From 414152df1310067623f10f90cfb89293926dd681 Mon Sep 17 00:00:00 2001
From: Florian Reimair <florian.reimair@iaik.tugraz.at>
Date: Tue, 10 Mar 2015 14:35:12 +0100
Subject: save some ram with logger

---
 .../java/at/gv/egovernment/moa/logging/Logger.java | 52 ++++++++++++++++------
 1 file changed, 39 insertions(+), 13 deletions(-)

(limited to 'common/src/main/java/at/gv/egovernment')

diff --git a/common/src/main/java/at/gv/egovernment/moa/logging/Logger.java b/common/src/main/java/at/gv/egovernment/moa/logging/Logger.java
index 2e76325a5..184be20cb 100644
--- a/common/src/main/java/at/gv/egovernment/moa/logging/Logger.java
+++ b/common/src/main/java/at/gv/egovernment/moa/logging/Logger.java
@@ -24,6 +24,9 @@
 
 package at.gv.egovernment.moa.logging;
 
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * A utility class acting as a facade to the logging subsystem.
  * 
@@ -45,6 +48,29 @@ public class Logger {
 	  // there is no need for that anymore
   }
 
+
+  /** The Constant instances. */
+  private static final Map<String, org.apache.log4j.Logger> instances = new HashMap<String, org.apache.log4j.Logger>();
+
+  /**
+   * Gets the logger.
+   *
+   * @return the logger
+   */
+  private static synchronized org.apache.log4j.Logger getLogger() {
+      String className = Thread.currentThread().getStackTrace()[3].getClassName();
+
+      org.apache.log4j.Logger logger = instances.get(className);
+      if (logger != null) {
+          return logger;
+      }
+
+      logger = org.apache.log4j.Logger.getLogger(className);
+      instances.put(className, logger);
+
+      return logger;
+  }
+  
   /**
    * Test, if the trace log level is enabled.
    * 
@@ -52,7 +78,7 @@ public class Logger {
    * <code>false</code> otherwise.
    */
   public static boolean isTraceEnabled() {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		return logger.isTraceEnabled();
   }
   
@@ -64,7 +90,7 @@ public class Logger {
    * <code>false</code> otherwise.
    */
   public static boolean isTraceEnabled(String hierarchy) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		return logger.isTraceEnabled();
   }
   
@@ -74,7 +100,7 @@ public class Logger {
    * @param message The message to trace.
    */
   public static void trace(Object message) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.trace(message);
   }
   
@@ -85,7 +111,7 @@ public class Logger {
    * <code>false</code> otherwise.
    */
   public static boolean isDebugEnabled() {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		return logger.isDebugEnabled();
   }
   
@@ -97,7 +123,7 @@ public class Logger {
    * <code>false</code> otherwise.
    */
   public static boolean isDebugEnabled(String hierarchy) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		return logger.isDebugEnabled();
   }
   
@@ -107,7 +133,7 @@ public class Logger {
    * @param message The message to log.
    */
   public static void debug(Object message) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.debug(message);
   }
   
@@ -117,7 +143,7 @@ public class Logger {
    * @param message The message to log.
    */
   public static void info(Object message) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.info(message);
   }
   
@@ -127,7 +153,7 @@ public class Logger {
    * @param message The message to log.
    */
   public static void warn(Object message) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.warn(message);
   }
 
@@ -138,7 +164,7 @@ public class Logger {
    * @param t An exception that may be the cause of the warning.
    */
   public static void warn(Object message, Throwable t) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.warn(message, t);
   }
   
@@ -148,7 +174,7 @@ public class Logger {
    * @param message The message to log.
    */
   public static void error(Object message) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.error(message);
   }
 
@@ -159,7 +185,7 @@ public class Logger {
    * @param t An exception that may be the cause of the error.
    */
   public static void error(Object message, Throwable t) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.error(message, t);
   }
   
@@ -169,7 +195,7 @@ public class Logger {
    * @param message The message to log.
    */
   public static void fatal(Object message) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.fatal(message);
   }
 
@@ -180,7 +206,7 @@ public class Logger {
    * @param t An exception that may be the cause of the error.
    */
   public static void fatal(Object message, Throwable t) {
-		org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(Thread.currentThread().getStackTrace()[2].getClassName());
+		org.apache.log4j.Logger logger = getLogger();
 		logger.fatal(message, t);
   }
 }
-- 
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