xpepper

GOTO 2017 • The Many Meanings of Event-Driven Architecture - Martin Fowler

(the video is here, the original talk notes are here)

At least one of those four patterns are in play when you talk about "event-driven" architectures:

1. Event Notification: components communicating via events
2. Event-carried State Transfer: allowing components to access data without calling the source
3. Event Sourcing: using an event log as the primary record for a system
4. CQRS: having a separate component for updating a store from any readers of the store

Default.sublime-theme

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onderaltintas

var degrees2meters = function(lon,lat) {
  var x = lon * 20037508.34 / 180;
  var y = Math.log(Math.tan((90 + lat) * Math.PI / 360)) / (Math.PI / 180);
  y = y * 20037508.34 / 180;
  return [x, y]
}
//test
lon= -77.035974
lat = 38.898717