Topology Patterns

ServiceBus.Core descriptors allow complex RabbitMQ topologies to be represented declaratively.

Understanding common topology patterns helps design scalable messaging infrastructures.

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Point-To-Point

The simplest topology.

graph LR

    Exchange --> Queue

Characteristics:

• single destination;
• deterministic delivery;
• simple maintenance.

Typical usage:

• command processing;
• background jobs.

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Publish / Subscribe

Multiple consumers receive the same message.

graph LR

    Exchange --> QueueA

    Exchange --> QueueB

    Exchange --> QueueC

Characteristics:

• broadcast communication;
• independent consumers;
• loose coupling.

Typical usage:

• integration events;
• notifications;
• audit processing.

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Exchange Chain

Messages flow through multiple exchanges.

graph LR

    Orders --> Integration

    Integration --> Audit

    Audit --> Queue

Benefits:

• topology composition;
• separation of concerns;
• reusable routing layers.

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Replication Pattern

A message is distributed to multiple systems.

graph LR

    Orders --> ERP

    Orders --> CRM

    Orders --> Analytics

Typical usage:

• enterprise integration;
• reporting;
• monitoring.

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Environment Isolation

Dedicated topologies per environment.

graph LR

    OrdersExchange --> Dev

    OrdersExchange --> QA

    OrdersExchange --> Production

Benefits:

• safer deployments;
• environment separation;
• easier testing.

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Descriptor Mapping

The following descriptors are typically involved:

Descriptor	Responsibility
ExchangeDescriptor	Exchange definition
QueueDescriptor	Queue definition
ExchangeBoundDescriptor	Topology composition
BinderDescriptor	Binding definition

Topology design is one of the primary reasons the descriptor model exists.