From: Erik Veenstra <erikveen@...>
Date: 2008-07-13T19:13:06+09:00
Subject: ThreadLimiter 0.1.0

ThreadLimiter 0.1.0 is released.

 RDoc:     http://www.erikveen.dds.nl/threadlimiter/doc/index.html
 Download: http://rubyforge.org/projects/threadlimiter/index.html

gegroet,
Erik V. - http://www.erikveen.dds.nl/

----------------------------------------------------------------

ThreadLimiter forks threads like Thread.fork(), but limits the
number of concurrently running threads.

ThreadLimiter isn't a thread pool. Each fork really starts a
new thread.

Example: Get the titles of a large collections of URL's.

The traditional way, using Thread directly:

  urls           = [.....]                 # A lot of URL's. Maybe
even thousends.

  titles =
  urls.collect do |url|
    Thread.fork do
      # ... get the title of the url...
    end
  end.collect do |thread|
    thread.value
  end

With ThreadLimiter#fork():

  thread_limiter = ThreadLimiter.new(10)   # Max. 10 concurrently
running threads.
  urls           = [.....]                 # A lot of URL's. Maybe
even thousends.

  titles =
  urls.collect do |url|
    thread_limiter.fork do
      # ... get the title of the url...
    end
  end.collect do |thread|
    thread.value
  end

With Enumerable#threaded_collect():

  urls           = [.....]                 # A lot of URL's. Maybe
even thousends.

  titles =
  urls.threaded_collect(10) do |url|       # Max. 10 concurrently
running threads.
    # ... get the title of the url...
  end

----------------------------------------------------------------