.CreateDelegate (
evt.EventHandlerType, method));
} else {
evt.AddEventHandler (target, Delegate.CreateDelegate (
evt.EventHandlerType, app,
method));
}
}
}
internal static void InvokeSessionEnd (object state)
{
InvokeSessionEnd (state, null, EventArgs.Empty);
}
internal static void InvokeSessionEnd (object state, object source, EventArgs e)
{
HttpApplicationFactory factory = theFactory;
MethodInfo method = null;
HttpApplication app = null;
lock (factory.available_for_end) {
method = (MethodInfo) factory.session_end;
if (method == null)
return;
app = GetApplicationForSessionEnd ();
}
app.SetSession ((HttpSessionState) state);
try {
method.Invoke (app, new object [] {(source == null ? app : source), e});
} catch (Exception) {
// Ignore
}
RecycleForSessionEnd (app);
}
static HttpStaticObjectsCollection MakeStaticCollection (ArrayList list)
{
if (list == null || list.Count == 0)
return null;
HttpStaticObjectsCollection coll = new HttpStaticObjectsCollection ();
foreach (ObjectTagBuilder tag in list) {
coll.Add (tag);
}
return coll;
}
internal static HttpApplicationState ApplicationState {
#if TARGET_J2EE
get {
HttpApplicationFactory factory = theFactory;
if (factory.app_state == null)
factory.app_state = new HttpApplicationState (null, null);
return factory.app_state;
}
#else
get {
if (theFactory.app_state == null) {
HttpStaticObjectsCollection app = MakeStaticCollection (GlobalAsaxCompiler.ApplicationObjects);
HttpStaticObjectsCollection ses = MakeStaticCollection (GlobalAsaxCompiler.SessionObjects);
theFactory.app_state = new HttpApplicationState (app, ses);
}
return theFactory.app_state;
}
#endif
}
internal static Type AppType {
get {
return theFactory.app_type;
}
}
void InitType (HttpContext context)
{
lock (this_lock) {
if (!needs_init)
return;
try {
string physical_app_path = HttpRuntime.AppDomainAppPath;
string app_file = null;
app_file = Path.Combine (physical_app_path, "Global.asax");
if (!File.Exists (app_file)) {
app_file = Path.Combine (physical_app_path, "global.asax");
if (!File.Exists (app_file))
app_file = null;
}
#if NET_4_0
BuildManager.CallPreStartMethods ();
#endif
#if !TARGET_J2EE
AppResourcesCompiler ac = new AppResourcesCompiler (context);
ac.Compile ();
#if WEBSERVICES_DEP
AppWebReferencesCompiler awrc = new AppWebReferencesCompiler ();
awrc.Compile ();
#endif
// Todo: Generate profile properties assembly from Web.config here
AppCodeCompiler acc = new AppCodeCompiler ();
acc.Compile ();
BuildManager.AllowReferencedAssembliesCaching = true;
// Get the default machine *.browser files.
string default_machine_browsers_path = Path.Combine (HttpRuntime.MachineConfigurationDirectory, "Browsers");
default_machine_browsers_files = new string[0];
if (Directory.Exists (default_machine_browsers_path)) {
default_machine_browsers_files
= Directory.GetFiles (default_machine_browsers_path, "*.browser");
}
// Note whether there are any App_Data/Mono_Machine_Browsers/*.browser files. If there
// are we will be using them instead of the default machine *.browser files.
string app_mono_machine_browsers_path = Path.Combine (Path.Combine (physical_app_path, "App_Data"), "Mono_Machine_Browsers");
app_mono_machine_browsers_files = new string[0];
if (Directory.Exists (app_mono_machine_browsers_path)) {
app_mono_machine_browsers_files
= Directory.GetFiles (app_mono_machine_browsers_path, "*.browser");
}
// Note whether there are any App_Browsers/*.browser files. If there
// are we will be using *.browser files for sniffing in addition to browscap.ini
string app_browsers_path = Path.Combine (physical_app_path, "App_Browsers");
app_browsers_files = new string[0];
if (Directory.Exists (app_browsers_path)) {
app_browsers_files = Directory.GetFiles (app_browsers_path, "*.browser");
}
#endif
app_type = BuildManager.GetPrecompiledApplicationType ();
if (app_type == null && app_file != null) {
#if TARGET_J2EE
app_file = System.Web.Util.UrlUtils.ResolveVirtualPathFromAppAbsolute("~/" + Path.GetFileName(app_file));
app_type = System.Web.J2EE.PageMapper.GetObjectType(context, app_file);
#else
app_type = BuildManager.GetCompiledType ("~/" + Path.GetFileName (app_file));
#endif
if (app_type == null) {
string msg = String.Format ("Error compiling application file ({0}).", app_file);
throw new ApplicationException (msg);
}
} else if (app_type == null) {
app_type = typeof (System.Web.HttpApplication);
app_state = new HttpApplicationState ();
}
WatchLocationForRestart ("?lobal.asax");
#if CODE_DISABLED_UNTIL_SYSTEM_CONFIGURATION_IS_FIXED
// This is the correct behavior, but until
// System.Configuration is fixed to properly reload
// configuration when it is modified on disk, we need to use
// the recursive watchers below.
