note

	description: "A timer manager implementation"
	legal: "See notice at end of class.";
	status: "See notice at end of class.";
	date: "$Date$";
	revision: "$Revision$"

deferred class

	TIMER_I 

inherit

	G_ANY
		export
			{NONE} all
		end
	
feature -- Status report

	is_call_back_set: BOOLEAN
			-- Is a call back already set ?
		deferred
		end;

	is_regular_call_back: BOOLEAN
			-- Is the call back set a regular one ?
		require
			is_call_back_set
		deferred
		end;

feature -- Status setting

	set_next_call_back (a_delay: INTEGER; a_command: COMMAND; an_argument: ANY)-- Set `a_command' with `argument' to execute when `a_delay';
			-- in milliseconds has expired.
		require
			no_call_back_already_set: not is_call_back_set;
			a_delay_positive_and_not_null: a_delay > 0;
			not_a_command_void: a_command /= Void
		deferred
		ensure
			is_call_back_set and (not is_regular_call_back)
		end;

	set_no_call_back
			-- Remove any call-back already set.
		require
			a_call_back_must_be_set: is_call_back_set
		deferred
		ensure
			not is_call_back_set
		end;

	set_regular_call_back (a_time: INTEGER; a_command: COMMAND; an_argument: ANY)
			-- Set `a_command' with `argument' to execute all the `a_time'
			-- milliseconds.
		require
			no_call_back_already_set: not is_call_back_set;
			a_time_positive_and_not_null: a_time >0;
			not_a_command_void: a_command /= Void
		deferred
		ensure
			is_call_back_set and is_regular_call_back
		end;

	destroy
		deferred
		end

note
	copyright:	"Copyright (c) 1984-2006, Eiffel Software and others"
	license:	"Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	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 TIMER_I