Introspecting my wandering mind
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Part 5: Web application development using AngularJS, Spring Boot and Maven – Support for eBird APIs, HTML 5 Geolocation and Google Geocoding
In my previous post, I completed the first phase of my Bird Log application. I can use this application to view my current sightings and add new sightings. I also implemented very basic support for content filtering. In this post, I am going to use eBird APIs to display current bird sightings reported on ebird.org, near my current location. I plan to use HTML5 Geolocation APIs to find out my current location automatically and then use Google Geocoding APIs to map my current Geographic coordinates (latitude and longitude) to a human-readable address. (more…)
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Recently I had to implement a service that involved multiple nodes in a cluster to aggregate the data for certain period of time and report it back to the central server. The central server, then aggregated results provided by all the nodes in the cluster. This required all the nodes to align properly when reporting the aggregate data to the central.
For example, if the system was configured to aggregate data for 10 minutes, each node in the cluster was expected to send the aggregate data, every 10th minute beginning at the top of the hour. In this case, the central server was expecting data from all the nodes at 10:00 am, 10:10 am, 10:20 am, 10:30 am and so on. The node started at 10:05:15 am was expected to report its aggregate data at 10:10:00 am and every 10th minutes after that (instead of 10 minutes after the node is started and every 10 minutes after that).
(more…)
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