source: josm/trunk/src/org/openstreetmap/josm/io/MultiFetchServerObjectReader.java@ 7067

Last change on this file since 7067 was 7033, checked in by Don-vip, 10 years ago

see #8465 - global use of try-with-resources, according to
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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.HashSet;
13import java.util.Iterator;
14import java.util.LinkedHashSet;
15import java.util.List;
16import java.util.NoSuchElementException;
17import java.util.Set;
18import java.util.concurrent.Callable;
19import java.util.concurrent.CompletionService;
20import java.util.concurrent.ExecutionException;
21import java.util.concurrent.Executor;
22import java.util.concurrent.ExecutorCompletionService;
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.progress.NullProgressMonitor;
38import org.openstreetmap.josm.gui.progress.ProgressMonitor;
39import org.openstreetmap.josm.tools.CheckParameterUtil;
40
41/**
42 * Retrieves a set of {@link OsmPrimitive}s from an OSM server using the so called
43 * Multi Fetch API.
44 *
45 * Usage:
46 * <pre>
47 * MultiFetchServerObjectReader reader = MultiFetchServerObjectReader()
48 * .append(2345,2334,4444)
49 * .append(new Node(72343));
50 * reader.parseOsm();
51 * if (!reader.getMissingPrimitives().isEmpty()) {
52 * Main.info("There are missing primitives: " + reader.getMissingPrimitives());
53 * }
54 * if (!reader.getSkippedWays().isEmpty()) {
55 * Main.info("There are skipped ways: " + reader.getMissingPrimitives());
56 * }
57 * </pre>
58 */
59public class MultiFetchServerObjectReader extends OsmServerReader{
60 /**
61 * the max. number of primitives retrieved in one step. Assuming IDs with 7 digits,
62 * this leads to a max. request URL of ~ 1600 Bytes ((7 digits + 1 Separator) * 200),
63 * which should be safe according to the
64 * <a href="http://www.boutell.com/newfaq/misc/urllength.html">WWW FAQ</a>.
65 */
66 private static final int MAX_IDS_PER_REQUEST = 200;
67
68 private Set<Long> nodes;
69 private Set<Long> ways;
70 private Set<Long> relations;
71 private Set<PrimitiveId> missingPrimitives;
72 private DataSet outputDataSet;
73
74 /**
75 * Constructs a {@code MultiFetchServerObjectReader}.
76 */
77 public MultiFetchServerObjectReader() {
78 nodes = new LinkedHashSet<>();
79 ways = new LinkedHashSet<>();
80 relations = new LinkedHashSet<>();
81 this.outputDataSet = new DataSet();
82 this.missingPrimitives = new LinkedHashSet<>();
83 }
84
85 /**
86 * Remembers an {@link OsmPrimitive}'s id. The id will
87 * later be fetched as part of a Multi Get request.
88 *
89 * Ignore the id if it represents a new primitives.
90 *
91 * @param id the id
92 */
93 protected void remember(PrimitiveId id) {
94 if (id.isNew()) return;
95 switch(id.getType()) {
96 case NODE: nodes.add(id.getUniqueId()); break;
97 case WAY: ways.add(id.getUniqueId()); break;
98 case RELATION: relations.add(id.getUniqueId()); break;
99 }
100 }
101
102 /**
103 * remembers an {@link OsmPrimitive}'s id. <code>ds</code> must include
104 * an {@link OsmPrimitive} with id=<code>id</code>. The id will
105 * later we fetched as part of a Multi Get request.
106 *
107 * Ignore the id if it id &lt;= 0.
108 *
109 * @param ds the dataset (must not be null)
110 * @param id the primitive id
111 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
112 * @throws IllegalArgumentException if ds is null
113 * @throws NoSuchElementException if ds does not include an {@link OsmPrimitive} with id=<code>id</code>
114 */
115 protected void remember(DataSet ds, long id, OsmPrimitiveType type) throws IllegalArgumentException, NoSuchElementException{
116 CheckParameterUtil.ensureParameterNotNull(ds, "ds");
117 if (id <= 0) return;
118 OsmPrimitive primitive = ds.getPrimitiveById(id, type);
119 if (primitive == null)
120 throw new NoSuchElementException(tr("No primitive with id {0} in local dataset. Cannot infer primitive type.", id));
121 remember(primitive.getPrimitiveId());
122 return;
123 }
124
125 /**
126 * appends a {@link OsmPrimitive} id to the list of ids which will be fetched from the server.
