JMS is a Java Message Service API for enterprise messaging products. It establishes communication between two different systems in a reliable and efficient way. In simpler words, JMS is like a “Postal Service” for Java components that allows to share messages from one component to another component in a queue system. In this article, we will explore What is JMS? And What is It Used for? Let’s dive right into it!
Understanding JMS in Detail
JMS is an API that allows Java components to send, create, read, and receive messages with other software components. It supports asynchronous messaging and loose coupling; thus, this feature ensures reliable message delivery. Even though the receiver is not present, a message will be in the queue until and unless the receiver picks it up. Using this, Java programmers do not need to learn about each messaging system in detail. It allows a seamless switch between systems without delving into the underlying complexities. Most importantly, JMS offers convenience for big organizations to share information with different applications in an organized and reliable way. Moreover, JMS architecture consists of the following:
- JMS Clients: This is nothing but Java-based software programs that produce and consume messages.
- Messages: It is the objects through which JMS clients i.e., sender and receiver share the information and interact with a messaging system.
- JMS Provider: It provides the interface for distributed Java applications to share the messages
Let’s understand the above concept of JMS with a real-life use case of an automobile manufacturing company.
- Whenever production of cars drops below a certain specified level, a manufacturer component sends the message to the factory component directly. This way, it allows them to build more cars in advance.
- At the same time, the factory component can also interact with the manufacturer to assemble the required parts. Also, the factory component can send a message to another component i.e., “part component” that is responsible for the parts, so that it can deliver the parts that the manufacturer needs.
- Simultaneously, the part component can also send a message to update its inventory and place new orders from suppliers.
- Finally, factory and parts units can communicate with the accounting component to manage the budget effectively.
Through this approach, the sales team can easily keep track of recent and accurate information about the product. Because of this reason, JMP is highly advantageous when various components need to communicate in a distributed system without causing congestion in the network.
JMS Messaging Domain is Classified into Two Categories
Most of the previous JMSs support only one approach to messaging. Whereas the current JMS extends the flexibility of the application by supporting both messaging domains. The following are the two categories:
1. Point-to-Point (PTP) Messaging Domain: PTP follows the concept of message queues. Where senders send the message and that gets directed into the queue. A receiver on the other side retrieves the message from the assigned queues. It stores each message and ensures the designated receiver picks them up. If the respective receiver doesn’t receive the message, it will expire. The following are some of the characteristics of PTP:
- There’s only one receiver for each message
- No need for both parties to be online while sending the message
- The receiver can acknowledge the successful processing of a message at any time.
- No timing dependencies
2. Publishers/Subscriber (Pub/Sub) Domain: It is also known as a topic message. In pub/sub, both products and applications operate on different principles. It lets the identities of the publisher and subscriber be anonymous. Also, it provides flexibility to join the content hierarchy. The system ensures that the message is promptly shared with a specific subscriber who gets the information. Here, neither the publisher nor the subscriber knows who receives it or sends it. The following are the characteristics:
- For one message there may be multiple receivers
- Both the publishers and subscribers have timing dependencies
- Whenever anyone subscribes to the topic, they will keep getting the message but need to stay active
- Durable subscription features help to overcome the timing dependency and let them receive the message while they’re not active
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What is JMS Used for?
JMS is used when enterprises want their software to run smoothly and operate independently. JMS is used for the following reasons:
- Component Flexibility: Whenever an enterprise wants to create a modular and flexible system that does not rely on each component. Thus, without causing any disruption in the application, it can change and upgrade the components.
- Business-to-Business E-commerce: JMS guarantees secure delivery of every message between organizations on an agreed standard message format. The electronic commerce XML standards simplify the integration process and make the business transaction smooth.
- Loose Couple Operations: JMS allows the components to work simultaneously due to loosely coupled operation. Enterprise needs their application to run and function properly even though some parts of the application are unavailable temporarily.
- Smooth Data-Interchange in Corporate: Demand for data exchange between corporate applications is high. JMS acts as a middleman and allows asynchronous communication for effective applications within the organization.
- Asynchronous Communication: JMS supports asynchronous communication that lets the business model of the application send the message without waiting for the receiver to respond to it.
JMS provides efficiency and flexibility for enterprises to establish seamless communication. Businesses can use this valuable tool to enhance the communication infrastructure. It will not only provide a robust communication model but also promote agility.
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In JMS, MOM ensures reliable asynchronous communication between components in a distributed system.
JMS ensures the reliable delivery of messages with continuous operation without any interruption. Whenever the consumer is not available, it stores the incoming message into persistence store.
Topics are used when multiple producers want to send their messages to various subscribers. When more than one producer sends a message to a single consumer, then queues are used.
JMS works well with Java components, but it does not integrate well with the other frameworks and microservice architecture.