qsl

qsl

• sl - Standard library - common frame for all ec q scripts

  • loading configurations and libraries
  • managing library paths and dependencies
  • automatically load logging, events and protected evaluation libraries
  • framing for q scripts

• pe - Protected evaluation library - wrapper for invoking functions in protected evaluation

  • handling both anonymous and named functions
  • signal handler can be defined by user
  • can be turned on and off during runtime
  • extended log messaging (e.g. function name, args etc.)

• event - Event library - execution of q functions as events

  • function is executed using protected evaluation
  • detailed information about event state is logged using .log.xxx interface - levels can be defined via event API; information is logged using dictionary format (key=value pairs)
  • information about event state is transferred to the monitor server using event files
  • detailed information about event is persisted in event files (the same information as event log message)
  • function execution time is measured

• callback - Callback library - managing callbacks

  • allows adding multiple callbacks under one interface name (e.g. .z.pg, .z.ps, .z.exit, etc.)
  • counts number of executions of each callback
  • allows flag 'execute as last one'

• timer - Timer library - abstraction layer for timer

  • allows execution of multiple different timers
  • runs a function every number of timer ticks provided per parameter
  • runs the specified function around specified time (10s accuracy)

• handle - Connection management library - abstraction layer for interprocess connections

  • initialization and maintaining connections between q processes
  • using logical components names (host/port/password read from config files)
  • two modes of connection initialization - lazy and eager
  • keeping state of each connection (registered, open, close, lost, `failed)
  • user defined callbacks on port-open and port-close
  • autoreconnection functionality

• authorization - Authorization library - access restrictions and auditing

  • providing authorization by validating incoming function calls against allowed namespaces and forbidden keywords (stop words);
  • authorization configuration is described in access.cfg schema file
  • logging access and function calls facilities (audit view)
  • logging of incoming synchronous and asynchronous function calls and user login/logout;
  • audit view configuration is described in access.cfg schema file (see <access.qsd>)

• u - u.q library - extension of u.q from Kx

  • provides API for subscription to data publishing in tickHF protocol
  • maintains subscription lists
  • end-of-day callback to all subribers

• sub - Subscription management library - abstraction for realtime data subscription

  • allows subscription to one of the for subscription to data published in tickHF, tickLF or protocols
  • subscribe and replay the data
  • keep subscription status

• store - Store library - data storage in the hdb

  • data storage as splayed and partition table
  • callback for reloading and filling missing tables in hdb
  • end of day support and integration with eodMng component

• os - Os library - shell commands abstraction, covers Linux, MacOS and Windows

  • directory operations - .os.mkdir, .os.cpdir, .os.rmdir
  • files operations - .os.rm, .os.move
  • find files by age and pattern - .os.find
  • compress file or directory - .os.compress
  • sleep for given number of milliseconds - .os.sleep

• parseq - Parseq library - Parseq is a Q clone of the Haskell's Parsec, a parser combinator library.

  • Most parser names are the same as in the original, except when colliding with q keywords.

• tabs - Tabs library - data model validation facilities

  • validation of the data model

• doc - Documentation loader library - access to the doc-string documentation from the source code

  • extract doc-strings from the q source files
  • documentation browsing - .doc.list
  • searching functionality - .doc.find
  • displaying detailed function description - .doc.show