Multiple odata webapi controllers with the same resultset - entity-framework

Question

I need to create two odata controllers that return the same result set.
Specifically, the result sets is returned from two stored procedures, which receive a lot of parameters, and do some heavy processing on server.
Both SPs receive exact the same params and return the same data, but they accomplish the search in different ways, and I need to do this for some performance tests and comparisons.
The SPs are mapped to functions in EF.
So I need to have two odata controllers that, each of them, call a different SP, but return the same data type.
My code is as follows:
Controller 1
<Authorize>
Public Class SearchController
Inherits ODataController
Private _dc As New ModelDC
' GET odata/Search
<Queryable>
Function GetSearch(<FromURI> search As SearchParam) As IQueryable(Of SearchResult)
dim result = _dc.Search(search.Parm1, search.Param2, ...).ToList
Return result.AsQueryable
end function
Controller 2
<Authorize>
Public Class SearchV2Controller
Inherits ODataController
Private _dc As New ModelDC
' GET odata/Search
<Queryable>
Function GetSearch(<FromURI> p1 as string, <FromURI> p2 as string, ...) As IQueryable(Of SearchResult)
dim result = _dc.SearchV2(p1, p2, ...).ToList
Return result.AsQueryable
end function
And the odata route registration in WebApiConfig.Register
Dim builder As New ODataConventionModelBuilder
builder.EntitySet(Of SearchResult)("Search")
config.Routes.MapODataRoute("odata", "odata", builder.GetEdmModel())
builder = New ODataConventionModelBuilder
builder.EntitySet(Of SearchResult)("SearchV2")
config.Routes.MapODataRoute("odata", "odata", builder.GetEdmModel())
However, when I start the app, I get the following error:
Server Error in '/' Application. Exception of type
'System.OutOfMemoryException' was thrown. Description: An unhandled
exception occurred during the execution of the current web request.
Please review the stack trace for more information about the error and
where it originated in the code.
Exception Details: System.OutOfMemoryException: Exception of type
'System.OutOfMemoryException' was thrown.
Source Error:
An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.
Stack Trace:
[OutOfMemoryException: Exception of type 'System.OutOfMemoryException'
was thrown.] System.Reflection.RuntimeAssembly._nLoad(AssemblyName
fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly
locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder,
Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean
suppressSecurityChecks) +0
System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String
codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint,
StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean
throwOnFileNotFound, Boolean forIntrospection, Boolean
suppressSecurityChecks) +34
System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName
assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly,
StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean
throwOnFileNotFound, Boolean forIntrospection, Boolean
suppressSecurityChecks) +152
System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString,
Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr
pPrivHostBinder, Boolean forIntrospection) +77
System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString,
Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean
forIntrospection) +16 System.Reflection.Assembly.Load(String
assemblyString) +28
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String
assemblyName, Boolean starDirective) +38
[ConfigurationErrorsException: Exception of type
'System.OutOfMemoryException' was thrown.]
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String
assemblyName, Boolean starDirective) +736
System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory()
+217 System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo
ai) +130
System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection
compConfig) +170
System.Web.Compilation.BuildManager.GetPreStartInitMethodsFromReferencedAssemblies()
+91 System.Web.Compilation.BuildManager.CallPreStartInitMethods(String
preStartInitListPath, Boolean& isRefAssemblyLoaded) +284
System.Web.Compilation.BuildManager.ExecutePreAppStart() +153
System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager
appManager, IApplicationHost appHost, IConfigMapPathFactory
configMapPathFactory, HostingEnvironmentParameters hostingParameters,
PolicyLevel policyLevel, Exception appDomainCreationException) +521
[HttpException (0x80004005): Exception of type
'System.OutOfMemoryException' was thrown.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9930508
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context)
+101 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest
wr, HttpContext context) +254
What is the problem?
Is it the fact that both controllers are defined with the same return type?
I can, of course, create a different entity for the second SP (with exact the same structure), and map the result of each SP to different result class, and I assume that will work, but I prefer to have them both returning the same type of result.
What am I doing wrong?
Thanks
PS. I have the result converted first ToList and then returned AsQueryable because I need to support $inlinecount odata param, and EF-mapped SPs uses DataReader inside, which doesn't allow to re-enumerate the set to get the count first and then return the actual data. If anyone has a better idea to handle this, please let me know also.

Answer 1

why do you map the same route with different Edm Model? Can you merge them together as?
Dim builder As New ODataConventionModelBuilder
builder.EntitySet(Of SearchResult)("Search")
builder.EntitySet(Of SearchResult)("SearchV2")
config.Routes.MapODataRoute("odata", "odata", builder.GetEdmModel())