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# frozen_string_literal: true
module VMInsights
# Design assumptions:
# 1. Changing the number of active CPUs requires a system reboot.
# 2. Assumption #1 is something that could change as virtualization technology evolves.
# So:
# 1. Gather the value once and cache it.
# 2. Design the API so that the number of active CPUs is part of the data requested for each sample.
class IDataCollector
# return:
# Hash with elements:
# :total_time - cummulative system total time
# :idle - cummulative system idle time
def baseline
not_implemented
end
def start_sample
not_implemented
end
# returns: free, total
def get_available_memory_kb
not_implemented
end
# returns: cummulative total time, cummulative idle time
def get_cpu_idle
not_implemented
end
# returns:
# number of CPUs available for scheduling tasks
# raises:
# Unavailable if not available
def get_number_of_cpus
not_implemented
end
# return:
# An array of objects with methods:
# mount_point
# size_in_bytes
# free_space_in_bytes
# device_name
def get_filesystems
not_implemented
end
# given:
# block device name
# returns:
# an object with methods:
# reads since last call or baseline
# bytes_read since last call or baseline, nil if not available
# writes since last call or baseline
# bytes_written since last call or baseline, nil if not available
# delta_time time, in seconds, since last sample
# raises:
# Unavailable if not available
# reference:
# https://www.mjmwired.net/kernel/Documentation/iostats.txt
def get_disk_stats(dev)
# /sys/class/block/sda2/stat
not_implemented
end
# returns:
# An array of objects with methods:
# device
# bytes_received since last call or baseline
# bytes_sent since last call or baseline
# delta_time time, in seconds, since last sample
# Note: Only devices that are "UP" or had activity are included
def get_net_stats
not_implemented
end
def end_sample
not_implemented
end
class Unavailable < StandardError
def initialize(msg)
super msg
end
end
private
def not_implemented
raise RuntimeError, "not implemented"
end
end # DataCollector
end #module