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POBest Practice to Use HttpClient in Multithreaded Environment
 

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    <p>For a while, I have been using HttpClient in a multithreaded environment. For every thread, when it initiates a connection, it will create a completely new HttpClient instance.</p> <p>Recently, I have discovered that, by using this approach, it can cause the user to have too many ports being opened, and most of the connections are in TIME_WAIT state.</p> <p><a href="http://www.opensubscriber.com/message/commons-httpclient-dev@jakarta.apache.org/86045.html" rel="noreferrer">http://www.opensubscriber.com/message/commons-httpclient-dev@jakarta.apache.org/86045.html</a></p> <p>Hence, instead of each thread doing :</p> <pre><code>HttpClient c = new HttpClient(); try { c.executeMethod(method); } catch(...) { } finally { method.releaseConnection(); } </code></pre> <p>We plan to have :</p> <p>[METHOD A]</p> <pre><code>// global_c is initialized once through // HttpClient global_c = new HttpClient(new MultiThreadedHttpConnectionManager()); try { global_c.executeMethod(method); } catch(...) { } finally { method.releaseConnection(); } </code></pre> <p>In a normal situation, global_c will be accessed by 50++ threads concurrently. I was wondering, will this create any performance issues? Is MultiThreadedHttpConnectionManager using a lock-free mechanism to implement its thread safe policy? </p> <p>If 10 threads are using global_c, will the other 40 threads be locked?</p> <p>Or would it be better if, in every thread, I create an instance of an HttpClient, but release the connection manager explicitly?</p> <p>[METHOD B]</p> <pre><code>MultiThreadedHttpConnectionManager connman = new MultiThreadedHttpConnectionManager(); HttpClient c = new HttpClient(connman); try { c.executeMethod(method); } catch(...) { } finally { method.releaseConnection(); connman.shutdown(); } </code></pre> <p>Will connman.shutdown() suffer performance issues?</p> <p>May I know which method (A or B) is better, for application using an 50++ threads?</p>
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