1 files changed, 62 insertions, 0 deletions
diff --git a/lib/chef/event_loggers/base.rb b/lib/chef/event_loggers/base.rb
new file mode 100644
index 0000000000..1f676dd516
--- /dev/null
+++ b/lib/chef/event_loggers/base.rb
@@ -0,0 +1,62 @@
+#
+# Author:: Jay Mundrawala (<jdm@getchef.com>)
+#
+# Copyright:: 2014, Chef Software, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'chef/event_dispatch/base'
+
+class Chef
+  module EventLoggers
+    class UnknownEventLogger < StandardError; end
+    class UnavailableEventLogger < StandardError; end
+
+    def self.event_loggers_by_name
+      @event_loggers_by_name ||= {}
+    end
+
+    def self.register(name, logger)
+      event_loggers_by_name[name.to_s] = logger
+    end
+
+    def self.by_name(name)
+      event_loggers_by_name[name]
+    end
+
+    def self.available_event_loggers
+      event_loggers_by_name.select do |key, val|
+        val.available?
+      end.keys
+    end
+
+    def self.new(name)
+      event_logger_class = by_name(name.to_s) or
+        raise UnknownEventLogger, "No event logger found for #{name} (available: #{available_event_loggers.join(', ')})"
+      raise UnavailableEventLogger unless available_event_loggers.include? name.to_s
+      event_logger_class.new
+    end
+
+    class Base < EventDispatch::Base
+      def self.short_name(name)
+        Chef::EventLoggers.register(name, self)
+      end
+
+      # Returns true if this implementation of EventLoggers can be used
+      def self.available?
+        false
+      end
+    end
+  end
+end