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What is ActiveMQ topic?

3 min read

Asked by: David Kleiner

What Is an ActiveMQ Topic? ActiveMQ topic is a pipeline of messages where a message comes in and goes to every subscriber.

What is a topic in queue?

Queues and Topics are similar when a sender sends messages, but messages are processed differently by a receiver. A queue can have only one consumer, whereas a topic can have multiple subscribers.

What is topic and queue in JMS?

A JMS destination is an object (a JMS queue or a JMS topic) that represents the target of messages that the client produces and the source of messages that the client consumes. In point-to-point messaging, destinations represent queues; in publish/subscribe messaging, destinations represent topics.

What is a message topic?

A sibling to a message queue, a message topic provides a lightweight mechanism to broadcast asynchronous event notifications, and endpoints that allow software components to connect to the topic in order to send and receive those messages.

What is topic and queue in Solace?

With queues, selectors are processed at egress, and with topic endpoints, they are processed on ingress. This means that queues persist every message even if they don’t match the selector, while with topic endpoints messages are only persisted if they match both the topic subscription and the selector.

What is topic and subscription?

A topic subscription resembles a virtual queue that receives copies of the messages that are sent to the topic. Consumers receive messages from a subscription identically to the way they receive messages from a queue.

What is a virtual topic?

Virtual topics are a combination of topics and queues. Producers will write messages to a topic while listeners will consume from their own queue. ActiveMQ will copy and duplicate each message from the topic to the actual consumer queues.

What is topic in Azure?

Azure Service Bus Topic is a messaging service offered by Microsoft Azure. Topics along with subscriptions provide a one-to-many form of communication, in a publish/subscribe pattern. Messages are sent to a topic and delivered to one or more subscriptions, based on filter rules that are set on a per subscription basis.

How do I create a topic in ActiveMQ?

A Short ActiveMQ and JMS Tutorial

  1. Step 1: Download and start ActiveMQ. …
  2. Step 2: Download the JMS Example file. …
  3. Step 4: Open three additional console windows. …
  4. Step 3: Do the Maven Install. …
  5. Step 4: Start the JMS Consumers and Producer for Topic-based Messaging. …
  6. Step 5: Send JMS messages to the Topic.

What is topic in Java?

It is the way a client specifies the identity of a topic to JMS API methods. For those methods that use a Destination as a parameter, a Topic object may used as an argument . For example, a Topic can be used to create a MessageConsumer and a MessageProducer by calling: Session.

How do I create a JMS topic?

Setting Up a JMS Application

  1. Step 1: Look Up a Connection Factory in JNDI. …
  2. Step 2: Create a Connection Using the Connection Factory. …
  3. Step 3: Create a Session Using the Connection. …
  4. Step 4: Look Up a Destination (Queue or Topic) …
  5. Step 5: Create Message Producers and Message Consumers.

How many topics are there in Java language?

Core Java Topics & Basic Concepts Complete list

1 Overview Of Programming With Java
12 Interfaces, Packages and Access Control
12.1 Java Interface
12.2 Difference Between Interfaces And Abstract Classes
12.3 Future Task Java Program Using Interfaces