Question 1

How to set up CAP with RabbitMQ in .NET Core?

Accepted Answer

Install the DotNetCore.CAP.RabbitMQ package, then configure it in Startup.cs using x.UseRabbitMQ() with the host name. The README provides code snippets for various transports, and you'll need to handle the database storage separately with a package like DotNetCore.CAP.SqlServer.

Question 2

CAP vs MassTransit: which is better for microservices?

Accepted Answer

CAP is lighter and focuses on the Outbox Pattern for reliable messaging with a built-in dashboard, while MassTransit offers more advanced features like sagas and integration with more transports. Choose CAP for simplicity and guaranteed delivery, or MassTransit for complex workflow orchestration.

Question 3

Does CAP support delayed messages without a message queue?

Accepted Answer

Yes, CAP has native support for delayed messages using its internal mechanisms, so you can publish messages with a delay without depending on features like RabbitMQ's delayed exchange, as shown in the PublishDelayAsync example.

Question 4

How to monitor messages in the CAP dashboard?

Accepted Answer

Install the DotNetCore.CAP.Dashboard package and access it at the default path /cap. You can customize the path and integrate with service discovery for distributed environments, as detailed in the Dashboard section of the README.

Question 5

What databases does CAP support for outbox storage?

Accepted Answer

CAP supports SQL Server, MySQL, PostgreSQL, and MongoDB (requiring 4.0+ cluster). You need to install the respective storage package and configure it in the setup, with the event log table integrated into your chosen database.

Question 6

Is CAP suitable for high-throughput event processing?

Accepted Answer

CAP includes features like parallel processing and backpressure mechanisms for high throughput, but the Outbox Pattern adds database persistence overhead, which might bottleneck in extreme performance-critical applications compared to pure in-memory buses.

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