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annotate src/org/tmatesoft/hg/internal/ProcessExecHelper.java @ 418:528b6780a8bd

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A bit of FIXME cleanup (mostly degraded to TODO post 1.0), comments and javadoc
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Mar 2012 21:02:20 +0100
parents 7f27122011c3
children 9c9c442b5f2e
rev   line source
413
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1 /*
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2 * Copyright (c) 2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.File;
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20 import java.io.IOException;
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21 import java.io.InputStreamReader;
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22 import java.nio.CharBuffer;
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23 import java.util.Arrays;
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24 import java.util.LinkedList;
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25 import java.util.List;
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26
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27 /**
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28 * Utility to run shell commands. Not thread-safe.
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29 * Beware of memory overcommitment issue on Linux - suprocess get allocated virtual memory of parent process size
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30 * @see http://developers.sun.com/solaris/articles/subprocess/subprocess.html
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31 *
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32 * @author Artem Tikhomirov
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33 * @author Tmate Software Ltd.
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34 */
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35 public class ProcessExecHelper {
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36 private File dir;
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37 private int exitValue;
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38 private ProcessBuilder pb;
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39
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40 public ProcessExecHelper() {
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41 }
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42
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43 protected List<String> prepareCommand(List<String> cmd) {
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44 return cmd;
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45 }
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46
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47 public CharSequence exec(String... command) throws IOException, InterruptedException {
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48 return exec(Arrays.asList(command));
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49 }
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50
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51 public CharSequence exec(List<String> command) throws IOException, InterruptedException {
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52 List<String> cmd = prepareCommand(command);
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53 if (pb == null) {
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54 pb = new ProcessBuilder(cmd).directory(dir).redirectErrorStream(true);
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55 } else {
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56 pb.command(cmd); // dir and redirect are set
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57 }
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58 Process p = pb.start();
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59 InputStreamReader stdOut = new InputStreamReader(p.getInputStream());
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60 LinkedList<CharBuffer> l = new LinkedList<CharBuffer>();
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61 int r = -1;
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62 CharBuffer b = null;
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63 do {
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64 if (b == null || b.remaining() < b.capacity() / 3) {
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65 b = CharBuffer.allocate(512);
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66 l.add(b);
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67 }
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68 r = stdOut.read(b);
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69 } while (r != -1);
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70 int total = 0;
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71 for (CharBuffer cb : l) {
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72 total += cb.position();
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73 cb.flip();
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74 }
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75 CharBuffer res = CharBuffer.allocate(total);
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76 for (CharBuffer cb : l) {
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77 res.put(cb);
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78 }
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79 res.flip();
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80 p.waitFor();
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81 exitValue = p.exitValue();
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82 return res;
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83 }
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84
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85 public int exitValue() {
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86 return exitValue;
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87 }
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88
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89 public ProcessExecHelper cwd(File wd) {
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90 dir = wd;
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91 if (pb != null) {
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92 pb.directory(dir);
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93 }
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94 return this;
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95 }
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96 }