Hatohol server technical information

Software stack of components related to data transfer directly

Classes

FaceRest

A REST interface to get unified data and configure Hatohol itself.

ArmZabbixAPI, ArmNagiosNDOUtils

A component to get monitoring data from monitoring servers such as Zabbix server.

DBAgent

• A base class to access DBs
• Actual Subclassess: DBAgentMySQL and DBAgentSQLite3

DBClient

• The subclasses do the following things
  • Provides C++ like API to access data in DB.
  • manages one or more tables on DB.
  • Convert data format: list or vector <==> ItemTable.

ItemTable and ItemGroup

ItemData

• A virtual base class to handle various type of value with the same interfaces.
• Implemented subclasses:
  • ItemInt
  • ItemBool
  • ItemString
  • ItemDouble
  • ItemUint64
• A ItemData instance has the following information
  • ItemID (can be SYSTEM_ITEM_ID_ANONYMOUS)
  • Data type
  • Null flag
  • Value
  • Used count (derived from UsedCountable class)
• Cannot modify the value once it is added to ItemGroup because it has ItemData as const. After that ItemData can be used multiple contexts on different threads.
• An instance is typically wrapped by ItemDataPtr that is a smart pointer for ItemData and increments (decrements) the used count at the constructor (destructor).