Use single service to provide FetchAndLockRequest

[TechnoBerry]

Background and motivation

Currently, 2 dependencies are used in the worker to create an instance of FetchAndLockRequest:

• IOptions<FetchAndLockOptions> which provides WorkerId, MaxTasks, UsePriority, AsyncResponseTimeout
• ITopicsProvider which provides set of FetchAndLockRequest.Topic. Existing implementation of this interface is implemented by converting set of HandlerMetadata to set of FetchAndLockRequest.Topic.

These 2 dependencies can be replaced with one that will allow to get an instance of FetchAndLockRequest.

Proposal

Add an interface:

interface IFetchAndLockRequestProvider
{
    FetchAndLockRequrest GetRequest();
}

Add a class:

class WorkerServiceOptions
{
    public string WorkerId { get; }
    public IEnumerable<HandlerDescriptor> HandlerDescriptors { get; }
}

Add to ICamundaWorkerBuilder a method for registering the implementation of a new interface with the following signature:

ICamundaWorkerBuilder AddFetchAndLockRequestProvider(
    Func<WorkerServiceOptions, IServiceProvider, IFetchAndLockRequestProvider> factory
);

Add an implementation of proposed interface that uses the 2 dependencies described earlier and register it in DI. Change code in DefaultCamundaWorker to use new IFetchAndLockRequestProvider.

Mark ITopicsProvider and ICamundaWorkerBuilder.AddTopicsProvider as obsolete