001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.internal.impl;
020
021import javax.inject.Inject;
022import javax.inject.Named;
023import javax.inject.Singleton;
024
025import java.io.IOException;
026import java.nio.file.Files;
027import java.nio.file.Path;
028import java.nio.file.Paths;
029import java.util.ArrayList;
030import java.util.Collection;
031import java.util.Collections;
032import java.util.Iterator;
033import java.util.List;
034import java.util.Map;
035import java.util.concurrent.atomic.AtomicBoolean;
036
037import org.eclipse.aether.ConfigurationProperties;
038import org.eclipse.aether.RepositoryEvent;
039import org.eclipse.aether.RepositoryEvent.EventType;
040import org.eclipse.aether.RepositorySystemSession;
041import org.eclipse.aether.RequestTrace;
042import org.eclipse.aether.SyncContext;
043import org.eclipse.aether.artifact.Artifact;
044import org.eclipse.aether.impl.ArtifactResolver;
045import org.eclipse.aether.impl.OfflineController;
046import org.eclipse.aether.impl.RemoteRepositoryFilterManager;
047import org.eclipse.aether.impl.RemoteRepositoryManager;
048import org.eclipse.aether.impl.RepositoryConnectorProvider;
049import org.eclipse.aether.impl.RepositoryEventDispatcher;
050import org.eclipse.aether.impl.UpdateCheck;
051import org.eclipse.aether.impl.UpdateCheckManager;
052import org.eclipse.aether.impl.VersionResolver;
053import org.eclipse.aether.repository.ArtifactRepository;
054import org.eclipse.aether.repository.LocalArtifactRegistration;
055import org.eclipse.aether.repository.LocalArtifactRequest;
056import org.eclipse.aether.repository.LocalArtifactResult;
057import org.eclipse.aether.repository.LocalRepository;
058import org.eclipse.aether.repository.LocalRepositoryManager;
059import org.eclipse.aether.repository.RemoteRepository;
060import org.eclipse.aether.repository.RepositoryPolicy;
061import org.eclipse.aether.repository.WorkspaceReader;
062import org.eclipse.aether.resolution.ArtifactRequest;
063import org.eclipse.aether.resolution.ArtifactResolutionException;
064import org.eclipse.aether.resolution.ArtifactResult;
065import org.eclipse.aether.resolution.ResolutionErrorPolicy;
066import org.eclipse.aether.resolution.VersionRequest;
067import org.eclipse.aether.resolution.VersionResolutionException;
068import org.eclipse.aether.resolution.VersionResult;
069import org.eclipse.aether.scope.SystemDependencyScope;
070import org.eclipse.aether.spi.connector.ArtifactDownload;
071import org.eclipse.aether.spi.connector.RepositoryConnector;
072import org.eclipse.aether.spi.connector.filter.RemoteRepositoryFilter;
073import org.eclipse.aether.spi.io.PathProcessor;
074import org.eclipse.aether.spi.resolution.ArtifactResolverPostProcessor;
075import org.eclipse.aether.spi.synccontext.SyncContextFactory;
076import org.eclipse.aether.transfer.ArtifactFilteredOutException;
077import org.eclipse.aether.transfer.ArtifactNotFoundException;
078import org.eclipse.aether.transfer.ArtifactTransferException;
079import org.eclipse.aether.transfer.NoRepositoryConnectorException;
080import org.eclipse.aether.transfer.RepositoryOfflineException;
081import org.eclipse.aether.util.ConfigUtils;
082import org.slf4j.Logger;
083import org.slf4j.LoggerFactory;
084
085import static java.util.Objects.requireNonNull;
086
087/**
088 *
089 */
090@Singleton
091@Named
092public class DefaultArtifactResolver implements ArtifactResolver {
093
094    public static final String CONFIG_PROPS_PREFIX = ConfigurationProperties.PREFIX_AETHER + "artifactResolver.";
095
096    /**
097     * Configuration to enable "snapshot normalization", downloaded snapshots from remote with timestamped file names
098     * will have file names converted back to baseVersion. It replaces the timestamped snapshot file name with a
099     * filename containing the SNAPSHOT qualifier only. This only affects resolving/retrieving artifacts but not
100     * uploading those.
