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-/* -*- C++ -*- */
-// $Id$
-
-// ============================================================================
-//
-// = LIBRARY
-// EventComm
-//
-// = FILENAME
-// Event_Comm.idl
-//
-// = DESCRIPTION
-// The CORBA IDL module for distributed event notification.
-//
-// = AUTHOR
-// Douglas C. Schmidt (schmidt@cs.wustl.edu) and
-// Pradeep Gore (pradeep@cs.wustl.edu)
-//
-// ============================================================================
-
-#if !defined (_EVENT_COMM_IDL)
-#define _EVENT_COMM_IDL
-
-module Event_Comm
-{
- // = TITLE
- // The CORBA IDL module for distributed event notification.
-
- struct Event
- {
- // = TITLE
- // Defines the interface for an event <Event>.
- //
- // = DESCRIPTION
- // This is the type passed by the Notifier to the Consumer.
- // Since it contains an <any>, it can hold any type. Naturally,
- // the consumer must understand how to interpret this!
-
- string tag_;
- // Tag for the event. This is used by the <Notifier> to compare
- // with the <Consumer>s' filtering criteria.
-
- any value_;
- // An event can contain anything.
-
- Object object_ref_;
- // Object reference for callbacks.
- };
-
- interface Consumer
- {
- // = TITLE
- // Defines the interface for a <Consumer> of events.
-
- void push (in Event event);
- // Inform the <Consumer> that <event> has occurred.
-
- void disconnect (in string reason);
- // Disconnect the <Consumer> from the <Notifier>,
- // giving it the <reason>.
- };
-
- interface Notifier
- {
- // = TITLE
- // Defines the interface for a <Notifier> of events.
-
- exception CannotSubscribe
- {
- // = TITLE
- // This exception in thrown when a <subscribe> fails.
-
- string reason_;
- };
-
- exception CannotUnsubscribe
- {
- // = TITLE
- // This exception in thrown when a <unsubscribe> fails.
-
- string reason_;
- };
-
- // = The following operations are intended for Suppliers.
-
- void disconnect (in string reason);
- // Disconnect all the receivers, giving them the <reason>.
-
- void push (in Event event);
- // Send the <event> to all the consumers who have subscribed and
- // who match the filtering criteria.
-
- // = The following operations are intended for Consumers.
-
- void subscribe (in Consumer Consumer,
- in string filtering_criteria);
- // Subscribe the <Consumer> to receive events that match the
- // regular expresssion <filtering_criteria> applied by the
- // <Notifier>. If <filtering_criteria> is "" then all events are
- // matched.
-
- void unsubscribe (in Consumer Consumer,
- in string filtering_criteria);
- // Unsubscribe the <Consumer> that matches the filtering criteria.
- // If <filtering_criteria> is "" then all <Consumers> with the
- // matching object reference are removed.
- };
-};
-
-#endif /* _EVENT_COMM_IDL */