source: josm/trunk/src/org/openstreetmap/josm/io/MultiFetchServerObjectReader.java @ 11809

Last change on this file since 11809 was 11809, checked in by Don-vip, 7 months ago

findbugs - BC_UNCONFIRMED_CAST

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1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.io;
3
4import static org.openstreetmap.josm.tools.I18n.tr;
5import static org.openstreetmap.josm.tools.I18n.trn;
6
7import java.io.IOException;
8import java.io.InputStream;
9import java.net.HttpURLConnection;
10import java.util.ArrayList;
11import java.util.Collection;
12import java.util.Collections;
13import java.util.HashSet;
14import java.util.Iterator;
15import java.util.LinkedHashSet;
16import java.util.List;
17import java.util.Set;
18import java.util.concurrent.Callable;
19import java.util.concurrent.CompletionService;
20import java.util.concurrent.ExecutionException;
21import java.util.concurrent.ExecutorCompletionService;
22import java.util.concurrent.ExecutorService;
23import java.util.concurrent.Executors;
24import java.util.concurrent.Future;
25
26import org.openstreetmap.josm.Main;
27import org.openstreetmap.josm.data.osm.DataSet;
28import org.openstreetmap.josm.data.osm.DataSetMerger;
29import org.openstreetmap.josm.data.osm.Node;
30import org.openstreetmap.josm.data.osm.OsmPrimitive;
31import org.openstreetmap.josm.data.osm.OsmPrimitiveType;
32import org.openstreetmap.josm.data.osm.PrimitiveId;
33import org.openstreetmap.josm.data.osm.Relation;
34import org.openstreetmap.josm.data.osm.RelationMember;
35import org.openstreetmap.josm.data.osm.SimplePrimitiveId;
36import org.openstreetmap.josm.data.osm.Way;
37import org.openstreetmap.josm.gui.preferences.server.OverpassServerPreference;
38import org.openstreetmap.josm.gui.progress.NullProgressMonitor;
39import org.openstreetmap.josm.gui.progress.ProgressMonitor;
40import org.openstreetmap.josm.tools.Utils;
41
42/**
43 * Retrieves a set of {@link OsmPrimitive}s from an OSM server using the so called
44 * Multi Fetch API.
45 *
46 * Usage:
47 * <pre>
48 *    MultiFetchServerObjectReader reader = MultiFetchServerObjectReader()
49 *         .append(2345,2334,4444)
50 *         .append(new Node(72343));
51 *    reader.parseOsm();
52 *    if (!reader.getMissingPrimitives().isEmpty()) {
53 *        Main.info("There are missing primitives: " + reader.getMissingPrimitives());
54 *    }
55 *    if (!reader.getSkippedWays().isEmpty()) {
56 *       Main.info("There are skipped ways: " + reader.getMissingPrimitives());
57 *    }
58 * </pre>
59 */
60public class MultiFetchServerObjectReader extends OsmServerReader {
61    /**
62     * the max. number of primitives retrieved in one step. Assuming IDs with 7 digits,
63     * this leads to a max. request URL of ~ 1600 Bytes ((7 digits +  1 Separator) * 200),
64     * which should be safe according to the
65     * <a href="http://www.boutell.com/newfaq/misc/urllength.html">WWW FAQ</a>.
66     */
67    private static final int MAX_IDS_PER_REQUEST = 200;
68
69    private final Set<Long> nodes;
70    private final Set<Long> ways;
71    private final Set<Long> relations;
72    private Set<PrimitiveId> missingPrimitives;
73    private final DataSet outputDataSet;
74
75    /**
76     * Constructs a {@code MultiFetchServerObjectReader}.
77     */
78    protected MultiFetchServerObjectReader() {
79        nodes = new LinkedHashSet<>();
80        ways = new LinkedHashSet<>();
81        relations = new LinkedHashSet<>();
82        this.outputDataSet = new DataSet();
83        this.missingPrimitives = new LinkedHashSet<>();
84    }
85
86    /**
87     * Creates a new instance of {@link MultiFetchServerObjectReader} or {@link MultiFetchOverpassObjectReader}
88     * depending on the {@link OverpassServerPreference#useForMultiFetch preference}.
