public void Setup()
{
// See notes in TrailTest class about wiring up the repository
DirectoryCatalog repositoryCatalog = new DirectoryCatalog(@".\PlugIns");
_repositoryFactory = new RepositoryFactory();
// Now, set up the MEF container and use it to hydrate the _repositoryFactory object
_container = new CompositionContainer(repositoryCatalog);
_container.SatisfyImportsOnce(_repositoryFactory);
}
public void Setup()
{
// Options for setting up dependency injection using MEF:
// e.g. see http://msdn.microsoft.com/en-us/magazine/ee291628.aspx
// and http://buksbaum.us/2011/08/22/gentle-introduction-to-mefpart-two/
// 1. Use the TypeCatalog and explicitly reference the types - this requires a reference to the injected type,
// which kind of defeats the purpose of having it as a pluggable component
//TypeCatalog repositoryCatalog = new TypeCatalog(typeof(IRepository), typeof(EFRepository)),typeof(NHibernateRepository))
// 2. Use the Directory Catalog and point to the folder in which our executable is.
// (which in this case is likely to be C:\Projects\Personal\Trails2012\Trails2012.Tests\bin\Debug)
// NOTE: we do not (indeed, we should not) have an explicit reference to the assembly containing our plugabble repository
// NOTE: (i.e. the one that uses Entity Framework - "Trails2012.DataAccess.EF")
// NOTE: so a version of the assembly file is _not_ copied into the executing folder automatically whenever this ("Trails2102.Test") assembly is built.
// NOTE: We need to explicitly place a _current_copy of the Trails2012.DataAccess.EF.dll file into our executing folder,
// NOTE: as well as all of its dependencies
DirectoryCatalog repositoryCatalog = new DirectoryCatalog(@".\PlugIns");
// 3. Use the Directory Catalog and point to the folder which contains our pluggable component
// (which in this case is likely to be C:\Projects\Personal\Trails2012\Trails2012.DataAccess.EF\bin\Debug)
//Assembly executingAssembly = Assembly.GetExecutingAssembly();
//bool found = executingAssembly.GetCustomAttributes(typeof(DebuggableAttribute), false).Length > 0;
//string configString = (found ? "debug" : "release");
//DirectoryCatalog repositoryCatalog = new DirectoryCatalog(@"..\..\..\Trails2012.DataAccess.EF\bin\" + configString);
// 4. Use an AssemblyCatalog??? Not sure this works - it would need the pluggable component to be part of the assembly
//AssemblyCatalog repositoryCatalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
// Of course, we can use all/any of the above and combine the using an AggregateCatalog (http://mef.codeplex.com/wikipage?title=Using%20Catalogs)
// e.g. var catalog = new AggregateCatalog(
// new AssemblyCatalog(System.Reflection.Assembly.GetExecutingAssembly()),
// new DirectoryCatalog(@".\Extensions"));
// 5. Skip dependency injection and inject the repository explicitly (just for this Test assembly).
// However, to do that we need to get a reference to the pluggable repository, in which case, we would need a reference in this test assembly
// Use an internal constructor on the RepositoryFactory class and set the InternalsVisibleTo attribute of the DataAccess assembly to include this Test assembly
//EFRepository repository = new EFRepository();
//_repositoryFactory = new RepositoryFactory(repository);
// or
//_repositoryFactory = new RepositoryFactory();
// _repositoryFactory.Repository = repository;
_repositoryFactory = new RepositoryFactory();
// Now, set up the MEF container and use it to hydrate the _repositoryFactory object
_container = new CompositionContainer(repositoryCatalog);
_container.SatisfyImportsOnce(_repositoryFactory);
}
//[TestInitialize]
public void SetupRepositoryUsingMEF()
{
// It would be nice to specify a Moq wrapper of an IRepository
// and register it with MEF
// so that it gets injected into the RepositoryFactory
TypeCatalog repositoryCatalog = new TypeCatalog(typeof(IRepository), typeof(Mock<IRepository>));
_repositoryFactory = new RepositoryFactory();
_container = new CompositionContainer(repositoryCatalog);
_container.SatisfyImportsOnce(_repositoryFactory);
// However this does not work.
// It causes the following MEF error: 1) No valid exports were found that match the constraint '((exportDefinition.ContractName == "Trails2012.DataAccess.IRepository") AndAlso (exportDefinition.Metadata.ContainsKey("ExportTypeIdentity") AndAlso "Trails2012.DataAccess.IRepository".Equals(exportDefinition.Metadata.get_Item("ExportTypeIdentity"))))', invalid exports may have been rejected.
// because the Moq wrapper is not decorated with the MEF attribute:
// [Export(typeof(IRepository))]
// Hmm...I do not like that MEF requires you to decorate classes with attributes -
// other IOC containers do not do that.
// Still, no biggie. RepositoryFactory is a test-specific artifact anyway.
// Instead, we will not use MEF, but inject the IRepository manually.
// I have set the controllers up with constructors which MEF uses,
// and which take IRepository as parameter, so we can just use those constructors.
}
