[jira] [Comment Edited] (NUTCH-2132) Publisher/Subscriber model for Nutch to emit events

["Chris A. Mattmann (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUTCH-2132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14943625#comment-14943625 ] 

Chris A. Mattmann edited comment on NUTCH-2132 at 10/5/15 4:42 PM:
-------------------------------------------------------------------

Right now here are a few comments:

h2. Turn these types of blocks into a function:

{code:java}
  //Publisher event
+          FetcherThreadEvent startEvent = new FetcherThreadEvent();
+          startEvent.setEventType(PublishEventType.START);
+          startEvent.setUrl(fit.getUrl().toString());
+          startEvent.setTimestamp(System.currentTimeMillis());
+          publisher.publish(startEvent);
{code}

Further, I would also just automatically set the Timestamp by setting the timeStamp in FetcherThreadEvent in the constructor. 

Also I would think about setting defaults for the ActiveMQ properties (we want this to work out of the box).


was (Author: chrismattmann):
Right now here are a few comments:

h2. Turn these types of blocks into a function:

{code:diff}
  //Publisher event
+          FetcherThreadEvent startEvent = new FetcherThreadEvent();
+          startEvent.setEventType(PublishEventType.START);
+          startEvent.setUrl(fit.getUrl().toString());
+          startEvent.setTimestamp(System.currentTimeMillis());
+          publisher.publish(startEvent);
{code}

Further, I would also just automatically set the Timestamp by setting the timeStamp in FetcherThreadEvent in the constructor. 

Also I would think about setting defaults for the ActiveMQ properties (we want this to work out of the box).

> 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: 1.11
>
>         Attachments: NUTCH-2132.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)