101     *
102     * @configurationSource {@link RepositorySystemSession#getConfigProperties()}
103     * @configurationType {@link java.lang.Boolean}
104     * @configurationDefaultValue {@link #DEFAULT_SNAPSHOT_NORMALIZATION}
105     */
106    public static final String CONFIG_PROP_SNAPSHOT_NORMALIZATION = CONFIG_PROPS_PREFIX + "snapshotNormalization";
107
108    public static final boolean DEFAULT_SNAPSHOT_NORMALIZATION = true;
109
110    /**
111     * Configuration to enable "interoperability" with Simple LRM, but this breaks RRF feature, hence this configuration
112     * is IGNORED when RRF is used, and is warmly recommended to leave it disabled even if no RRF is being used.
113     *
114     * @configurationSource {@link RepositorySystemSession#getConfigProperties()}
115     * @configurationType {@link java.lang.Boolean}
116     * @configurationDefaultValue {@link #DEFAULT_SIMPLE_LRM_INTEROP}
117     */
118    public static final String CONFIG_PROP_SIMPLE_LRM_INTEROP = CONFIG_PROPS_PREFIX + "simpleLrmInterop";
119
120    public static final boolean DEFAULT_SIMPLE_LRM_INTEROP = false;
121
122    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultArtifactResolver.class);
123
124    private final PathProcessor pathProcessor;
125
126    private final RepositoryEventDispatcher repositoryEventDispatcher;
127
128    private final VersionResolver versionResolver;
129
130    private final UpdateCheckManager updateCheckManager;
131
132    private final RepositoryConnectorProvider repositoryConnectorProvider;
133
134    private final RemoteRepositoryManager remoteRepositoryManager;
135
136    private final SyncContextFactory syncContextFactory;
137
138    private final OfflineController offlineController;
139
140    private final Map<String, ArtifactResolverPostProcessor> artifactResolverPostProcessors;
141
142    private final RemoteRepositoryFilterManager remoteRepositoryFilterManager;
143
144    @SuppressWarnings("checkstyle:parameternumber")
145    @Inject
146    public DefaultArtifactResolver(
147            PathProcessor pathProcessor,
148            RepositoryEventDispatcher repositoryEventDispatcher,
149            VersionResolver versionResolver,
150            UpdateCheckManager updateCheckManager,
151            RepositoryConnectorProvider repositoryConnectorProvider,
152            RemoteRepositoryManager remoteRepositoryManager,
153            SyncContextFactory syncContextFactory,
154            OfflineController offlineController,
155            Map<String, ArtifactResolverPostProcessor> artifactResolverPostProcessors,
156            RemoteRepositoryFilterManager remoteRepositoryFilterManager) {
157        this.pathProcessor = requireNonNull(pathProcessor, "path processor cannot be null");
158        this.repositoryEventDispatcher =
159                requireNonNull(repositoryEventDispatcher, "repository event dispatcher cannot be null");
160        this.versionResolver = requireNonNull(versionResolver, "version resolver cannot be null");
161        this.updateCheckManager = requireNonNull(updateCheckManager, "update check manager cannot be null");
162        this.repositoryConnectorProvider =
163                requireNonNull(repositoryConnectorProvider, "repository connector provider cannot be null");
164        this.remoteRepositoryManager =
165                requireNonNull(remoteRepositoryManager, "remote repository provider cannot be null");
166        this.syncContextFactory = requireNonNull(syncContextFactory, "sync context factory cannot be null");
167        this.offlineController = requireNonNull(offlineController, "offline controller cannot be null");
168        this.artifactResolverPostProcessors =
169                requireNonNull(artifactResolverPostProcessors, "artifact resolver post-processors cannot be null");
170        this.remoteRepositoryFilterManager =
171                requireNonNull(remoteRepositoryFilterManager, "remote repository filter manager cannot be null");
172    }
173
174    @Override
175    public ArtifactResult resolveArtifact(RepositorySystemSession session, ArtifactRequest request)
176            throws ArtifactResolutionException {
177        requireNonNull(session, "session cannot be null");
178        requireNonNull(request, "request cannot be null");
179
180        return resolveArtifacts(session, Collections.singleton(request)).get(0);
181    }
182
183    @Override
184    public List<ArtifactResult> resolveArtifacts(
185            RepositorySystemSession session, Collection<? extends ArtifactRequest> requests)
