add support to log elapsedTime

logback-access/src/main/java/ch/qos/logback/access/PatternLayout.java

@@ -18,6 +18,7 @@
 
 import ch.qos.logback.access.pattern.ContentLengthConverter;
 import ch.qos.logback.access.pattern.DateConverter;
+import ch.qos.logback.access.pattern.ElapsedTimeConverter;
 import ch.qos.logback.access.pattern.EnsureLineSeparation;
 import ch.qos.logback.access.pattern.FullRequestConverter;
 import ch.qos.logback.access.pattern.FullResponseConverter;
@@ -150,7 +151,8 @@ public class PatternLayout extends PatternLayoutBase<IAccessEvent> {
     defaultConverterMap.put("fullRequest", FullRequestConverter.class.getName());
     defaultConverterMap.put("fullResponse", FullResponseConverter.class.getName());
 
-
+    defaultConverterMap.put("elapsedTime", ElapsedTimeConverter.class.getName());
+
     defaultConverterMap.put("n", LineSeparatorConverter.class.getName());
 
     defaultConverterMap.put("black", BlackCompositeConverter.class.getName());

logback-access/src/main/java/ch/qos/logback/access/jetty/JettyServerAdapter.java

@@ -47,6 +47,10 @@ public int getStatusCode() {
     return response.getStatus();
   }
 
+  public long getRequestTimestamp() {
+    return request.getTimeStamp();
+  }
+
   public Map<String, String> buildResponseHeaderMap() {
     Map<String, String> responseHeaderMap = new HashMap<String, String>();
     HttpFields httpFields = response.getHttpFields();

logback-access/src/main/java/ch/qos/logback/access/pattern/ElapsedTimeConverter.java

@@ -0,0 +1,24 @@
+/**
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2013, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+package ch.qos.logback.access.pattern;
+
+import ch.qos.logback.access.spi.IAccessEvent;
+
+public class ElapsedTimeConverter extends AccessConverter {
+
+  public String convert(IAccessEvent accessEvent) {
+    return Long.toString(accessEvent.getElapsedTime());
+  }
+
+}

logback-access/src/main/java/ch/qos/logback/access/spi/AccessEvent.java

@@ -358,6 +358,13 @@ public int getStatusCode() {
     return statusCode;
   }
 
+  public long getElapsedTime() {
+    if (serverAdapter.getRequestTimestamp() < 0) {
+      return -1;
+    }
+    return timeStamp - serverAdapter.getRequestTimestamp();
+  }
+
   public String getRequestContent() {
     if (requestContent != null) {
       return requestContent;
@@ -482,6 +489,7 @@ public void prepareForDeferredProcessing() {
     getRequestURL();
     getServerName();
     getTimeStamp();
+    getElapsedTime();
 
     getStatusCode();
     getContentLength();

logback-access/src/main/java/ch/qos/logback/access/spi/IAccessEvent.java

@@ -60,6 +60,11 @@ public interface IAccessEvent extends DeferredProcessingAware {
    */
   long getTimeStamp();
 
+  /**
+   * The time elapsed between receiving the request and logging it.
+   */
+  long getElapsedTime();
+
   String getRequestURI();
 
   /**

logback-access/src/main/java/ch/qos/logback/access/spi/ServerAdapter.java

@@ -24,6 +24,7 @@
  */
 public interface ServerAdapter {
 
+  long getRequestTimestamp();
   long getContentLength();
   int getStatusCode();
   Map<String, String> buildResponseHeaderMap();

logback-access/src/main/java/ch/qos/logback/access/tomcat/TomcatServerAdapter.java

@@ -44,7 +44,10 @@ public int getStatusCode() {
     return response.getStatus();
   }
 
-
+  public long getRequestTimestamp() {
+     return -1;
+  }
+
   public Map<String, String> buildResponseHeaderMap() {
     Map<String, String> responseHeaderMap = new HashMap<String, String>();
     for (String key : response.getHeaderNames()) {

logback-access/src/test/java/ch/qos/logback/access/dummy/DummyServerAdapter.java

@@ -34,6 +34,10 @@ public long getContentLength() {
   public int getStatusCode() {
     return response.getStatus();
   }
+
+  public long getRequestTimestamp() {
+    return -1;
+  }
 
   public Map<String, String> buildResponseHeaderMap() {
     return response.headerMap;