| /** |
| * 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.atlas.hook; |
| |
| |
| import org.apache.log4j.Appender; |
| import org.apache.log4j.DailyRollingFileAppender; |
| import org.apache.log4j.FileAppender; |
| import org.apache.log4j.Level; |
| import org.apache.log4j.Logger; |
| import org.apache.log4j.PatternLayout; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Enumeration; |
| |
| /** |
| * A logger wrapper that can be used to write messages that failed to be sent to a log file. |
| */ |
| public class FailedMessagesLogger { |
| |
| public static final String PATTERN_SPEC_TIMESTAMP_MESSAGE_NEWLINE = "%d{ISO8601} %m%n"; |
| public static final String DATE_PATTERN = ".yyyy-MM-dd"; |
| |
| private final Logger logger = Logger.getLogger("org.apache.atlas.hook.FailedMessagesLogger"); |
| private String failedMessageFile; |
| |
| public FailedMessagesLogger(String failedMessageFile) { |
| this.failedMessageFile = failedMessageFile; |
| } |
| |
| void init() { |
| String rootLoggerDirectory = getRootLoggerDirectory(); |
| if (rootLoggerDirectory == null) { |
| return; |
| } |
| String absolutePath = new File(rootLoggerDirectory, failedMessageFile).getAbsolutePath(); |
| try { |
| DailyRollingFileAppender failedLogFilesAppender = new DailyRollingFileAppender( |
| new PatternLayout(PATTERN_SPEC_TIMESTAMP_MESSAGE_NEWLINE), absolutePath, DATE_PATTERN); |
| logger.addAppender(failedLogFilesAppender); |
| logger.setLevel(Level.ERROR); |
| logger.setAdditivity(false); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| /** |
| * Get the root logger file location under which the failed log messages will be written. |
| * |
| * Since this class is used in Hooks which run within JVMs of other components like Hive, |
| * we want to write the failed messages file under the same location as where logs from |
| * the host component are saved. This method attempts to get such a location from the |
| * root logger's appenders. It will work only if at least one of the appenders is a {@link FileAppender} |
| * |
| * @return directory under which host component's logs are stored. |
| */ |
| private String getRootLoggerDirectory() { |
| String rootLoggerDirectory = null; |
| org.apache.log4j.Logger rootLogger = org.apache.log4j.Logger.getRootLogger(); |
| |
| Enumeration allAppenders = rootLogger.getAllAppenders(); |
| if (allAppenders != null) { |
| while (allAppenders.hasMoreElements()) { |
| Appender appender = (Appender) allAppenders.nextElement(); |
| if (appender instanceof FileAppender) { |
| FileAppender fileAppender = (FileAppender) appender; |
| String rootLoggerFile = fileAppender.getFile(); |
| rootLoggerDirectory = new File(rootLoggerFile).getParent(); |
| break; |
| } |
| } |
| } |
| return rootLoggerDirectory; |
| } |
| |
| void log(String message) { |
| logger.error(message); |
| } |
| } |