186            throws ArtifactResolutionException {
187        requireNonNull(session, "session cannot be null");
188        requireNonNull(requests, "requests cannot be null");
189        try (SyncContext shared = syncContextFactory.newInstance(session, true);
190                SyncContext exclusive = syncContextFactory.newInstance(session, false)) {
191            Collection<Artifact> artifacts = new ArrayList<>(requests.size());
192            SystemDependencyScope systemDependencyScope = session.getSystemDependencyScope();
193            for (ArtifactRequest request : requests) {
194                if (systemDependencyScope != null
195                        && systemDependencyScope.getSystemPath(request.getArtifact()) != null) {
196                    continue;
197                }
198                artifacts.add(request.getArtifact());
199            }
200
201            return resolve(shared, exclusive, artifacts, session, requests);
202        }
203    }
204
205    @SuppressWarnings("checkstyle:methodlength")
206    private List<ArtifactResult> resolve(
207            SyncContext shared,
208            SyncContext exclusive,
209            Collection<Artifact> subjects,
210            RepositorySystemSession session,
211            Collection<? extends ArtifactRequest> requests)
212            throws ArtifactResolutionException {
213        SystemDependencyScope systemDependencyScope = session.getSystemDependencyScope();
214        SyncContext current = shared;
215        try {
216            while (true) {
217                current.acquire(subjects, null);
218
219                boolean failures = false;
220                final List<ArtifactResult> results = new ArrayList<>(requests.size());
221                final boolean simpleLrmInterop =
222                        ConfigUtils.getBoolean(session, DEFAULT_SIMPLE_LRM_INTEROP, CONFIG_PROP_SIMPLE_LRM_INTEROP);
223                final LocalRepositoryManager lrm = session.getLocalRepositoryManager();
224                final WorkspaceReader workspace = session.getWorkspaceReader();
225                final List<ResolutionGroup> groups = new ArrayList<>();
226                // filter != null: means "filtering applied", if null no filtering applied (behave as before)
227                final RemoteRepositoryFilter filter = remoteRepositoryFilterManager.getRemoteRepositoryFilter(session);
228
229                for (ArtifactRequest request : requests) {
230                    RequestTrace trace = RequestTrace.newChild(request.getTrace(), request);
231
232                    ArtifactResult result = new ArtifactResult(request);
233                    results.add(result);
234
235                    Artifact artifact = request.getArtifact();
236
237                    if (current == shared) {
238                        artifactResolving(session, trace, artifact);
239                    }
240
241                    String localPath =
242                            systemDependencyScope != null ? systemDependencyScope.getSystemPath(artifact) : null;
243                    if (localPath != null) {
244                        // unhosted artifact, just validate file
245                        Path path = Paths.get(localPath);
246                        if (!Files.isRegularFile(path)) {
247                            failures = true;
248                            result.addException(
249                                    ArtifactResult.NO_REPOSITORY, new ArtifactNotFoundException(artifact, localPath));
250                        } else {
251                            artifact = artifact.setPath(path);
252                            result.setArtifact(artifact);
253                            artifactResolved(session, trace, artifact, null, result.getExceptions());
254                        }
255                        continue;
256                    }
257
258                    List<RemoteRepository> remoteRepositories = request.getRepositories();
259                    List<RemoteRepository> filteredRemoteRepositories = new ArrayList<>(remoteRepositories);
260                    if (filter != null) {
261                        for (RemoteRepository repository : remoteRepositories) {
262                            RemoteRepositoryFilter.Result filterResult = filter.acceptArtifact(repository, artifact);
263                            if (!filterResult.isAccepted()) {
264                                result.addException(
265                                        repository,
