优先检测slf4j

2023-03-04 19:17:16 +00:00 · 2013-07-26 16:17:44 +08:00
parent 32b1b453a8
commit 541ed5c7f2
1 changed files with 101 additions and 101 deletions
@@ -1,101 +1,101 @@
-/*
- * Copyright 1999-2011 Alibaba Group Holding Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.alibaba.druid.support.logging;
-
-import java.lang.reflect.Constructor;
-
-@SuppressWarnings("rawtypes")
-public class LogFactory {
-
-    private static Constructor logConstructor;
-
-    static {
-        // TODO add slf4j logging
-
-        // 优先选择log4j,而非Apache Common Logging. 因为后者无法设置真实Log调用者的信息
-        tryImplementation("org.apache.log4j.Logger", "com.alibaba.druid.support.logging.Log4jImpl");
-        tryImplementation("java.util.logging.Logger", "com.alibaba.druid.support.logging.Jdk14LoggingImpl");
-        tryImplementation("org.slf4j.Logger", "com.alibaba.druid.support.logging.SLF4JImpl");
-        tryImplementation("org.apache.commons.logging.LogFactory",
-                          "com.alibaba.druid.support.logging.JakartaCommonsLoggingImpl");
-
-        if (logConstructor == null) {
-            try {
-                logConstructor = NoLoggingImpl.class.getConstructor(String.class);
-            } catch (Exception e) {
-                throw new IllegalStateException(e.getMessage(), e);
-            }
-        }
-    }
-
-    @SuppressWarnings("unchecked")
-    private static void tryImplementation(String testClassName, String implClassName) {
-        if (logConstructor != null) {
-            return;
-        }
-
-        try {
-            Resources.classForName(testClassName);
-            Class implClass = Resources.classForName(implClassName);
-            logConstructor = implClass.getConstructor(new Class[] { String.class });
-
-            Class<?> declareClass = logConstructor.getDeclaringClass();
-            if (!Log.class.isAssignableFrom(declareClass)) {
-                logConstructor = null;
-            }
-
-            try {
-                logConstructor.newInstance(LogFactory.class.getName());
-            } catch (Throwable t) {
-                logConstructor = null;
-            }
-        } catch (Throwable t) {
-            // skip
-        }
-    }
-
-    public static Log getLog(Class clazz) {
-        return getLog(clazz.getName());
-    }
-
-    public static Log getLog(String loggerName) {
-        try {
-            return (Log) logConstructor.newInstance(new Object[] { loggerName });
-        } catch (Throwable t) {
-            throw new RuntimeException("Error creating logger for logger '" + loggerName + "'.  Cause: " + t, t);
-        }
-    }
-
-    @SuppressWarnings("unchecked")
-    public static synchronized void selectLog4JLogging() {
-        try {
-            Resources.classForName("org.apache.log4j.Logger");
-            Class implClass = Resources.classForName("com.alibaba.druid.support.logging.Log4jImpl");
-            logConstructor = implClass.getConstructor(new Class[] { String.class });
-        } catch (Throwable t) {
-        }
-    }
-
-    @SuppressWarnings("unchecked")
-    public static synchronized void selectJavaLogging() {
-        try {
-            Resources.classForName("java.util.logging.Logger");
-            Class implClass = Resources.classForName("com.alibaba.druid.support.logging.Jdk14LoggingImpl");
-            logConstructor = implClass.getConstructor(new Class[] { String.class });
-        } catch (Throwable t) {
-        }
-    }
-}
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.support.logging;
+
+import java.lang.reflect.Constructor;
+
+@SuppressWarnings("rawtypes")
+public class LogFactory {
+
+    private static Constructor logConstructor;
+
+    static {
+        // TODO add slf4j logging
+
+        // 优先选择log4j,而非Apache Common Logging. 因为后者无法设置真实Log调用者的信息
+    	tryImplementation("org.slf4j.Logger", "com.alibaba.druid.support.logging.SLF4JImpl");
+        tryImplementation("org.apache.log4j.Logger", "com.alibaba.druid.support.logging.Log4jImpl");
+        tryImplementation("java.util.logging.Logger", "com.alibaba.druid.support.logging.Jdk14LoggingImpl");
+        tryImplementation("org.apache.commons.logging.LogFactory",
+                          "com.alibaba.druid.support.logging.JakartaCommonsLoggingImpl");
+
+        if (logConstructor == null) {
+            try {
+                logConstructor = NoLoggingImpl.class.getConstructor(String.class);
+            } catch (Exception e) {
+                throw new IllegalStateException(e.getMessage(), e);
+            }
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private static void tryImplementation(String testClassName, String implClassName) {
+        if (logConstructor != null) {
+            return;
+        }
+
+        try {
+            Resources.classForName(testClassName);
+            Class implClass = Resources.classForName(implClassName);
+            logConstructor = implClass.getConstructor(new Class[] { String.class });
+
+            Class<?> declareClass = logConstructor.getDeclaringClass();
+            if (!Log.class.isAssignableFrom(declareClass)) {
+                logConstructor = null;
+            }
+
+            try {
+                logConstructor.newInstance(LogFactory.class.getName());
+            } catch (Throwable t) {
+                logConstructor = null;
+            }
+        } catch (Throwable t) {
+            // skip
+        }
+    }
+
+    public static Log getLog(Class clazz) {
+        return getLog(clazz.getName());
+    }
+
+    public static Log getLog(String loggerName) {
+        try {
+            return (Log) logConstructor.newInstance(new Object[] { loggerName });
+        } catch (Throwable t) {
+            throw new RuntimeException("Error creating logger for logger '" + loggerName + "'.  Cause: " + t, t);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public static synchronized void selectLog4JLogging() {
+        try {
+            Resources.classForName("org.apache.log4j.Logger");
+            Class implClass = Resources.classForName("com.alibaba.druid.support.logging.Log4jImpl");
+            logConstructor = implClass.getConstructor(new Class[] { String.class });
+        } catch (Throwable t) {
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public static synchronized void selectJavaLogging() {
+        try {
+            Resources.classForName("java.util.logging.Logger");
+            Class implClass = Resources.classForName("com.alibaba.druid.support.logging.Jdk14LoggingImpl");
+            logConstructor = implClass.getConstructor(new Class[] { String.class });
+        } catch (Throwable t) {
+        }
+    }
+}