jms,node js

• JMS (Java Message Service)


  An API that provides the facility to create, send and read messages. It provides loosely coupled, reliable and asynchronous communication.
• JMS


  • Asynchronous: To receive the message, client is not required to send request. Message will arrive automatically to the client.
  • Reliable: It provides assurance that message is delivered.
• Messaging is a technique to communicate applications or software components
• JMS is mainly used to send and receive message from one application to another
• Messaging Domains

  • Point-to-Point Messaging Domain
  • Publisher/Subscriber Messaging Domain

  
• Point-to-Point (PTP) Messaging Domain


  One message is delivered to one receiver only. Queue is used as a message oriented middleware (MOM) to hold the message until receiver is ready. There is no timing dependency between sender and receiver.
• Publisher/Subscriber (Pub/Sub) Messaging Domain

  One message is delivered to all the subscribers. Topic is used as a message oriented middleware to hold and deliver messages. There is timing dependency between publisher and subscriber.

  
• ConnectionFactory


  An Administered object, used for creating Connections. Implements QueueConnectionFactory and TopicConnectionFactory.

  
• Connection


  A client's active connection to its JMS provider. Allocates provider resources outside the Java virtual machine (JVM).
• Session


  A single-threaded context for producing and consuming messages. With the auto acknowledgment mode, the session automatically acknowledges a client's receipt of a message.
• MessageConsumer


  A client uses this object to receive messages from a destination. Created by passing a Destination object to a message-consumer creation method supplied by a session.
• JMS Point-to-Point Connection


  1. Establish connection to ActiveMQ broker

  2. Create session

  3. Create queue

  4. Create message producer

  5. Send message

  
• JMS Publish-Subscribe Connection


  1. Establish connection to ActiveMQ broker

  2. Create session

  3. Create topic

  4. Create message producer

  5. Send message

  
• ActiveMQ is an open source message broker software that implements the Java Message Service (JMS) API

  
• To use ActiveMQ, enter username and password as 'admin'