MessageBus vs MessageBus
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This document compares and contrasts message buses and service buses. A message bus allows modules to communicate by sending requests without knowing the destination, and supports replacing or adding providers without impacting other modules. However, modules using a message bus require a common data format. A service bus also allows loosely coupled communication between modules. Additionally, it supports modules communicating even if they use different data formats, through the use of data transformers. This means modules can be switched or changed without requiring other modules to change. However, a service bus is more complex than a message bus and may be overkill for small applications.
MessageBus vs MessageBus
- 1. Why MessageBus and ServiceBus != MessageBus kiennt10@techcombank.com.vn 18th Nov 2016
- 2. Why • If you have a big application, then dividing into several modules will be a good idea • But then problem arises, how to connect those separate modules? • Java RMI, CORBA to SOAP, RESTful • they are point-to-point. 2 modules need to know the destination
- 3. Decoupled? • Able to send service request without knowing the service providers • Replace • Switch those providers on/off without affecting the callee • Multiple modules to handle a single request simultaneously, such as one for processing data, one for logging, and one for notification. MESSAGE BUS come to stage!
- 4. Message bus • Usually based on queue platform: ActiveMQ, RabbitMQ, ZeroMQ, Kafka… • Module come and say • A: I want to get email of this user • B: I know how to get email of user, if some one ask, I can answer him • Mapping request with providers • Other modules • I don’t know how to get user email, but please inform me if some one trying to do it
- 5. Oh! Now it have problems • Now we use FSS APIs, later we want to switch to TCB APIs with difference format. Will I need to change my module? • I’m using RabbitMQ for my message bus, I want to move to Kafka, will I need to change my module? • A BIG YES!
- 6. Difference between Message Bus <> Service Bus • Service-Bus allows different modules to connect with each other without the need for a common data format. Using data transformer • module can send a RESTful message to a SOAP- based module • Send RESTful to Queue • Module itself don’t need to care. It’s more like it standalone
- 7. Conclusion • Message bus • Infrastructure for routing messages between publishers/subscribers • Need a common data model to inter- operate between modules • Quite simple and easy to use • Service Bus • Infrastructure for routing service requests and responses • Can be used between modules with different data format • A bit overkill to be used in small applications
- 8. THANK YOU