Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/wsplgen/Scheduler.java @ 3265:c1f445b94d03

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Cosmetics, doc. flys-artifacts/trunk@4905 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Sun, 08 Jul 2012 18:38:04 +0000
parents 368040e5c400
children 453d2d0c4258
rev   line source
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6b9877a9f6c1 Added infrastructure to start WSPLGEN calculations - the FloodMapState already start such calculations.
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1 package de.intevation.flys.wsplgen;
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2
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3 import java.util.HashMap;
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4 import java.util.Map;
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5 import java.util.concurrent.Future;
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6 import java.util.concurrent.ScheduledThreadPoolExecutor;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import de.intevation.artifacts.CallContext;
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11
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12 import de.intevation.flys.artifacts.model.WSPLGENJob;
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13
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14
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15 /**
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16 * The Scheduler is used to retrieve new WSPLGENJob. The incoming jobs are added
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17 * to a ScheduledThreadPoolExecutor. This thread pool has a number of worker
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18 * threads that processes the WSPLGENJobs. The number of worker threads can be
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19 * set using a System property <i>wsplgen.max.threads</i> ; its default value is
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20 * 1.
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21 *
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22 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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23 */
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24 public class Scheduler {
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25
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26 private class FutureJob {
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27 public Future future;
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28 public WSPLGENJob job;
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29
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30 public FutureJob(Future future, WSPLGENJob job) {
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31 this.future = future;
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32 this.job = job;
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33 }
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34 }
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35
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36 public static final int MAX_WSPLGEN_PROCESSES =
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37 Integer.getInteger("wsplgen.max.threads", 1);
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38
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39
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40 protected ScheduledThreadPoolExecutor pool;
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41 protected Map<String, FutureJob> jobs;
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44 private static Scheduler INSTANCE;
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45
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46 private static final Logger logger = Logger.getLogger(Scheduler.class);
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47
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48
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49
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50 private Scheduler() {
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51 jobs = new HashMap<String, FutureJob>();
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52 pool = new ScheduledThreadPoolExecutor(MAX_WSPLGEN_PROCESSES);
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53 }
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54
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55
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56 public static Scheduler getInstance() {
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57 if (INSTANCE == null) {
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58 logger.info("Create new WSPLGEN Scheduler...");
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59
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60 INSTANCE = new Scheduler();
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61 }
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62
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63 return INSTANCE;
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64 }
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65
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66
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67 public void addJob(final WSPLGENJob job) {
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68 synchronized (jobs) {
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69 WSPLGENFuture f = new WSPLGENFuture(new WSPLGENCallable(this, job));
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70 pool.execute(f);
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71
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72 jobs.put(job.getArtifact().identifier(), new FutureJob(f, job));
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73
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74 logger.info("New WSPLGEN job successfully added.");
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75 }
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76 }
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77
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78
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79 /**
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80 * Cancels a running (or queued) job.
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81 *
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82 * @param jobId The id of the job (which is the identifier of an Artifact).
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83 */
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84 public void cancelJob(String jobId) {
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85 logger.debug("Search job in queue: " + jobId);
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86
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87 synchronized (jobs) {
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88 FutureJob fj = jobs.get(jobId);
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89
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90 if (fj != null) {
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91 logger.info("Try to cancel job: " + jobId);
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92
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93 fj.future.cancel(true);
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94
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95 removeJob(jobId);
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96
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97 fj.job.getCallContext().afterBackground(
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98 CallContext.STORE);
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99
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100 logger.info("Canceled job: " + jobId);
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101 }
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102 }
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103 }
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104
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105
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106 protected void removeJob(String id) {
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107 synchronized (jobs) {
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108 jobs.remove(id);
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109 }
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110 }
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111 }
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112 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org