Internal Design

Key classes

• Manager
  • Top level class created in main().
  • Loads the JSON configuration file.
  • Implements the D-Bus configure and monitor methods.
  • Contains a System object.
• System
  • Represents the computer system being controlled and monitored by the BMC.
  • Contains one or more Chassis objects.
• Chassis
  • Represents a physical enclosure that can be powered on and off by the BMC.
  • Small and mid-sized systems may contain a single Chassis.
  • In a large rack-mounted system, each drawer may correspond to a Chassis.
  • Contains one or more Device objects.
• Device
  • Represents a hardware device, such as a voltage regulator or I/O expander.
  • Contains zero or more Rail objects.
• Rail
  • Represents a voltage rail produced by a voltage regulator, such as 1.1V.
• Services
  • Abstract base class that provides access to a collection of system services like error logging, journal, vpd, and hardware presence.
  • The BMCServices child class provides the real implementation.
  • The MockServices child class provides a mock implementation that can be used in gtest test cases.