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Notification Service

Notification Service. Outline Notification Service Event Service vs Notification Service Example. Shortcomings of Event Services. No filtering: all notifications sent to an event channel will be forwarded to all consumers

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Notification Service

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  1. Notification Service • Outline • Notification Service • Event Service vs Notification Service • Example Notification Service

  2. Shortcomings of Event Services • No filtering: all notifications sent to an event channel will be forwarded to all consumers • No Concept of QoS: client cannot configure channels for their specific requirements • No information about required or supplied notifications: consumer doesn’t know about existing suppliers and the types of events they offer; vice versa • Unstructured event data: event data is wrapped into instances of the generic type Any Notification Service

  3. Notification Service Architecture Text book: figure 11.7 Notification Service

  4. Notification Service vs Event Service • Event types • Notification Service supports typed, any, structured and sequence of structured events • Event service only supports typed and any type event • Admin interface • Notification service allows multiple consumer admin interface and supplier admin interface • Event service only support single admin interface (ConsumerAdmin, SupplierAdmin) • Channel creation • Notification service defines a standard factory interface for event channels to allow clients to retrieve channels • Event service does not have the factory interface Notification Service

  5. Structured Event domain_name Fixed Header type_name event_name Event Header name value name value Variable Header … name value name value Filterable Body Fields … Event Body name value Remaining Body remainder_of_body Notification Service

  6. QoS Properties • EventReliability and ConnectionReliability • 0: best effort • 1: persistent, retransmit after recover • Priority • Default 0, could be positive, or negtive • StartTime, StopTime, Timeout • MaxEventsPerConsumer • OrderPrority • DiscardPolicy • MaximumBatchSize • PacingInterval • Text book Figure 11.9 Notification Service

  7. Filters • CosNotifyFilter::Filter • Decide when to forward the event consumer • CosNotifyFilter::MappingFilter • Affact how the QoS values are treated • Priority • Lifetime • For consumer only (ConsumerAdmin, or SupplierProxy) Notification Service

  8. CosNotifyChannelAdmin:Event Channel interface EventChannel : CosNotification::QoSAdmin, CosNotification::AdminPropertiesAdmin, CosEventChannelAdmin::EventChannel { readonly attribute EventChannelFactory MyFactory; readonly attribute ConsumerAdmin default_consumer_admin; readonly attribute SupplierAdmin default_supplier_admin; readonly attribute CosNotifyFilter::FilterFactory default_filter_factory; ConsumerAdmin new_for_consumers( in InterFilterGroupOperator op, out AdminID id ); SupplierAdmin new_for_suppliers( in InterFilterGroupOperator op, out AdminID id ); ConsumerAdmin get_consumeradmin ( in AdminID id ) raises (AdminNotFound); SupplierAdmin get_supplieradmin ( in AdminID id ) raises (AdminNotFound); AdminIDSeq get_all_consumeradmins(); AdminIDSeq get_all_supplieradmins(); }; // EventChannel Notification Service

  9. CosNotifyChannelAdmin:ConsumerAdmin interface ConsumerAdmin : CosNotification::QoSAdmin, CosNotifyComm::NotifySubscribe, CosNotifyFilter::FilterAdmin, CosEventChannelAdmin::ConsumerAdmin { readonly attribute AdminID MyID; readonly attribute EventChannel MyChannel; readonly attribute InterFilterGroupOperator MyOperator; attribute CosNotifyFilter::MappingFilter priority_filter; attribute CosNotifyFilter::MappingFilter lifetime_filter; readonly attribute ProxyIDSeq pull_suppliers; readonly attribute ProxyIDSeq push_suppliers; ProxySupplier get_proxy_supplier ( in ProxyID proxy_id ) raises ( ProxyNotFound ); ProxySupplier obtain_notification_pull_supplier ( in ClientType ctype, out ProxyID proxy_id) raises ( AdminLimitExceeded ); ProxySupplier obtain_notification_push_supplier ( in ClientType ctype, out ProxyID proxy_id) raises ( AdminLimitExceeded ); void destroy(); }; // ConsumerAdmin Notification Service

