November 2017
Beginner to intermediate
290 pages
7h 34m
English
book
Learning Apache Apex
by Ananth Gundabattula, Thomas Weise, Munagala V. Ramanath, David Yan, Kenneth Knowles
Content preview from Learning Apache Apex
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IdleTimeHandler
Sometimes, an operator is idle, which means there is no work to do because no tuples are available on the input stream for processing (or in the case of an input operator, no data is produced on the output port(s)). Some operators could make use of the idle time to do bookkeeping work, such as maintaining caches or other other background processing. Apex provides the IdleTimeHandler interface that operators may implement to use the extra CPU time in the engine managed operator thread.
- handleIdleTime: This is called whenever the engine detects that the operator isn't doing any processing. If the implementation also doesn't have any work to do, it should block the call for a short duration to prevent a busy loop, as the method ...
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