A beginner’s guide to “Java Messaging Service”
JMS or popularly known as the Java Messaging service was developed by the Sun Microsystems in order to devise a way to access the Enterprise messaging system or better known as the MOM or Message oriented middleware. The connection between the application s is always important. Most of the applications over the internet and mobile phones are created upon the Java platform. It is therefore necessary that the applications are able to communicate. The data delivery in the most discreet way is one of the prime urgencies behind the development of JMS. When there is need of sending messages between two clients we rely upon this middleware. This is an application interface for sending the messages between the users or the clients. Java enterprise Edition JEE contains the JMS and is well defined in the Java community process.
The messaging systems works as any simple socket program would work. The messages are the data that are communicated over the internet with the help of this JMS that acts a middleware. It thus acts as an integral part of a loosely coupled distributed system. In distributed systems the total execution of the application is never carried out upon a single system as the job is divided over the network by the various inherent systems present along with it.
With this Message oriented middleware the application software along with the other programs can transact or communicate. They can send and receive messages among themselves. The most important aspect of any messaging system is that the message is delivered in time and with a degree of certainty. The middle ware in this case the JMS or Java Messaging Service ensures that the software or programs can easily communicate between themselves without any hitch. This is an asynchronous electronic communication that consists of acknowledgment of transport of the messages in the system thus providing the clients with a foolproof system.
JMS acts an interface for the transport of the messages. There can be various models that any JMs can follow. The most popular ones being the Point to point model, Request and Reply model and lastly the Publish Subscribe model.
The JMs provides its clients with a very robust model that is portable over the internet. As we encounter in our daily life that an instrument that can translate out words into the language of another land is quite useful while communicating similarly the clients programs find the JMS a useful tool during such sort of communications.
The infrastructure that is built by the JMS is strong for the applications. The J2EE APIs are more adaptable to the real life situations. They have this immense capability to connect to heterogeneous instruments simultaneously and help them to maintain a lucid synchrony among themselves. JMS is to be properly understood by its users during the development of such MOM. It in itself is not a communicator; rather it acts as a specification with suitable semantics. The JMs providers thus have to support six sorts of messaging interfaces. These are Text, map, object, byte and stream message.
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