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https://issues.apache.org/jira/browse/LUCENE-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546702
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Mark Miller commented on LUCENE-1026:
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Hey Mark, few more questions:
1. Why is StopWatch needed?
StopWatch could certainly be taken out. I simply used it for timing...to show
someone else that it doesn't take that long to get an accessor. I have no
problem with removing it.
2. No need to synchronize on this since you're only returning the value, not
performing any modifications to it.
Its possible this could be taken out. I doubt there would be any noticeable
trouble if you tried to read that value while another thread was updating it.
3. open() - is there a real need to throw an exception if someone called the
accessor.open() twice?
No real need I suppose. I believe this came in from the original code. I have
no objections to taking it out.
SimpleSearchServer is an attempt to give an example that shows how this code
can be used to create a very simple class that allows multi-threaded access to
a Lucene index. I whipped it out extremely quickly, but its something I would
like to build on. It can be nice to hide the IndexAccessor code behind a simple
to use class that hides Lucene and a lot of complexity.
Thanks for your work on this!
- Mark
> Provide a simple way to concurrently access a Lucene index from multiple
> threads
> --------------------------------------------------------------------------------
>
> Key: LUCENE-1026
> URL: https://issues.apache.org/jira/browse/LUCENE-1026
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index, Search
> Reporter: Mark Miller
> Priority: Minor
> Attachments: DefaultIndexAccessor.java,
> DefaultMultiIndexAccessor.java, IndexAccessor.java,
> IndexAccessorFactory.java, MultiIndexAccessor.java, shai-IndexAccessor-2.zip,
> shai-IndexAccessor.zip, shai-IndexAccessor3.zip, SimpleSearchServer.java,
> StopWatch.java, TestIndexAccessor.java
>
>
> For building interactive indexes accessed through a network/internet
> (multiple threads).
> This builds upon the LuceneIndexAccessor patch. That patch was not very
> newbie friendly and did not properly handle MultiSearchers (or at the least
> made it easy to get into trouble).
> This patch simplifies things and provides out of the box support for sharing
> the IndexAccessors across threads. There is also a simple test class and
> example SearchServer to get you started.
> Future revisions will be zipped.
> Works pretty solid as is, but could use the ability to warm new Searchers.
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