Class: ServerMetrics::Processes::Process

Inherits:
Object
  • Object
show all
Defined in:
lib/server_metrics/collectors/processes.rb

Overview

a thin wrapper around Sys:ProcTable’s ProcTableStruct. We’re using it to add some fields and behavior. Beyond what we’re adding, it just passes through to its instance of ProcTableStruct

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(proctable_struct) ⇒ Process

Returns a new instance of Process.



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# File 'lib/server_metrics/collectors/processes.rb', line 151

def initialize(proctable_struct)
  @pts=proctable_struct
  @recent_cpu = 0
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object

delegate everything else to ProcTable::Struct



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# File 'lib/server_metrics/collectors/processes.rb', line 166

def method_missing(sym, *args, &block)
  @pts.send sym, *args, &block
end

Instance Attribute Details

#recent_cpu ⇒ Object

used to store the calculation of CPU since last sample



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# File 'lib/server_metrics/collectors/processes.rb', line 150

def recent_cpu
  @recent_cpu
end

#recent_cpu_percentage ⇒ Object

used to store the calculation of CPU since last sample



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# File 'lib/server_metrics/collectors/processes.rb', line 150

def recent_cpu_percentage
  @recent_cpu_percentage
end

Instance Method Details

#combined_cpu ⇒ Object 



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# File 'lib/server_metrics/collectors/processes.rb', line 159

def combined_cpu
  # best thread I've seen on cutime vs utime & cstime vs stime: https://www.ruby-forum.com/topic/93176
  # * cutime and cstime include CPUusage of child processes
  # * utime and stime don't include CPU usage of child processes
  (utime || 0) + (stime || 0)  # utime and stime aren't available on mac. Result is %cpu is 0 on mac.
end

#has?(method_name) ⇒ Boolean

because apparently respond_to doesn’t work through method_missing

Returns:

  • (Boolean) 


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# File 'lib/server_metrics/collectors/processes.rb', line 156

def has?(method_name)
  @pts.respond_to?(method_name)
end