Message Queue vs Message Bus -- what are the differences?
And are there any? To me, MB knows both subscribers and publishers and acts as a mediator, notifying subscribers on new messages (effectively a "push" model). MQ, on the other hand, is more of a "pull" model, where consumers pull messages off a queue.
Am I completely off track here?
Answer
Message Bus
A Message Bus is a messaging infrastructure to allow different systems to communicate through a shared set of interfaces(message bus).
Source: EIP
Message Queue
The basic idea of a message queue is a simple one:
Two (or more) processes can exchange information via access to a common system message queue.
The sending process places via some (OS) message-passing module a message onto a queue which can be read by another process
Source: Dave Marshall
Difference
Message Queue contains FIFO(first in first out) rule whereas in Message Bus does not.
Conclusion
Both LOOK like doing same kind of work - passing messages between two Applications or Modules or Interfaces or Systems or Processes, except small difference of FIFO