| 1 | // Jomic - a viewer for comic book archives. |
| 2 | // Copyright (C) 2004-2008 Thomas Aglassinger |
| 3 | // |
| 4 | // This program is free software: you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation, either version 3 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // This program is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | package net.sf.jomic.tools; |
| 17 | |
| 18 | import java.util.HashMap; |
| 19 | import java.util.Map; |
| 20 | |
| 21 | import net.sf.wraplog.Logger; |
| 22 | |
| 23 | /** |
| 24 | * A task composed of sub-tasks. |
| 25 | * |
| 26 | * @author Thomas Aglassinger |
| 27 | */ |
| 28 | public class NestedTask extends AbstractTask implements ProgressChangeListener |
| 29 | { |
| 30 | private boolean afterErrorContinueWithNextTask; |
| 31 | private Logger logger; |
| 32 | private long[] subTaskStartProgresses; |
| 33 | private Map subTaskToInvocationIndexMap; |
| 34 | private Task[] subTasks; |
| 35 | |
| 36 | public NestedTask(Task[] newSubTasks) { |
| 37 | this(newSubTasks, false); |
| 38 | } |
| 39 | |
| 40 | public NestedTask(Task[] newSubTasks, boolean newAfterErrorContinueWithNextTask) { |
| 41 | this(); |
| 42 | assert newSubTasks != null; |
| 43 | int subTaskCount = newSubTasks.length; |
| 44 | long nestedMaxProgress = 0; |
| 45 | int stepCount = subTaskCount; |
| 46 | |
| 47 | subTasks = new Task[subTaskCount]; |
| 48 | afterErrorContinueWithNextTask = newAfterErrorContinueWithNextTask; |
| 49 | System.arraycopy(newSubTasks, 0, subTasks, 0, subTaskCount); |
| 50 | subTaskStartProgresses = new long[stepCount]; |
| 51 | subTaskToInvocationIndexMap = new HashMap(); |
| 52 | for (int i = 0; i < stepCount; i += 1) { |
| 53 | Task currentTask = newSubTasks[i]; |
| 54 | |
| 55 | assert currentTask != null; |
| 56 | currentTask.addProgressChangeListener(this); |
| 57 | |
| 58 | Object previousItem = subTaskToInvocationIndexMap.put(currentTask, new Integer(i)); |
| 59 | |
| 60 | assert previousItem == null; |
| 61 | subTaskStartProgresses[i] = nestedMaxProgress; |
| 62 | nestedMaxProgress += currentTask.getMaxProgress(); |
| 63 | } |
| 64 | setMaxProgress(nestedMaxProgress); |
| 65 | } |
| 66 | |
| 67 | private NestedTask() { |
| 68 | super(); |
| 69 | logger = Logger.getLogger(NestedTask.class); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Listen to progress changes in sub-tasks and update the total progress of the nested task |
| 74 | * accordingly. |
| 75 | */ |
| 76 | public void progressChanged(Task source) { |
| 77 | assert source != null; |
| 78 | |
| 79 | Integer subTaskInvocationIndexAsInteger = (Integer) subTaskToInvocationIndexMap.get(source); |
| 80 | |
| 81 | assert subTaskInvocationIndexAsInteger != null; |
| 82 | int subTaskInvocationIndex = subTaskInvocationIndexAsInteger.intValue(); |
| 83 | long subProgress = source.getProgress(); |
| 84 | |
| 85 | setProgress(subTaskStartProgresses[subTaskInvocationIndex] + subProgress); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Run the sub-tasks. |
| 90 | */ |
| 91 | public void start() |
| 92 | throws Exception { |
| 93 | for (int i = 0; !isInterrupted() && (i < subTasks.length); i += 1) { |
| 94 | Task subTask = subTasks[i]; |
| 95 | |
| 96 | if (afterErrorContinueWithNextTask) { |
| 97 | try { |
| 98 | subTask.start(); |
| 99 | } catch (Throwable error) { |
| 100 | logger.warn("ignoring error and continuing with next task", error); |
| 101 | } finally { |
| 102 | subTask.removeProgressChangeListener(this); |
| 103 | } |
| 104 | } else { |
| 105 | try { |
| 106 | subTask.start(); |
| 107 | } finally { |
| 108 | subTask.removeProgressChangeListener(this); |
| 109 | } |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | } |