4.3. AMQP Exchange Types
There are five AMQP Exchange types. The different exchanges provide different means of routing messages so that consumers can subscribe to the particular flow of information that is of interest to them.
The AMQP Exchange types are:
- Direct
- A Direct Exchange allows a consumer to bind a queue to it with a key. When a message is received by a direct-type exchange, the message is routed to any queues whose binding key matches the subject of the message. The Direct Exchange also supports exclusive bindings, which allow a queue to monopolize messages sent to an exchange, and implement a simple direct-to-queue model.
- Topic
- A Topic Exchange allows a consumer to bind a queue to it with a key that specifies wildcard matching. The wildcard is then matched against the subject of messages sent to the exchange. This allows you to implement message filtering patterns using a topic exchange and various queues with different binding keys.
