org.jboss.netty.logging.InternalLoggerFactory Maven / Gradle / Ivy

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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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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:
 *
 *   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.jboss.netty.logging;

import org.jboss.netty.util.internal.StackTraceSimplifier;

/**
 * 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 JdkLoggerFactory}.
 * You can change it to your preferred logging framework before other Netty
 * classes are loaded:
 *  * {@link InternalLoggerFactory}.setDefaultFactory(new {@link Log4JLoggerFactory}());
 * 
 * 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.
 *
 * @apiviz.landmark
 * @apiviz.has org.jboss.netty.logging.InternalLogger oneway - - creates
 */
public abstract class InternalLoggerFactory {
    private static volatile InternalLoggerFactory defaultFactory = new JdkLoggerFactory();

    static {
        // Load the dependent classes in advance to avoid the case where
        // the VM fails to load the required classes because of too many open
        // files.
        StackTraceSimplifier.simplify(new Exception());
    }

    /**
     * Returns the default factory.  The initial default factory is
     * {@link JdkLoggerFactory}.
     */
    public static InternalLoggerFactory getDefaultFactory() {
        return defaultFactory;
    }

    /**
     * Changes the default factory.
     */
    public static void setDefaultFactory(InternalLoggerFactory defaultFactory) {
        if (defaultFactory == null) {
            throw new NullPointerException("defaultFactory");
        }
        InternalLoggerFactory.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) {
        final InternalLogger logger = getDefaultFactory().newInstance(name);
        return new InternalLogger() {

            public void debug(String msg) {
                logger.debug(msg);
            }

            public void debug(String msg, Throwable cause) {
                StackTraceSimplifier.simplify(cause);
                logger.debug(msg, cause);
            }

            public void error(String msg) {
                logger.error(msg);
            }

            public void error(String msg, Throwable cause) {
                StackTraceSimplifier.simplify(cause);
                logger.error(msg, cause);
            }

            public void info(String msg) {
                logger.info(msg);
            }

            public void info(String msg, Throwable cause) {
                StackTraceSimplifier.simplify(cause);
                logger.info(msg, cause);
            }

            public boolean isDebugEnabled() {
                return logger.isDebugEnabled();
            }

            public boolean isErrorEnabled() {
                return logger.isErrorEnabled();
            }

            public boolean isInfoEnabled() {
                return logger.isInfoEnabled();
            }

            public boolean isWarnEnabled() {
                return logger.isWarnEnabled();
            }

            public void warn(String msg) {
                logger.warn(msg);
            }

            public void warn(String msg, Throwable cause) {
                StackTraceSimplifier.simplify(cause);
                logger.warn(msg, cause);
            }

            public boolean isEnabled(InternalLogLevel level) {
                return logger.isEnabled(level);
            }

            public void log(InternalLogLevel level, String msg) {
                logger.log(level, msg);
            }

            public void log(InternalLogLevel level, String msg, Throwable cause) {
                StackTraceSimplifier.simplify(cause);
                logger.log(level, msg, cause);
            }
        };
    }

    /**
     * Creates a new logger instance with the specified name.
     */
    public abstract InternalLogger newInstance(String name);
}