89     *
90     * @return a new instance
91     * @since 9241
92     */
93    public static MultiFetchServerObjectReader create() {
94        return create(OverpassServerPreference.useForMultiFetch());
95    }
96
97    /**
98     * Creates a new instance of {@link MultiFetchServerObjectReader} or {@link MultiFetchOverpassObjectReader}
99     * depending on the {@code fromMirror} parameter.
100     *
101     * @param fromMirror {@code false} for {@link MultiFetchServerObjectReader}, {@code true} for {@link MultiFetchOverpassObjectReader}
102     * @return a new instance
103     * @since 9241
104     */
105    static MultiFetchServerObjectReader create(final boolean fromMirror) {
106        if (fromMirror) {
107            return new MultiFetchOverpassObjectReader();
108        } else {
109            return new MultiFetchServerObjectReader();
110        }
111    }
112
113    /**
114     * Remembers an {@link OsmPrimitive}'s id. The id will
115     * later be fetched as part of a Multi Get request.
116     *
117     * Ignore the id if it represents a new primitives.
118     *
119     * @param id  the id
120     */
121    protected void remember(PrimitiveId id) {
122        if (id.isNew()) return;
123        switch(id.getType()) {
124        case NODE: nodes.add(id.getUniqueId()); break;
125        case WAY: ways.add(id.getUniqueId()); break;
126        case RELATION: relations.add(id.getUniqueId()); break;
127        default: throw new AssertionError();
128        }
129    }
130
131    /**
132     * appends a {@link OsmPrimitive} id to the list of ids which will be fetched from the server.
133     *
134     * @param ds the {@link DataSet} to which the primitive belongs
135     * @param id the primitive id
136     * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
137     * {@link OsmPrimitiveType#RELATION RELATION}
138     * @return this
139     */
140    public MultiFetchServerObjectReader append(DataSet ds, long id, OsmPrimitiveType type) {
141        OsmPrimitive p = ds.getPrimitiveById(id, type);
142        switch(type) {
143        case NODE:
144            return appendNode((Node) p);
145        case WAY:
146            return appendWay((Way) p);
147        case RELATION:
148            return appendRelation((Relation) p);
149        default:
150            return this;
151        }
152    }
153
154    /**
155     * appends a {@link Node} id to the list of ids which will be fetched from the server.
156     *
157     * @param node  the node (ignored, if null)
158     * @return this
159     */
160    public MultiFetchServerObjectReader appendNode(Node node) {
161        if (node == null) return this;
162        remember(node.getPrimitiveId());
163        return this;
164    }
165
166    /**
167     * appends a {@link Way} id and the list of ids of nodes the way refers to the list of ids which will be fetched from the server.
168     *
169     * @param way the way (ignored, if null)
170     * @return this
171     */
172    public MultiFetchServerObjectReader appendWay(Way way) {
173        if (way == null) return this;
174        if (way.isNew()) return this;
175        for (Node node: !recursesDown() ? way.getNodes() : Collections.<Node>emptyList()) {
176            if (!node.isNew()) {
177                remember(node.getPrimitiveId());
178            }
179        }
180        remember(way.getPrimitiveId());
181        return this;
182    }
183
184    /**
185     * appends a {@link Relation} id to the list of ids which will be fetched from the server.
186     *
187     * @param relation  the relation (ignored, if null)
188     * @return this
189     */
190    protected MultiFetchServerObjectReader appendRelation(Relation relation) {
191        if (relation == null) return this;
192        if (relation.isNew()) return this;
193        remember(relation.getPrimitiveId());
194        for (RelationMember member : !recursesDown() ? relation.getMembers() : Collections.<RelationMember>emptyList()) {
195            // avoid infinite recursion in case of cyclic dependencies in relations
196            if (OsmPrimitiveType.from(member.getMember()).equals(OsmPrimitiveType.RELATION)
197                    && relations.contains(member.getMember().getId())) {
198                continue;
199            }
200            if (!member.getMember().isIncomplete()) {
201                append(member.getMember());
202            }
203        }
204        return this;
205    }
206
207    /**
208     * appends an {@link OsmPrimitive} to the list of ids which will be fetched from the server.