WatchLocationForRestart ("?eb.?onfig");
#else
// This is to avoid startup delays. Inotify/FAM code looks
// recursively for all subdirectories and adds them to the
// watch set. This can take a lot of time for deep directory
// trees (see bug #490497)
ThreadPool.QueueUserWorkItem (new WaitCallback (SetUpWebConfigWatchers), null);
#endif
needs_init = false;
} catch (Exception) {
if (BuildManager.CodeAssemblies != null)
BuildManager.CodeAssemblies.Clear ();
if (BuildManager.TopLevelAssemblies != null)
BuildManager.TopLevelAssemblies.Clear ();
if (WebConfigurationManager.ExtraAssemblies != null)
WebConfigurationManager.ExtraAssemblies.Clear ();
throw;
}
}
}
static void SetUpWebConfigWatchers (object state)
{
WatchLocationForRestart (String.Empty, "?eb.?onfig", true);
}
//
// Multiple-threads might hit this one on startup, and we have
// to delay-initialize until we have the HttpContext
//
internal static HttpApplication GetApplication (HttpContext context)
{
#if TARGET_J2EE
if (context.ApplicationInstance!=null)
return context.ApplicationInstance;
#endif
HttpApplicationFactory factory = theFactory;
HttpApplication app = null;
if (factory.app_start_needed){
if (context == null)
return null;
factory.InitType (context);
lock (factory) {
if (factory.app_start_needed) {
foreach (string dir in HttpApplication.BinDirs)
WatchLocationForRestart (dir, "*.dll");
// Restart if the App_* directories are created...
WatchLocationForRestart (".", "App_Code");
WatchLocationForRestart (".", "App_Browsers");
WatchLocationForRestart (".", "App_GlobalResources");
// ...or their contents is changed.
WatchLocationForRestart ("App_Code", "*", true);
WatchLocationForRestart ("App_Browsers", "*");
WatchLocationForRestart ("App_GlobalResources", "*");
app = factory.FireOnAppStart (context);
factory.app_start_needed = false;
return app;
}
}
}
app = (HttpApplication) Interlocked.Exchange (ref factory.next_free, null);
if (app != null) {
app.RequestCompleted = false;
return app;
}
lock (factory.available) {
if (factory.available.Count > 0) {
app = (HttpApplication) factory.available.Pop ();
app.RequestCompleted = false;
return app;
}
}
return (HttpApplication) Activator.CreateInstance (factory.app_type, true);
}
// The lock is in InvokeSessionEnd
static HttpApplication GetApplicationForSessionEnd ()
{
HttpApplicationFactory factory = theFactory;
if (factory.available_for_end.Count > 0)
return (HttpApplication) factory.available_for_end.Pop ();
HttpApplication app = (HttpApplication) Activator.CreateInstance (factory.app_type, true);
app.InitOnce (false);
return app;
}
internal static void RecycleForSessionEnd (HttpApplication app)
{
bool dispose = false;
HttpApplicationFactory factory = theFactory;
lock (factory.available_for_end) {
if (factory.available_for_end.Count < 64)
factory.available_for_end.Push (app);
else
dispose = true;
}
if (dispose)
app.Dispose ();
}
internal static void Recycle (HttpApplication app)
{
bool dispose = false;
HttpApplicationFactory factory = theFactory;
if (Interlocked.CompareExchange (ref factory.next_free, app, null) == null)
return;
lock (factory.available) {
if (factory.available.Count < 64)
factory.available.Push (app);
else
dispose = true;
}
if (dispose)
app.Dispose ();
}
internal static bool ContextAvailable {
get { return theFactory != null && !theFactory.app_start_needed; }
}
internal static bool WatchLocationForRestart (string filter)
{
return WatchLocationForRestart (String.Empty, filter, false);
}
internal static bool WatchLocationForRestart (string virtualPath, string filter)
{
return WatchLocationForRestart (virtualPath, filter, false);
}
internal static bool WatchLocationForRestart(string virtualPath, string filter, bool watchSubdirs)
{
// map the path to the physical one
string physicalPath = HttpRuntime.AppDomainAppPath;
physicalPath = Path.Combine(physicalPath, virtualPath);
bool isDir = Directory.Exists(physicalPath);
bool isFile = isDir ? false : File.Exists(physicalPath);
if (isDir || isFile) {
// create the watcher