127 *
128 * @param ds the {@link DataSet} to which the primitive belongs
129 * @param id the primitive id
130 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
131 * @return this
132 */
133 public MultiFetchServerObjectReader append(DataSet ds, long id, OsmPrimitiveType type) {
134 OsmPrimitive p = ds.getPrimitiveById(id,type);
135 switch(type) {
136 case NODE:
137 return appendNode((Node)p);
138 case WAY:
139 return appendWay((Way)p);
140 case RELATION:
141 return appendRelation((Relation)p);
142 }
143 return this;
144 }
145
146 /**
147 * appends a {@link Node} id to the list of ids which will be fetched from the server.
148 *
149 * @param node the node (ignored, if null)
150 * @return this
151 */
152 public MultiFetchServerObjectReader appendNode(Node node) {
153 if (node == null) return this;
154 remember(node.getPrimitiveId());
155 return this;
156 }
157
158 /**
159 * 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.
160 *
161 * @param way the way (ignored, if null)
162 * @return this
163 */
164 public MultiFetchServerObjectReader appendWay(Way way) {
165 if (way == null) return this;
166 if (way.isNew()) return this;
167 for (Node node: way.getNodes()) {
168 if (!node.isNew()) {
169 remember(node.getPrimitiveId());
170 }
171 }
172 remember(way.getPrimitiveId());
173 return this;
174 }
175
176 /**
177 * appends a {@link Relation} id to the list of ids which will be fetched from the server.
178 *
179 * @param relation the relation (ignored, if null)
180 * @return this
181 */
182 protected MultiFetchServerObjectReader appendRelation(Relation relation) {
183 if (relation == null) return this;
184 if (relation.isNew()) return this;
185 remember(relation.getPrimitiveId());
186 for (RelationMember member : relation.getMembers()) {
187 if (OsmPrimitiveType.from(member.getMember()).equals(OsmPrimitiveType.RELATION)) {
188 // avoid infinite recursion in case of cyclic dependencies in relations
189 //
190 if (relations.contains(member.getMember().getId())) {
191 continue;
192 }
193 }
194 if (!member.getMember().isIncomplete()) {
195 append(member.getMember());
196 }
197 }
198 return this;
199 }
200
201 /**
202 * appends an {@link OsmPrimitive} to the list of ids which will be fetched from the server.
203 * @param primitive the primitive
204 * @return this
205 */
206 public MultiFetchServerObjectReader append(OsmPrimitive primitive) {
207 if (primitive != null) {
208 switch (OsmPrimitiveType.from(primitive)) {
209 case NODE: return appendNode((Node)primitive);
210 case WAY: return appendWay((Way)primitive);
211 case RELATION: return appendRelation((Relation)primitive);
212 }
213 }
214 return this;
215 }
216
217 /**
218 * appends a list of {@link OsmPrimitive} to the list of ids which will be fetched from the server.
219 *
220 * @param primitives the list of primitives (ignored, if null)
221 * @return this
222 *
223 * @see #append(OsmPrimitive)
224 */
225 public MultiFetchServerObjectReader append(Collection<? extends OsmPrimitive> primitives) {
226 if (primitives == null) return this;
227 for (OsmPrimitive primitive : primitives) {
228 append(primitive);
229 }
230 return this;
231 }
232
233 /**
234 * extracts a subset of max {@link #MAX_IDS_PER_REQUEST} ids from <code>ids</code> and
235 * replies the subset. The extracted subset is removed from <code>ids</code>.
236 *
237 * @param ids a set of ids
238 * @return the subset of ids
239 */
240 protected Set<Long> extractIdPackage(Set<Long> ids) {
241 HashSet<Long> pkg = new HashSet<>();
242 if (ids.isEmpty())
243 return pkg;
244 if (ids.size() > MAX_IDS_PER_REQUEST) {
245 Iterator<Long> it = ids.iterator();
246 for (int i=0; i<MAX_IDS_PER_REQUEST; i++) {
247 pkg.add(it.next());
248 }
249 ids.removeAll(pkg);
250 } else {
251 pkg.addAll(ids);
252 ids.clear();
253 }
254 return pkg;
255 }
256
257 /**
258 * builds the Multi Get request string for a set of ids and a given
259 * {@link OsmPrimitiveType}.
260 *
261 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
262 * @param idPackage the package of ids
263 * @return the request string
264 */
265 protected static String buildRequestString(OsmPrimitiveType type, Set<Long> idPackage) {
266 StringBuilder sb = new StringBuilder();
267 sb.append(type.getAPIName()).append("s?")
