/// <summary>
/// Loads the Resource from the specified <see cref="Stream"/>. You shouldn't need this method in almost all cases.
/// Only use it when you know exactly what you're doing. Consider requesting the Resource from the <see cref="ContentProvider"/> instead.
/// </summary>
/// <typeparam name="T">
/// Desired Type of the returned reference. Does not affect the loaded Resource in any way - it is simply returned as T.
/// Results in returning null if the loaded Resource's Type isn't assignable to T.
/// </typeparam>
/// <param name="str">The stream to load the Resource from.</param>
/// <param name="resPath">The path that is assumed as the loaded Resource's origin.</param>
/// <param name="loadCallback">An optional callback that is invoked right after loading the Resource, but before initializing it.</param>
/// <param name="initResource">
/// Specifies whether or not the Resource is initialized by calling <see cref="Resource.OnLoaded"/>. Never attempt to use
/// uninitialized Resources or register them in the <see cref="ContentProvider"/>.
/// </param>
/// <returns>The Resource that has been loaded.</returns>
public static T Load <T>(Serializer formatter, string resPath = null, Action <T> loadCallback = null, bool initResource = true) where T : Resource
{
T newContent = null;
try
{
Resource res = formatter.ReadObject <Resource>();
if (res == null)
{
throw new Exception("Deserializing Resource failed.");
}
res.initState = InitState.Initializing;
res.path = resPath;
if (loadCallback != null)
{
loadCallback(res as T); // Callback before initializing.
}
if (initResource)
{
Init(res);
}
newContent = res as T;
}
catch (Exception e)
{
Logs.Core.WriteError("Can't load {0} from '{1}', because an error occurred: {3}{2}",
LogFormat.Type(typeof(T)),
resPath ?? formatter.ToString(),
LogFormat.Exception(e),
Environment.NewLine);
}
return(newContent);
}
/// <summary>
/// Returns a string that can be used for representing a <see cref="System.Reflection.TypeInfo"/> in log entries.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static string Type(TypeInfo type)
{
if (type == null)
{
return("null");
}
return(LogFormat.Type(type.AsType()));
}
public override string ToString()
{
if (this.SkipIfExists > 0)
{
return(string.Format("Skip {0} if {1} exists",
this.SkipIfExists,
LogFormat.Type(this.RequiredType)));
}
else
{
return(string.Format("Require {0} or create {1}",
LogFormat.Type(this.RequiredType),
LogFormat.Type(this.CreateType)));
}
}
/// <summary>
/// Adds an already loaded plugin Assembly to the internal Cohee T registry.
/// You shouldn't need to call this method in general, since Cohee manages its plugins
/// automatically.
/// </summary>
/// <remarks>
/// This method can be useful in certain cases when it is necessary to treat an Assembly as a
/// Cohee plugin, even though it isn't located in the Plugins folder, or is not available
/// as a file at all. A typical case for this is Unit Testing where the testing Assembly may
/// specify additional Duality types such as Components, Resources, etc.
/// </remarks>
/// <param name="pluginAssembly"></param>
/// <param name="pluginFilePath"></param>
/// <returns></returns>
public T LoadPlugin(Assembly pluginAssembly, string pluginFilePath)
{
this.disposedPlugins.Remove(pluginAssembly);
string asmName = pluginAssembly.GetShortAssemblyName();
T plugin = this.pluginRegistry.Values.FirstOrDefault(p => p.AssemblyName == asmName);
if (plugin != null)
{
return(plugin);
}
try
{
TypeInfo pluginType = pluginAssembly.ExportedTypes
.Select(t => t.GetTypeInfo())
.FirstOrDefault(t => typeof(T).GetTypeInfo().IsAssignableFrom(t));
if (pluginType == null)
{
throw new Exception(string.Format(
"Plugin does not contain a public {0} class.",
typeof(T).Name));
}
plugin = (T)pluginType.CreateInstanceOf();
if (plugin == null)
{
throw new Exception(string.Format(
"Failed to instantiate {0} class.",
LogFormat.Type(pluginType.GetType())));
}
plugin.FilePath = pluginFilePath;
plugin.FileHash = this.assemblyLoader.GetAssemblyHash(pluginFilePath);
this.pluginRegistry.Add(plugin.AssemblyName, plugin);
}
catch (Exception e)
{
this.pluginLog.WriteError("Error loading plugin: {0}", LogFormat.Exception(e));
this.disposedPlugins.Add(pluginAssembly);
plugin = null;
}
return(plugin);
}
/// <summary>
/// Returns a string that can be used for representing an exception in log entries.
