Message Oriented Middleware allows general purpose messages to be exchanged in a Client/Serversystem using message queues.

Message-oriented middleware (MOM) facilitates the exchange of general-purpose messages in a client/server system using message queues. It provides a way for applications to send messages to each other in a decoupled way, enhancing scalability, reliability, and asynchronous communication. Here are some key points about MOM:

### Core Concepts and Functions

1. Asynchronous Communication:

– Allows the sender and receiver of a message to operate independently, without needing both to be available at the same moment. The sender can continue its operation without waiting for a response.

2. Decoupling of Applications:

– Enables the separation of the client and server, meaning changes to the server-side can often be made without affecting the clients, as long as the message format and protocol remain the same.

3. Reliable Delivery:

– Guarantees that messages will be delivered even in the face of software or hardware failures, thanks to persistent storages and retries. Various Quality of Service levels can be defined, including “at most once”, “at least once”, and “exactly once” delivery semantics.

4. Scalability:

– Eases the scaling of applications by distributing messages across multiple servers or instances, often supporting load balancing and parallel processing.

5. Message Filtering and Routing:

– Provides the capability to route messages to the appropriate destination based on content or other message attributes. This can include publishing/subscribing mechanisms and topic-based filtering.

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