fix log level is null in Slf4j and fix not valid in Log4j2

Author: xixingya

dubbo-common/src/main/java/org/apache/dubbo/common/logger/log4j2/Log4j2LoggerAdapter.java

@@ -21,6 +21,7 @@
 import org.apache.dubbo.common.logger.LoggerAdapter;
 
 import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.core.config.Configurator;
 
 import java.io.File;
 
@@ -30,6 +31,12 @@ public class Log4j2LoggerAdapter implements LoggerAdapter {
     private Level level;
 
     public Log4j2LoggerAdapter() {
+        try {
+            org.apache.logging.log4j.Logger logger = LogManager.getRootLogger();
+            this.level = fromLog4j2Level(logger.getLevel());
+        } catch (Exception t) {
+            // ignore
+        }
     }
 
     private static org.apache.logging.log4j.Level toLog4j2Level(Level level) {
@@ -94,6 +101,7 @@ public Level getLevel() {
     @Override
     public void setLevel(Level level) {
         this.level = level;
+        Configurator.setLevel(LogManager.getRootLogger(), toLog4j2Level(level));
     }
 
     @Override

dubbo-common/src/main/java/org/apache/dubbo/common/logger/slf4j/Slf4jLogger.java

@@ -16,6 +16,7 @@
  */
 package org.apache.dubbo.common.logger.slf4j;
 
+import org.apache.dubbo.common.logger.Level;
 import org.apache.dubbo.common.logger.Logger;
 import org.apache.dubbo.common.logger.support.FailsafeLogger;
 
@@ -198,4 +199,27 @@ public boolean isErrorEnabled() {
         return logger.isErrorEnabled();
     }
 
+    public static Level getLevel(org.slf4j.Logger logger) {
+        if (logger.isTraceEnabled()) {
+            return Level.TRACE;
+        }
+        if (logger.isDebugEnabled()) {
+            return Level.DEBUG;
+        }
+        if (logger.isInfoEnabled()) {
+            return Level.INFO;
+        }
+        if (logger.isWarnEnabled()) {
+            return Level.WARN;
+        }
+        if (logger.isErrorEnabled()) {
+            return Level.ERROR;
+        }
+        return Level.OFF;
+    }
+
+    public Level getLevel() {
+        return getLevel(logger);
+    }
+
 }

dubbo-common/src/main/java/org/apache/dubbo/common/logger/slf4j/Slf4jLoggerAdapter.java

@@ -20,6 +20,7 @@
 import org.apache.dubbo.common.logger.Logger;
 import org.apache.dubbo.common.logger.LoggerAdapter;
 import org.apache.dubbo.common.utils.ClassUtils;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 
@@ -28,6 +29,12 @@ public class Slf4jLoggerAdapter implements LoggerAdapter {
     private Level level;
     private File file;
 
+    private static final org.slf4j.Logger ROOT_LOGGER = LoggerFactory.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME);
+
+    public Slf4jLoggerAdapter() {
+        this.level = Slf4jLogger.getLevel(ROOT_LOGGER);
+    }
+
     @Override
     public Logger getLogger(String key) {
         return new Slf4jLogger(org.slf4j.LoggerFactory.getLogger(key));
@@ -45,6 +52,7 @@ public Level getLevel() {
 
     @Override
     public void setLevel(Level level) {
+        getLogger(Slf4jLoggerAdapter.class).warn(String.format("The level of slf4j logger can not be set, using the default level: %s",Slf4jLogger.getLevel(ROOT_LOGGER)));
         this.level = level;
     }