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Logger.java
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Logger.java
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/*
* Copyright 2007 Yusuke Yamamoto
*
* 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 twitter4j.internal.logging;
import twitter4j.conf.Configuration;
import twitter4j.conf.ConfigurationContext;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* @author Yusuke Yamamoto - yusuke at mac.com
* @since Twitter4J 2.1.0
*/
public abstract class Logger {
private static final LoggerFactory LOGGER_FACTORY;
private static final String LOGGER_FACTORY_IMPLEMENTATION = "twitter4j.loggerFactory";
static {
LoggerFactory loggerFactory = null;
// -Dtwitter4j.debug=true -Dtwitter4j.loggerFactory=twitter4j.internal.logging.StdOutLoggerFactory
String loggerFactoryImpl = System.getProperty(LOGGER_FACTORY_IMPLEMENTATION);
if (loggerFactoryImpl != null) {
loggerFactory = getLoggerFactoryIfAvailable(loggerFactoryImpl, loggerFactoryImpl);
}
Configuration conf = ConfigurationContext.getInstance();
// configuration in twitter4j.properties
// loggerFactory=twitter4j.internal.logging.StdOutLoggerFactory
loggerFactoryImpl = conf.getLoggerFactory();
if (loggerFactoryImpl != null) {
loggerFactory = getLoggerFactoryIfAvailable(loggerFactoryImpl, loggerFactoryImpl);
}
// use SLF4J if it's found in the classpath
if (null == loggerFactory) {
loggerFactory = getLoggerFactoryIfAvailable("org.slf4j.impl.StaticLoggerBinder", "twitter4j.internal.logging.SLF4JLoggerFactory");
}
// otherwise, use commons-logging if it's found in the classpath
if (null == loggerFactory) {
loggerFactory = getLoggerFactoryIfAvailable("org.apache.commons.logging.Log", "twitter4j.internal.logging.CommonsLoggingLoggerFactory");
}
// otherwise, use log4j if it's found in the classpath
if (null == loggerFactory) {
loggerFactory = getLoggerFactoryIfAvailable("org.apache.log4j.Logger", "twitter4j.internal.logging.Log4JLoggerFactory");
}
// on Google App Engine, use java.util.logging
if (null == loggerFactory) {
loggerFactory = getLoggerFactoryIfAvailable("com.google.appengine.api.urlfetch.URLFetchService", "twitter4j.internal.logging.JULLoggerFactory");
}
// otherwise, use the default logger
if (null == loggerFactory) {
loggerFactory = new StdOutLoggerFactory();
}
LOGGER_FACTORY = loggerFactory;
try {
Method method = conf.getClass().getMethod("dumpConfiguration", new Class[]{});
method.setAccessible(true);
method.invoke(conf);
} catch (IllegalAccessException ignore) {
} catch (InvocationTargetException ignore) {
} catch (NoSuchMethodException ignore) {
}
}
private static LoggerFactory getLoggerFactoryIfAvailable(String checkClassName, String implementationClass) {
try {
Class.forName(checkClassName);
return (LoggerFactory) Class.forName(implementationClass).newInstance();
} catch (ClassNotFoundException ignore) {
} catch (InstantiationException e) {
throw new AssertionError(e);
} catch (SecurityException ignore) {
// Unsigned applets are not allowed to access System properties
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
return null;
}
/**
* Returns a Logger instance associated with the specified class.
*
* @param clazz class
* @return logger instance
*/
public static Logger getLogger(Class clazz) {
return LOGGER_FACTORY.getLogger(clazz);
}
/**
* tests if debug level logging is enabled
*
* @return if debug level logging is enabled
*/
public abstract boolean isDebugEnabled();
/**
* tests if info level logging is enabled
*
* @return if info level logging is enabled
*/
public abstract boolean isInfoEnabled();
/**
* tests if warn level logging is enabled
*
* @return if warn level logging is enabled
*/
public abstract boolean isWarnEnabled();
/**
* tests if error level logging is enabled
*
* @return if error level logging is enabled
*/
public abstract boolean isErrorEnabled();
/**
* @param message message
*/
public abstract void debug(String message);
/**
* @param message message
* @param message2 message2
*/
public abstract void debug(String message, String message2);
/**
* @param message message
*/
public abstract void info(String message);
/**
* @param message message
* @param message2 message2
*/
public abstract void info(String message, String message2);
/**
* @param message message
*/
public abstract void warn(String message);
/**
* @param message message
* @param message2 message2
*/
public abstract void warn(String message, String message2);
/**
* @param message message
*/
public abstract void error(String message);
/**
* @param message message
* @param th throwable
*/
public abstract void error(String message, Throwable th);
}