- Switch to using SizedQueues for internal messaging

http://code.google.com/p/logstash/issues/detail?id=44

lib/logstash/agent.rb

@@ -10,6 +10,9 @@ require "uri"
 
 JThread = java.lang.Thread
 
+# TODO(sissel): only enable this if we are in debug mode.
+# JRuby.objectspace=true
+
 # Collect logs, ship them out.
 class LogStash::Agent
   attr_reader :config
@@ -73,7 +76,8 @@ class LogStash::Agent
     end
 
     # NOTE(petef) we should use a SizedQueue here (w/config params for size)
-    filter_queue = Queue.new
+    #filter_queue = Queue.new
+    filter_queue = SizedQueue.new(10)
     output_queue = MultiQueue.new
 
     input_target = @filters.length > 0 ? filter_queue : output_queue
@@ -89,7 +93,7 @@ class LogStash::Agent
 
     # Create N filter-worker threads
     if @filters.length > 0
-      3.times do |n|
+      1.times do |n|
         @logger.info("Starting filter worker thread #{n}")
         @threads["filter|worker|#{n}"] = Thread.new do
           JThread.currentThread().setName("filter|worker|#{n}")
@@ -120,7 +124,7 @@ class LogStash::Agent
 
     # Create output threads
     @outputs.each do |output|
-      queue = Queue.new
+      queue = SizedQueue.new(10)
       output_queue.add_queue(queue)
 
       @threads["outputs/#{output}"] = Thread.new do
@@ -134,13 +138,9 @@ class LogStash::Agent
       end # Thread.new
     end # @outputs.each
 
-
-#    # Register any signal handlers
-#    #register_signal_handler
-#
     while sleep 5
     end
-  end # def register
+  end # def run
 
   public
   def stop
@@ -175,19 +175,10 @@ class LogStash::Agent
 
   public
   def register_signal_handler
-    @sigchannel = EventMachine::Channel.new
-    Signal.trap("USR1") do
-      @sigchannel.push(:USR1)
-    end
-
-    Signal.trap("INT") do
-      @sigchannel.push(:INT)
-    end
-
-    @sigchannel.subscribe do |msg|
+    # TODO(sissel): This doesn't work well in jruby since ObjectSpace is disabled
+    # by default.
+    Signal.trap("USR2") do
       # TODO(sissel): Make this a function.
-      case msg
-      when :USR1
       counts = Hash.new { |h,k| h[k] = 0 }
       ObjectSpace.each_object do |obj|
         counts[obj.class] += 1
@@ -203,11 +194,6 @@ class LogStash::Agent
       counts.sort { |a,b| a[1] <=> b[1] or a[0] <=> b[0] }.each do |key, value|
         @logger.info("Class: [#{value}] #{key}")
       end
-      when :INT
-        @logger.warn("SIGINT received. Shutting down.")
-        # TODO(petef): Should have input/output/filter register shutdown
-        # hooks.
-      end # case msg
-    end # @sigchannel.subscribe
+    end # SIGUSR1
   end # def register_signal_handler
 end # class LogStash::Agent