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// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
using System;
using System.Reflection;
using System.Threading;
using System.IO;
#if !PROJECTK_BUILD
using System.Runtime.Remoting;
#endif
public enum eReasonForUnload
{
GeneralUnload,
AssemblyLoad,
AppDomainUnload,
Replay
}
/// <summary>
/// The LoaderClass is how we communicate with other app domains. He has to do 3 important things: 1) Load assemblies into the
/// remote app domain (via Load/LoadFrom), 2) get back an object which represents the test (this is either an I...RelibilityTest or
/// a string indicating the assembly to run) (via GetTest), and 3) verify that our app domain is still running & healthy (via StillAlive)
/// </summary>
public class LoaderClass
#if !PROJECTK_BUILD
: MarshalByRefObject
#endif
{
#if !PROJECTK_BUILD
private Assembly assem;
string assembly;
#endif
public LoaderClass()
{
}
public void SuppressConsole()
{
Console.SetOut(System.IO.TextWriter.Null);
}
#if !PROJECTK_BUILD
/// <summary>
/// Executes a LoadFrom in the app domain LoaderClass has been loaded into. Attempts to load a given assembly, looking in the
/// given paths & the current directory.
/// </summary>
/// <param name="path">The assembly to load</param>
/// <param name="paths">Paths to search for the given assembly</param>
public void LoadFrom(string path, string[] paths, ReliabilityFramework rf)
{
myRf = rf;
AssemblyName an = new AssemblyName();
an.CodeBase = assembly = path;
//register AssemblyLoad and DomainUnload events
AppDomain.CurrentDomain.AssemblyLoad += new AssemblyLoadEventHandler(this.UnloadOnAssemblyLoad);
AppDomain.CurrentDomain.DomainUnload += new EventHandler(this.UnloadOnDomainUnload);
try
{
assem = Assembly.Load(an);
}
catch
{
try
{
FileInfo fi = new FileInfo(path);
an = new AssemblyName();
an.CodeBase = assembly = fi.FullName;
assem = Assembly.Load(an);
}
catch
{
if (paths != null)
{
foreach (string basePath in paths)
{
try
{
an = new AssemblyName();
an.CodeBase = assembly = ReliabilityConfig.ConvertPotentiallyRelativeFilenameToFullPath(basePath, path);
assem = Assembly.Load(an);
}
catch
{
continue;
}
break;
}
}
}
}
}
/// <summary>
/// Attempts to load an assembly w/ a simple name, looking in the given paths if a normal load fails
/// </summary>
/// <param name="assemblyName">The assembly name to load</param>
/// <param name="paths">paths to look in if the initial load fails</param>
public void Load(string assemblyName, string[] paths, ReliabilityFramework rf)
{
myRf = rf;
AssemblyName an = new AssemblyName(assemblyName);
assembly = assemblyName;
try
{
assem = Assembly.Load(an);
}
catch
{
Console.WriteLine("Load failed for: {0}", assemblyName);
LoadFrom(assemblyName, paths, rf); // couldn't load the assembly, try doing a LoadFrom with paths.
}
}
/// <summary>
/// Checks the test's entry point for an STA or MTA thread attribute. Returns
/// the apartment state if set, or ApartmentState.Unknown
/// </summary>
/// <returns></returns>
public ApartmentState CheckMainForThreadType()
{
if (assem != null)
{
MethodInfo mi = assem.EntryPoint;
object[] attrs = mi.GetCustomAttributes(typeof(STAThreadAttribute), false);
if (attrs != null && attrs.Length > 0)
{
return (ApartmentState.STA);
}
attrs = mi.GetCustomAttributes(typeof(MTAThreadAttribute), false);
if (attrs != null && attrs.Length > 0)
{
return (ApartmentState.MTA);
}
}
return (ApartmentState.Unknown);
}
#endif
/// <summary>
/// Helper function to call into the app domain and make sure that we're still functioning in a sane way.
/// </summary>
public bool StillAlive()
{
return (true);
}
#if !PROJECTK_BUILD
/// <summary>
/// Gets the full path to the loaded assembly.
/// </summary>
public string FullPath
{
get
{
return (assembly);
}
}
/// <summary>
/// Gets back the test object. If the test is an assembly (to be executed) we return a string which is the full path.
/// If we're an ISingleReliabilityTest or IMultipleReliabilityTest we return the object it's self.
/// </summary>
/// <returns>a string (executable test) or a ISingleReliabilityTest or IMultipleReliabilityTest</returns>
public Object GetTest()
{
if (assem == null)
throw new Exception("Could not load specified assembly: " + assembly);
Type[] assemTypes = null;
try
{
assemTypes = assem.GetTypes();
}
catch (System.Reflection.ReflectionTypeLoadException e)
{
if (assembly.ToLower().IndexOf(".exe") != -1)
return (assembly);
throw new Exception(String.Format("Couldn't GetTypes for {0} ({1})", assembly, e.Message));
}
// now create an instance of the correct type in the app domain
Object ourObj = null;
if (assemTypes != null)
{
foreach (Type t in assemTypes)
{
if (t.GetInterface("ISingleReliabilityTest") != null || t.GetInterface("IMultipleReliabilityTest") != null)
{
ObjectHandle handle;
if (assembly.IndexOf("\\") != -1)
handle = AppDomain.CurrentDomain.CreateInstanceFrom(assembly, t.FullName);
else if (assembly.ToLower().IndexOf(".exe") == -1 && assembly.ToLower().IndexOf(".dll") == -1)
handle = AppDomain.CurrentDomain.CreateInstance(assembly, t.FullName);
else
handle = AppDomain.CurrentDomain.CreateInstanceFrom(".\\" + assembly, t.FullName);
if (handle != null)
{
ourObj = handle.Unwrap();
break;
}
}
}
}
if (ourObj == null)
return (assembly);
if (!(ourObj is MarshalByRefObject))
throw new ArgumentException("All tests implementing ISingleReliabilityTest or IMultipleReliabilityTest must inherit from MarshalByRefObject");
return (ourObj);
}
/// <summary>
/// This stops our MBR from being deallocated by the distributed GC mechanism in remoting.
/// </summary>
/// <returns></returns>
public override Object InitializeLifetimeService()
{
return (null);
}
public void UnloadOnAssemblyLoad(object sender, AssemblyLoadEventArgs args)
{
myRf.UnloadOnEvent(AppDomain.CurrentDomain, eReasonForUnload.AssemblyLoad);
}
public void UnloadOnDomainUnload(object sender, EventArgs args)
{
myRf.UnloadOnEvent(AppDomain.CurrentDomain, eReasonForUnload.AppDomainUnload);
}
#endif
}
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