![]() They bring about asynchronous processing which ensures that, unlike the typical request/response synchronous pattern, producers can carry on with other tasks after making the request and do not have to wait for a response to be received before doing any other work.You can add more consumers to speed up the rate of processing. By hosting producers and consumers on separate machines and decoupling them, it is easy to scale each side of the message queue separately.Because producers and consumers are independent components, they can be implemented in different languages.Now that we understand the responsibility of message queues and how they work with message producers and consumers, let's take a look at some of the advantages of using message queues. In a well-decoupled system, a consumer should know nothing about the producer and only depend on valid messages that the queue delivers to it. Most consumers are completely independent components that often only specialize in performing a single task, for example, an email service that receives email requests and its sole responsibility is to send emails to different addresses. ![]() Producers and consumers are decoupled and exist separately, but the producer has a dependency on the consumer. The producer must send messages in the format (JSON or XML) and structure expected by the consumer as message queues do not perform message transformation. Producers and consumers function as independent systems and the only contract that exists between them is the message format with which they are to communicate. In an architecture that is designed to scale easily, producers and consumers run as separate processes and are often hosted on separate machines. You and your friends (message producers) place your orders (message requests) and deliver them to the waiter (message queue) who holds and delivers all the orders to the kitchen (message consumer), where the actual preparation of the meals you ordered takes place. Think of this like making an order at a restaurant. Message producers create messages which are buffered by the message queue and delivered to the message consumers, who then perform the asynchronous processing on behalf of the producer. Let's take a look at message producers and consumers in more detail in the next section. A message queue arranges messages in a sequence to be delivered to the consumers who can then consume messages from the queue.The component that makes the request by adding a message to the queue is known as a message producer, while the component that picks up the messages from the queue and does the main processing is known as the message consumer. Message queues sit in between two services/layers that need to communicate with one another.Messages that cannot be consumed fast enough line up in the queue until the destination service is ready to process more messages.Message queues maintain an internal queue of messages that are distributed on schedule to the intended destination.A message is a serialized data construct, mostly in XML or JSON format, and it contains all the information required to perform the requested operation. As stated earlier, a message is sent in a request from one point to another for example, from a front-end application to a back-end API. ![]() A message queue is a component in a system's architecture that helps buffer and distribute asynchronous requests.
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