/distributed-search

Primary LanguageC#

distributed-search

Small demo for running a distributed search.

Setup

To run this demo, copy Credentials/creds.json into your home directory, and insert appropriate settings...

This will change in the future, once the app components completely run in Docker and on Kubernetes.

Business Logic

Filters

Let's say we have the following domain data types:

type FashionQuery = 
    { Size: int
      FashionType: FashionType }

type FashionItem =
    { Size: int
      FashionType: FashionType
      Price: decimal 
      Description: string
      StockKeepingUnitID : string }

We want to create a filter predicate which only let's FashionItems pass which have the right size. This filter can be implemented like this:

From scratch in C#

public class SizeFilter : IBusinessLogicFilterPredicate<ProcessingContext, FashionItem>
{
    bool IBusinessLogicFilterPredicate<ProcessingContext, FashionItem>.Matches(ProcessingContext context, FashionItem item)
        => context.Query.Size == item.Size;
}

Using a generic class in C#

new GenericFilter<ProcessingContext, FashionItem>((c,i) => c.Query.Size == i.Size)

From scratch in F#

type SizeFilter() =
    interface IBusinessLogicFilterPredicate<ProcessingContext, FashionItem> with
        member this.Matches(ctx, item) = ctx.Query.Size = item.Size

Note to self