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Contents
=begin rdoc
Monitor
This provides the interface to monitors in a clouds.rb configuration file
== Usage
PoolParty::Monitor.new(:cpu) do |c|
vote_for(:expand) if c > 0.8
configure if c < 0.1
end
The methods inside the block will be executed on the cloud with the value
retrieved by the monitor.
=end
module PoolParty
class Monitor
attr_reader :name, :monitor_block
def initialize(monitor_name, &block)
msg =<<-EOE
You must pass a block with your monitor
Example:
monitor :cpu do |c|
vote_for(:expand) if c > 0.8
configure if c < 0.1
end
EOE
raise PoolPartyError.create("MonitorDefinitionError", msg) unless block
@name = monitor_name
@monitor_block = block
end
# Run the block given with the monitor
# with the given values on run. Clear the methods
# hash out so they don't conflict with the previous values
# retrieved and return the methods available.
def run(val)
@methods = nil
instance_exec val, &monitor_block
methods
end
private
# We don't want the methods actually executing since we are executing the methods
# in a cloud, we just want to store the output values of the
# methods, so we'll store them in a hash with the method as the key
# and the value of the method as the value in an array
def method_missing(meth,*a,&block)
(methods[meth] ||= []) << a
methods[meth].flatten!
end
# Local storage for the methods
def methods
@methods ||= {}
end
end
end
Version data entries
17 entries across 17 versions & 3 rubygems