Abstract: This disclosure provides methods and techniques of data replication involving cross replication group (RG) references. Example methods, systems, and techniques are disclosed regarding batch database replication (e.g., backup) and failover (e.g., automatic transition to a backup) between multiple database deployments or database providers. For example, a system causes database data to be stored in a primary deployment and replicated in one or more secondary deployments. In the event that data in the primary deployment is unavailable, transactions may be executed on one or more of the secondary deployments. When the original primary deployment becomes available again, any transactions executed on secondary deployments may be propagated to the primary deployment. The system may be configured such that queries on the database data are executed on the primary deployment at any time when the primary deployment is available.

Abstract: Systems and methods for providing targeted event notifications to subscribers are disclosed. In an example embodiment, events may be received from a publisher. The events may be categorized into a plurality of topics. The events may be distributed among brokers to process a topic selected from the plurality of topics based on the events. Further, it may be determined whether the topic exists in a list of topics handled by the brokers. Authentication credentials of the publisher may be validated, based on the determination. Based on the validation, queues of the events may be formed based on an order of receipt of the events. The events present in the queues may be filtered based on subscriptions of the events. For the fileted events, targeted even notifications may be forwarded to the subscribers.

Abstract: Systems and methods for filtering and routing event notifications to subscribers are disclosed. In an example embodiment, events from a publisher may be received. Each of the events may be associated with a topic, and the topic may be compared with topics present in broker metadata cache, based on one of prefixes and a fast lookup technique using a hash-table. Further, it may be determined whether the topic associated the events is present in the broker metadata cache based on comparison. Based upon determining, matching nodes for the events may be retrieved. Further, the events may be routed based on routing tables and availability of the matching nodes. Based on the routing, the events may be forwarded to the subscribers.

Abstract: Systems and methods for filtering and routing event notifications to subscribers are disclosed. In an example embodiment, events from a publisher may be received. Each of the events may be associated with a topic, and the topic may be compared with topics present in broker metadata cache, based on one of prefixes and a fast lookup technique using a hash-table. Further, it may be determined whether the topic associated the events is present in the broker metadata cache based on comparison. Based upon determining, matching nodes for the events may be retrieved. Further, the events may be routed based on routing tables and availability of the matching nodes. Based on the routing, the events may be forwarded to the subscribers.

Abstract: Systems and methods for dispatching targeted event notifications to subscribers are disclosed. In an embodiment, the system includes a receiver to receive events from a publisher. The system further comprises a router in communication with the receiver to route the events. The system further comprises a director to forward the targeted event notifications to the subscribers based on the routing. The director receives a delivery status of the targeted event notification from the subscribers. The delivery status includes one of success in receiving the targeted event notification and failure in receiving the targeted event notification. The director receives an event notification with the delivery status as failure in receiving the targeted event notification. The director places the targeted event notification in a delayed queue indicative of events to be delivered after a predefined time. The director re-transmits the targeted event notification to the subscribers based on the delayed queue.

Abstract: Systems and methods for dispatching targeted event notifications to subscribers are disclosed. In an example embodiment, a notification indicating creation of an even subscription by a subscriber may be received. An event source may be invoked to enable publishing of events corresponding to an event topic associated with the event subscription. A response from the event source for publishing of the events may be received and targeted event notifications may be forwarded to the subscribers on receiving the response.

Abstract: Publishing events. A method includes a publisher sending a message comprising one or more events to a domain. The domain is a container comprising a group of domain topics. Each domain topic in the domain is relevant by subject matter to the one or more events by virtue of belonging to the container. The method further includes, at the domain determining the appropriate domain topics from the group of domain topics for each event in the one or more events. The method further includes identifying subscribers to the appropriate domain topics. The method further includes sending notifications to the subscribers of the domain topics of the one or more events.

Abstract: Systems and methods for providing targeted event notifications to subscribers are disclosed. In an example embodiment, events may be received from a publisher. The events may be categorized into a plurality of topics. The events may be distributed among brokers to process a topic selected from the plurality of topics based on the events. Further, it may be determined whether the topic exists in a list of topics handled by the brokers. Authentication credentials of the publisher may be validated, based on the determination. Based on the validation, queues of the events may be formed based on an order of receipt of the events. The events present in the queues may be filtered based on subscriptions of the events. For the fileted events, targeted even notifications may be forwarded to the subscribers.

Abstract: Systems and methods for providing targeted event notifications to subscribers are disclosed. In an example embodiment, events may be received from a publisher. The events may be categorized into a plurality of topics. The events may be distributed among brokers to process a topic selected from the plurality of topics based on the events. Further, it may be determined whether the topic exists in a list of topics handled by the brokers. Authentication credentials of the publisher may be validated, based on the determination. Based on the validation, queues of the events may be formed based on an order of receipt of the events. The events present in the queues may be filtered based on subscriptions of the events. For the fileted events, targeted even notifications may be forwarded to the subscribers.

Abstract: Publishing events. A method includes a publisher sending a message comprising one or more events to a domain. The domain is a container comprising a group of domain topics. Each domain topic in the domain is relevant by subject matter to the one or more events by virtue of belonging to the container. The method further includes, at the domain determining the appropriate domain topics from the group of domain topics for each event in the one or more events. The method further includes identifying subscribers to the appropriate domain topics. The method further includes sending notifications to the subscribers of the domain topics of the one or more events.

Abstract: Systems and methods for dispatching targeted event notifications to subscribers are disclosed. In an example embodiment, a notification indicating creation of an even subscription by a subscriber may be received. An event source may be invoked to enable publishing of events corresponding to an event topic associated with the event subscription. A response from the event source for publishing of the events may be received and targeted event notifications may be forwarded to the subscribers on receiving the response.

Abstract: Systems and methods for filtering and routing event notifications to subscribers are disclosed. In an example embodiment, events from a publisher may be received. Each of the events may be associated with a topic, and the topic may be compared with topics present in broker metadata cache, based on one of prefixes and a fast lookup technique using a hash-table. Further, it may be determined whether the topic associated the events is present in the broker metadata cache based on comparison. Based upon determining, matching nodes for the events may be retrieved. Further, the events may be routed based on routing tables and availability of the matching nodes. Based on the routing, the events may be forwarded to the subscribers.

Abstract: Systems and methods for dispatching targeted event notifications to subscribers are disclosed. In an embodiment, the system includes a receiver to receive events from a publisher. The system further comprises a router in communication with the receiver to route the events. The system further comprises a director to forward the targeted event notifications to the subscribers based on the routing. The director receives a delivery status of the targeted event notification from the subscribers. The delivery status includes one of success in receiving the targeted event notification and failure in receiving the targeted event notification. The director receives an event notification with the delivery status as failure in receiving the targeted event notification. The director places the targeted event notification in a delayed queue indicative of events to be delivered after a predefined time. The director re-transmits the targeted event notification to the subscribers based on the delayed queue.

Abstract: Systems and methods for providing targeted event notifications to subscribers are disclosed. In an example embodiment, events may be received from a publisher. The events may be categorized into a plurality of topics. The events may be distributed among brokers to process a topic selected from the plurality of topics based on the events. Further, it may be determined whether the topic exists in a list of topics handled by the brokers. Authentication credentials of the publisher may be validated, based on the determination. Based on the validation, queues of the events may be formed based on an order of receipt of the events. The events present in the queues may be filtered based on subscriptions of the events. For the fileted events, targeted even notifications may be forwarded to the subscribers.