Class: ProcessQueryLanguage::Backend::ProcessStatus

Inherits:
Object
  • Object
show all
Defined in:
lib/process-query-language/backend/process-status.rb

Overview

This backend uses the ps utility and parses its output. Because ps uses whitespace as the delimiter (and truncates too wide fields) except the last, we need to sort the fields so that :command is the last.

Constant Summary collapse

FIELDS = 
%w{ pid rss command }.map(&:to_sym)

Instance Method Summary collapse

Instance Method Details

#scan(fields) ⇒ Object 



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# File 'lib/process-query-language/backend/process-status.rb', line 14

def scan(fields)
  result = []
  %x[ps -Aco #{FIELDS.join(',')}].lines.to_a[1..-1].each do |line|
    values = line.split(' ')
    process = {}
    FIELDS.each_with_index do |value, i|
      next unless fields.include?(FIELDS[i])
      process[FIELDS[i]] = convert(FIELDS[i], values[i])
    end
    result << process
  end

  return result
end