note
	description: "Shared instance of logger"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date$"
	revision: "$Revision$"

class
	SHARED_LOGGER

feature -- Access

	Log_source: STRING = "Eiffel Metadata Consumer"
			-- Windows event log source

	Log_name: STRING = "Application"
			-- Name of log where to log events

feature -- Status Report

	source_ready: BOOLEAN
			-- Is log source initialized?
		do
			Result := {SYSTEM_DLL_EVENT_LOG}.source_exists (Log_source)
		end

feature -- Basic Operations

	log_last_exception
			-- Log last exception to Windows event log.
		require
			source_ready: source_ready
		local
			l_log: SYSTEM_DLL_EVENT_LOG
		do
			if attached {ISE_RUNTIME}.last_exception as l_exception then
				create l_log.make (Log_name, ".", Log_source)
				l_log.write_entry (l_exception.to_string, {SYSTEM_DLL_EVENT_LOG_ENTRY_TYPE}.error)
				l_log.close
			end
		end

	log_message (a_message: STRING)
			-- Log `a_message'.
		require
			source_ready: source_ready
			attached_message: a_message /= Void
		local
			l_log: SYSTEM_DLL_EVENT_LOG
		do
			create l_log.make (Log_name, ".", Log_source)
			l_log.write_entry (a_message.to_cil, {SYSTEM_DLL_EVENT_LOG_ENTRY_TYPE}.information)
			l_log.close
		end

	create_source
			-- Create event source if not already created.
		require
			source_not_ready: not source_ready
		local
			l_retried: BOOLEAN
		once
			if not l_retried then
				{SYSTEM_DLL_EVENT_LOG}.create_event_source (Log_source, Log_name)
			end
		rescue
			l_retried := True
			retry
		end

note
	copyright:	"Copyright (c) 1984-2006, Eiffel Software"
	license:	"GPL version 2 (see http://www.eiffel.com/licensing/gpl.txt)"
	licensing_options:	"http://www.eiffel.com/licensing"
	copying: "[
			This file is part of Eiffel Software's Eiffel Development Environment.
			
			Eiffel Software's Eiffel Development Environment is free
			software; you can redistribute it and/or modify it under
			the terms of the GNU General Public License as published
			by the Free Software Foundation, version 2 of the License
			(available at the URL listed under "license" above).
			
			Eiffel Software's Eiffel Development Environment is
			distributed in the hope that it will be useful,	but
			WITHOUT ANY WARRANTY; without even the implied warranty
			of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
			See the	GNU General Public License for more details.
			
			You should have received a copy of the GNU General Public
			License along with Eiffel Software's Eiffel Development
			Environment; if not, write to the Free Software Foundation,
			Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
		]"
	source: "[
			 Eiffel Software
			 356 Storke Road, Goleta, CA 93117 USA
			 Telephone 805-685-1006, Fax 805-685-6869
			 Website http://www.eiffel.com
			 Customer support http://support.eiffel.com
		]"


end -- class SHARED_LOGGER