What is difference between request reply and publish-subscribe?
A request reply messaging model differs from a traditional pub/sub or P2P model, where a message is published to a Topic or Queue and a client can consume the message without providing a reply message in response to the publisher.
When would you use request reply and when publish-subscribe?
Pub-sub clients can publish data to the broker or subscribe to get data from it—or both. Clients that publish data send it only when the data changes (report by exception, or RBE). Clients that subscribe to data automatically receive it from the broker/server, but again, only when it changes.
How do you implement a publisher subscriber in Java?
Very simple, just put the OnMessage annotation on the method. Then you need to create a class that represent the message you send. Initialize the subscriber class so you can have a subscriber object. Subscriber subscriber = new Subscriber(1);
When not to use publish-subscribe?
Synchronous point-to-point communication between the two endpoints is the best solution for media streaming. Pub/Sub is not suitable for carrying VoIP or video telephony traffic over the Internet.
Does Kafka support pub sub?
In a very fast, reliable, persisted, fault-tolerance and zero downtime manner, Kafka offers a Pub-sub and queue-based messaging system. Moreover, producers send the message to a topic and the consumer can select any one of the message systems according to their wish.
What is the difference between publisher and subscriber?
The provider of the information is called a publisher . Publishers supply information about a subject without needing to know anything about the applications that are interested in the information. The consumer of the information is called a subscriber .
What is subscribe and publishing messages?
Publish/subscribe messaging, or pub/sub messaging, is a form of asynchronous service-to-service communication used in serverless and microservices architectures. In a pub/sub model, any message published to a topic is immediately received by all of the subscribers to the topic.
What is publisher and subscriber in Java?
In the publish/subscribe domain, message producers are called publishers and message consumers are called subscribers. They exchange messages by means of a destination called a topic: publishers produce messages to a topic; subscribers subscribe to a topic and consume messages from a topic.
What are the advantages of the publish subscribe messaging?
Publish/Subscribe (Pub/Sub) messaging provides instant event notifications for these distributed applications. The Publish Subscribe model enables event-driven architectures and asynchronous parallel processing, while improving performance, reliability and scalability.
Is Kafka a pub-sub?
Is Pubsub better than Kafka?
In general, both are very solid Stream processing systems. The point which make the huge difference is that Pubsub is a cloud service attached to GCP whereas Apache Kafka can be used in both Cloud and On-prem.
What is the difference between pub/sub and Kafka?
Kafka brokers manage multiple ordered partitions of messages, represented by the horizontal rows of messages. You configure each Kafka topic with the number of partitions that you require to handle the expected consumer load. Pub/Sub scales automatically based on demand.
What is the difference between request-response and publish-subscribe?
The two we’ll look at are request-response and publish-subscribe. The typical model for computers communicating on a network is request-response. In the request-response model, a client computer or software requests data or services, and a server computer or software responds to the request by providing the data or service.
What is the difference between publish/subscribe semantics and request/reply semantics?
Publish/Subscribe semantics delivers messages to all subscribers of a topic. Request/Reply messaging sends requests via topics and routes responses back to the requestor. Subscribers can also join message queue groups when they subscribe to a topic.
What is an example of a request-response model?
In the request-response model, a client computer or software requests data or services, and a server computer or software responds to the request by providing the data or service. For example, when you send a spreadsheet to the printer, your spreadsheet program is the client.
How do I get a response from an API request?
The API provides a request () method: This method creates a temporary mailbox for the response, and write the reply-to address for us. Request () returns the response, or null if the request times out. The last argument is the number of milliseconds to wait.