| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.cassandra.utils.logging; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.utils.FBUtilities; |
| |
| /** |
| * Dynamically loads and instantiates an appropriate {@link LoggingSupport} implementation according to the used slf4j binding. |
| * For production use, this should always be {@link LogbackLoggingSupport}. |
| */ |
| public class LoggingSupportFactory |
| { |
| private static final Logger logger = LoggerFactory.getLogger(LoggingSupportFactory.class); |
| |
| private static volatile LoggingSupport loggingSupport; |
| |
| private LoggingSupportFactory() {} |
| |
| /** |
| * @return An appropriate {@link LoggingSupport} implementation according to the used slf4j binding. |
| */ |
| public static LoggingSupport getLoggingSupport() |
| { |
| if (loggingSupport == null) |
| { |
| // unfortunately, this is the best way to determine if logback is being used for logger |
| String loggerFactoryClass = LoggerFactory.getILoggerFactory().getClass().getName(); |
| if (loggerFactoryClass.contains("logback")) |
| { |
| loggingSupport = FBUtilities.instanceOrConstruct("org.apache.cassandra.utils.logging.LogbackLoggingSupport", "LogbackLoggingSupport"); |
| } |
| else |
| { |
| loggingSupport = new NoOpFallbackLoggingSupport(); |
| logger.warn("You are using Cassandra with an unsupported deployment. The intended logging implementation library logback is not used by slf4j. Detected slf4j logger factory: {}. " |
| + "You will not be able to dynamically manage log levels via JMX and may have performance or other issues.", loggerFactoryClass); |
| } |
| } |
| return loggingSupport; |
| } |
| } |