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From "Kenny MacLeod (JIRA)" <j...@apache.org>
Subject [jira] Created: (HTTPCLIENT-805) Pass ClientConnectionManager to DefaultHttpClient constructor
Date Sun, 19 Oct 2008 10:24:44 GMT
Pass ClientConnectionManager to DefaultHttpClient constructor

                 Key: HTTPCLIENT-805
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-805
             Project: HttpComponents HttpClient
          Issue Type: Improvement
          Components: HttpClient, HttpConn
    Affects Versions: 4.0 Beta 1
            Reporter: Kenny MacLeod

Copied from my mailing list post, Oleg suggested I post it to JIRA for 4.1 fix.

I'm trying to find the least verbose way of configuring a
DefaultHttpClient with a ThreadSafeClientConnManager.

The example code given for this goes through a manual process of
configuring HttpParams and SchemeRegistry objects, which is more or less
copied from the DefaultHttpClient.createHttpParams() and
createClientConnectionManager() methods.

It's a bit of a chicken and egg situation - DefaultHttpClient can create
its own HttpParams and SchemeRegistry, which are themselves fine, but
only once its been constructed, and the constructor requires the
ThreadSafeClientConnManager, but that in turn requires the HttpParams
and SchemeRegistry objects.  The only way out is to manually construct
the HttpParams and SchemeRegistry, which is a waste.

It seems to me that DefaultHttpClient's constructor should take a
ClientConnectionManagerFactory instead of a ClientConnectionManager.
That way, the createClientConnectionManager() method already has the
factory reference, and doesn't have to grub around in the HttpParams
object to find it.

The code would then become:

new DefaultHttpClient(new ThreadSafeClientConnManagerFactory(), null);

where ThreadSafeClientConnManagerFactory.newInstance() just constructs
ThreadSafeClientConnManager.  There's no manual construction of
HttpParams and SchemeRegistry, you just leave it up to DefaultHttpClient.

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