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Posted to httpclient-users@hc.apache.org by Oleg Kalnichevski <ol...@apache.org> on 2009/03/19 14:06:26 UTC
Re: Reuse of HTTPClient among different invocations is ok, what
about different Web Services, hosts?
On Thu, 2009-03-19 at 14:13 +0200, Dobri Kitipov wrote:
> Hi everybody,
> when we reuse HTTPClient underneath each subsequent call to
> HttpClient.executeMethod() will go to the connection manager
> (MultiThreadedHttpConnectionManager) and ask for an instance of
> HttpConnection. I have tested some use cases when a HTTPClient is reused for
> invocation of a single WS and I can verify there is socket reuse. So far so
> good.
>
> Anyway, my question is: could we expect any problems when reusing HTTPClient
> among different threads calling different WSs which are deployed at
> different hosts/servers?
HttpClient is fully thread-safe when used with a thread-safe connection
manager.
> As stated at - http://hc.apache.org/httpclient-3.x/threading.html - there is
> a test case that demonstrates how HTTPClient can be reused among different
> threads which in turn invoke different web services (WSs). My concern is
> that HTTPClient has HttpState which I am not sure could be reused/shared
> among different WSs invocations (JavaDoc says for HttpState: "A container
> for HTTP attributes that may persist from request to request, such as {@link
> Cookie cookies} and authentication {@link Credentials credentials}.")? Can
> different WS clients share one HttpClient and its HttpState among different
> threads and invoking different WSs (e.g. at differnet hosts)?
>
Yes, they can. Maintain a separate instance of HttpState per execution
thread and pass it as a parameter to the HttpClient#executeMethod
Hope this helps
Oleg
> Thank you in advance,
> Dobri
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Re: Reuse of HTTPClient among different invocations is ok, what about
different Web Services, hosts?
Posted by Dobri Kitipov <kd...@googlemail.com>.
Thank you for the fast response Oleg :)
thanks,
dobri
On Thu, Mar 19, 2009 at 3:06 PM, Oleg Kalnichevski <ol...@apache.org> wrote:
> On Thu, 2009-03-19 at 14:13 +0200, Dobri Kitipov wrote:
> > Hi everybody,
> > when we reuse HTTPClient underneath each subsequent call to
> > HttpClient.executeMethod() will go to the connection manager
> > (MultiThreadedHttpConnectionManager) and ask for an instance of
> > HttpConnection. I have tested some use cases when a HTTPClient is reused
> for
> > invocation of a single WS and I can verify there is socket reuse. So far
> so
> > good.
> >
> > Anyway, my question is: could we expect any problems when reusing
> HTTPClient
> > among different threads calling different WSs which are deployed at
> > different hosts/servers?
>
> HttpClient is fully thread-safe when used with a thread-safe connection
> manager.
>
>
> > As stated at - http://hc.apache.org/httpclient-3.x/threading.html -
> there is
> > a test case that demonstrates how HTTPClient can be reused among
> different
> > threads which in turn invoke different web services (WSs). My concern is
> > that HTTPClient has HttpState which I am not sure could be reused/shared
> > among different WSs invocations (JavaDoc says for HttpState: "A container
> > for HTTP attributes that may persist from request to request, such as
> {@link
> > Cookie cookies} and authentication {@link Credentials credentials}.")?
> Can
> > different WS clients share one HttpClient and its HttpState among
> different
> > threads and invoking different WSs (e.g. at differnet hosts)?
> >
>
> Yes, they can. Maintain a separate instance of HttpState per execution
> thread and pass it as a parameter to the HttpClient#executeMethod
>
> Hope this helps
>
> Oleg
>
>
> > Thank you in advance,
> > Dobri
>
>
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