Explicitly closing journal on rotate

Author: ewolinetz

fluent-plugin-systemd.gemspec

@@ -22,5 +22,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "test-unit", "~> 2.5"
 
   spec.add_runtime_dependency "fluentd", "~> 0.12"
-  spec.add_runtime_dependency "systemd-journal", "~> 1.2"
+  spec.add_runtime_dependency "systemd-journal", "~> 1.3"
 end

lib/fluent/plugin/in_systemd.rb

@@ -35,6 +35,7 @@ def shutdown
     private
 
     def init_journal
+      @journal.close if @journal # rubocop:disable Style/SafeNavigation
       @journal = Systemd::Journal.new(path: @path)
       # make sure initial call to wait doesn't return :invalidate
       # see https://github.com/ledbettj/systemd-journal/issues/70