HTTPCLIENT-895: Log object lookups by short lived components impair performance

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@885900 13f79535-47bb-0310-9956-ffa450edef68

RELEASE_NOTES.txt

@@ -14,7 +14,10 @@ functionality improvements and new features.
 * Support for transparent content encoding. Please note transparent content 
   encoding is not enabled per default in order to avoid conflicts with
   already existing custom content encoding solutions.
-  
+
+* 5 to 10% performance increase due to elimination of unnecessary Log object 
+  lookups by short-lived components.
+
 Please note all methods and classes added in this release and marked as
 4.1 are API unstable and can change in the future 4.1 ALPHA releases.
   
@@ -69,9 +72,16 @@ This is a bug fix release that addresses a number of issues discovered since
 the previous stable release. None of the fixed bugs is considered critical. 
 Most notably this release eliminates eliminates dependency on JCIP annotations.
 
+This release is also expected to improve performance by 5 to 10% due to
+elimination of unnecessary Log object lookups by short-lived components.
+
 Changelog
 -------------------
 
+* [HTTPCLIENT-895] Eliminated Log lookups in short lived objects impairing 
+  performance.
+  Contributed by Oleg Kalnichevski <olegk at apache.org>
+
 * [HTTPCLIENT-885] URLEncodedUtils now correctly parses form-url-encoded 
   entities that specify a charset.
   Contributed by Oleg Kalnichevski <olegk at apache.org>

httpclient/src/main/java/org/apache/http/impl/client/AbstractHttpClient.java

@@ -738,6 +738,7 @@ public abstract class AbstractHttpClient implements HttpClient {
             final UserTokenHandler stateHandler,
             final HttpParams params) {
         return new DefaultRequestDirector(
+                log,
                 requestExec,
                 conman,
                 reustrat,

httpclient/src/main/java/org/apache/http/impl/client/ClientParamsStack.java

@@ -29,8 +29,6 @@ package org.apache.http.impl.client;
 
 import org.apache.http.annotation.NotThreadSafe;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.http.params.HttpParams;
 import org.apache.http.params.AbstractHttpParams;
 
@@ -73,8 +71,6 @@ import org.apache.http.params.AbstractHttpParams;
 @NotThreadSafe
 public class ClientParamsStack extends AbstractHttpParams {
 
-    private final Log log = LogFactory.getLog(getClass());
-    
     /** The application parameter collection, or <code>null</code>. */
     protected final HttpParams applicationParams;
 
@@ -211,10 +207,6 @@ public class ClientParamsStack extends AbstractHttpParams {
         if ((result == null) && (applicationParams != null)) {
             result = applicationParams.getParameter(name);
         }
-        if (this.log.isDebugEnabled() && result != null) {
-            this.log.debug("'" + name + "': " + result);
-        }
-
         return result;
     }
 

httpclient/src/main/java/org/apache/http/impl/client/DefaultRequestDirector.java

@@ -135,7 +135,7 @@ import org.apache.http.protocol.HttpRequestExecutor;
 @NotThreadSafe // e.g. managedConn
 public class DefaultRequestDirector implements RequestDirector {
 
-    private final Log log = LogFactory.getLog(getClass());
+    private final Log log;
     
     /** The connection manager. */
     protected final ClientConnectionManager connManager;
@@ -204,7 +204,8 @@ public class DefaultRequestDirector implements RequestDirector {
             final AuthenticationHandler proxyAuthHandler,
             final UserTokenHandler userTokenHandler,
             final HttpParams params) {
-        this(requestExec, conman, reustrat, kastrat, rouplan, httpProcessor, retryHandler,
+        this(LogFactory.getLog(DefaultRequestDirector.class),
+                requestExec, conman, reustrat, kastrat, rouplan, httpProcessor, retryHandler,
                 new DefaultRedirectStrategyAdaptor(redirectHandler), 
                 targetAuthHandler, proxyAuthHandler, userTokenHandler, params);
     }    
@@ -214,6 +215,7 @@ public class DefaultRequestDirector implements RequestDirector {
      * @since 4.1
      */
     public DefaultRequestDirector(
+            final Log log,
             final HttpRequestExecutor requestExec,
             final ClientConnectionManager conman,
             final ConnectionReuseStrategy reustrat,
@@ -227,6 +229,10 @@ public class DefaultRequestDirector implements RequestDirector {
             final UserTokenHandler userTokenHandler,
             final HttpParams params) {
 
+        if (log == null) {
+            throw new IllegalArgumentException
+                ("Log may not be null.");
+        }
         if (requestExec == null) {
             throw new IllegalArgumentException
                 ("Request executor may not be null.");
@@ -275,6 +281,7 @@ public class DefaultRequestDirector implements RequestDirector {
             throw new IllegalArgumentException
                 ("HTTP parameters may not be null");
         }
+        this.log               = log;
         this.requestExec       = requestExec;
         this.connManager       = conman;
         this.reuseStrategy     = reustrat;