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Glossary of Terms
Marco Roda edited this page Mar 16, 2020
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16 revisions
This page defines the current language being used to describe elements of the DAQ Application Framework. discuss
- DAQ System: A set of DAQ Applications working in concert to perform the functions needed to effect data acquisition.
- DAQ Application: A single unit of the DAQ System in the form of an executable program that is started and controlled through the CCM. DAQ Applications perform a defined set of tasks based on their configuration.
- Plugin: A piece of code provided either by the toolkit or by users (generally-useful plugins should be incorporated into the toolkit if possible), characterized by a specific interface, to perform a single task. Multiple plugins with different implementations can exist for a single interface. Users of plugins should be shielded from any implementation details. The plugin compiled code should be a shared library containing Components
- Component an implementation of one or more Interfaces
- Factory a component that provides instantiated Components via its Interface C++ type a component type name and an instance name
- Component Type Name string data (not code) identifying a Component, may be the C++ type name or another
- Component Instance Name string data identifying one instantiation of a component
- Queue: A class which stores data between User Modules within a DAQ Application and provides methods for storage and retrieval. May provide a queue-like interface or random access.
- Interface: A pure abstract base class.
- Data Flow Programming: (DFP) a paradigm to describe a larger system as a graph in terms of data transformation nodes and data transportation edges
- DFP Node: a unit of code with an identifier (name) unique in the system with zero or more DFP Ports
- DFP Port: an identified point on a DFP Node which may produce or accept DFP data message (or both). It typically as a Socket
- DFP Edge: a data transport conduit between two DFP Ports
-
Socket: the endpoints of a DFP Edge, each associated with a DFP Port. An application may
send()
a message to a Socket and it mayrecv()
a message from a Socket (eg: BSD sockets, ZeroMQ sockets) -
Transport: act of transmitting a message between a Socket
send()
to another Socketrecv()
, transports include transmission over TCP/IP, Unix domain sockets ("FIFO"s) and inter-thread via shared memory.
- User Module: A distinct set of code which performs a specific task. Implemented by users, will be loaded into a DAQ Application according to the application configuration. Can load plugins. Connected to other User Modules within a DAQ Application via queues.