209     * @param primitive the primitive
210     * @return this
211     */
212    public MultiFetchServerObjectReader append(OsmPrimitive primitive) {
213        if (primitive instanceof Node) {
214            return appendNode((Node) primitive);
215        } else if (primitive instanceof Way) {
216            return appendWay((Way) primitive);
217        } else if (primitive instanceof Relation) {
218            return appendRelation((Relation) primitive);
219        }
220        return this;
221    }
222
223    /**
224     * appends a list of {@link OsmPrimitive} to the list of ids which will be fetched from the server.
225     *
226     * @param primitives  the list of primitives (ignored, if null)
227     * @return this
228     *
229     * @see #append(OsmPrimitive)
230     */
231    public MultiFetchServerObjectReader append(Collection<? extends OsmPrimitive> primitives) {
232        if (primitives == null) return this;
233        for (OsmPrimitive primitive : primitives) {
234            append(primitive);
235        }
236        return this;
237    }
238
239    /**
240     * extracts a subset of max {@link #MAX_IDS_PER_REQUEST} ids from <code>ids</code> and
241     * replies the subset. The extracted subset is removed from <code>ids</code>.
242     *
243     * @param ids a set of ids
244     * @return the subset of ids
245     */
246    protected Set<Long> extractIdPackage(Set<Long> ids) {
247        Set<Long> pkg = new HashSet<>();
248        if (ids.isEmpty())
249            return pkg;
250        if (ids.size() > MAX_IDS_PER_REQUEST) {
251            Iterator<Long> it = ids.iterator();
252            for (int i = 0; i < MAX_IDS_PER_REQUEST; i++) {
253                pkg.add(it.next());
254            }
255            ids.removeAll(pkg);
256        } else {
257            pkg.addAll(ids);
258            ids.clear();
259        }
260        return pkg;
261    }
262
263    /**
264     * builds the Multi Get request string for a set of ids and a given {@link OsmPrimitiveType}.
265     *
266     * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
267     * {@link OsmPrimitiveType#RELATION RELATION}
268     * @param idPackage  the package of ids
269     * @return the request string
270     */
271    protected String buildRequestString(final OsmPrimitiveType type, Set<Long> idPackage) {
272        return type.getAPIName() + "s?" + type.getAPIName() + "s=" + Utils.join(",", idPackage);
273    }
274
275    protected void rememberNodesOfIncompleteWaysToLoad(DataSet from) {
276        for (Way w: from.getWays()) {
277            if (w.hasIncompleteNodes()) {
278                for (Node n: w.getNodes()) {
279                    if (n.isIncomplete()) {
280                        nodes.add(n.getId());
281                    }
282                }
283            }
284        }
285    }
286
287    /**
288     * merges the dataset <code>from</code> to {@link #outputDataSet}.
289     *
290     * @param from the other dataset
291     */
292    protected void merge(DataSet from) {
293        final DataSetMerger visitor = new DataSetMerger(outputDataSet, from);
294        visitor.merge();
295    }
296
297    /**
298     * fetches a set of ids of a given {@link OsmPrimitiveType} from the server
299     *
300     * @param ids the set of ids
301     * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
302     * {@link OsmPrimitiveType#RELATION RELATION}
303     * @param progressMonitor progress monitor
304     * @throws OsmTransferException if an error occurs while communicating with the API server
305     */
306    protected void fetchPrimitives(Set<Long> ids, OsmPrimitiveType type, ProgressMonitor progressMonitor) throws OsmTransferException {
307        String msg;
308        final String baseUrl = getBaseUrl();
309        switch (type) {
310            // CHECKSTYLE.OFF: SingleSpaceSeparator
311            case NODE:     msg = tr("Fetching a package of nodes from ''{0}''",     baseUrl); break;
312            case WAY:      msg = tr("Fetching a package of ways from ''{0}''",      baseUrl); break;
313            case RELATION: msg = tr("Fetching a package of relations from ''{0}''", baseUrl); break;
314            // CHECKSTYLE.ON: SingleSpaceSeparator
315            default: throw new AssertionError();
316        }
317        progressMonitor.setTicksCount(ids.size());
318        progressMonitor.setTicks(0);
319        // The complete set containing all primitives to fetch
320        Set<Long> toFetch = new HashSet<>(ids);
321        // Build a list of fetchers that will  download smaller sets containing only MAX_IDS_PER_REQUEST (200) primitives each.
