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annotate src/org/tmatesoft/hg/util/ProgressSupport.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 41a778e3fd31
children 91d75e1bac9f
rev   line source
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1 /*
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2 * Copyright (c) 2011 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.util;
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18
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19 /**
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20 * Mix-in to report progress of a long-running operation
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21 *
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22 * @author Artem Tikhomirov
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23 * @author TMate Software Ltd.
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24 */
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25 public interface ProgressSupport {
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26
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27 // -1 for unspecified?
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28 public void start(int totalUnits);
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29 public void worked(int units);
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30 // XXX have to specify whether PS implementors may expect #done regardless of job completion (i.e. in case of cancellation)
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31 public void done();
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32
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33 static class Factory {
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34
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35 /**
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36 * @param target object that might be capable to report progress. Can be <code>null</code>
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37 * @return support object extracted from target or an empty, no-op implementation
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38 */
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39 public static ProgressSupport get(Object target) {
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40 if (target instanceof ProgressSupport) {
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41 return (ProgressSupport) target;
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42 }
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43 if (target instanceof Adaptable) {
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44 ProgressSupport ps = ((Adaptable) target).getAdapter(ProgressSupport.class);
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45 if (ps != null) {
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46 return ps;
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47 }
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48 }
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49 return new ProgressSupport() {
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50 public void start(int totalUnits) {
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51 }
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52 public void worked(int units) {
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53 }
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54 public void done() {
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55 }
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56 };
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57 }
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58 }
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59
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60 class Sub implements ProgressSupport {
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61 private final ProgressSupport ps;
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62 private int total;
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63 private int units;
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64 private int psUnits;
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65
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66 public Sub(ProgressSupport parent, int parentUnits) {
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67 if (parent == null) {
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68 throw new IllegalArgumentException();
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69 }
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70 ps = parent;
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71 psUnits = parentUnits;
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72 }
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74 public void start(int totalUnits) {
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75 total = totalUnits;
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76 }
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78 public void worked(int worked) {
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79 // FIXME fine-grained subprogress report. now only report at about 50%
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80 if (psUnits > 1 && units < total/2 && units+worked > total/2) {
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81 ps.worked(psUnits/2);
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82 psUnits -= psUnits/2;
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83 }
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84 units += worked;
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85 }
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87 public void done() {
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88 ps.worked(psUnits);
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89 }
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90 }
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92 interface Target<T> {
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93 T set(ProgressSupport ps);
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94 }
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95 }