/// <summary>
/// Take evidence from the given <see cref="HttpContext"/> and
/// pass it into the action <see cref="IPipeline"/>.
/// Add the result to the <see cref="HttpContext.Items"/>
/// collection for downstream components to use.
/// </summary>
/// <param name="context">
/// The current <see cref="HttpContext"/>
/// </param>
/// <exception cref="ArgumentNullException">
/// Thrown if one of the required arguments is null
/// </exception>
public void Process(HttpContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
// Create the flowData
var flowData = _pipeline.CreateFlowData();
context.Response.RegisterForDispose(flowData);
// Extract the required pieces of evidence from the request
_evidenceService.AddEvidenceFromRequest(flowData, context.Request);
// Start processing the data
flowData.Process();
// Remove the existing flow data if there is one.
// This will be from a previous request and the evidence may have
// changed so we need to update it.
if (context.Items.ContainsKey(Constants.HTTPCONTEXT_FLOWDATA))
{
context.Items.Remove(Constants.HTTPCONTEXT_FLOWDATA);
}
// Store the FlowData in the HttpContext
context.Items.Add(Constants.HTTPCONTEXT_FLOWDATA, flowData);
}
public IActionResult Index()
{
using (var flowData = _pipeline.CreateFlowData())
{
// Add evidence
_evidenceService.AddEvidenceFromRequest(flowData, Request);
// Process
flowData.Process();
// Set response headers
SetHeaderService.SetHeaders(Response.HttpContext, flowData);
// Send results to view
return(View(flowData));
}
}
public IActionResult Index()
{
var flowData = _pipeline.CreateFlowData();
// Register the flow data instance for disposal
// when the response is sent.
// If we just have a 'using' block then it will
// be disposed before the view can access the
// values that it needs.
HttpContext.Response.RegisterForDispose(flowData);
// Add evidence
_evidenceService.AddEvidenceFromRequest(flowData, Request);
// Process
flowData.Process();
// Set response headers
SetHeaderService.SetHeaders(Response.HttpContext, flowData);
// Send results to view
return(View(flowData));
}
