Combination of CQRS with DDD?

Question

For most of my applications, I use the direct DDD approach, which means separating the levels of Onion Architecture, separating the domain from the infrastructure, etc. Two frequently repeated building blocks, a storage and an event bus, are as follows (simplified).

public interface IRepository<TEntity, TKey>
    where TEntity : EntityBase<TKey>
{

    void Add(TEntity entity);

}

public interface IEventBus {

    void Publish<TEvent>(TEvent @event)
        where TEvent : IEvent;

}

I recently started studying CQRS and found many similar patterns, such as repositories, events, and command buses. However, for example, repositories in CQRS are not responsible for storing / retrieving objects, but for managing aggregates and building event flows.

Now I wonder: do they both work together? Or are these completely different approaches, in which there are several common features?

Answer 1

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public interface IRepository<TEntity, TKey>
    where TEntity : EntityBase<TKey>
{

    void Add(TEntity entity);
    void Save(TEntity entity);
    TEntity retrieveByKey(TKey key);

}

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