AbstractRequestLoggingFilter allows for dedicated shouldLog check in CommonsRequestLoggingFilter

Issue: SPR-12609

spring-web/src/main/java/org/springframework/web/filter/AbstractRequestLoggingFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -211,14 +211,15 @@ public abstract class AbstractRequestLoggingFilter extends OncePerRequestFilter
 			requestToUse = new ContentCachingRequestWrapper(request);
 		}
 
-		if (isFirstRequest) {
+		boolean shouldLog = shouldLog(requestToUse);
+		if (shouldLog && isFirstRequest) {
 			beforeRequest(requestToUse, getBeforeMessage(requestToUse));
 		}
 		try {
 			filterChain.doFilter(requestToUse, response);
 		}
 		finally {
-			if (!isAsyncStarted(requestToUse)) {
+			if (shouldLog && !isAsyncStarted(requestToUse)) {
 				afterRequest(requestToUse, getAfterMessage(requestToUse));
 			}
 		}
@@ -289,6 +290,22 @@ public abstract class AbstractRequestLoggingFilter extends OncePerRequestFilter
 		return msg.toString();
 	}
 
+
+	/**
+	 * Determine whether to call the {@link #beforeRequest}/{@link #afterRequest}
+	 * methods for the current request, i.e. whether logging is currently active
+	 * (and the log message is worth building).
+	 * <p>The default implementation always returns {@code true}. Subclasses may
+	 * override this with a log level check.
+	 * @param request current HTTP request
+	 * @return {@code true} if the before/after method should get called;
+	 * {@code false} otherwise
+	 * @since 4.1.5
+	 */
+	protected boolean shouldLog(HttpServletRequest request) {
+		return true;
+	}
+
 	/**
 	 * Concrete subclasses should implement this method to write a log message
 	 * <i>before</i> the request is processed.

spring-web/src/main/java/org/springframework/web/filter/CommonsRequestLoggingFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2005 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ import javax.servlet.http.HttpServletRequest;
  * (and optionally the query string) to the Commons Log.
  *
  * @author Rob Harrop
+ * @author Juergen Hoeller
  * @since 1.2.5
  * @see #setIncludeQueryString
  * @see #setBeforeMessagePrefix
@@ -33,14 +34,17 @@ import javax.servlet.http.HttpServletRequest;
  */
 public class CommonsRequestLoggingFilter extends AbstractRequestLoggingFilter {
 
+	@Override
+	protected boolean shouldLog(HttpServletRequest request) {
+		return logger.isDebugEnabled();
+	}
+
 	/**
 	 * Writes a log message before the request is processed.
 	 */
 	@Override
 	protected void beforeRequest(HttpServletRequest request, String message) {
-		if (logger.isDebugEnabled()) {
-			logger.debug(message);
-		}
+		logger.debug(message);
 	}
 
 	/**
@@ -48,9 +52,7 @@ public class CommonsRequestLoggingFilter extends AbstractRequestLoggingFilter {
 	 */
 	@Override
 	protected void afterRequest(HttpServletRequest request, String message) {
-		if (logger.isDebugEnabled()) {
-			logger.debug(message);
-		}
+		logger.debug(message);
 	}
 
 }