266                                        new ArtifactFilteredOutException(
267                                                artifact, repository, filterResult.reasoning()));
268                                filteredRemoteRepositories.remove(repository);
269                            }
270                        }
271                    }
272
273                    VersionResult versionResult;
274                    try {
275                        VersionRequest versionRequest =
276                                new VersionRequest(artifact, filteredRemoteRepositories, request.getRequestContext());
277                        versionRequest.setTrace(trace);
278                        versionResult = versionResolver.resolveVersion(session, versionRequest);
279                    } catch (VersionResolutionException e) {
280                        if (filteredRemoteRepositories.isEmpty()) {
281                            result.addException(lrm.getRepository(), e);
282                        } else {
283                            filteredRemoteRepositories.forEach(r -> result.addException(r, e));
284                        }
285                        continue;
286                    }
287
288                    artifact = artifact.setVersion(versionResult.getVersion());
289
290                    if (versionResult.getRepository() != null) {
291                        if (versionResult.getRepository() instanceof RemoteRepository) {
292                            filteredRemoteRepositories =
293                                    Collections.singletonList((RemoteRepository) versionResult.getRepository());
294                        } else {
295                            filteredRemoteRepositories = Collections.emptyList();
296                        }
297                    }
298
299                    if (workspace != null) {
300                        Path path = workspace.findArtifactPath(artifact);
301                        if (path != null) {
302                            artifact = artifact.setPath(path);
303                            result.setArtifact(artifact);
304                            result.setRepository(workspace.getRepository());
305                            artifactResolved(session, trace, artifact, result.getRepository(), null);
306                            continue;
307                        }
308                    }
309
310                    LocalArtifactResult local = lrm.find(
311                            session,
312                            new LocalArtifactRequest(
313                                    artifact, filteredRemoteRepositories, request.getRequestContext()));
314                    result.setLocalArtifactResult(local);
315                    boolean found = (filter != null && local.isAvailable()) || isLocallyInstalled(local, versionResult);
316                    // with filtering it is availability that drives logic
317                    // without filtering it is simply presence of file that drives the logic
318                    // "interop" logic with simple LRM leads to RRF breakage: hence is ignored when filtering in effect
319                    if (found) {
320                        if (local.getRepository() != null) {
321                            result.setRepository(local.getRepository());
322                        } else {
323                            result.setRepository(lrm.getRepository());
324                        }
325
326                        try {
327                            artifact = artifact.setPath(getPath(session, artifact, local.getPath()));
328                            result.setArtifact(artifact);
329                            artifactResolved(session, trace, artifact, result.getRepository(), null);
330                        } catch (ArtifactTransferException e) {
331                            result.addException(lrm.getRepository(), e);
332                        }
333                        if (filter == null && simpleLrmInterop && !local.isAvailable()) {
334                            /*
335                             * NOTE: Interop with simple local repository: An artifact installed by a simple local repo
336                             * manager will not show up in the repository tracking file of the enhanced local repository.
337                             * If however the maven-metadata-local.xml tells us the artifact was installed locally, we
338                             * sync the repository tracking file.
