| /** |
| * 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.hadoop.contrib.failmon; |
| |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /********************************************************** |
| * Objects of this class parse the output of system command-line |
| * utilities that can give information about the state of |
| * various hardware components in the system. Typically, each such |
| * object either invokes a command and reads its output or reads the |
| * output of one such command from a file on the disk. Currently |
| * supported utilities include ifconfig, smartmontools, lm-sensors, |
| * /proc/cpuinfo. |
| * |
| **********************************************************/ |
| |
| public abstract class ShellParser implements Monitored { |
| |
| /** |
| * Find the first occurence ofa pattern in a piece of text |
| * and return a specific group. |
| * |
| * @param strPattern the regular expression to match |
| * @param text the text to search |
| * @param grp the number of the matching group to return |
| * |
| * @return a String containing the matched group of the regular expression |
| */ |
| protected String findPattern(String strPattern, String text, int grp) { |
| |
| Pattern pattern = Pattern.compile(strPattern, Pattern.MULTILINE); |
| Matcher matcher = pattern.matcher(text); |
| |
| if (matcher.find(0)) |
| return matcher.group(grp); |
| |
| return null; |
| } |
| |
| /** |
| * Finds all occurences of a pattern in a piece of text and returns |
| * the matching groups. |
| * |
| * @param strPattern the regular expression to match |
| * @param text the text to search |
| * @param grp the number of the matching group to return |
| * @param separator the string that separates occurences in the returned value |
| * |
| * @return a String that contains all occurences of strPattern in text, |
| * separated by separator |
| */ |
| protected String findAll(String strPattern, String text, int grp, |
| String separator) { |
| |
| String retval = ""; |
| boolean firstTime = true; |
| |
| Pattern pattern = Pattern.compile(strPattern); |
| Matcher matcher = pattern.matcher(text); |
| |
| while (matcher.find()) { |
| retval += (firstTime ? "" : separator) + matcher.group(grp); |
| firstTime = false; |
| } |
| |
| return retval; |
| } |
| |
| /** |
| * Insert all EventRecords that can be extracted for |
| * the represented hardware component into a LocalStore. |
| * |
| * @param ls the LocalStore into which the EventRecords |
| * are to be stored. |
| */ |
| public void monitor(LocalStore ls) { |
| ls.insert(monitor()); |
| } |
| |
| abstract public EventRecord[] monitor(); |
| |
| abstract public EventRecord query(String s) throws Exception; |
| |
| } |