com.hazelcast.logging.Logger Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.logging;
import com.hazelcast.nio.ClassLoaderUtil;
import com.hazelcast.util.StringUtil;
public final class Logger {
private static volatile LoggerFactory loggerFactory;
private static final Object FACTORY_LOCK = new Object();
private Logger() {
}
/**
* @param clazz class to take the logger name from
* @return the logger
* Use LoggingService instead if possible. Do not log in static context if possible.
*/
public static ILogger getLogger(Class clazz) {
return getLogger(clazz.getName());
}
/**
* @param name name of the logger
* @return the logger
* Use LoggingService instead if possible. Do not log in static context if possible.
*/
public static ILogger getLogger(String name) {
LoggerFactory loggerFactoryToUse = loggerFactory;
// fast-track when factory is initialized
if (loggerFactoryToUse != null) {
return loggerFactoryToUse.getLogger(name);
}
synchronized (FACTORY_LOCK) {
if (loggerFactory == null) {
// init static logger with user-specified custom logger class
String loggerClass = System.getProperty("hazelcast.logging.class");
if (!StringUtil.isNullOrEmpty(loggerClass)) {
//ok, there is a custom logging factory class -> let's use it now and store it for next time
loggerFactoryToUse = loadLoggerFactory(loggerClass);
loggerFactory = loggerFactoryToUse;
} else {
String loggerType = System.getProperty("hazelcast.logging.type");
loggerFactoryToUse = newLoggerFactory(loggerType);
//store the factory only when the type was set explicitly. we do not want to store default type.
if (!StringUtil.isNullOrEmpty(loggerType)) {
loggerFactory = loggerFactoryToUse;
}
}
}
}
//loggerFactory was initialized by other thread before we acquired the lock->loggerFactoryToUse was left to null
if (loggerFactoryToUse == null) {
loggerFactoryToUse = loggerFactory;
}
return loggerFactoryToUse.getLogger(name);
}
public static ILogger noLogger() {
return new NoLogFactory.NoLogger();
}
@SuppressWarnings("checkstyle:npathcomplexity")
public static LoggerFactory newLoggerFactory(String loggerType) {
LoggerFactory loggerFactory = null;
String loggerClass = System.getProperty("hazelcast.logging.class");
if (loggerClass != null) {
loggerFactory = loadLoggerFactory(loggerClass);
}
if (loggerFactory == null) {
if (loggerType != null) {
if ("log4j".equals(loggerType)) {
loggerFactory = loadLoggerFactory("com.hazelcast.logging.Log4jFactory");
} else if ("log4j2".equals(loggerType)) {
loggerFactory = loadLoggerFactory("com.hazelcast.logging.Log4j2Factory");
} else if ("slf4j".equals(loggerType)) {
loggerFactory = loadLoggerFactory("com.hazelcast.logging.Slf4jFactory");
} else if ("jdk".equals(loggerType)) {
loggerFactory = new StandardLoggerFactory();
} else if ("none".equals(loggerType)) {
loggerFactory = new NoLogFactory();
}
}
}
if (loggerFactory == null) {
loggerFactory = new StandardLoggerFactory();
}
// init static field as early as possible
if (Logger.loggerFactory == null) {
//noinspection SynchronizationOnStaticField
synchronized (FACTORY_LOCK) {
if (Logger.loggerFactory == null) {
Logger.loggerFactory = loggerFactory;
}
}
}
return loggerFactory;
}
private static LoggerFactory loadLoggerFactory(String className) {
try {
return ClassLoaderUtil.newInstance(null, className);
} catch (Exception e) {
//since we don't have a logger available, lets log it to the System.err
e.printStackTrace();
return null;
}
}
}