1 | /**
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2 | * JSThreadable.java
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3 | * Copyright (C) 2010 New Zealand Digital Library, http://expeditee.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 3 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, see <http://www.gnu.org/licenses/>.
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17 | */
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18 |
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19 | package org.expeditee.items;
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20 |
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21 | import javax.script.ScriptEngine;
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22 |
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23 | public interface JSThreadable {
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24 | public static final class JSThread {
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25 | private Thread thread;
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26 | private final String code;
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27 | private final ScriptEngine scriptEngine;
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28 | private boolean run = false;
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29 |
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30 | public JSThread(ScriptEngine scriptEngine, String code) {
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31 | this.code = code;
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32 | this.thread = null;
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33 | this.scriptEngine = scriptEngine;
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34 | }
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35 |
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36 | /**
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37 | * Stops the thread,
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38 | * but leaves it's state so it will run next time
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39 | */
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40 | public void kill() {
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41 | if(thread != null) {
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42 | thread.interrupt();
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43 | try {
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44 | thread.join();
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45 | } catch (InterruptedException e) {
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46 | e.printStackTrace();
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47 | }
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48 | thread = null;
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49 | }
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50 | }
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51 |
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52 | /**
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53 | * Starts the thread if it isn't running and should be running
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54 | */
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55 | public void resume() {
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56 | if(!this.run)
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57 | return;
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58 | if(thread != null)
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59 | return;
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60 | thread = new Thread(new Runnable() {
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61 | @Override
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62 | public void run() {
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63 | try {
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64 | scriptEngine.eval("thread = " + code + "\nthread()");
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65 | run = false;
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66 | } catch (Exception e) {
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67 | if(e instanceof InterruptedException || e.getCause() instanceof InterruptedException) {
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68 | // if the thread was interrupted exit quietly
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69 | return;
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70 | }
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71 | e.printStackTrace();
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72 | }
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73 | }
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74 | });
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75 | thread.start();
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76 | }
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77 |
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78 | public boolean shouldRun() {
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79 | return this.run;
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80 | }
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81 |
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82 | public void shouldRun(boolean run) {
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83 | this.run = run;
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84 | }
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85 |
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86 | public void stop() {
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87 | this.kill();
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88 | this.run = false;
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89 | }
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90 |
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91 | public void start() {
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92 | this.kill();
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93 | this.run = true;
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94 | this.resume();
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95 | }
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96 | }
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97 |
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98 | public JSThread addThread(String code);
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99 | }
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