339                             */
340                            lrm.add(session, new LocalArtifactRegistration(artifact));
341                        }
342
343                        continue;
344                    }
345
346                    if (local.getPath() != null) {
347                        LOGGER.info(
348                                "Artifact {} is present in the local repository, but cached from a remote repository ID that is unavailable in current build context, verifying that is downloadable from {}",
349                                artifact,
350                                remoteRepositories);
351                    }
352
353                    LOGGER.debug("Resolving artifact {} from {}", artifact, remoteRepositories);
354                    AtomicBoolean resolved = new AtomicBoolean(false);
355                    Iterator<ResolutionGroup> groupIt = groups.iterator();
356                    for (RemoteRepository repo : filteredRemoteRepositories) {
357                        if (!repo.getPolicy(artifact.isSnapshot()).isEnabled()) {
358                            continue;
359                        }
360
361                        try {
362                            Utils.checkOffline(session, offlineController, repo);
363                        } catch (RepositoryOfflineException e) {
364                            Exception exception = new ArtifactNotFoundException(
365                                    artifact,
366                                    repo,
367                                    "Cannot access " + repo.getId() + " ("
368                                            + repo.getUrl() + ") in offline mode and the artifact " + artifact
369                                            + " has not been downloaded from it before.",
370                                    e);
371                            result.addException(repo, exception);
372                            continue;
373                        }
374
375                        ResolutionGroup group = null;
376                        while (groupIt.hasNext()) {
377                            ResolutionGroup t = groupIt.next();
378                            if (t.matches(repo)) {
379                                group = t;
380                                break;
381                            }
382                        }
383                        if (group == null) {
384                            group = new ResolutionGroup(repo);
385                            groups.add(group);
386                            groupIt = Collections.emptyIterator();
387                        }
388                        group.items.add(new ResolutionItem(trace, artifact, resolved, result, local, repo));
389                    }
390                }
391
392                if (!groups.isEmpty() && current == shared) {
393                    current.close();
394                    current = exclusive;
395                    continue;
396                }
397
398                for (ResolutionGroup group : groups) {
399                    performDownloads(session, group);
400                }
401
402                for (ArtifactResolverPostProcessor artifactResolverPostProcessor :
403                        artifactResolverPostProcessors.values()) {
404                    artifactResolverPostProcessor.postProcess(session, results);
405                }
406
407                for (ArtifactResult result : results) {
408                    ArtifactRequest request = result.getRequest();
409
410                    Artifact artifact = result.getArtifact();
411                    if (artifact == null || artifact.getPath() == null) {
412                        failures = true;
413                        if (result.getExceptions().isEmpty()) {
414                            Exception exception =
415                                    new ArtifactNotFoundException(request.getArtifact(), (RemoteRepository) null);
416                            result.addException(result.getRepository(), exception);
417                        }
418                        RequestTrace trace = RequestTrace.newChild(request.getTrace(), request);
419                        artifactResolved(session, trace, request.getArtifact(), null, result.getExceptions());
420                    }
421                }
422
423                if (failures) {
424                    throw new ArtifactResolutionException(results);
425                }
426
427                return results;
428            }
429        } finally {
430            current.close();
431        }
432    }
433
434    private boolean isLocallyInstalled(LocalArtifactResult lar, VersionResult vr) {
435        if (lar.isAvailable()) {
436            return true;
437        }
438        if (lar.getPath() != null) {
439            // resolution of version range found locally installed artifact
440            if (vr.getRepository() instanceof LocalRepository) {
441                // resolution of (snapshot) version found locally installed artifact
442                return true;
443            } else {
444                return vr.getRepository() == null
445                        && lar.getRequest().getRepositories().isEmpty();
446            }
447        }
448        return false;
449    }
450
451    private Path getPath(RepositorySystemSession session, Artifact artifact, Path path)
452            throws ArtifactTransferException {
453        if (artifact.isSnapshot()
454                && !artifact.getVersion().equals(artifact.getBaseVersion())
455                && ConfigUtils.getBoolean(
456                        session, DEFAULT_SNAPSHOT_NORMALIZATION, CONFIG_PROP_SNAPSHOT_NORMALIZATION)) {
