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https://issues.apache.org/jira/browse/HTTPCLIENT-1868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Kalnichevski resolved HTTPCLIENT-1868.
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Resolution: Fixed
Fix Version/s: 5.0 Beta1
@[~jimhorng] I just added a fully asynchronous HTTP cache storage interface and
its implementation based on memcached. Please see the commit above. I am in the
process of making the async cache exec interceptor fully asynchronous. Feel
free to watch HTTPCLIENT-1824 to monitor the progress. Once HTTPCLIENT-1824 is
resolved HttpAsyncClient should have a fully asynchronous request execution
pipeline when configured to use memcached storage backend.
Code review and help with testing would be very, very much appreciated.
Oleg
> Make memcached storage backend operation non-blocking
> -----------------------------------------------------
>
> Key: HTTPCLIENT-1868
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1868
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: HttpClient (async)
> Affects Versions: 5.0 Alpha2
> Reporter: Jim Horng
> Labels: volunteers-wanted
> Fix For: 5.0 Beta1
>
>
> < Context >
> Since `HttpAysncClient` is non-blocking, but it's operation to memcached at
> `MemcachedHttpCacheStorage` layer still using blocking I/O manner. Even
> `spymemcached` client which has non-blocking I/O in nature, but
> `MemcachedHttpCacheStorage` is using `spymemcached` blocking API.
> < Benefit >
> If all the way in flow of `HttpAsyncClient` is non-blocking, then it can
> truely do high concurrency with just a few threads, otherwise, performance
> will be largely impact by blocking calls since there's only a few threads for
> serving http requests.
> < Code Flow for Blocking manner >
> #
> `org.apache.http.impl.client.cache.memcached.MemcachedHttpCacheStorage#getEntry`
> -> `final MemcachedCacheEntry mce = reconstituteEntry(client.get(key));`
> # net.spy.memcached.MemcachedClient#get(java.lang.String)
> Should use `net.spy.memcached.MemcachedClient#asyncGet(java.lang.String)`,
> but then whole API calling structure require big changes.
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