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Transport types

Component:
NServiceBus

NServiceBus transports can be divided into several categories:

  • Federated transports
  • Broker transports
  • Unicast-only transports
  • Multicast-enabled transports

A description of each appears in the corresponding category below.

Federated transports

Federated transports are inherently distributed. Each endpoint instance may connect to a different node of the queuing technology. Messages are routed transparently between the nodes, but the physical routing layer must contain information about which node a particular endpoint is connected to.

Federated transports include:

Broker transports

Broker transports are inherently centralized. Even if there are multiple servers, there is a single logical instance that hosts all the queues (and/or topics/exchanges).

Broker transports include:

Unicast-only transports

Unicast-only transports do not have the notion of topics, exchanges, or similar concepts; only queues. Because of this, they allow only point-to-point communication. Sending a message to multiple receivers (e.g., publishing an event) involves multiple transport-level sends. Unicast-only transports require subscription storage via NServiceBus persistence.

Unicast-only transports include:

Multicast-enabled transports

Multicast-enabled transports have some notion of topics, exchanges, or similar concepts, which allow sending a message once and having it received by multiple clients. These transports do not require subscription storage.

Multicast-enabled transports include:

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