annotate mupdf-source/platform/java/example/Worker.java @ 32:72c1b70d4f5c

Also apply -Werror=implicit-function-declaration
author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
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1 // Copyright (C) 2004-2022 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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23 package example;
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25 import java.awt.EventQueue;
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26 import java.util.concurrent.LinkedBlockingQueue;
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28 public class Worker implements Runnable
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29 {
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30 public static class Task implements Runnable {
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31 public void work() {} /* The 'work' method will be executed on the background thread. */
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32 public void run() {} /* The 'run' method will be executed on the UI thread if work() did not throw any exception. */
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33 public void exception(final Throwable t) {} /* The 'exception' method will be executed on the UI thread if work() throws an exception. */
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34 }
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36 protected EventQueue eventQueue;
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37 protected LinkedBlockingQueue<Task> queue;
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38 protected boolean alive;
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39 protected Thread thread;
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41 public Worker(EventQueue eventQueue) {
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42 this.eventQueue = eventQueue;
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43 queue = new LinkedBlockingQueue<Task>();
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44 thread = new Thread(this);
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45 }
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47 public void start() {
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48 alive = true;
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49 thread.start();
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50 }
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52 public void stop() {
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53 alive = false;
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54 thread.interrupt();
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55 }
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57 public void add(Task task) {
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58 try {
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59 queue.put(task);
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60 } catch (InterruptedException x) {
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61 return;
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62 }
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63 }
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64
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65 public void run() {
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66 while (alive) {
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67 final Task task;
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68 try {
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69 task = queue.take();
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70 } catch (InterruptedException x) {
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71 break;
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72 }
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73 try {
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74 task.work();
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75 eventQueue.invokeLater(task);
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76 } catch (final Throwable t) {
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77 eventQueue.invokeLater(new Runnable() {
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78 public void run() {
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79 task.exception(t);
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80 }
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81 });
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82 }
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83 }
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84 }
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85 }