Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/wsplgen/Scheduler.java @ 3643:171db4d5d3cb

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FixA: AT export: prevent some numerical problems with steep functions around zero. flys-artifacts/trunk@5363 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 05 Sep 2012 08:38:12 +0000
parents 453d2d0c4258
children
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 import de.intevation.flys.artifacts.model.map.WSPLGENJob;
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12
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13
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14 /**
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15 * The Scheduler is used to retrieve new WSPLGENJob. The incoming jobs are added
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16 * to a ScheduledThreadPoolExecutor. This thread pool has a number of worker
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17 * threads that processes the WSPLGENJobs. The number of worker threads can be
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18 * set using a System property <i>wsplgen.max.threads</i> ; its default value is
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19 * 1.
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20 *
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21 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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22 */
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23 public class Scheduler {
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24
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25 private class FutureJob {
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26 public Future future;
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27 public WSPLGENJob job;
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28
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29 public FutureJob(Future future, WSPLGENJob job) {
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30 this.future = future;
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31 this.job = job;
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32 }
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33 }
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34
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35 public static final int MAX_WSPLGEN_PROCESSES =
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36 Integer.getInteger("wsplgen.max.threads", 1);
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37
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38
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39 protected ScheduledThreadPoolExecutor pool;
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40 protected Map<String, FutureJob> jobs;
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43 private static Scheduler INSTANCE;
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44
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45 private static final Logger logger = Logger.getLogger(Scheduler.class);
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47
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48
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49 private Scheduler() {
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50 jobs = new HashMap<String, FutureJob>();
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51 pool = new ScheduledThreadPoolExecutor(MAX_WSPLGEN_PROCESSES);
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52 }
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53
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54
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55 public static Scheduler getInstance() {
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56 if (INSTANCE == null) {
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57 logger.info("Create new WSPLGEN Scheduler...");
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58
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59 INSTANCE = new Scheduler();
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60 }
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61
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62 return INSTANCE;
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63 }
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64
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65
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66 public void addJob(final WSPLGENJob job) {
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67 synchronized (jobs) {
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68 WSPLGENFuture f = new WSPLGENFuture(new WSPLGENCallable(this, job));
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69 pool.execute(f);
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70
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71 jobs.put(job.getArtifact().identifier(), new FutureJob(f, job));
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72
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73 logger.info("New WSPLGEN job successfully added.");
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74 }
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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 * Cancels a running (or queued) job.
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80 *
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81 * @param jobId The id of the job (which is the identifier of an Artifact).
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82 */
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83 public void cancelJob(String jobId) {
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84 logger.debug("Search job in queue: " + jobId);
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85
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86 synchronized (jobs) {
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87 FutureJob fj = jobs.get(jobId);
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88
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89 if (fj != null) {
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90 logger.info("Try to cancel job: " + jobId);
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91
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92 fj.future.cancel(true);
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93
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94 removeJob(jobId);
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95
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96 fj.job.getCallContext().afterBackground(
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97 CallContext.STORE);
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98
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99 logger.info("Canceled job: " + jobId);
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100 }
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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 protected void removeJob(String id) {
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106 synchronized (jobs) {
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107 jobs.remove(id);
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108 }
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109 }
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110 }
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111 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org