322        // we will run up to MAX_DOWNLOAD_THREADS concurrent fetchers.
323        int threadsNumber = Main.pref.getInteger("osm.download.threads", OsmApi.MAX_DOWNLOAD_THREADS);
324        threadsNumber = Utils.clamp(threadsNumber, 1, OsmApi.MAX_DOWNLOAD_THREADS);
325        final ExecutorService exec = Executors.newFixedThreadPool(
326                threadsNumber, Utils.newThreadFactory(getClass() + "-%d", Thread.NORM_PRIORITY));
327        CompletionService<FetchResult> ecs = new ExecutorCompletionService<>(exec);
328        List<Future<FetchResult>> jobs = new ArrayList<>();
329        while (!toFetch.isEmpty()) {
330            jobs.add(ecs.submit(new Fetcher(type, extractIdPackage(toFetch), progressMonitor)));
331        }
332        // Run the fetchers
333        for (int i = 0; i < jobs.size() && !isCanceled(); i++) {
334            progressMonitor.subTask(msg + "... " + progressMonitor.getTicks() + '/' + progressMonitor.getTicksCount());
335            try {
336                FetchResult result = ecs.take().get();
337                if (result.missingPrimitives != null) {
338                    missingPrimitives.addAll(result.missingPrimitives);
339                }
340                if (result.dataSet != null && !isCanceled()) {
341                    rememberNodesOfIncompleteWaysToLoad(result.dataSet);
342                    merge(result.dataSet);
343                }
344            } catch (InterruptedException | ExecutionException e) {
345                Main.error(e);
346            }
347        }
348        exec.shutdown();
349        // Cancel requests if the user chose to
350        if (isCanceled()) {
351            for (Future<FetchResult> job : jobs) {
352                job.cancel(true);
353            }
354        }
355    }
356
357    /**
358     * invokes one or more Multi Gets to fetch the {@link OsmPrimitive}s and replies
359     * the dataset of retrieved primitives. Note that the dataset includes non visible primitives too!
360     * In contrast to a simple Get for a node, a way, or a relation, a Multi Get always replies
361     * the latest version of the primitive (if any), even if the primitive is not visible (i.e. if
362     * visible==false).
363     *
364     * Invoke {@link #getMissingPrimitives()} to get a list of primitives which have not been
365     * found on  the server (the server response code was 404)
366     *
367     * @return the parsed data
368     * @throws OsmTransferException if an error occurs while communicating with the API server
369     * @see #getMissingPrimitives()
370     *
371     */
372    @Override
373    public DataSet parseOsm(ProgressMonitor progressMonitor) throws OsmTransferException {
374        int n = nodes.size() + ways.size() + relations.size();
375        progressMonitor.beginTask(trn("Downloading {0} object from ''{1}''",
376                "Downloading {0} objects from ''{1}''", n, n, OsmApi.getOsmApi().getBaseUrl()));
377        try {
378            missingPrimitives = new HashSet<>();
379            if (isCanceled()) return null;
380            fetchPrimitives(ways, OsmPrimitiveType.WAY, progressMonitor);
381            if (isCanceled()) return null;
382            fetchPrimitives(nodes, OsmPrimitiveType.NODE, progressMonitor);
383            if (isCanceled()) return null;
384            fetchPrimitives(relations, OsmPrimitiveType.RELATION, progressMonitor);
385            if (outputDataSet != null) {
386                outputDataSet.deleteInvisible();
387            }
388            return outputDataSet;
389        } finally {
390            progressMonitor.finishTask();
391        }
392    }
393
394    /**
395     * replies the set of ids of all primitives for which a fetch request to the
396     * server was submitted but which are not available from the server (the server
397     * replied a return code of 404)
398     *
399     * @return the set of ids of missing primitives
400     */
401    public Set<PrimitiveId> getMissingPrimitives() {
402        return missingPrimitives;
403    }
404
405    /**
406     * Whether this reader fetches nodes when loading ways, or members when loading relations.
