A distributed proxy cache that emulates Apple's Bonjour service to coordinate with peers.
RUN: java -jar dcache.jar {port} Example: java -jar dcache.jar 9999
This will output: "Usage: Go to {ip}:{port}/{url} in your browser." Going to http://192.168.1.7:9999/www.google.com in your browser will return www.google.com as served from the distributed web cache.
Service Discovery is done with an MDNS query that serves to both announce a cache presence and browse for other caches on the smmorneau-cache service. This is an Exponential Back-off and Service Announcement because it occurs after 1 second, 3 seconds, 9 seconds, 27 seconds, and so on, up to a maximum interval of one hour. In order to achieve Suppression of Duplicate Responses, each cache only answers for itself, replying to a cache's browse only if it has never seen that cache before.
Page Retrieval is done by first checking your local cache, and serving the content to the user on a cache hit. On a cache miss, use unicast queries to each of the peer caches to see if one has a cached version of the desired url. If a negative response is received, move on to the next peer until a positive response is received or there are no more peer caches, then perform the GET request to the web server yourself. If a positive response is received, we query the peer as if we were a normal web client, and return that response to our client.