What is the difference between queue and topic in ActiveMQ?
While queues and topics are the most famous ones, virtual topics can combine the best of both worlds: multiple consumers with their own dedicated queue. Queues. Queues are the most obvious messaging pattern implemented by ActiveMQ. They provide a direct channel between a producer and a consumer.
What are the topic host queue managers responsible for?
The topic host queue managers are responsible for routing publications from queue managers on which publications are published to queue managers with matching subscriptions. The following table lists the attributes on the Statistics page of the IBM WebSphere MQ Topic Properties dialog.
What is queue and topic in Java?
Queues and topics are objects that are owned and stored by a queue manager . When your application wants to transfer data to another application, it puts the data into a message. It puts the message onto a queue, or publishes the message to a topic.
What are queue and topic in Salesforce?
An application or administrator creates a queue or a topic. Queues and topics are objects that are owned and stored by a queue manager . When your application wants to transfer data to another application, it puts the data into a message. It puts the message onto a queue, or publishes the message to a topic.
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.
How do I create a topic in IBM MQ?
ProcedureExpand the queue manager that hosts the Publish/Subscribe Engine to display the object-folders in the Navigator view.Right-click Topics, then click New > Topic.
What is a topic string?
A topic string is a character string that identifies the topic of a publish/subscribe message. You can use any characters you like when you construct a topic string.
What are the MQ components?
There are seven components in WebSphere MQ that must be proactively monitored to ensure that message delivery occurs within an acceptable timeframe.Queue Managers. ... Cluster Queue Managers. ... Queues. ... Channels and Listeners. ... Services. ... Events. ... Automatic Monitoring.
What is topic and 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 subscription in MQ?
In IBM® MQ publish/subscribe, a subscriber is an application that requests information about a specific topic from a queue manager in a publish/subscribe network. A subscriber can receive messages, about the same or different topics, from more than one publisher.
What is topic in GCP?
Topic. A named resource to which messages are sent by publishers. Subscription. A named resource representing the stream of messages from a single, specific topic, to be delivered to the subscribing application.
How do I check messages in MQ topic?
Use runmqsc or the MQ Explorer and show the Destination Name of the temporary queue. For example, a subscriber was created using the above "define sub" command and the output of the display is shown below. AMQ8096: WebSphere MQ subscription inquired. Notice the value of the field "DEST" (which is the Destination Name).
How does Pubsub work in MQ?
IBM MQ publish/subscribe removes the need for your application to know anything about the target application. All the sending application has to do is this: Put an IBM MQ message that contains the information that the application wants. Assign the message to a topic that denotes the subject of the information.
What is local queue in MQ?
Local queue. A local queue is a definition of both a queue and the set of messages that are associated with the queue. The queue manager that hosts the queue receives messages in its local queues. Transmission queue. Transmission queues are a special type of local queue.
What are FDC files in MQ?
Problem. As it runs, IBM MQ logs error messages, creates FFSTs (also known as FDC files), and generates other diagnostic output files such as IBM i job logs, Windows minidumps and z/OS dumps. IBM MQ can also generate data such as FFSTs, z/OS dumps, and IBM MQ line trace CDF files when requested by the administrator.
What is queue manager in MQ?
A queue manager manages the resources associated with it, in particular the queues that it owns. It provides queuing services to applications for Message Queuing Interface (MQI) calls and commands to create, modify, display, and delete IBM® WebSphere® MQ objects.
Cluster
The following table lists the attributes on the Cluster page of the IBM WebSphere MQ Topic Properties dialog.
Statistics
The following table lists the attributes on the Statistics page of the IBM WebSphere MQ Topic Properties dialog.
Topics
A topic string is a character string that identifies the topic of a publish/subscribe message. You can use any characters you like when you construct a topic string.
Examples of topic strings
Wildcard schemes There are two wildcard schemes used to subscribe to multiple topics. The choice of scheme is a subscription option.
What is IBM MQ?
IBM MQ can transport any type of data as messages, enabling businesses to build flexible, reusable architectures such as service-oriented architecture (SOA) environments . It works with a broad range of computing platforms, applications, web services and communications protocols for security-rich message delivery.
Why are messages placed in queues?
Messages are placed on queues, so that programs can run independently of each other, at different speeds and times, in different locations, and without having a direct connection between them. Point-to-point. Applications send messages to a queue, or to a list of queues.
Can you run an interpreter on a queue manager?
You can also run the interpreter on one queue manager, which sends the commands to a different computer to administer a different queue manager. The Programmable Command Format (PCF) commands, which you call in your own applications to administer IBM MQ.
Is IBM MQ server or client?
Whether it is IBM MQ client or server makes almost no difference to the application. You can build a client/server application with IBM MQ clients or servers.
Can you have multiple queues on one computer?
You can have many queues and topics on one queue manager. You can have more than one queue manager on one computer. An application can run on the same computer as the queue manager, or on a different one. If it runs on the same computer, it is an IBM MQ server application.
What is ActiveMQ?
ActiveMQ provides a variety of different messaging patterns. While queues and topics are the most famous ones, virtual topics can combine the best of both worlds: multiple consumers with their own dedicated queue.
What is virtual topic?
Virtual topics are provide a solution for both problems. Producer and consumers are decoupled by a publish-and-subscribe pattern while error recovery can be done on individual queues.
