The Mailbox Library: 6 Application Responsibilities

The application is insulated from most of the mundane responsibilities of transmitting and receiving data. Its behavior is event-driven. It has to know how to respond to a variety of requests from the Mailbox library; however, it generally does not have to initiate action on its own.

There are a number of specific tasks an application must perform:

It must provide the right UI (usually in the form of controllers) for using the Inbox/Outbox functionality. It can do this by including the appropriate controllers.
It must package data into an acceptable format. When the user selects data to transmit (which could be a small message or an entire document), it must format the data appropriately.
It must be able to handle incoming messages. This consists of notifying the user that new data has been received, incorporating the data into the document (or adding a new document containing the data), delete the message it's been sent, and notify the Mailbox library that it has received the data.

Providing a User-Interface

Sending a Message

Receiving and Processing Messages

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