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Aron Ahmadia commented on NUTCH-2132: ------------------------------------- I think the protection belongs in public void publish(FetcherThreadEvent event) { publisher.publish(event); } This call should only dispatch if publisher has been initialized. > Publisher/Subscriber model for Nutch to emit events > ---------------------------------------------------- > > Key: NUTCH-2132 > URL: https://issues.apache.org/jira/browse/NUTCH-2132 > Project: Nutch > Issue Type: New Feature > Components: fetcher, REST_api > Reporter: Sujen Shah > Labels: memex > Fix For: 1.12 > > Attachments: NUTCH-2132.patch, PubSub_routingkey.patch > > > It would be nice to have a Pub/Sub model in Nutch to emit certain events (ex- > Fetcher events like fetch-start, fetch-end, a fetch report which may contain > data like outlinks of the current fetched url, score, etc). > A consumer of this functionality could use this data to generate real time > visualization and generate statics of the crawl without having to wait for > the fetch round to finish. > The REST API could contain an endpoint which would respond with a url to > which a client could subscribe to get the fetcher events. -- This message was sent by Atlassian JIRA (v6.3.4#6332)