Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/wsplgen/Scheduler.java @ 5863:4897a58c8746
River artifacts: Added new copyright headers.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 28 Apr 2013 14:40:59 +0200 |
parents | 5aa05a7a34b7 |
children | af13ceeba52a |
rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.wsplgen; |
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10 |
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11 import java.util.HashMap; |
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12 import java.util.Map; |
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13 import java.util.concurrent.Future; |
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14 import java.util.concurrent.ScheduledThreadPoolExecutor; |
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15 |
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16 import org.apache.log4j.Logger; |
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17 |
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18 import org.dive4elements.artifacts.CallContext; |
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19 import org.dive4elements.river.artifacts.model.map.WSPLGENJob; |
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20 |
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21 |
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22 /** |
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23 * The Scheduler is used to retrieve new WSPLGENJob. The incoming jobs are added |
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24 * to a ScheduledThreadPoolExecutor. This thread pool has a number of worker |
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25 * threads that processes the WSPLGENJobs. The number of worker threads can be |
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26 * set using a System property <i>wsplgen.max.threads</i> ; its default value is |
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27 * 1. |
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28 * |
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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30 */ |
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31 public class Scheduler { |
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32 |
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33 private class FutureJob { |
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34 public Future future; |
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35 public WSPLGENJob job; |
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36 |
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37 public FutureJob(Future future, WSPLGENJob job) { |
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38 this.future = future; |
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39 this.job = job; |
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40 } |
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41 } |
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42 |
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43 public static final int MAX_WSPLGEN_PROCESSES = |
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44 Integer.getInteger("wsplgen.max.threads", 1); |
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45 |
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46 |
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47 protected ScheduledThreadPoolExecutor pool; |
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48 protected Map<String, FutureJob> jobs; |
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49 |
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50 |
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51 private static Scheduler INSTANCE; |
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52 |
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53 private static final Logger logger = Logger.getLogger(Scheduler.class); |
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54 |
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55 |
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56 |
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57 private Scheduler() { |
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58 jobs = new HashMap<String, FutureJob>(); |
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59 pool = new ScheduledThreadPoolExecutor(MAX_WSPLGEN_PROCESSES); |
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60 } |
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61 |
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62 |
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63 public static Scheduler getInstance() { |
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64 if (INSTANCE == null) { |
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65 logger.info("Create new WSPLGEN Scheduler..."); |
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66 |
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67 INSTANCE = new Scheduler(); |
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68 } |
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69 |
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70 return INSTANCE; |
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71 } |
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72 |
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73 |
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74 public void addJob(final WSPLGENJob job) { |
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75 synchronized (jobs) { |
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76 WSPLGENFuture f = new WSPLGENFuture(new WSPLGENCallable(this, job)); |
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77 pool.execute(f); |
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78 |
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79 jobs.put(job.getArtifact().identifier(), new FutureJob(f, job)); |
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80 |
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81 logger.info("New WSPLGEN job successfully added."); |
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82 } |
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83 } |
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84 |
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85 |
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86 /** |
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87 * Cancels a running (or queued) job. |
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88 * |
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89 * @param jobId The id of the job (which is the identifier of an Artifact). |
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90 */ |
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91 public void cancelJob(String jobId) { |
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92 logger.debug("Search job in queue: " + jobId); |
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93 |
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94 synchronized (jobs) { |
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95 FutureJob fj = jobs.get(jobId); |
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96 |
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97 if (fj != null) { |
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98 logger.info("Try to cancel job: " + jobId); |
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99 |
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100 fj.future.cancel(true); |
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101 |
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102 removeJob(jobId); |
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103 |
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104 fj.job.getCallContext().afterBackground( |
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parents:
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105 CallContext.STORE); |
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106 |
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107 logger.info("Canceled job: " + jobId); |
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108 } |
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109 } |
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110 } |
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111 |
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112 |
1970
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Improved the Scheduler to be able to cancel running WSPLGEN jobs.
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parents:
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113 protected void removeJob(String id) { |
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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114 synchronized (jobs) { |
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115 jobs.remove(id); |
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116 } |
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117 } |
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118 } |
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119 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |