Put debug log statement inside block

This prevents potentially expense calls to #inspect and avoids creating
a lot of useless string for applications that send a lot of messages to
actors.

Author: elspethsoup

lib/concurrent/actor/behaviour/abstract.rb

@@ -6,7 +6,6 @@ module Behaviour
       class Abstract
         include TypeCheck
         include InternalDelegations
-        include Concern::Logging
 
         attr_reader :core, :subsequent
 
@@ -42,7 +41,7 @@ def broadcast(public, event)
         def reject_envelope(envelope)
           envelope.reject! ActorTerminated.new(reference)
           dead_letter_routing << envelope unless envelope.future
-          log DEBUG, "rejected #{envelope.message} from #{envelope.sender_path}"
+          log(DEBUG) { "rejected #{envelope.message} from #{envelope.sender_path}"}
         end
       end
     end

lib/concurrent/actor/behaviour/sets_results.rb

@@ -14,7 +14,7 @@ def on_envelope(envelope)
           result = pass envelope
           if result != MESSAGE_PROCESSED && !envelope.future.nil?
             envelope.future.success result
-            log DEBUG, "finished processing of #{envelope.message.inspect}"
+            log(DEBUG) { "finished processing of #{envelope.message.inspect}"}
           end
           nil
         rescue => error

lib/concurrent/actor/context.rb

@@ -24,7 +24,6 @@ module Actor
     class AbstractContext
       include TypeCheck
       include InternalDelegations
-      include Concern::Logging
 
       attr_reader :core
 

lib/concurrent/actor/core.rb

@@ -91,7 +91,7 @@ def remove_child(child)
       # @param [Envelope] envelope
       def on_envelope(envelope)
         schedule_execution do
-          log DEBUG, "was #{envelope.future ? 'asked' : 'told'} #{envelope.message.inspect} by #{envelope.sender}"
+          log(DEBUG) { "was #{envelope.future ? 'asked' : 'told'} #{envelope.message.inspect} by #{envelope.sender}" }
           process_envelope envelope
         end
         nil
@@ -128,7 +128,7 @@ def schedule_execution
       end
 
       def broadcast(public, event)
-        log DEBUG, "event: #{event.inspect} (#{public ? 'public' : 'private'})"
+        log(DEBUG) { "event: #{event.inspect} (#{public ? 'public' : 'private'})" }
         @first_behaviour.on_event(public, event)
       end
 

lib/concurrent/actor/default_dead_letter_handler.rb

@@ -2,7 +2,7 @@ module Concurrent
   module Actor
     class DefaultDeadLetterHandler < RestartingContext
       def on_message(dead_letter)
-        log INFO, "got dead letter #{dead_letter.inspect}"
+        log(INFO) { "got dead letter #{dead_letter.inspect}"}
       end
     end
   end

lib/concurrent/actor/internal_delegations.rb

@@ -2,6 +2,7 @@ module Concurrent
   module Actor
     module InternalDelegations
       include PublicDelegations
+      include Logger::Severity
 
       # @see Core#children
       def children