/// It usually does not include the full call stack and is significantly shorter than
/// an <see cref="System.Exception">Exceptions</see> ToString method.
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
public static string Exception(Exception e, bool callStack = true)
{
if (e == null)
{
return("null");
}
string eName = LogFormat.Type(e.GetType());
return(string.Format(System.Globalization.CultureInfo.InvariantCulture,
"{0}: {1}{3}CallStack:{3}{2}",
eName,
e.Message,
e.StackTrace,
Environment.NewLine));
}
public void EnsureCreationChain(ComponentRequirementMap map)
{
if (this.initCreationChain == RecursiveInit.Initialized)
{
return;
}
if (this.initCreationChain == RecursiveInit.InProgress)
{
Logs.Core.WriteWarning(
"Detected a cyclic Component requirement in {0}. Requirements can not be ensured for cyclic dependencies.",
LogFormat.Type(this.Component));
return;
}
this.initCreationChain = RecursiveInit.InProgress;
this.InitCreationChain(map);
this.initCreationChain = RecursiveInit.Initialized;
}
/// <summary>
/// Clears the specified constraint graph of all loops.
/// </summary>
/// <param name="graph"></param>
private static void ResolveConstraintLoops(Dictionary <Type, List <OrderConstraint> > graph)
{
while (true)
{
List <OrderConstraint> loop = FindConstraintLoop(graph);
if (loop == null)
{
return;
}
// Found a loop? Find the weakest link in it
OrderConstraint weakestLink = loop[0];
for (int i = 1; i < loop.Count; i++)
{
OrderConstraint link = loop[i];
if ((int)link.Priority < (int)weakestLink.Priority)
{
weakestLink = link;
}
}
// If the loops weakest link was an explicit constraint, log a warning
if ((int)weakestLink.Priority >= (int)ConstraintPriority.ExplicitWeak)
{
Logs.Core.WriteWarning(
"Found a loop in the component execution order constraint graph. Ignoring the weakest constraint " +
"({0} must be executed before {1}). Please check your ExecutionOrder attributes.",
LogFormat.Type(weakestLink.FirstType),
LogFormat.Type(weakestLink.LastType));
}
// Remove the weakest link
List <OrderConstraint> links = graph[weakestLink.FirstType];
links.Remove(weakestLink);
if (links.Count == 0)
{
graph.Remove(weakestLink.FirstType);
}
}
}
private static CreateMethod CreateObjectActivator(TypeInfo typeInfo, out object firstResult)
{
Exception lastError = null;
CreateMethod activator;
firstResult = null;
// Filter out non-instantiatable Types
if (typeInfo.IsAbstract || typeInfo.IsInterface || typeInfo.IsGenericTypeDefinition)
{
activator = nullObjectActivator;
}
// If the caller wants a string, just return an empty one
else if (typeInfo.AsType() == typeof(string))
{
activator = () => "";
}
// If the caller wants an array, create an empty one
else if (typeInfo.IsArray && typeInfo.GetArrayRank() == 1)
{
activator = () => Array.CreateInstance(typeInfo.GetElementType(), 0);
}
// For structs, boxing a default(T) is sufficient
else if (typeInfo.IsValueType)
{
var lambda = Expression.Lambda<CreateMethod>(Expression.Convert(Expression.Default(typeInfo.AsType()), typeof(object)));
activator = lambda.Compile();
}
else
{
activator = nullObjectActivator;
// Retrieve constructors, sorted from trivial to parameter-rich
ConstructorInfo[] constructors = typeInfo.DeclaredConstructors
.Where(c => !c.IsStatic)
.Select(c => new { Info = c, ParamCount = c.GetParameters().Length })
.OrderBy(s => s.ParamCount)
.Select(s => s.Info)
.ToArray();
foreach (ConstructorInfo con in constructors)
{
// Prepare constructor argument values - just use default(T) for all of them.
