1 | /*
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2 | * Processing.java
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3 | * Copyright (C) 2008 New Zealand Digital Library, http://www.nzdl.org
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4 | *
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5 | * This program is free software; you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation; either version 2 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 | */
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19 | package org.greenstone.gsdl3.util;
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20 |
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21 | import java.io.InputStreamReader;
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22 |
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23 | import org.apache.log4j.*;
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24 |
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25 | public class Processing {
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26 |
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27 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.util.Processing.class.getName());
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28 |
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29 | /** Determine if the given process is still executing. It does this by attempting to throw an exception - not the most efficient way, but the only one as far as I know
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30 | * @param process the Process to test
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31 | * @return true if it is still executing, false otherwise
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32 | */
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33 | static public boolean processRunning(Process process) {
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34 | boolean process_running = false;
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35 |
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36 | try {
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37 | process.exitValue(); // This will throw an exception if the process hasn't ended yet.
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38 | }
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39 | catch(IllegalThreadStateException itse) {
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40 | process_running = true;
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41 | }
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42 | catch(Exception exception) {
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43 | exception.printStackTrace();
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44 | }
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45 | return process_running;
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46 | }
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47 |
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48 | static public int runProcess(String command) {
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49 |
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50 | logger.error("executing command "+command);
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51 | int exit_value = -1;
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52 | try {
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53 | Process prcs = Runtime.getRuntime().exec(command);
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54 |
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55 | InputStreamReader error_stream = new InputStreamReader( prcs.getErrorStream(), "UTF-8" );
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56 | InputStreamReader output_stream = new InputStreamReader( prcs.getInputStream(), "UTF-8" );
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57 |
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58 | StringBuffer error_buffer = new StringBuffer();
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59 | StringBuffer output_buffer = new StringBuffer();
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60 |
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61 | while(processRunning(prcs)) {
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62 | // Hopefully this doesn't block if the process is trying to write to STDOUT.
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63 | if((error_stream!=null)) {// && error_stream.ready()) {
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64 | while (error_stream.ready()) {
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65 | error_buffer.append((char)error_stream.read());
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66 | }
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67 | //error_buffer = get_stream_char(error_stream,error_buffer,bos);
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68 | }
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69 | //Hopefully this won't block if the process is trying to write to STDERR
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70 | /*else if*/ while (output_stream.ready()) {
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71 | output_buffer.append((char)output_stream.read());
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72 | //output_buffer = get_stream_char(output_stream,output_buffer,bos);
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73 | }
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74 | //else {
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75 | try {
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76 | Thread.sleep(100);
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77 | }
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78 | catch(Exception exception) {
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79 | }
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80 | // }
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81 | }
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82 |
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83 | // Of course, just because the process is finished doesn't
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84 | // mean the incoming streams are empty. Unfortunately I've
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85 | // got no chance of preserving order, so I'll process the
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86 | // error stream first, then the out stream
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87 | while(error_stream.ready()) {
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88 | error_buffer.append((char)error_stream.read());
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89 | //error_buffer = get_stream_char(error_stream,error_buffer,bos);
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90 | }
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91 |
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92 | while(output_stream.ready()) {
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93 | output_buffer.append((char)output_stream.read());
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94 | //output_buffer = get_stream_char(output_stream,output_buffer,bos);
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95 | }
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96 |
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97 | // do something with the messages
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98 | logger.error("err>"+error_buffer.toString());
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99 | logger.error("out>"+output_buffer.toString());
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100 | // Ensure that any messages still remaining in the string buffers are fired off.
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101 | // Now display final message based on exit value
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102 |
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103 | prcs.waitFor();
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104 | error_stream.close();
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105 | output_stream.close();
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106 | error_buffer = null;
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107 | output_buffer = null;
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108 |
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109 | exit_value = prcs.exitValue();
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110 | } catch (Exception e) {
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111 | logger.error(e);
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112 | return 1;
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113 | }
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114 | return exit_value;
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115 |
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116 |
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117 | }
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118 |
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119 |
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120 | }
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