  10. CosNotifyChannelAdmin:SupplierAdmin interface SupplierAdmin : CosNotification::QoSAdmin, CosNotifyComm::NotifyPublish, CosNotifyFilter::FilterAdmin, CosEventChannelAdmin::SupplierAdmin { readonly attribute AdminID MyID; readonly attribute EventChannel MyChannel; readonly attribute InterFilterGroupOperator MyOperator; readonly attribute ProxyIDSeq pull_consumers; readonly attribute ProxyIDSeq push_consumers; ProxyConsumer get_proxy_consumer ( in ProxyID proxy_id ) raises ( ProxyNotFound ); ProxyConsumer obtain_notification_pull_consumer ( in ClientType ctype, out ProxyID proxy_id) raises ( AdminLimitExceeded ); ProxyConsumer obtain_notification_push_consumer ( in ClientType ctype, out ProxyID proxy_id) raises ( AdminLimitExceeded ); void destroy(); }; // SupplierAdmin Notification Service

  11. CosNotifyChannelAdmin:Event Channel Factory interface EventChannelFactory { EventChannel create_channel ( in CosNotification::QoSProperties initial_qos, in CosNotification::AdminProperties initial_admin, out ChannelID id) raises(CosNotification::UnsupportedQoS, CosNotification::UnsupportedAdmin ); ChannelIDSeq get_all_channels(); EventChannel get_event_channel ( in ChannelID id ) raises (ChannelNotFound); }; // EventChannelFactory Notification Service

  12. CosNotifyFilter:FilterAdmin interface FilterAdmin { FilterID add_filter ( in Filter new_filter ); void remove_filter ( in FilterID filter ) raises ( FilterNotFound ); Filter get_filter ( in FilterID filter ) raises ( FilterNotFound ); FilterIDSeq get_all_filters(); void remove_all_filters(); }; // FilterAdmin Notification Service

  13. CosNotifyFilter:Filter interface Filter { readonly attribute string constraint_grammar; ConstraintInfoSeq add_constraints ( in ConstraintExpSeq constraint_list) raises (InvalidConstraint); void modify_constraints ( in ConstraintIDSeq del_list, in ConstraintInfoSeq modify_list) raises (InvalidConstraint, ConstraintNotFound); ConstraintInfoSeq get_constraints( in ConstraintIDSeq id_list) raises (ConstraintNotFound); ConstraintInfoSeq get_all_constraints(); void remove_all_constraints(); void destroy(); boolean match ( in any filterable_data ) raises (UnsupportedFilterableData); boolean match_structured ( in CosNotification::StructuredEvent filterable_data ) raises (UnsupportedFilterableData); boolean match_typed ( in CosNotification::PropertySeq filterable_data ) raises (UnsupportedFilterableData); CallbackID attach_callback ( in CosNotifyComm::NotifySubscribe callback); void detach_callback ( in CallbackID callback) raises ( CallbackNotFound ); CallbackIDSeq get_callbacks(); }; // Filter Notification Service

  14. CosNotifyFilter:FilterFactory interface FilterFactory { Filter create_filter ( in string constraint_grammar) raises (InvalidGrammar); MappingFilter create_mapping_filter ( in string constraint_grammar, in any default_value) raises(InvalidGrammar); }; // FilterFactory Notification Service

  15. CosNotification module CosNotification { typedef string Istring; typedef Istring PropertyName; typedef any PropertyValue; struct Property { PropertyName name; PropertyValue value; }; typedef sequence<Property> PropertySeq; typedef PropertySeq OptionalHeaderFields; typedef PropertySeq FilterableEventBody; typedef PropertySeq QoSProperties; typedef PropertySeq AdminProperties; struct EventType{ string domain_name; string type_name; }; typedef sequence<EventType> EventTypeSeq; }; Notification Service

