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From "Jerry Cwiklik (JIRA)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-5640) UIMA-DUCC: JP/Service wrapper should not sleep when Work Item is not available
Date Wed, 08 Nov 2017 15:58:00 GMT
Jerry Cwiklik created UIMA-5640:
-----------------------------------

             Summary: UIMA-DUCC: JP/Service wrapper should not sleep when Work Item is not
available
                 Key: UIMA-5640
                 URL: https://issues.apache.org/jira/browse/UIMA-5640
             Project: UIMA
          Issue Type: Improvement
          Components: DUCC
            Reporter: Jerry Cwiklik
            Assignee: Jerry Cwiklik
             Fix For: 2.2.2-Ducc


Currently when JD/Protocol Handler runs out of work it returns null back in response to GET.
In this case, the service wrapper sleeps for a fixed amount of time and tries again. The sleeping
should be done in the client (JD/Protocol Handler) to reduce latency. Instead of waiting for
a fixed amount of time, the client code can use notification/interrupt to wake up a sleeping
GET thread when a new work items becomes available. The service wrapper will block in http
get request until a reply comes or the get request times out. On timeout, the service will
immediately call the client (JD/Protocol Handler).  



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