com.github.drinkjava2.jdbpro.DbProLogger Maven / Gradle / Ivy

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/*
 * Copyright 2016 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. 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.github.drinkjava2.jdbpro;

import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * For logger output, to avoid logger jar version conflict, default use JDK log,
 * if found commons log, use it, if found Log4j use it..., by this way this
 * project has no dependency to any logger jar.
 * 
 * @author Yong Zhu
 * @since 1.7.0
 */
public interface DbProLogger {
	public void info(String msg);

	public void warn(String msg);

	public void error(String msg);

	public void debug(String msg);

	public static class DefaultDbProLogger implements DbProLogger {
		private Object commonLogger;
		private Method commonLoggerInfoMethod;
		private Method commonLoggerWarnMethod;
		private Method commonLoggerErrorMethod;
		private Logger jdkLogger;
		private static boolean firstRun = true;
		private static boolean enableLog = true;
		private static boolean exceptionfoundforinvoke=false;
		static {
			firstRun = false;
		}

		public DefaultDbProLogger(Class targetClass) {
			if (targetClass == null)
				throw new AssertionError("DbProLogger error: targetClass can not be null.");
			try {
				Class logFactoryClass = Class.forName("org.apache.commons.logging.LogFactory");
				Method method = logFactoryClass.getMethod("getLog", Class.class);
				commonLogger = method.invoke(logFactoryClass, targetClass);
				commonLoggerInfoMethod = commonLogger.getClass().getMethod("info", Object.class);
				commonLoggerWarnMethod = commonLogger.getClass().getMethod("warn", Object.class);
				commonLoggerErrorMethod = commonLogger.getClass().getMethod("error", Object.class);
				commonLoggerInfoMethod.invoke(commonLogger, " ");
			} catch (Exception e) {
				exceptionfoundforinvoke=true; 
			}

			if (exceptionfoundforinvoke) {
				if (firstRun)
					System.err.println(
							"DbProLogger failed to load org.apache.commons.logging.LogFactory. Use JDK logger.");// NOSONAR
				jdkLogger = Logger.getLogger(targetClass.getName());  
			} else if (firstRun)
				System.out.println("org.apache.commons.logging.LogFactory loaded, DbProLogger use it as logger.");// NOSONAR
		}

		/**
		 * Build a DbProLogger instance by given targetClass
		 * 
		 * @param targetClass
		 * @return A DbProLogger instance
		 */
		public static DefaultDbProLogger getLog(Class targetClass) {
			return new DefaultDbProLogger(targetClass);
		}

		public static void setEnableLog(boolean enablelog) {
			enableLog = enablelog;
		}

		public void info(String msg) {
			if (!enableLog)
				return;
			if (jdkLogger != null) {
				jdkLogger.log(Level.INFO, msg);
				return;
			}
			try {
				commonLoggerInfoMethod.invoke(commonLogger, msg);
			} catch (Exception e) {
				throw new AssertionError(e.getMessage());
			}
		}

		public void warn(String msg) {
			if (!enableLog)
				return;
			if (jdkLogger != null) {
				jdkLogger.log(Level.WARNING, msg);
				return;
			}
			try {
				commonLoggerWarnMethod.invoke(commonLogger, msg);
			} catch (Exception e) {
				throw new AssertionError(e.getMessage());
			}
		}

		public void debug(String msg) {
			if (!enableLog)
				return;
			if (jdkLogger != null) {
				jdkLogger.log(Level.FINE, msg);
				return;
			}
			try {
				commonLoggerWarnMethod.invoke(commonLogger, msg);
			} catch (Exception e) {
				throw new AssertionError(e.getMessage());
			}
		}

		public void error(String msg) {
			if (!enableLog)
				return;
			if (jdkLogger != null) {
				jdkLogger.log(Level.SEVERE, msg);
				return;
			}
			try {
				commonLoggerErrorMethod.invoke(commonLogger, msg);
			} catch (Exception e) {
				throw new AssertionError(e.getMessage());
			}
		}
	}
}