268 .append(type.getAPIName()).append("s=");
269
270 Iterator<Long> it = idPackage.iterator();
271 for (int i=0; i<idPackage.size(); i++) {
272 sb.append(it.next());
273 if (i < idPackage.size()-1) {
274 sb.append(",");
275 }
276 }
277 return sb.toString();
278 }
279
280 /**
281 * builds the Multi Get request string for a single id and a given
282 * {@link OsmPrimitiveType}.
283 *
284 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
285 * @param id the id
286 * @return the request string
287 */
288 protected static String buildRequestString(OsmPrimitiveType type, long id) {
289 StringBuilder sb = new StringBuilder();
290 sb.append(type.getAPIName()).append("s?")
291 .append(type.getAPIName()).append("s=")
292 .append(id);
293 return sb.toString();
294 }
295
296 protected void rememberNodesOfIncompleteWaysToLoad(DataSet from) {
297 for (Way w: from.getWays()) {
298 if (w.hasIncompleteNodes()) {
299 for (Node n: w.getNodes()) {
300 if (n.isIncomplete()) {
301 nodes.add(n.getId());
302 }
303 }
304 }
305 }
306 }
307
308 /**
309 * merges the dataset <code>from</code> to {@link #outputDataSet}.
310 *
311 * @param from the other dataset
312 */
313 protected void merge(DataSet from) {
314 final DataSetMerger visitor = new DataSetMerger(outputDataSet,from);
315 visitor.merge();
316 }
317
318 /**
319 * fetches a set of ids of a given {@link OsmPrimitiveType} from the server
320 *
321 * @param ids the set of ids
322 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
323 * @throws OsmTransferException if an error occurs while communicating with the API server
324 */
325 protected void fetchPrimitives(Set<Long> ids, OsmPrimitiveType type, ProgressMonitor progressMonitor) throws OsmTransferException {
326 String msg = "";
327 String baseUrl = OsmApi.getOsmApi().getBaseUrl();
328 switch (type) {
329 case NODE: msg = tr("Fetching a package of nodes from ''{0}''", baseUrl); break;
330 case WAY: msg = tr("Fetching a package of ways from ''{0}''", baseUrl); break;
331 case RELATION: msg = tr("Fetching a package of relations from ''{0}''", baseUrl); break;
332 }
333 progressMonitor.setTicksCount(ids.size());
334 progressMonitor.setTicks(0);
335 // The complete set containg all primitives to fetch
336 Set<Long> toFetch = new HashSet<>(ids);
337 // Build a list of fetchers that will download smaller sets containing only MAX_IDS_PER_REQUEST (200) primitives each.
338 // we will run up to MAX_DOWNLOAD_THREADS concurrent fetchers.
339 int threadsNumber = Main.pref.getInteger("osm.download.threads", OsmApi.MAX_DOWNLOAD_THREADS);
340 threadsNumber = Math.min(Math.max(threadsNumber, 1), OsmApi.MAX_DOWNLOAD_THREADS);
341 Executor exec = Executors.newFixedThreadPool(threadsNumber);
342 CompletionService<FetchResult> ecs = new ExecutorCompletionService<>(exec);
343 List<Future<FetchResult>> jobs = new ArrayList<>();
344 while (!toFetch.isEmpty()) {
345 jobs.add(ecs.submit(new Fetcher(type, extractIdPackage(toFetch), progressMonitor)));
346 }
347 // Run the fetchers
348 for (int i = 0; i < jobs.size() && !isCanceled(); i++) {
349 progressMonitor.subTask(msg + "... " + progressMonitor.getTicks() + "/" + progressMonitor.getTicksCount());
350 try {
351 FetchResult result = ecs.take().get();
352 if (result.missingPrimitives != null) {
353 missingPrimitives.addAll(result.missingPrimitives);
354 }
355 if (result.dataSet != null && !isCanceled()) {
356 rememberNodesOfIncompleteWaysToLoad(result.dataSet);
357 merge(result.dataSet);
358 }
359 } catch (InterruptedException | ExecutionException e) {
360 Main.error(e);
361 }
362 }
363 // Cancel requests if the user choosed to
364 if (isCanceled()) {
365 for (Future<FetchResult> job : jobs) {
366 job.cancel(true);
367 }
368 }
369 }
370
371 /**
372 * invokes one or more Multi Gets to fetch the {@link OsmPrimitive}s and replies
373 * the dataset of retrieved primitives. Note that the dataset includes non visible primitives too!