407     *
408     * @return {@code true} if the reader recurses down
409     */
410    protected boolean recursesDown() {
411        return false;
412    }
413
414    /**
415     * The class holding the results given by {@link Fetcher}.
416     * It is only a wrapper of the resulting {@link DataSet} and the collection of {@link PrimitiveId} that could not have been loaded.
417     */
418    protected static class FetchResult {
419
420        /**
421         * The resulting data set
422         */
423        public final DataSet dataSet;
424
425        /**
426         * The collection of primitive ids that could not have been loaded
427         */
428        public final Set<PrimitiveId> missingPrimitives;
429
430        /**
431         * Constructs a {@code FetchResult}
432         * @param dataSet The resulting data set
433         * @param missingPrimitives The collection of primitive ids that could not have been loaded
434         */
435        public FetchResult(DataSet dataSet, Set<PrimitiveId> missingPrimitives) {
436            this.dataSet = dataSet;
437            this.missingPrimitives = missingPrimitives;
438        }
439    }
440
441    /**
442     * The class that actually download data from OSM API.
443     * Several instances of this class are used by {@link MultiFetchServerObjectReader} (one per set of primitives to fetch).
444     * The inheritance of {@link OsmServerReader} is only explained by the need to have a distinct OSM connection by {@code Fetcher} instance.
445     * @see FetchResult
446     */
447    protected class Fetcher extends OsmServerReader implements Callable<FetchResult> {
448
449        private final Set<Long> pkg;
450        private final OsmPrimitiveType type;
451        private final ProgressMonitor progressMonitor;
452
453        /**
454         * Constructs a {@code Fetcher}
455         * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
456         * {@link OsmPrimitiveType#RELATION RELATION}
457         * @param idsPackage The set of primitives ids to fetch
458         * @param progressMonitor The progress monitor
459         */
460        public Fetcher(OsmPrimitiveType type, Set<Long> idsPackage, ProgressMonitor progressMonitor) {
461            this.pkg = idsPackage;
462            this.type = type;
463            this.progressMonitor = progressMonitor;
464        }
465
466        @Override
467        public DataSet parseOsm(ProgressMonitor progressMonitor) throws OsmTransferException {
468            // This method is implemented because of the OsmServerReader inheritance, but not used,
469            // as the main target of this class is the call() method.
470            return fetch(progressMonitor).dataSet;
471        }
472
473        @Override
474        public FetchResult call() throws Exception {
475            return fetch(progressMonitor);
476        }
477
478        /**
479         * fetches the requested primitives and updates the specified progress monitor.
480         * @param progressMonitor the progress monitor
481         * @return the {@link FetchResult} of this operation
482         * @throws OsmTransferException if an error occurs while communicating with the API server
483         */
484        protected FetchResult fetch(ProgressMonitor progressMonitor) throws OsmTransferException {
485            try {
486                return multiGetIdPackage(type, pkg, progressMonitor);
487            } catch (OsmApiException e) {
488                if (e.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
489                    Main.info(tr("Server replied with response code 404, retrying with an individual request for each object."));
490                    return singleGetIdPackage(type, pkg, progressMonitor);
491                } else {
492                    throw e;
493                }
494            }
495        }
496
497        @Override
498        protected String getBaseUrl() {
499            return MultiFetchServerObjectReader.this.getBaseUrl();
500        }
501
502        /**
503         * invokes a Multi Get for a set of ids and a given {@link OsmPrimitiveType}.
504         * The retrieved primitives are merged to {@link #outputDataSet}.
