RabbitMQでは、connectionはブローカーへのTCP接続で、channelはconnection内の軽量な仮想接続です。channelを適切に使用する(多くのconnectionではなく)ことは、効率性のために重要であり、一般的なベストプラクティスです。
Connectionとchannel
CONNECTION → a TCP connection to the RabbitMQ broker:
→ relatively HEAVY (a real network connection, with overhead to establish/maintain)
CHANNEL → a lightweight, virtual connection MULTIPLEXED over a single TCP connection:
→ many channels share one connection → lightweight; most operations happen on channels
→ publishing, consuming, declaring queues → done via channels
→ one connection can have MANY channels (multiplexing reduces TCP overhead)