374 * In contrast to a simple Get for a node, a way, or a relation, a Multi Get always replies
375 * the latest version of the primitive (if any), even if the primitive is not visible (i.e. if
376 * visible==false).
377 *
378 * Invoke {@link #getMissingPrimitives()} to get a list of primitives which have not been
379 * found on the server (the server response code was 404)
380 *
381 * @return the parsed data
382 * @throws OsmTransferException if an error occurs while communicating with the API server
383 * @see #getMissingPrimitives()
384 *
385 */
386 @Override
387 public DataSet parseOsm(ProgressMonitor progressMonitor) throws OsmTransferException {
388 int n = nodes.size() + ways.size() + relations.size();
389 progressMonitor.beginTask(trn("Downloading {0} object from ''{1}''", "Downloading {0} objects from ''{1}''", n, n, OsmApi.getOsmApi().getBaseUrl()));
390 try {
391 missingPrimitives = new HashSet<>();
392 if (isCanceled()) return null;
393 fetchPrimitives(ways,OsmPrimitiveType.WAY, progressMonitor);
394 if (isCanceled()) return null;
395 fetchPrimitives(nodes,OsmPrimitiveType.NODE, progressMonitor);
396 if (isCanceled()) return null;
397 fetchPrimitives(relations,OsmPrimitiveType.RELATION, progressMonitor);
398 if (outputDataSet != null) {
399 outputDataSet.deleteInvisible();
400 }
401 return outputDataSet;
402 } finally {
403 progressMonitor.finishTask();
404 }
405 }
406
407 /**
408 * replies the set of ids of all primitives for which a fetch request to the
409 * server was submitted but which are not available from the server (the server
410 * replied a return code of 404)
411 *
412 * @return the set of ids of missing primitives
413 */
414 public Set<PrimitiveId> getMissingPrimitives() {
415 return missingPrimitives;
416 }
417
418 /**
419 * The class holding the results given by {@link Fetcher}.
420 * It is only a wrapper of the resulting {@link DataSet} and the collection of {@link PrimitiveId} that could not have been loaded.
421 */
422 protected static class FetchResult {
423
424 /**
425 * The resulting data set
426 */
427 public final DataSet dataSet;
428
429 /**
430 * The collection of primitive ids that could not have been loaded
431 */
432 public final Set<PrimitiveId> missingPrimitives;
433
434 /**
435 * Constructs a {@code FetchResult}
436 * @param dataSet The resulting data set
437 * @param missingPrimitives The collection of primitive ids that could not have been loaded
438 */
439 public FetchResult(DataSet dataSet, Set<PrimitiveId> missingPrimitives) {
440 this.dataSet = dataSet;
441 this.missingPrimitives = missingPrimitives;
442 }
443 }
444
445 /**
446 * The class that actually download data from OSM API. Several instances of this class are used by {@link MultiFetchServerObjectReader} (one per set of primitives to fetch).
447 * The inheritance of {@link OsmServerReader} is only explained by the need to have a distinct OSM connection by {@code Fetcher} instance.
448 * @see FetchResult
449 */
450 protected static class Fetcher extends OsmServerReader implements Callable<FetchResult> {
451
452 private final Set<Long> pkg;
453 private final OsmPrimitiveType type;
454 private final ProgressMonitor progressMonitor;
455
456 /**
457 * Constructs a {@code Fetcher}
458 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
459 * @param idsPackage The set of primitives ids to fetch
460 * @param progressMonitor The progress monitor
461 */
462 public Fetcher(OsmPrimitiveType type, Set<Long> idsPackage, ProgressMonitor progressMonitor) {
463 this.pkg = idsPackage;
464 this.type = type;
465 this.progressMonitor = progressMonitor;
466 }
467
468 @Override
469 public DataSet parseOsm(ProgressMonitor progressMonitor) throws OsmTransferException {
470 // This method is implemented because of the OsmServerReader inheritance, but not used, as the main target of this class is the call() method.
471 return fetch(progressMonitor).dataSet;
472 }
473
474 @Override
475 public FetchResult call() throws Exception {
476 return fetch(progressMonitor);
477 }
478
479 /**
480 * fetches the requested primitives and updates the specified progress monitor.
