What is a topic in JMS?

Asked by: Denise Austin

A JMS topic is the type of destination in a 1-to-many model of distribution. The same published message is received by all consuming subscribers. You can also call this the ‘broadcast’ model. You can think of a topic as the equivalent of a Subject in an Observer design pattern for distributed computing.

What is a topic vs queue?

The main difference between queue and topic is that queue is the message-oriented middleware used in point to point message domain, while the topic is the message-oriented middleware used in publisher- subscriber message domain.

What is a topic in messaging?

A topic is the subject of the information that is published in a publish/subscribe message. Messages in point-to-point systems are sent to a specific destination address. Messages in subject-based publish/subscribe systems are sent to subscribers based on the subject that describes the contents of the message.

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.

What is topic in ActiveMQ?

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 Azure?

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.

Is a topic a message 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.

How does queue and Topic work?

In queue, you only have one receiver or consumer; unlike in topic where in you can have your message be disseminated to a number of subscribers. Also, in topic, the publisher has to be continuously active for a subscriber to receive the messages. Otherwise the message will be reallocated.

How do MQ topics work?

In content-based systems, messages are sent to subscribers based on the contents of the message itself. The IBM® MQ publish/subscribe system is a subject-based publish/subscribe system. A publisher creates a message, and publishes it with a topic string that best fits the subject of the publication.

What is topic and queue in Solace?

There are two types of endpoints: queues and topic endpoints. In most scenarios the queue endpoint is a superset of the topic endpoint, and is the endpoint most commonly used. Topic endpoints are used by JMS (that is, durable topic subscriptions).

What is queue and Topic in EMS?

If messages published on EMS Server are broadcast nature for which you want multiple subscribers to listen, topics should be preferred. If you want to ensure that messages are delivered one by one to every subscriber with reliability, consider point to point communication model by using queues.

How do I send a message to JMS topic?

Sending messages to a JMS topic or queue

1. Create and configure a JMS data source. …
2. Create a message properties context. …
3. Create a message body string or context. …
4. Call the SendJMSMessage function and pass the values the JMS data source, the message properties context, and the specified message body as runtime parameters.

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.

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.