add log api

src/main/java/com/alibaba/druid/pool/DruidDataSourceStatLogger.java

@@ -17,6 +17,8 @@ package com.alibaba.druid.pool;
 
 import java.util.Properties;
 
+import com.alibaba.druid.support.logging.Log;
+
 /**
  * @author wenshao<szujobs@hotmail.com>
  * @since 0.2.19
@@ -30,4 +32,8 @@ public interface DruidDataSourceStatLogger {
      * @since 0.2.21
      */
     void configFromProperties(Properties properties);
+    
+    void setLogger(Log logger);
+    
+    void setLoggerName(String loggerName);
 }

src/main/java/com/alibaba/druid/pool/DruidDataSourceStatLoggerAdapter.java

@@ -17,12 +17,14 @@ package com.alibaba.druid.pool;
 
 import java.util.Properties;
 
+import com.alibaba.druid.support.logging.Log;
+
 /**
  * 
  * @author wenshao<szujobs@hotmail.com>
  * @since 0.2.21
  */
-public abstract class DruidDataSourceStatLoggerAdapter implements DruidDataSourceStatLogger {
+public class DruidDataSourceStatLoggerAdapter implements DruidDataSourceStatLogger {
 
     @Override
     public void log(DruidDataSourceStatValue statValue) {
@@ -34,4 +36,14 @@ public abstract class DruidDataSourceStatLoggerAdapter implements DruidDataSourc
         
     }
 
+    @Override
+    public void setLogger(Log logger) {
+        
+    }
+
+    @Override
+    public void setLoggerName(String loggerName) {
+        
+    }
+
 }

src/main/java/com/alibaba/druid/pool/DruidDataSourceStatLoggerImpl.java

@@ -56,20 +56,30 @@ public class DruidDataSourceStatLoggerImpl extends DruidDataSourceStatLoggerAdap
         return logger;
     }
 
+    @Override
     public void setLoggerName(String loggerName) {
         logger = LogFactory.getLog(loggerName);
     }
     
+    @Override
     public void setLogger(Log logger) {
         if (logger == null) {
            throw new IllegalArgumentException("logger can not be null");
         }
         this.logger = logger;
     }
+    
+    public boolean isLogEnable() {
+        return logger.isInfoEnabled();
+    }
+    
+    public void log(String value) {
+        logger.info(value);
+    }
 
     @Override
     public void log(DruidDataSourceStatValue statValue) {
-        if (logger.isInfoEnabled()) {
+        if (isLogEnable()) {
             Map<String, Object> map = new LinkedHashMap<String, Object>();
 
             map.put("url", statValue.url);
@@ -225,7 +235,7 @@ public class DruidDataSourceStatLoggerImpl extends DruidDataSourceStatLoggerAdap
 
             String text = JSONUtils.toJSONString(map);
 
-            logger.info(text);
+            log(text);
         }
     }
 

src/main/java/com/alibaba/druid/support/logging/SLF4JImpl.java

@@ -35,10 +35,10 @@ public class SLF4JImpl implements Log {
     private int                 infoCount;
     private LocationAwareLogger log;
 
-    public SLF4JImpl(Class<?> clazz){
-        this.log = (LocationAwareLogger) LoggerFactory.getLogger(clazz);
+    public SLF4JImpl(LocationAwareLogger log){
+        this.log = log;
     }
-    
+
     public SLF4JImpl(String loggerName){
         this.log = (LocationAwareLogger) LoggerFactory.getLogger(loggerName);
     }