RocketMQ-日志

RocketMQ日志

RocketMQ提供了一个日志模块，实现自定义的Appender，目的是为了将日志发送到MQ中。

可以参考文章https://blog.csdn.net/wanbf123/article/details/77988801

在RocketMQ的client模块中中，提供一个适配log4j，log4j2和logback的工程类。不妨来学习一下。

/*
 * 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.rocketmq.client.log;

import java.lang.reflect.Method;
import java.net.URL;

import org.apache.rocketmq.common.constant.LoggerName;
import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ClientLogger {
    public static final String CLIENT_LOG_ROOT = "rocketmq.client.logRoot";
    public static final String CLIENT_LOG_MAXINDEX = "rocketmq.client.logFileMaxIndex";
    public static final String CLIENT_LOG_LEVEL = "rocketmq.client.logLevel";

    private static Logger log;

    private static Class logClass = null;

    private static Logger createLogger(final String loggerName) {
        // 如果定义了rocketmq日志配置文件的路径的话  就优先使用，否则使用默认的
        String logConfigFilePath =
                System.getProperty("rocketmq.client.log.configFile",
                        System.getenv("ROCKETMQ_CLIENT_LOG_CONFIGFILE"));
        Boolean isloadconfig =
                Boolean.parseBoolean(System.getProperty("rocketmq.client.log.loadconfig", "true"));

        // 下面3个是资源文件地址
        final String log4JResourceFile =
                System.getProperty("rocketmq.client.log4j.resource.fileName", "log4j_rocketmq_client.xml");

        final String logbackResourceFile =
                System.getProperty("rocketmq.client.logback.resource.fileName", "logback_rocketmq_client.xml");

        final String log4J2ResourceFile =
                System.getProperty("rocketmq.client.log4j2.resource.fileName", "log4j2_rocketmq_client.xml");

        // 定义日志写文件地址
        String clientLogRoot = System.getProperty(CLIENT_LOG_ROOT, "${user.home}/logs/rocketmqlogs");
        System.setProperty("client.logRoot", clientLogRoot);
        // 定义日志级别
        String clientLogLevel = System.getProperty(CLIENT_LOG_LEVEL, "INFO");
        System.setProperty("client.logLevel", clientLogLevel);
        // 定义日志数
        String clientLogMaxIndex = System.getProperty(CLIENT_LOG_MAXINDEX, "10");
        System.setProperty("client.logFileMaxIndex", clientLogMaxIndex);

        if (isloadconfig) {
            try {
                // 确定具体使用哪一个日志框架
                ILoggerFactory iLoggerFactory = LoggerFactory.getILoggerFactory();
                Class classType = iLoggerFactory.getClass();
                if (classType.getName().equals("org.slf4j.impl.Log4jLoggerFactory")) {
                    Class<?> domconfigurator;
                    Object domconfiguratorobj;
                    domconfigurator = Class.forName("org.apache.log4j.xml.DOMConfigurator");
                    domconfiguratorobj = domconfigurator.newInstance();
                    if (null == logConfigFilePath) {
                        Method configure = domconfiguratorobj.getClass().getMethod("configure", URL.class);
                        URL url = ClientLogger.class.getClassLoader().getResource(log4JResourceFile);
                        configure.invoke(domconfiguratorobj, url);
                    } else {
                        Method configure = domconfiguratorobj.getClass().getMethod("configure", String.class);
                        configure.invoke(domconfiguratorobj, logConfigFilePath);
                    }

                } else if (classType.getName().equals("ch.qos.logback.classic.LoggerContext")) {
                    Class<?> joranConfigurator;
                    Class<?> context = Class.forName("ch.qos.logback.core.Context");
                    Object joranConfiguratoroObj;
                    joranConfigurator = Class.forName("ch.qos.logback.classic.joran.JoranConfigurator");
                    joranConfiguratoroObj = joranConfigurator.newInstance();
                    Method setContext = joranConfiguratoroObj.getClass().getMethod("setContext", context);
                    setContext.invoke(joranConfiguratoroObj, iLoggerFactory);
                    if (null == logConfigFilePath) {
                        URL url = ClientLogger.class.getClassLoader().getResource(logbackResourceFile);
                        Method doConfigure =
                                joranConfiguratoroObj.getClass().getMethod("doConfigure", URL.class);
                        doConfigure.invoke(joranConfiguratoroObj, url);
                    } else {
                        Method doConfigure =
                                joranConfiguratoroObj.getClass().getMethod("doConfigure", String.class);
                        doConfigure.invoke(joranConfiguratoroObj, logConfigFilePath);
                    }

                } else if (classType.getName().equals("org.apache.logging.slf4j.Log4jLoggerFactory")) {
                    Class<?> joranConfigurator = Class.forName("org.apache.logging.log4j.core.config.Configurator");
                    Method initialize = joranConfigurator.getDeclaredMethod("initialize", String.class, String.class);
                    if (null == logConfigFilePath) {
                        initialize.invoke(joranConfigurator, "log4j2", log4J2ResourceFile);
                    } else {
                        initialize.invoke(joranConfigurator, "log4j2", logConfigFilePath);
                    }
                }
                logClass = classType;
            } catch (Exception e) {
                System.err.println(e);
            }
        }
        return LoggerFactory.getLogger(LoggerName.CLIENT_LOGGER_NAME);
    }

    public static Logger getLog() {
        if (log == null) {
            log = createLogger(LoggerName.CLIENT_LOGGER_NAME);
            return log;
        } else {
            return log;
        }
    }

    public static void setLog(Logger log) {
        ClientLogger.log = log;
    }

    public static void main(String[] args) {
        /**
         * 在${user.home}/logs/rocketmqlogs中找到了日志文件
         */
        ClientLogger.getLog().info("+++++");
    }
}