azure - Service Bus Brokered VS Relayed Messaging -

i have question confusing me differences between types of service bus, brokered messaging , relayed messaging? not looking development perspective want understand more concept , differences between them.

thank you.

service bus relay , service bus brokered messaging both mechanisms developing distributed , hybrid applications. however, target different development , access patterns.

• service bus (sb) relay provides simple & secure way service remoting, i.e., enables securely expose service hosted on private cloud external clients. case service remoting scenarios, clients explicitly invoke methods exposed "relayed" service. primary advantage of sb relay service can exposed without requiring changes firewall settings or intrusive changes corporate network infrastructure.

• sb brokered messaging on other hand provides durable messaging platform components such queues, topics , subscriptions. these can used implement complex patterns such publish-subscribe , temporal decoupling between different parts of application. since brokered messaging infrastructure can reliably store messages, senders , receivers not have online @ same time, or not have process messages @ same pace.

relayed messaging appropriate scenarios have service want expose external clients. clients interact "relayed" service in same manner if on local network, except access via sb relay endpoint. since service remoting scenario, response immediate subject network latency. however, if whatever reason service unavailable @ moment, client's request fail.

in case of brokered messaging, since send & receive operations decoupled, sender can continue send messages reliably stored on service regardless of whether receiver online or not. however, tradeoff resiliency request processed subject receiver's ability retrieve , process message.