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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: HttpClient instance management
Date Wed, 24 Jun 2009 14:44:33 GMT
On Wed, Jun 24, 2009 at 04:24:39PM +0200, Imre Fazekas wrote:
> Thank you for the fast reply:
>
> A lot of get,post requests go through these methods, and after having  
> defined the httpclient static sometimes i receive this warning:
> "2009.06.24. 15:23:29 org.apache.http.impl.conn.SingleClientConnManager 
> revokeConnection
> WARNING: Invalid use of SingleClientConnManager: connection still  
> allocated.
> Make sure to release the connection before allocating another one."
>
> Do you have any idea what to do?
>
>

You should be using ThreadSafeClientConnManager instead of
SingleClientConnManager. For details see the section on connection management
in the HttpClient tutorial:

http://wiki.apache.org/HttpComponents/HttpClientTutorial

Oleg 


> Regards,
>
> Imre
>
>
> On 2009.06.24., at 15:57, Oleg Kalnichevski wrote:
>
>> On Wed, Jun 24, 2009 at 03:45:51PM +0200, Imre Fazekas wrote:
>>> Dear All,
>>>
>>>
>>> i'm just wondering when the DefaultHttpClient class should be
>>> instantiated.
>>> I have a class providing basic HTTP services like sending JSON  
>>> message,
>>> sending a get and parsing the response, etc. So this class has static
>>> methods.
>>> I defined these members with these initializations:
>>> private static HttpParams                  defaultParameters;
>>> private static  SchemeRegistry              supportedSchemes;
>>> private static  ClientConnectionManager     clcm;
>>> static{
>>>        setup();
>>>        clcm = createManager();
>>>    }
>>>
>>>    private static final void setup() {
>>>        supportedSchemes = new SchemeRegistry();
>>>        SocketFactory sf = PlainSocketFactory.getSocketFactory();
>>>        supportedSchemes.register(new Scheme("http", sf, 80));
>>>
>>>        HttpParams params = new BasicHttpParams( );
>>>        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
>>>        HttpProtocolParams.setUseExpectContinue(params, false);
>>>
>>>        defaultParameters = params;
>>>
>>>        context = new BasicHttpContext( );
>>>    }
>>>
>>>    private static final ClientConnectionManager createManager() {
>>>        return new ThreadSafeClientConnManager( defaultParameters,
>>> supportedSchemes );
>>>    }
>>>
>>>
>>> May i define the HttpClient as a static field or i should define  
>>> always a
>>> new instance when a service method is called? Like this:
>>
>> You may and you should. In short one should have:
>>
>> 1 HttpClient per service / application
>> 1 HttpContext per thread / user
>> 1 HttpRequest per request execution
>>
>> Oleg
>>
>>
>>> public static Response get(String uri) {
>>>        DefaultHttpClient httpClient = getHttpClient();
>>>        HttpGet get = new HttpGet( serverURI + uri );
>>>      ...
>>> }
>>>
>>>
>>>
>>> Thank you in advance!
>>>
>>> Regards,
>>>
>>> Imre
>>>
>>>
>>>
>>>
>>>
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>>>
>>
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>>
>
> Imre Fazekas
> Connexis Kft.
> 4034 Debrecen, V?g?h?d u. 2.
> Office:  +36 52 887 500 / 8789
> Cell:      +36-70-514 8550
> Fax:      +36 52 887 505
> Email: fazekas@connexis.com
>
>
>
>

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