What is function of Message queue?

Message queues provide a form of message passing in which any process can read a message from or write a message to any IPC message queue on the system. There are no requirements that a process be waiting to receive a message from a queue before another process sends one, or that a message exist on the queue before a process requests to receive one.

What is Message queue?

A message queue is a queue of messages sent between applications. It includes a sequence of work objects that are waiting to be processed.

Another application, called a consumer, connects to the queue and gets the messages to be processed. Messages placed onto the queue are stored until the consumer retrieves them.

Why do we need Message queue?

• Queue is used when things don’t have to be processed immediately.
• It have to be processed in First In First Out order like Breadth First Search. 

What is message queue example?

 Is Kafka a message queue?

We can use Kafka as a Message Queue or a Messaging System but as a distributed streaming platform Kafka has several other usages for stream processing or storing data.

We can use Apache Kafka as:

• Messaging System.
• Storage System.
• Streaming Platform.

How do I create a messaging queue?

Creates a new queue at the specified path on a Message Queuing server.

Overloads

• Create(String):- Creates a non-transactional Message Queuing queue at the specified path.
• Create(String, Boolean):- Creates a transactional or non-transactional Message Queuing queue at the specified path.

Create(String)

Creates a non-transactional Message Queuing queue at the specified path.

:- public static System.Messaging.MessageQueue Create (string path);

Parameters

path String

The path of the queue to create.

Returns

MessageQueue

A MessageQueue that representes the new queue.

Exceptions

ArgumentException

The path parameter is null or is an empty string (“”).

MessageQueueException

A queue already exists at the specified path.

-or-

An error occurred when accessing a Message Queuing method.

Examples

The following code example creates public and private queues. It sends a message to selected queues.

using System;
using System.Messaging;

namespace MyProject
{
/// /// Provides a container class for the example. ///
public class MyNewQueue
{

}

How do I read message queue?

Read messages from queues using the get next statement with the message queue record as the I/O object.When you use the get next statement, EGL performs the following actions:

• Connects to the queue manager, if the queue manager is not already connected.
• Opens the queue, if the queue is not already open.
• Gets the next message from the queue.

You must use a local definition of the remote queue on the currently connected queue manager if both of the following circumstances are true:

• You are reading messages from a queue on another Queue Manager using the get next statement.
• You previously read a message from a queue using the get next statement.

You must use the close statement after a get next statement to close the connection to the queue in any of the following circumstances:

• Before using the add statement.
• To release the queue for access by another program.
• To release the queue if you have a long running program and have completed work with the queue.

EGL automatically closes the connection to the queue on program termination.

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