505         *
506         * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
507         * {@link OsmPrimitiveType#RELATION RELATION}
508         * @param pkg the package of ids
509         * @param progressMonitor progress monitor
510         * @return the {@link FetchResult} of this operation
511         * @throws OsmTransferException if an error occurs while communicating with the API server
512         */
513        protected FetchResult multiGetIdPackage(OsmPrimitiveType type, Set<Long> pkg, ProgressMonitor progressMonitor)
514                throws OsmTransferException {
515            String request = buildRequestString(type, pkg);
516            FetchResult result = null;
517            try (InputStream in = getInputStream(request, NullProgressMonitor.INSTANCE)) {
518                if (in == null) return null;
519                progressMonitor.subTask(tr("Downloading OSM data..."));
520                try {
521                    result = new FetchResult(OsmReader.parseDataSet(in, progressMonitor.createSubTaskMonitor(pkg.size(), false)), null);
522                } catch (IllegalDataException e) {
523                    throw new OsmTransferException(e);
524                }
525            } catch (IOException ex) {
526                Main.warn(ex);
527            }
528            return result;
529        }
530
531        /**
532         * invokes a Multi Get for a single id and a given {@link OsmPrimitiveType}.
533         * The retrieved primitive is merged to {@link #outputDataSet}.
534         *
535         * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
536         * {@link OsmPrimitiveType#RELATION RELATION}
537         * @param id the id
538         * @param progressMonitor progress monitor
539         * @return the {@link DataSet} resulting of this operation
540         * @throws OsmTransferException if an error occurs while communicating with the API server
541         */
542        protected DataSet singleGetId(OsmPrimitiveType type, long id, ProgressMonitor progressMonitor) throws OsmTransferException {
543            String request = buildRequestString(type, Collections.singleton(id));
544            DataSet result = null;
545            try (InputStream in = getInputStream(request, NullProgressMonitor.INSTANCE)) {
546                if (in == null) return null;
547                progressMonitor.subTask(tr("Downloading OSM data..."));
548                try {
549                    result = OsmReader.parseDataSet(in, progressMonitor.createSubTaskMonitor(1, false));
550                } catch (IllegalDataException e) {
551                    throw new OsmTransferException(e);
552                }
553            } catch (IOException ex) {
554                Main.warn(ex);
555            }
556            return result;
557        }
558
559        /**
560         * invokes a sequence of Multi Gets for individual ids in a set of ids and a given {@link OsmPrimitiveType}.
561         * The retrieved primitives are merged to {@link #outputDataSet}.
562         *
563         * This method is used if one of the ids in pkg doesn't exist (the server replies with return code 404).
564         * If the set is fetched with this method it is possible to find out which of the ids doesn't exist.
565         * Unfortunately, the server does not provide an error header or an error body for a 404 reply.
566         *
567         * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
568         * {@link OsmPrimitiveType#RELATION RELATION}
569         * @param pkg the set of ids
570         * @param progressMonitor progress monitor
571         * @return the {@link FetchResult} of this operation
572         * @throws OsmTransferException if an error occurs while communicating with the API server
573         */
574        protected FetchResult singleGetIdPackage(OsmPrimitiveType type, Set<Long> pkg, ProgressMonitor progressMonitor)
575                throws OsmTransferException {
576            FetchResult result = new FetchResult(new DataSet(), new HashSet<PrimitiveId>());
577            String baseUrl = OsmApi.getOsmApi().getBaseUrl();
578            for (long id : pkg) {
579                try {
580                    String msg;
581                    switch (type) {
582                        // CHECKSTYLE.OFF: SingleSpaceSeparator
583                        case NODE:     msg = tr("Fetching node with id {0} from ''{1}''",     id, baseUrl); break;
584                        case WAY:      msg = tr("Fetching way with id {0} from ''{1}''",      id, baseUrl); break;
585                        case RELATION: msg = tr("Fetching relation with id {0} from ''{1}''", id, baseUrl); break;
586                        // CHECKSTYLE.ON: SingleSpaceSeparator
587                        default: throw new AssertionError();
588                    }
589                    progressMonitor.setCustomText(msg);
590                    result.dataSet.mergeFrom(singleGetId(type, id, progressMonitor));
591                } catch (OsmApiException e) {
592                    if (e.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
593                        Main.info(tr("Server replied with response code 404 for id {0}. Skipping.", Long.toString(id)));
594                        result.missingPrimitives.add(new SimplePrimitiveId(id, type));
595                    } else {
596                        throw e;
597                    }
598                }
599            }
600            return result;
601        }
602    }
603}
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