Add an example for long polling using Cramp::LongPolling

Author: lifo

examples/long_poll.ru

@@ -0,0 +1,36 @@
+require "rubygems"
+require "bundler"
+Bundler.setup(:default, :example)
+
+require 'cramp'
+require 'thin'
+
+class LazyController < Cramp::LongPolling
+  on_start :init_limit
+  periodic_timer :check_limit, :every => 1
+
+  def init_limit
+    @limit = 0
+  end
+
+  def check_limit
+    @limit += 1
+
+    if @limit > 20
+      puts "And the wait is over !!!"
+
+      # Send back a response to the client. Terminate the request.
+      render "Hello World!"
+    else
+      puts "You must wait"
+    end
+  end
+
+  def respond_with
+    [200, {'Content-Type' => 'text/plain'}]
+  end
+
+end
+
+# bundle exec thin -V -R examples/long_poll.ru start
+run LazyController

lib/cramp/long_polling.rb

@@ -1,4 +1,5 @@
 module Cramp
+  # All the usual Cramp::Action stuff. But the request is terminated as soon as render() is called.
   class LongPolling < Abstract
     include PeriodicTimer
     include KeepConnectionAlive