engine/compbio/engine/local/StreamGobbler.java

   1 /* Copyright (c) 2009 Peter Troshin\r
   2  *  \r
   3  *  JAva Bioinformatics Analysis Web Services (JABAWS) @version: 1.0     \r
   4  * \r
   5  *  This library is free software; you can redistribute it and/or modify it under the terms of the\r
   6  *  Apache License version 2 as published by the Apache Software Foundation\r
   7  * \r
   8  *  This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without\r
   9  *  even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Apache \r
  10  *  License for more details.\r
  11  * \r
  12  *  A copy of the license is in apache_license.txt. It is also available here:\r
  13  * @see: http://www.apache.org/licenses/LICENSE-2.0.txt\r
  14  * \r
  15  * Any republication or derived work distributed in source code form\r
  16  * must include this copyright and license notice.\r
  17  */\r
  18 package compbio.engine.local;\r
  19 \r
  20 import java.io.BufferedReader;\r
  21 import java.io.BufferedWriter;\r
  22 import java.io.Closeable;\r
  23 import java.io.IOException;\r
  24 import java.io.InputStream;\r
  25 import java.io.InputStreamReader;\r
  26 import java.io.OutputStream;\r
  27 import java.io.OutputStreamWriter;\r
  28 \r
  29 import org.apache.log4j.Logger;\r
  30 \r
  31 import compbio.util.SysPrefs;\r
  32 import compbio.util.annotation.ThreadSafe;\r
  33 \r
  34 @ThreadSafe()\r
  35 public class StreamGobbler implements Runnable {\r
  36 \r
  37         enum OutputType {\r
  38                 OUTPUT, ERROR\r
  39         };\r
  40 \r
  41         private static final Logger log = Logger.getLogger(StreamGobbler.class);\r
  42 \r
  43         final private InputStream is;\r
  44         final private OutputStream os;\r
  45         final private OutputType type;\r
  46 \r
  47         StreamGobbler(InputStream is, OutputStream os, OutputType type) {\r
  48                 this.is = is;\r
  49                 this.os = os;\r
  50                 this.type = type;\r
  51         }\r
  52 \r
  53         public void run() {\r
  54 \r
  55                 BufferedReader br = new BufferedReader(new InputStreamReader(is));\r
  56                 BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os));\r
  57                 String line = null;\r
  58                 try {\r
  59                         while ((line = br.readLine()) != null && !Thread.interrupted()) {\r
  60                                 log.trace(type + ">" + line);\r
  61                                 writer.write(line + SysPrefs.newlinechar);\r
  62                         }\r
  63                         br.close();\r
  64                         writer.close();\r
  65                 } catch (IOException ioe) {\r
  66                         log.error(ioe.getMessage(), ioe.getCause());\r
  67                 } finally {\r
  68                         closeSilently(br);\r
  69                         closeSilently(writer);\r
  70                 }\r
  71         }\r
  72 \r
  73         private static void closeSilently(Closeable stream) {\r
  74                 if (stream != null) {\r
  75                         try {\r
  76                                 stream.close();\r
  77                         } catch (IOException e) {\r
  78                                 log.error(e.getLocalizedMessage(), e.getCause());\r
  79                         }\r
  80                 }\r
  81         }\r
  82 }\r