Binding is a link that you set up to bind a queue to an exchange (A link between a queue and an exchange).An exchange is responsible for routing the messages to different queues with the help of bindings and routing keys. Messages are not published directly to a queue instead, the producer sends messages to an exchange. The PDF processing worker (the consumer) receives the task message and starts processing the PDF.An exchange accepts the messages from the producer and routes them to correct message queues for PDF creation.The web application (the producer) sends a message to RabbitMQ that includes data from the request such as name and email.The user sends a PDF creation request to the web application.The point is, the two applications will only communicate through the messages they are sending to each other, which means the sender and receiver have low coupling. The request can be created in one programming language and handled in another programming language. The consumer can be on a totally different server than the producer or they can be located on the same server. At the same time, the producer is queueing up new messages. The consumer takes a message off the queue and starts processing the PDF. Message queueing is also good when you want to distribute a message to multiple consumers or to balance loads between workers. Message queueing allows web servers to respond to requests quickly instead of being forced to perform resource-heavy procedures on the spot that may delay response time. Messages placed onto the queue are stored until the consumer retrieves them. Software may act as a producer, or consumer, or both a consumer and a producer of messages. Other applications, called consumers, connect to the queue and subscribe to the messages to be processed. The basic architecture of a message queue is simple - there are client applications called producers that create messages and deliver them to the broker (the message queue). When the user has entered user information into the web interface, the web application will create a “PDF processing” message that includes all of the important information the user needs into a message and place it onto a queue defined in RabbitMQ. The receiving application then processes the message. The queue-manager software stores the messages until a receiving application connects and takes a message off the queue. It could, for example, have information about a process or task that should start on another application (which could even be on another server), or it could be just a simple text message. They can be used to reduce loads and delivery times of web application servers by delegating tasks that would normally take up a lot of time or resources to a third party that has no other job.Ī message can include any kind of information. In 'Program.cs' let's register 'MassTransit' and 'RabbitMQ' services.RabbitMQ is an open-source message-broker software that originally implemented the Advanced Message Queuing Protocol (AMQP) and has since been extended with a plug-in architecture to support Streaming Text Oriented Messaging Protocol, MQ Telemetry Transport, and other protocols.Ī message broker acts as a middleman for various services (e.g. Inside of this method, our logic to store the message data has been implemented. (Line: 15-23) Here implemented 'Consume' asynchronous method that's gets executed on every new message received by the queue.To make 'ProductCreatedConsumer' entity as a RabbitMQ queue consumer it must inherit the 'MassTransit.IConsumer'.Public async Task Consume(ConsumeContext context)Īwait _salesBusinessContext.SaveChangesAsync() _salesBusinessContext = salesBusinessContext Public ProductCreatedConsumer(SalesBusinessContext salesBusinessContext) Private readonly SalesBusinessContext _salesBusinessContext Public class ProductCreatedConsumer : IConsumer SalesBusiness.API/Consumer/ProductCreatedConsumer.cs: using MassTransit
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