Method: PCPEasy::PMAPI.pmExtractValue

Defined in:

lib/pcp_easy/pmapi.rb

.pmExtractValue(value_format, pm_desc, pm_value) ⇒ Object

# File 'lib/pcp_easy/pmapi.rb', line 205

def self.pmExtractValue(value_format, pm_desc, pm_value)

  atom = PCPEasy::PMAPI::PmAtomValue.new
  error_code = FFIInternal.pmExtractValue(value_format, pm_value.pointer, pm_desc.type, atom.pointer, pm_desc.type)
  raise PCPEasy::Error.from_pmapi_error_number(error_code) if error_code < 0

  case pm_desc.type
    when PM_TYPE_32
      atom.l
    when PM_TYPE_U32
      atom.ul
    when PM_TYPE_64
      atom.ll
    when PM_TYPE_U64
      atom.ull
    when PM_TYPE_FLOAT
      atom.f
    when PM_TYPE_DOUBLE
      atom.d
    when PM_TYPE_STRING
      str = atom.cp.read_string
      LibC.free(atom.cp) if atom.cp
      str
    when PM_TYPE_AGGREGATE || PM_TYPE_EVENT || PM_TYPE_HIGHRES_EVENT
      # No support, make sure we free the pointer
      LibC.free(atom.vbp) if atom.vbp
      raise PCPEasy::Error.new "Metric type #{pm_desc.type} not supported"
    else
      raise ArgumentError.new "Type #{pm_desc.type} not valid"
  end
end