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/* -*- C++ -*- */
// @(#)Event_Comm.idl 1.1 10/18/96
// ============================================================================
//
// = LIBRARY
// EventComm
//
// = FILENAME
// Event_Comm.idl
//
// = DESCRIPTION
// The CORBA IDL module for distributed event notification.
//
// = AUTHOR
// Douglas C. Schmidt (schmidt@cs.wustl.edu)
//
// ============================================================================
#ifndef _EVENT_COMM_IDL
#define _EVENT_COMM_IDL
module Event_Comm
// = TITLE
// The CORBA IDL module for distributed event notification.
//
// = DESCRIPTION
{
struct Notification
// = TITLE
// Defines the interface for an event <Notification>.
//
// = This is the type passed by the Notifier to the Notification_Receiver.
// Since it contains an <any>, it can hold any values. Naturally,
// the consumer must understand how to interpret this!
{
string tag_;
// Tag for the notification.
// any value_;
// A notification can contain anything.
// Object object_ref_;
// Object reference for callbacks.
};
interface Notification_Receiver
// = TITLE
// Defines the interface for a <Notification_Receiver> of events.
// Note that all operations are <oneway> to avoid blocking.
//
// = DESCRIPTION
{
oneway void receive_notification (in Notification notification);
// Inform the <Notification_Receiver> that <event> has occurred.
oneway void disconnect (in string reason);
// Disconnect the <Notification_Receiver> from the <Notifier>,
// giving it the <reason>.
};
interface Notifier
// = TITLE
// Defines the interface for a <Notifier> of events.
//
// = DESCRIPTION
{
oneway void send_disconnect (in string reason);
// Disconnect all the receivers, giving them the <reason>.
oneway void send_notification (in Notification notification);
// Send the <Notification> to all the consumers who
// have subscribed and who match the filtering criteria.
oneway void subscribe (in Notification_Receiver notification_receiver,
in string filtering_criteria);
// Subscribe the <Notification_Receiver> to receive events that
// match the regular expresssion <filtering_criteria> applied by
// the <Notifier>. If <filtering_criteria> is "" then all events
// are matched.
oneway void unsubscribe (in Notification_Receiver notification_receiver,
in string filtering_criteria);
// Unsubscribe the <Notification_Receiver> that matches the
// filtering criteria. If <filtering_criteria> is "" then
// all <Notification_Receivers> with the matching object reference
// are removed.
};
};
#endif /* _EVENT_COMM_IDL */
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