elsa-core/src/core/Elsa.Core/ElsaOptions.cs

using System;
using Elsa.Caching;
using Elsa.Persistence;
using Elsa.Persistence.Memory;
using Elsa.Services;
using Microsoft.Extensions.DependencyInjection;
using Rebus.Config;
using Rebus.DataBus.InMem;
using Rebus.Persistence.InMem;
using Rebus.Routing.TypeBased;
using Rebus.Transport.InMem;

namespace Elsa
{
    public class ElsaOptions
    {
        public ElsaOptions(IServiceCollection services)
        {
            Services = services;

            WorkflowDefinitionStoreFactory = sp => sp.GetRequiredService<MemoryWorkflowDefinitionStore>();
            WorkflowInstanceStoreFactory = sp => sp.GetRequiredService<MemoryWorkflowInstanceStore>();
            DistributedLockProviderFactory = sp => new DefaultLockProvider();
            SignalFactory = sp => new Signal();
            ServiceBusConfigurer = ConfigureInMemoryServiceBus;
        }

        public IServiceCollection Services { get; }
        internal Func<IServiceProvider, IWorkflowDefinitionStore> WorkflowDefinitionStoreFactory { get; private set; }
        internal Func<IServiceProvider, IWorkflowInstanceStore> WorkflowInstanceStoreFactory { get; private set; }
        internal Func<IServiceProvider, IDistributedLockProvider> DistributedLockProviderFactory { get; private set; }
        internal Func<IServiceProvider, ISignal> SignalFactory { get; private set; }
        internal Func<RebusConfigurer, IServiceProvider, RebusConfigurer> ServiceBusConfigurer { get; private set; }

        public ElsaOptions UseWorkflowDefinitionStore(Func<IServiceProvider, IWorkflowDefinitionStore> factory)
        {
            WorkflowDefinitionStoreFactory = factory;
            return this;
        }

        public ElsaOptions UseWorkflowInstanceStore(Func<IServiceProvider, IWorkflowInstanceStore> factory)
        {
            WorkflowInstanceStoreFactory = factory;
            return this;
        }

        public ElsaOptions UseDistributedLockProvider(Func<IServiceProvider, IDistributedLockProvider> factory)
        {
            DistributedLockProviderFactory = factory;
            return this;
        }

        public ElsaOptions UseSignal(Func<IServiceProvider, ISignal> factory)
        {
            SignalFactory = factory;
            return this;
        }

        public ElsaOptions ConfigureServiceBus(Func<RebusConfigurer, IServiceProvider, RebusConfigurer> configure)
        {
            ServiceBusConfigurer = configure;
            return this;
        }
        
        public ElsaOptions ConfigureServiceBus(Func<RebusConfigurer, RebusConfigurer> configure) => 
            ConfigureServiceBus((bus, _) => configure(bus));

        private static RebusConfigurer ConfigureInMemoryServiceBus(RebusConfigurer rebus, IServiceProvider serviceProvider)
        {
            return rebus
                .Subscriptions(s => s.StoreInMemory(new InMemorySubscriberStore()))
                .Routing(r => r.TypeBased())
                .Transport(t => t.UseInMemoryTransport(new InMemNetwork(), "Messages"));
        }
    }
}