| /** |
| * 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.oozie.util; |
| |
| import org.apache.oozie.util.XLogStreamer; |
| |
| import java.util.ArrayList; |
| import java.io.Writer; |
| import java.io.IOException; |
| import java.io.BufferedReader; |
| import java.io.InputStreamReader; |
| import java.io.InputStream; |
| |
| /** |
| * Reads the input stream(log file) and applies the filters and writes it to output stream. The filtering will also |
| * consider the log messages spilling over multiline. |
| */ |
| public class XLogReader { |
| private BufferedReader logReader; |
| private Writer logWriter; |
| private boolean noFilter = false; |
| private XLogStreamer.Filter logFilter; |
| |
| public XLogReader(InputStream logFileIS, XLogStreamer.Filter filter, Writer logWriter) { |
| logReader = new BufferedReader(new InputStreamReader(logFileIS)); |
| logFilter = filter; |
| this.logWriter = logWriter; |
| } |
| |
| /** |
| * Processes the Given Log and writes the output after applying the filters. |
| * |
| * @throws IOException |
| */ |
| public void processLog() throws IOException { |
| String line = logReader.readLine(); |
| boolean patternMatched = false; |
| int lcnt = 0; |
| if (logFilter == null || !logFilter.isFilterPresent()) { |
| noFilter = true; |
| } |
| else { |
| logFilter.constructPattern(); |
| } |
| while (line != null) { |
| if (noFilter) { |
| logWriter.write(line + "\n"); |
| } |
| else { |
| ArrayList<String> logParts = logFilter.splitLogMessage(line); |
| if (logParts != null) { |
| patternMatched = logFilter.matches(logParts); |
| } |
| if (patternMatched) { |
| logWriter.write(line + "\n"); |
| } |
| } |
| lcnt++; |
| if (lcnt % 20 == 0) { |
| logWriter.flush(); |
| } |
| line = logReader.readLine(); |
| } |
| logWriter.flush(); |
| } |
| |
| public void close() throws IOException { |
| logReader.close(); |
| } |
| } |