//File: DAISDAIO.idl
#ifndef _DAIS_DAIO_IDL
#define _DAIS_DAIO_IDL
#pragma prefix "omg.org"
#include <DAISCommon.idl>

module DAIS {
module DataAccess {
module IO {

enum DataSource { 
    DS_CACHE, 
    DS_DEVICE
};

struct ItemState 
{

	SimpleValue								value;
	DateTime								time_stamp;
	Quality									dais_quality;
	ClientItemHandle						client_handle;

};
typedef sequence<ItemState>					ItemStates;

struct ItemUpdate
{
	ServerItemHandle						server_handle;
	SimpleValue								value;
};
typedef sequence<ItemUpdate>				ItemUpdates;

interface SyncIO 
{

	ItemStates sync_read (
		in	DataSource						data_source,

		in	ServerItemHandles				server_handles,
		out	ItemErrors						errors
    	);

	ItemErrors sync_write (

		in	ItemUpdates						updates
    	);
};

typedef unsigned long						CancelID;

interface AsyncIO
{
	exception NotConnected{string reason;};
	exception InvalidCancelID{string reason;};
	exception NotActive{string reason;};
	
	CancelID async_read (

		in	ServerItemHandles				server_handles,
		in	DataSource						data_source,
		in	unsigned long					transaction_id
	) raises (NotConnected, NotActive);

	CancelID async_write (

		in	ItemUpdates						updates,		
		in	unsigned long					transaction_id
	) raises (NotConnected);
	
	CancelID refresh (
		in	DataSource						data_source,
		in	unsigned long					transaction_id
	) raises (NotConnected,	NotActive);

	void cancel (
		in	CancelID						cancel_id
	) raises (InvalidCancelID);

	attribute boolean enabled;
};

interface Callback 
{

	void on_data_change (
		in	unsigned long					transaction_id,
		in	boolean							all_quality_good,
		in	ItemStates						states
	);

	void on_read_complete (
		in	unsigned long					transaction_id,
		in	boolean							all_quality_good,
		in	ItemStates						states,
		in	ItemErrors 						errors
	);

	void on_write_complete (
		in	unsigned long					transaction_id,
		in	ItemErrors 						errors
	);

	void on_cancel_complete (
		in	unsigned long					transaction_id
	);
};

interface ConnectionPoint
{

	attribute Callback						cllbck;
};};};};
#endif // _DAIS_DAIO_IDL