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Debezium is an open source distributed platform for change data capture. Start it up, point it at your databases, and your apps can start responding to all of the inserts, updates, and deletes that other apps commit to your databases. Debezium is durable and fast, so your apps can respond quickly and never miss an event, even when things go wrong.
database  tools  replication  eventsource 
march 2017 by smaniero
Browser APIs and Protocols: Server-Sent Events (SSE) - High Performance Browser Networking (O'Reilly)
Server-Sent Events enables efficient server-to-client streaming of text-based event data—e.g., real-time notifications or updates generated on the server. To meet this goal, SSE introduces two components: a new EventSource interface in the browser, which allows the client to receive push notifications from the server as DOM events, and the "event stream" data format, which is used to deliver the individual updates.

The combination of the EventSource API in the browser and the well-defined event stream data format is what makes SSE both an efficient and an indispensable tool for handling real-time data in the browser:

Low latency delivery via a single, long-lived connection
Efficient browser message parsing with no unbounded buffers
Automatic tracking of last seen message and auto reconnect
Client message notifications as DOM events

Under the hood, SSE provides an efficient, cross-browser implementation of XHR streaming; the actual delivery of the messages is done over a single, long-lived HTTP connection. However, unlike dealing XHR streaming on our own, the browser handles all the connection management and message parsing, allowing our applications to focus on the business logic! In short, SSE makes working with real-time data simple and efficient. Let’s take a look under the hood.
sse  http  streaming  browser  eventsource  api 
february 2017 by ianmclaury

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