select operation on a channel list

Author: mighe

lib/concurrent.rb

@@ -33,6 +33,7 @@
 require 'concurrent/utilities'
 
 require 'concurrent/channel/probe'
+require 'concurrent/channel/channel'
 require 'concurrent/channel/unbuffered_channel'
 
 require 'concurrent/cached_thread_pool'

lib/concurrent/channel/channel.rb

@@ -0,0 +1,10 @@
+module Concurrent
+  class Channel
+    def self.select(*channels)
+      probe = Probe.new
+
+      channels.each { |channel| channel.select(probe) }
+      probe.value
+    end
+  end
+end

spec/concurrent/channel/channel_spec.rb

@@ -0,0 +1,24 @@
+require 'spec_helper'
+
+module Concurrent
+
+  describe Channel do
+
+    describe '.select' do
+
+      context 'without timeout' do
+        it 'returns the first value available on a channel' do
+          channels = [ UnbufferedChannel.new, UnbufferedChannel.new]
+
+          Thread.new { channels[1].push 77 }
+
+          value = Channel.select(*channels)
+
+          value.should eq 77
+        end
+      end
+
+    end
+
+  end
+end