What is the message system paradigm
The message system paradigm (Object Oriented Middleware) (Message Oriented Middleware, MOM) is an extension of the basic messaging paradigm. In this paradigm, the messaging system acts as an intermediary between relatively independent processes. Different processes exchange information asynchronously through the message system in a non-coupling manner. When a message sender (process) sends a message, it puts a message into the message system, which then forwards the message to the message receiving queue corresponding to each receiver (process). Once the message is sent, the sender is Can perform other tasks.
Briefly describe the realization principle of e-mail system
The e-mail system consists of user agent, transmission agent, and delivery agent. First, the user sends the e-mail to the e-mail server through the user agent. The e-mail server is the transmission agent, and the received e-mail is placed in the e-mail queue. The destination address of the mail is forwarded by the delivery agent.
