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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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 io.netty.util.internal.logging;

import io.netty.util.internal.ObjectUtil;

/**
 * Creates an {@link InternalLogger} or changes the default factory
 * implementation.  This factory allows you to choose what logging framework
 * Netty should use.  The default factory is {@link Slf4JLoggerFactory}.  If SLF4J
 * is not available, {@link Log4JLoggerFactory} is used.  If Log4J is not available,
 * {@link JdkLoggerFactory} is used.  You can change it to your preferred
 * logging framework before other Netty classes are loaded:
 * 
 * {@link InternalLoggerFactory}.setDefaultFactory({@link Log4JLoggerFactory}.INSTANCE);
 * 
* Please note that the new default factory is effective only for the classes * which were loaded after the default factory is changed. Therefore, * {@link #setDefaultFactory(InternalLoggerFactory)} should be called as early * as possible and shouldn't be called more than once. */ public abstract class InternalLoggerFactory { private static volatile InternalLoggerFactory defaultFactory; @SuppressWarnings("UnusedCatchParameter") private static InternalLoggerFactory newDefaultFactory(String name) { InternalLoggerFactory f = useSlf4JLoggerFactory(name); if (f != null) { return f; } f = useLog4J2LoggerFactory(name); if (f != null) { return f; } f = useLog4JLoggerFactory(name); if (f != null) { return f; } return useJdkLoggerFactory(name); } private static InternalLoggerFactory useSlf4JLoggerFactory(String name) { try { InternalLoggerFactory f = Slf4JLoggerFactory.getInstanceWithNopCheck(); f.newInstance(name).debug("Using SLF4J as the default logging framework"); return f; } catch (LinkageError ignore) { return null; } catch (Exception ignore) { // We catch Exception and not ReflectiveOperationException as we still support java 6 return null; } } private static InternalLoggerFactory useLog4J2LoggerFactory(String name) { try { InternalLoggerFactory f = Log4J2LoggerFactory.INSTANCE; f.newInstance(name).debug("Using Log4J2 as the default logging framework"); return f; } catch (LinkageError ignore) { return null; } catch (Exception ignore) { // We catch Exception and not ReflectiveOperationException as we still support java 6 return null; } } private static InternalLoggerFactory useLog4JLoggerFactory(String name) { try { InternalLoggerFactory f = Log4JLoggerFactory.INSTANCE; f.newInstance(name).debug("Using Log4J as the default logging framework"); return f; } catch (LinkageError ignore) { return null; } catch (Exception ignore) { // We catch Exception and not ReflectiveOperationException as we still support java 6 return null; } } private static InternalLoggerFactory useJdkLoggerFactory(String name) { InternalLoggerFactory f = JdkLoggerFactory.INSTANCE; f.newInstance(name).debug("Using java.util.logging as the default logging framework"); return f; } /** * Returns the default factory. The initial default factory is * {@link JdkLoggerFactory}. */ public static InternalLoggerFactory getDefaultFactory() { if (defaultFactory == null) { defaultFactory = newDefaultFactory(InternalLoggerFactory.class.getName()); } return defaultFactory; } /** * Changes the default factory. */ public static void setDefaultFactory(InternalLoggerFactory defaultFactory) { InternalLoggerFactory.defaultFactory = ObjectUtil.checkNotNull(defaultFactory, "defaultFactory"); } /** * Creates a new logger instance with the name of the specified class. */ public static InternalLogger getInstance(Class clazz) { return getInstance(clazz.getName()); } /** * Creates a new logger instance with the specified name. */ public static InternalLogger getInstance(String name) { return getDefaultFactory().newInstance(name); } /** * Creates a new logger instance with the specified name. */ protected abstract InternalLogger newInstance(String name); }




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