Different classification of Message Channels.

Broadly there are 2 classifications.

• Pollable channel,
  • point-to-point channel (only one receiver of a message in the channel),
  • requires a quieue to hold the message and queue will have designated capacity,
  • buffer its messsage.

• and Subscribable channel.
• does not buffer messages,
• allows multiple subscribers (consumers) to regisiter for its messages,
• Usually used for "event" based messaging.

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