  16. CosNotification module CosNotification { struct FixedEventHeader { EventType event_type; string event_name; }; struct EventHeader { FixedEventHeader fixed_header; OptionalHeaderFields variable_header; }; struct StructuredEvent { EventHeader header; FilterableEventBody filterable_data; any remainder_of_body; }; typedef sequence<StructuredEvent> EventBatch; }; Notification Service

  17. QoS Admin module CosNotification { interface QoSAdmin { QoSProperties get_qos(); void set_qos ( in QoSProperties qos) raises ( UnsupportedQoS ); void validate_qos ( in QoSProperties required_qos, out NamedPropertyRangeSeq available_qos ) raises ( UnsupportedQoS ); }; // QosAdmin const string MaxQueueLength = "MaxQueueLength"; const string MaxConsumers = "MaxConsumers"; const string MaxSuppliers = "MaxSuppliers"; const string RejectNewEvents = "RejectNewEvents"; }; Notification Service

  18. AdminPropertiesAdmin module CosNotification { interface AdminPropertiesAdmin { AdminProperties get_admin(); void set_admin (in AdminProperties admin) raises ( UnsupportedAdmin ); }; }; // CosNotification Notification Service

  19. Notification Interface module CosNotifyComm { exception InvalidEventType { CosNotification::EventType type; }; interface NotifyPublish { void offer_change ( in CosNotification::EventTypeSeq added, in CosNotification::EventTypeSeq removed ) raises ( InvalidEventType ); }; // NotifyPublish interface NotifySubscribe { void subscription_change( in CosNotification::EventTypeSeq added, in CosNotification::EventTypeSeq removed ) raises ( InvalidEventType ); }; // NotifySubscribe }; Notification Service

  20. Consumer and Supplier module CosNotifyComm { interface PushConsumer : NotifyPublish, CosEventComm::PushConsumer { }; // PushConsumer interface PullConsumer : NotifyPublish, CosEventComm::PullConsumer { }; // PullConsumer interface PullSupplier : NotifySubscribe, CosEventComm::PullSupplier { }; // PullSupplier interface PushSupplier : NotifySubscribe, CosEventComm::PushSupplier { }; }; Notification Service

  21. Structured Consumer module CosNotifyComm { interface StructuredPushConsumer : NotifyPublish { void push_structured_event( in CosNotification::StructuredEvent notification) raises(CosEventComm::Disconnected); void disconnect_structured_push_consumer(); }; // StructuredPushConsumer interface StructuredPullConsumer : NotifyPublish { void disconnect_structured_pull_consumer(); }; // StructuredPullConsumer }; Notification Service

  22. Structured Supplier module CosNotifyComm { interface StructuredPullSupplier : NotifySubscribe { CosNotification::StructuredEvent pull_structured_event() raises(CosEventComm::Disconnected); CosNotification::StructuredEvent try_pull_structured_event( out boolean has_event) raises(CosEventComm::Disconnected); void disconnect_structured_pull_supplier(); }; // StructuredPullSupplier interface StructuredPushSupplier : NotifySubscribe { void disconnect_structured_push_supplier(); }; // StructuredPushSupplier }; Notification Service

  23. Sequence Consumer module CosNotifyComm { interface SequencePushConsumer : NotifyPublish { void push_structured_events( in CosNotification::EventBatch notifications) raises(CosEventComm::Disconnected); void disconnect_sequence_push_consumer(); }; // SequencePushConsumer interface SequencePullConsumer : NotifyPublish { void disconnect_sequence_pull_consumer(); }; // SequencePullConsumer }; Notification Service

  24. Sequence Supplier module CosNotifyComm { interface SequencePullSupplier : NotifySubscribe { CosNotification::EventBatch pull_structured_events( in long max_number ) raises(CosEventComm::Disconnected); CosNotification::EventBatch try_pull_structured_events( in long max_number, out boolean has_event) raises(CosEventComm::Disconnected); void disconnect_sequence_pull_supplier(); }; // SequencePullSupplier interface SequencePushSupplier : NotifySubscribe { void disconnect_sequence_push_supplier(); }; // SequencePushSupplier }; Notification Service

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