<snip>
Thanks! I shall study this code (there's a few new idioms that I
haven't used before) and report back early next week on the
performance improvements.
try this one - it's another order of magnitude faster:
harp:~ > ruby a.rb
#<PlayerData:0xb75cc0b4 @to_s=nil, @data=[400, 1.0, 2.0, 3.0, 42], @to_bin=nil>
400
1.0
42
pid : 400, x_position : 1.0, y_position : 2.0, z_position : 3.0, foobar : 42
creations per second : 114797
harp:~ > cat a.rb
class PlayerData
class << self
def create(*a)
new(a.pack(FORMAT))
end
end
SPEC = [
%w( pid i ),
%w( x_position f ),
%w( y_position f ),
%w( z_position f ),
%w( foobar i ),
]
ATTRIBUTES = SPEC.map{|s| s.first}
FORMAT = SPEC.map{|s| s.last}.join
SPEC.each_with_index do |spec, ix|
at, format = spec
eval <<-src
def #{ at }
@#{ at } ||= @data[#{ ix }]
end
def #{ at }= value
raise TypeError unless self.#{ at }.class == value.class
uncache
@#{ at } = @data[#{ ix }] = value
end
src
end
def update buffer
uncache
@data = buffer.unpack FORMAT
end
alias initialize update
def uncache
@to_s = @to_bin = nil
end
def to_s
@to_s ||= ATTRIBUTES.inject(''){|s,a| s << "#{ a } : #{ send a }, " }.chop.chop
end
def to_bin
@to_bin ||= @data.pack(FORMAT)
end
end
id, x_position, y_position, z_position, foobar =
400, 1.0, 2.0, 3.0, 0b101010
pd = PlayerData::create id, x_position, y_position, z_position, foobar
p pd
p pd.pid
p pd.x_position
p pd.foobar
puts pd
begin
require 'timeout'
n = 0
sec = 10
Timeout::timeout(sec) do
loop do
PlayerData::create id, x_position, y_position, z_position, foobar
n += 1
end
end
rescue Timeout::Error
puts "creations per second : #{ n / sec }"
end
basically it just unpacks everything and then uses lazy evaluation to get the
values when asked. it's hard to imagine getting faster than this, but someone
will surely prove me wrong 
hth.
-a
···
On Sun, 14 Aug 2005, Joe Van Dyk wrote:
On Sun, 14 Aug 2005, Joe Van Dyk wrote:
--
email :: ara [dot] t [dot] howard [at] noaa [dot] gov
phone :: 303.497.6469
Your life dwells amoung the causes of death
Like a lamp standing in a strong breeze. --Nagarjuna
===============================================================================
