protected static T GetInstance <T>() where T : DataProcessor
{
//this forces helper static constructor to be called and gets us an instance if composition worked
var instance = DPSManager.GetDataProcessor <T>() as T;
if (instance == null)
{
//if the instance is null the type was not added as part of composition
//create a new instance of T and add it to helper as a compressor
#if NETFX_CORE
var construct = (from constructor in typeof(T).GetTypeInfo().DeclaredConstructors
where constructor.GetParameters().Length == 0
select constructor).FirstOrDefault();
#else
var construct = typeof(T).GetConstructor(new Type[] { });
if (construct == null)
{
construct = typeof(T).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, new Type[0], null);
}
#endif
if (construct == null)
{
throw new Exception();
}
instance = construct.Invoke(new object[] { }) as T;
DPSManager.AddDataProcessor(instance);
}
return(instance);
}
private DPSManager()
{
//This constructor loops through referenced assemblies looking for types that inherit off of DataSerializer and
//DataProcessor. On windows this should mean perfect auto detection of serializers and compressors. On windows
//phone we cannot get a list of referenced assemblies so we can only do this for already loaded assemblies.
//Any others that are used will have to be added manually. On windows this will be done from a new app domain
//so we can unload it afterwards
//This action will perform the load in the background on some client dependent "thread"
Action loadAction = new Action(() =>
{
//Initialise the core extensions
DPSManager.GetDataSerializer <ExplicitSerializer>();
DPSManager.GetDataSerializer <NullSerializer>();
DPSManager.GetDataProcessor <DataPadder>();
#if !FREETRIAL
//Only the full version includes the encrypter
DPSManager.GetDataProcessor <RijndaelPSKEncrypter>();
#endif
#if !WINDOWS_PHONE && !NETFX_CORE
DPSManager.GetDataSerializer <BinaryFormaterSerializer>();
#endif
AssemblyLoader loader;
ProcessArgument args;
#if !WINDOWS_PHONE && !iOS && !ANDROID && !NETFX_CORE
AppDomain tempDomain = null;
try
{
//Create a new domain with the same settings as the current domain
AppDomainSetup setup = AppDomain.CurrentDomain.SetupInformation;
tempDomain = AppDomain.CreateDomain("Temp_" + Guid.NewGuid().ToString(), AppDomain.CurrentDomain.Evidence, setup);
try
{
//First try creating the proxy from the assembly using the assembly name
loader = (AssemblyLoader)tempDomain.CreateInstanceFromAndUnwrap(typeof(AssemblyLoader).Assembly.FullName, typeof(AssemblyLoader).FullName);
}
catch (FileNotFoundException)
{
//If that fails try with the assembly location. An exception here
loader = (AssemblyLoader)tempDomain.CreateInstanceFromAndUnwrap(typeof(AssemblyLoader).Assembly.Location, typeof(AssemblyLoader).FullName);
}
args = new ProcessArgument();
//If an entry assembly exists just pass that, the rest can be worked out from there.
//On WCF there is no entry assembly. In that case fill the loaded domains list with those already loaded
if (Assembly.GetEntryAssembly() != null)
{
args.loadedDomains = new List <string>()
{
Assembly.GetEntryAssembly().FullName
}
}
;
else
{
List <string> loadedDomains = new List <string>();
foreach (var ass in AppDomain.CurrentDomain.GetAssemblies())
{
loadedDomains.Add(ass.FullName);
}
args.loadedDomains = loadedDomains;
}
loader.ProcessApplicationAssemblies(args);
}
catch (FileNotFoundException)
{
//In mono, using mkbundle, the above load method may not work so we will fall back to our older way of doing the same
//The disadvantage of this approach is that all assemblies are loaded and then stay in memory increasing the footprint slightly
loader = new AssemblyLoader();
args = new ProcessArgument();
loader.ProcessApplicationAssemblies(args);
}
catch (MissingMethodException)
{
loader = new AssemblyLoader();
args = new ProcessArgument();
loader.ProcessApplicationAssemblies(args);
}
catch (Exception)
{
loader = new AssemblyLoader();
args = new ProcessArgument();
loader.ProcessApplicationAssemblies(args);
}
finally
{
if (tempDomain != null)
{
try
{
AppDomain.Unload(tempDomain);
}
catch (Exception) { }
finally
{
tempDomain = null;
GC.Collect();
}
}
}
#else
loader = new AssemblyLoader();
args = new ProcessArgument();
loader.ProcessApplicationAssemblies(args);
#endif
foreach (var serializer in args.serializerTypes)
{
lock (addRemoveObjectLocker)
{
if (!SerializersByType.ContainsKey(serializer.Value))
{
SerializersByType.Add(serializer.Value, null);
DataSerializerIdToType.Add(serializer.Key, serializer.Value);
}
}
}
foreach (var processor in args.processorTypes)
{
lock (addRemoveObjectLocker)
{
if (!DataProcessorsByType.ContainsKey(processor.Value))
{
DataProcessorsByType.Add(processor.Value, null);
DataProcessorIdToType.Add(processor.Key, processor.Value);
}
}
}
loadCompleted.Set();
});
#if NET2 || NET35
Thread loadThread = new Thread(new ThreadStart(loadAction));
loadThread.Name = "DPS load thread";
loadThread.Start();
#else
Task.Factory.StartNew(loadAction);
#endif
}