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I have heard talk about the NServiceBus, but I haven't really understood what it is. They claim to be "The most popular open-source service bus for .net".
What is a service bus, and when do I need one?
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Azure Service Bus is a messaging service on cloud used to connect any applications, devices, and services running in the cloud to any other applications or services. As a result, it acts as a messaging backbone for applications available in the cloud or across any devices.
An enterprise service bus (ESB) is a software platform used to distribute work among connected components of an application. It is designed to provide a uniform means of moving work, offering applications the ability to connect to the ESB and subscribe to messages based on simple structural and business policy rules.
Queues offer First In, First Out (FIFO) message delivery to one or more competing consumers. That is, receivers typically receive and process messages in the order in which they were added to the queue. And, only one message consumer receives and processes each message.
Blog:Service Bus for Windows Server: A Primer An Enterprise Service Bus (ESB) is a shared messaging layer that gives you a consistent, scalable and flexible means of coordinating across disparate, loosely-connected services to execute business processes.
You can think of a service bus as the Ethernet of SOA.
First and foremost, it introduces a language of identifying things, like an IP address in Ethernet. This name isn't something inherently physical.
Next, you have something physical involved on each node, like a queue in the case of a bus for supporting semi-connected communication, or an Ethernet card in the metaphor.
Beyond just the physical, there is the "protocol" part of the communication, like the OSI stack for Ethernet. With the bus, this is the client libraries used by application code.
Ultimately, you can view a service bus as providing the next higher level of abstraction for building distributed systems. You can use it also for client-server communication to give you durable one-way messaging as well as for the server to push notifications back to the client.
Specifically, you'll find NServiceBus to be quite lightweight and easy to use once you make peace with its use of queuing technology - your choice of RabbitMQ, MSMQ, Regular SQL Tables, Amazon SQS, Azure Storage Queues, and Azure Service Bus.
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