FileSystemEventHandler fseh = new FileSystemEventHandler(OnFileChanged);
RenamedEventHandler reh = new RenamedEventHandler(OnFileRenamed);
FileSystemWatcher watcher = CreateWatcher(Path.Combine(physicalPath, filter), fseh, reh);
if (isDir)
watcher.IncludeSubdirectories = watchSubdirs;
lock (watchers_lock) {
watchers.Add(watcher);
}
return true;
} else {
return false;
}
}
internal static bool ApplicationDisabled {
get { return app_disabled; }
set { app_disabled = value; }
}
internal static string[] AppBrowsersFiles {
get { return app_browsers_files; }
}
static System.Web.Configuration.nBrowser.Build capabilities_processor = null;
static object capabilities_processor_lock = new object();
internal static System.Web.Configuration.ICapabilitiesProcess CapabilitiesProcessor {
get {
lock (capabilities_processor_lock) {
if (capabilities_processor == null) {
capabilities_processor = new System.Web.Configuration.nBrowser.Build();
string[] machine_browsers_files = app_mono_machine_browsers_files;
if (machine_browsers_files.Length == 0) {
machine_browsers_files = default_machine_browsers_files;
}
foreach (string f in machine_browsers_files) {
capabilities_processor.AddBrowserFile(f);
}
foreach (string f in app_browsers_files) {
capabilities_processor.AddBrowserFile(f);
}
}
}
return capabilities_processor;
}
}
internal static void DisableWatchers ()
{
lock (watchers_lock) {
foreach (FileSystemWatcher watcher in watchers)
watcher.EnableRaisingEvents = false;
}
}
internal static void DisableWatcher (string virtualPath, string filter)
{
EnableWatcherEvents (virtualPath, filter, false);
}
internal static void EnableWatcher (string virtualPath, string filter)
{
EnableWatcherEvents (virtualPath, filter, true);
}
static void EnableWatcherEvents (string virtualPath, string filter, bool enable)
{
lock (watchers_lock) {
foreach (FileSystemWatcher watcher in watchers) {
if (String.Compare (watcher.Path, virtualPath, StringComparison.Ordinal) != 0 || String.Compare (watcher.Filter, filter, StringComparison.Ordinal) != 0)
continue;
watcher.EnableRaisingEvents = enable;
}
}
}
internal static void EnableWatchers ()
{
lock (watchers_lock) {
foreach (FileSystemWatcher watcher in watchers)
watcher.EnableRaisingEvents = true;
}
}
static void OnFileRenamed(object sender, RenamedEventArgs args)
{
OnFileChanged(sender, args);
}
static void OnFileChanged(object sender, FileSystemEventArgs args)
{
string name = args.Name;
bool isConfig = false;
if (StrUtils.EndsWith (name, "onfig", true)) {
if (String.Compare (Path.GetFileName (name), "web.config", true, Helpers.InvariantCulture) != 0)
return;
isConfig = true;
} else if (StrUtils.EndsWith (name, "lobal.asax", true) && String.Compare (name, "global.asax", true, Helpers.InvariantCulture) != 0)
return;
// {Inotify,FAM}Watcher will notify about events for a directory regardless
// of the filter pattern. This might be a bug in the watchers code, but
// since I couldn't find any rationale for the code in there I'd opted for
// not removing it and instead working around the issue here. Fix for bug
// #495011
FileSystemWatcher watcher = sender as FileSystemWatcher;
if (watcher != null && String.Compare (watcher.Filter, "?eb.?onfig", true, Helpers.InvariantCulture) == 0 && Directory.Exists (name))
return;
// We re-enable suppression here since WebConfigurationManager will disable
// it after save is done. WebConfigurationManager is called twice by
// Configuration - just after opening the target file and just after closing
// it. For that reason we will receive two change notifications and if we
// disabled suppression here, it would reload the application on the second
// change notification.
if (isConfig && WebConfigurationManager.SuppressAppReload (true))
return;
lock (watchers_lock) {
if(app_shutdown)
return;
app_shutdown = true;
// Disable event raising to avoid concurrent restarts
DisableWatchers ();
// Restart application
HttpRuntime.UnloadAppDomain();
}
}
}
}
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