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What is Channel? - Middleware News

Channel types
A channel is a communication link used by distributed queue managers. There are two categories of channel in MQ:
  • Message channels, which are unidirectional, and transfer messages from one queue manager to another.
  • MQI channels, which are bidirectional, and transfer MQI calls from a MQ client to a queue manager, and responses from a queue manager to a MQ client. There are two types of MQI channel : server-connection and client-connection.
The definition of each end of a message channel can be one of the following types:
  • Sender
  • Receiver
  • Server
  • Requester
  • Cluster sender
  • Cluster receiver
Do not confuse message channels with MQI channels. There are two types of MQI channel : server-connection and client-connection.
A message channel is defined using one of these types defined at one end, and a compatible type at the other end. Possible combinations are:
  • Sender - Receiver
  • Requester - Server
  • Requester - Sender (callback)
  • Server - Receiver (server is used as a sender)
  • Client-connection with Server-connection
  • Cluster sender-cluster receiver

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