481 * @param progressMonitor the progress monitor
482 * @return the {@link FetchResult} of this operation
483 * @throws OsmTransferException if an error occurs while communicating with the API server
484 */
485 protected FetchResult fetch(ProgressMonitor progressMonitor) throws OsmTransferException {
486 try {
487 return multiGetIdPackage(type, pkg, progressMonitor);
488 } catch (OsmApiException e) {
489 if (e.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
490 Main.info(tr("Server replied with response code 404, retrying with an individual request for each object."));
491 return singleGetIdPackage(type, pkg, progressMonitor);
492 } else {
493 throw e;
494 }
495 }
496 }
497
498 /**
499 * invokes a Multi Get for a set of ids and a given {@link OsmPrimitiveType}.
500 * The retrieved primitives are merged to {@link #outputDataSet}.
501 *
502 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
503 * @param pkg the package of ids
504 * @return the {@link FetchResult} of this operation
505 * @throws OsmTransferException if an error occurs while communicating with the API server
506 */
507 protected FetchResult multiGetIdPackage(OsmPrimitiveType type, Set<Long> pkg, ProgressMonitor progressMonitor) throws OsmTransferException {
508 String request = buildRequestString(type, pkg);
509 FetchResult result = null;
510 try (InputStream in = getInputStream(request, NullProgressMonitor.INSTANCE)) {
511 if (in == null) return null;
512 progressMonitor.subTask(tr("Downloading OSM data..."));
513 try {
514 result = new FetchResult(OsmReader.parseDataSet(in, progressMonitor.createSubTaskMonitor(pkg.size(), false)), null);
515 } catch (Exception e) {
516 throw new OsmTransferException(e);
517 }
518 } catch (IOException ex) {
519 Main.warn(ex);
520 }
521 return result;
522 }
523
524 /**
525 * invokes a Multi Get for a single id and a given {@link OsmPrimitiveType}.
526 * The retrieved primitive is merged to {@link #outputDataSet}.
527 *
528 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
529 * @param id the id
530 * @return the {@link DataSet} resulting of this operation
531 * @throws OsmTransferException if an error occurs while communicating with the API server
532 */
533 protected DataSet singleGetId(OsmPrimitiveType type, long id, ProgressMonitor progressMonitor) throws OsmTransferException {
534 String request = buildRequestString(type, id);
535 DataSet result = null;
536 try (InputStream in = getInputStream(request, NullProgressMonitor.INSTANCE)) {
537 if (in == null) return null;
538 progressMonitor.subTask(tr("Downloading OSM data..."));
539 try {
540 result = OsmReader.parseDataSet(in, progressMonitor.createSubTaskMonitor(1, false));
541 } catch (Exception e) {
542 throw new OsmTransferException(e);
543 }
544 } catch (IOException ex) {
545 Main.warn(ex);
546 }
547 return result;
548 }
549
550 /**
551 * invokes a sequence of Multi Gets for individual ids in a set of ids and a given {@link OsmPrimitiveType}.
552 * The retrieved primitives are merged to {@link #outputDataSet}.
553 *
554 * This method is used if one of the ids in pkg doesn't exist (the server replies with return code 404).
555 * If the set is fetched with this method it is possible to find out which of the ids doesn't exist.
556 * Unfortunately, the server does not provide an error header or an error body for a 404 reply.
557 *
558 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY}, {@link OsmPrimitiveType#RELATION RELATION}
559 * @param pkg the set of ids
560 * @return the {@link FetchResult} of this operation
561 * @throws OsmTransferException if an error occurs while communicating with the API server
562 */
563 protected FetchResult singleGetIdPackage(OsmPrimitiveType type, Set<Long> pkg, ProgressMonitor progressMonitor) throws OsmTransferException {
564 FetchResult result = new FetchResult(new DataSet(), new HashSet<PrimitiveId>());
565 String baseUrl = OsmApi.getOsmApi().getBaseUrl();
566 for (long id : pkg) {
567 try {
568 String msg = "";
569 switch (type) {
570 case NODE: msg = tr("Fetching node with id {0} from ''{1}''", id, baseUrl); break;
571 case WAY: msg = tr("Fetching way with id {0} from ''{1}''", id, baseUrl); break;
572 case RELATION: msg = tr("Fetching relation with id {0} from ''{1}''", id, baseUrl); break;
573 }
574 progressMonitor.setCustomText(msg);
575 result.dataSet.mergeFrom(singleGetId(type, id, progressMonitor));
576 } catch (OsmApiException e) {
577 if (e.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
578 Main.info(tr("Server replied with response code 404 for id {0}. Skipping.", Long.toString(id)));
579 result.missingPrimitives.add(new SimplePrimitiveId(id, type));
580 } else {
581 throw e;
582 }
583 }
584 }
585 return result;
586 }
587 }
588}
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