Change supervised to not be a mode

Modes will refer only to forked, async or inline.
Stub fork mode for now.

Author: rosa

lib/solid_queue/processes/runnable.rb

@@ -13,7 +13,7 @@ def start
         run_callbacks(:boot) { boot }
       end
 
-      if mode.async?
+      if running_async?
         @thread = Thread.new { run }
       else
         run
@@ -33,7 +33,7 @@ def mode
       end
 
       def boot
-        if supervised?
+        if running_as_fork?
           register_signal_handlers
           set_procline
         end
@@ -65,5 +65,13 @@ def set_procline
       def running_inline?
         mode.inline?
       end
+
+      def running_async?
+        mode.async?
+      end
+
+      def running_as_fork?
+        mode.fork?
+      end
   end
 end

lib/solid_queue/processes/supervised.rb

@@ -9,7 +9,6 @@ module Supervised
     end
 
     def supervised_by(process)
-      self.mode = :supervised
       @supervisor = process
     end
 
@@ -19,11 +18,11 @@ def set_procline
       end
 
       def supervisor_went_away?
-        supervised? && supervisor&.pid != ::Process.ppid
+        supervised? && supervisor.pid != ::Process.ppid
       end
 
       def supervised?
-        mode.supervised?
+        supervisor.present?
       end
 
       def register_signal_handlers

lib/solid_queue/supervisor.rb

@@ -127,6 +127,7 @@ def release_orphaned_executions
 
       def start_fork(configured_process)
         configured_process.supervised_by process
+        configured_process.mode = :fork
 
         pid = fork do
           configured_process.start