EPA OPERATIONS NUCLEUS (EON)
COMPONENT SOFTWARE ENGINEERING

CONTENTS:
Background <> Tasks Performed <> Assumptions <> Data Structures <> Inputs <> Outputs <> Special Algorithms <> Pragmatics

Purpose

The EON performs all processing functions necessary to apply an EPA Preference Set to evaluate e-mail field contents, classify an e-mail as 'wanted' or 'unwanted' and explain/record the processing actions taken.

Background

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Tasks Performed

• Preference Set selection
• Preference Set access control
• E-mail field recognition
• E-mail field content test
• E-mail classification
• Mail Traffic Log maintenance

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Assumptions

The EON expects:

• The order of presentation of multiple e-mails' fields to be variable due to HMS message processing priorities.
• The order of presentation of a single e-mail's header's fields to be variable except that all header fields are expected to preceed the e-mail's body.
• The origin of e-mail field content presented to the EEI will be identified.
• To be able to modify the content of every field of every e-mail before that field content is delivered by the HMS to another process.
• That processing of a single e-mail may be abruptly ended(aborted) by the HMS with no further notification.

Data Structures

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Inputs

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Outputs

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Special Algorithms

• Preference Set Access
  • To avoid the ambiguity resulting from simultaneous access to a single Preference Set, the EON and the EWC employ an HMS-independent semaphore mechanism.

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Pragmatics

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