ParameterInfo[] conParams = con.GetParameters();
Expression[] args = new Expression[conParams.Length];
for (int i = 0; i < args.Length; i++)
{
Type paramType = conParams[i].ParameterType;
args[i] = Expression.Default(paramType);
}
// Compile a lambda method invoking the constructor
var lambda = Expression.Lambda<CreateMethod>(Expression.New(con, args));
activator = lambda.Compile();
// Does it work?
firstResult = CheckActivator(activator, out lastError);
if (firstResult != null)
break;
}
// If there were no suitable constructors, log a generic warning.
if (constructors.Length == 0)
{
Logs.Core.WriteWarning(
"Failed to create object of Type {0}. Make sure there is a trivial constructor.",
LogFormat.Type(typeInfo));
}
}
// Test whether our activation method really works, replace with dummy if not
if (firstResult == null)
{
// If we didn't yet try to create an object instance or value, do it now.
if (lastError == null)
{
firstResult = CheckActivator(activator, out lastError);
}
// If there was an error / Exception thrown while creating the object, inform someone.
if (lastError != null)
{
// If it's a problem in a static constructor, get the inner exception to know what's actually wrong.
if (lastError is TypeInitializationException)
{
Logs.Core.WriteError("Failed to initialize Type {0}: {1}",
LogFormat.Type(typeInfo),
LogFormat.Exception(lastError.InnerException));
}
// Otherwise, just do a regular error log.
else
{
Logs.Core.WriteError("Failed to create object of Type {0}: {1}",
LogFormat.Type(typeInfo),
LogFormat.Exception(lastError));
}
}
}
// If we still don't have anything, just use a dummy.
if (firstResult == null)
activator = nullObjectActivator;
return activator;
}
internal static void InitBackend <T>(out T target, Func <Type, IEnumerable <TypeInfo> > typeFinder = null) where T : class, ICoheeBackend
{
if (typeFinder == null)
{
typeFinder = GetAvailCoheeTypes;
}
Logs.Core.Write("Initializing {0}...", LogFormat.Type(typeof(T)));
Logs.Core.PushIndent();
// Generate a list of available backends for evaluation
List <ICoheeBackend> backends = new List <ICoheeBackend>();
foreach (TypeInfo backendType in typeFinder(typeof(ICoheeBackend)))
{
if (backendType.IsInterface)
{
continue;
}
if (backendType.IsAbstract)
{
continue;
}
if (!backendType.IsClass)
{
continue;
}
if (!typeof(T).GetTypeInfo().IsAssignableFrom(backendType))
{
continue;
}
ICoheeBackend backend = backendType.CreateInstanceOf() as ICoheeBackend;
if (backend == null)
{
Logs.Core.WriteWarning("Unable to create an instance of {0}. Skipping it.", backendType.FullName);
continue;
}
backends.Add(backend);
}
// Sort backends from best to worst
backends.StableSort((a, b) => b.Priority > a.Priority ? 1 : -1);
// Try to initialize each one and select the first that works
T selectedBackend = null;
foreach (T backend in backends)
{
if (appData != null &&
appData.SkipBackends != null &&
appData.SkipBackends.Any(s => string.Equals(s, backend.Id, StringComparison.OrdinalIgnoreCase)))
{
Logs.Core.Write("Backend '{0}' skipped because of AppData settings.", backend.Name);
continue;
}
bool available = false;
try
{
available = backend.CheckAvailable();
if (!available)
{
Logs.Core.Write("Backend '{0}' reports to be unavailable. Skipping it.", backend.Name);
}
}
catch (Exception e)
{
available = false;
Logs.Core.WriteWarning("Backend '{0}' failed the availability check with an exception: {1}", backend.Name, LogFormat.Exception(e));
}
if (!available)
{
continue;
}
Logs.Core.Write("{0}...", backend.Name);
Logs.Core.PushIndent();
{
try
{
backend.Init();
selectedBackend = backend;
}
catch (Exception e)
{
Logs.Core.WriteError("Failed: {0}", LogFormat.Exception(e));
}
}
Logs.Core.PopIndent();
if (selectedBackend != null)
{
break;
}
}
// If we found a proper backend and initialized it, add it to the list of active backends
if (selectedBackend != null)
{
target = selectedBackend;
TypeInfo selectedBackendType = selectedBackend.GetType().GetTypeInfo();
corePluginManager.LockPlugin(selectedBackendType.Assembly);
}
else
{
target = null;
}
Logs.Core.PopIndent();
}
/// <summary>
/// Returns an existing <see cref="ProfileCounter"/> with the specified name.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="name">The <see cref="ProfileCounter"/> name to use for this measurement. For nested measurements, use path strings, e.g. "ParentCounter\ChildCounter"</param>
/// <returns></returns>
public static T GetCounter <T>(string name) where T : ProfileCounter
{
if (name == null)
{
return(null);
}
ProfileCounter c;
if (!counterMap.TryGetValue(name, out c))
{
return(null);
}
T cc = c as T;
if (cc == null)
{
throw new InvalidOperationException(string.Format("The specified performance counter '{0}' is not a {1}.", name, LogFormat.Type(typeof(T))));
}
return(cc);
}