457            String name = path.getFileName().toString().replace(artifact.getVersion(), artifact.getBaseVersion());
458            Path dst = path.getParent().resolve(name);
459
460            try {
461                long pathLastModified = pathProcessor.lastModified(path, 0L);
462                boolean copy = pathProcessor.size(dst, 0L) != pathProcessor.size(path, 0L)
463                        || pathProcessor.lastModified(dst, 0L) != pathLastModified;
464                if (copy) {
465                    pathProcessor.copyWithTimestamp(path, dst);
466                }
467            } catch (IOException e) {
468                throw new ArtifactTransferException(artifact, null, e);
469            }
470
471            path = dst;
472        }
473
474        return path;
475    }
476
477    private void performDownloads(RepositorySystemSession session, ResolutionGroup group) {
478        List<ArtifactDownload> downloads = gatherDownloads(session, group);
479        if (downloads.isEmpty()) {
480            return;
481        }
482
483        for (ArtifactDownload download : downloads) {
484            artifactDownloading(session, download.getTrace(), download.getArtifact(), group.repository);
485        }
486
487        try {
488            try (RepositoryConnector connector =
489                    repositoryConnectorProvider.newRepositoryConnector(session, group.repository)) {
490                connector.get(downloads, null);
491            }
492        } catch (NoRepositoryConnectorException e) {
493            for (ArtifactDownload download : downloads) {
494                download.setException(new ArtifactTransferException(download.getArtifact(), group.repository, e));
495            }
496        }
497
498        evaluateDownloads(session, group);
499    }
500
501    private List<ArtifactDownload> gatherDownloads(RepositorySystemSession session, ResolutionGroup group) {
502        LocalRepositoryManager lrm = session.getLocalRepositoryManager();
503        List<ArtifactDownload> downloads = new ArrayList<>();
504
505        for (ResolutionItem item : group.items) {
506            Artifact artifact = item.artifact;
507
508            if (item.resolved.get()) {
509                // resolved in previous resolution group
510                continue;
511            }
512
513            ArtifactDownload download = new ArtifactDownload();
514            download.setArtifact(artifact);
515            download.setRequestContext(item.request.getRequestContext());
516            download.setListener(SafeTransferListener.wrap(session));
517            download.setTrace(item.trace);
518            if (item.local.getPath() != null) {
519                download.setPath(item.local.getPath());
520                download.setExistenceCheck(true);
521            } else {
522                String path =
523                        lrm.getPathForRemoteArtifact(artifact, group.repository, item.request.getRequestContext());
524                download.setPath(lrm.getRepository().getBasePath().resolve(path));
525            }
526
527            boolean snapshot = artifact.isSnapshot();
528            RepositoryPolicy policy = remoteRepositoryManager.getPolicy(session, group.repository, !snapshot, snapshot);
529
530            int errorPolicy = Utils.getPolicy(session, artifact, group.repository);
531            if ((errorPolicy & ResolutionErrorPolicy.CACHE_ALL) != 0) {
532                UpdateCheck<Artifact, ArtifactTransferException> check = new UpdateCheck<>();
533                check.setItem(artifact);
534                check.setPath(download.getPath());
535                check.setFileValid(false);
536                check.setRepository(group.repository);
537                check.setArtifactPolicy(policy.getArtifactUpdatePolicy());
538                check.setMetadataPolicy(policy.getMetadataUpdatePolicy());
539                item.updateCheck = check;
540                updateCheckManager.checkArtifact(session, check);
541                if (!check.isRequired()) {
542                    item.result.addException(group.repository, check.getException());
543                    continue;
544                }
545            }
546
547            download.setChecksumPolicy(policy.getChecksumPolicy());
548            download.setRepositories(item.repository.getMirroredRepositories());
549            downloads.add(download);
550            item.download = download;
551        }
552
553        return downloads;
554    }
555
556    private void evaluateDownloads(RepositorySystemSession session, ResolutionGroup group) {
557        LocalRepositoryManager lrm = session.getLocalRepositoryManager();
558
559        for (ResolutionItem item : group.items) {
560            ArtifactDownload download = item.download;
561            if (download == null) {
562                continue;
563            }
564
565            Artifact artifact = download.getArtifact();
566            if (download.getException() == null) {
567                item.resolved.set(true);
568                item.result.setRepository(group.repository);
569                try {
570                    artifact = artifact.setPath(getPath(session, artifact, download.getPath()));
571                    item.result.setArtifact(artifact);
572
573                    lrm.add(
574                            session,
575                            new LocalArtifactRegistration(artifact, group.repository, download.getSupportedContexts()));
576                } catch (ArtifactTransferException e) {
577                    download.setException(e);
578                    item.result.addException(group.repository, e);
579                }
580            } else {
581                item.result.addException(group.repository, download.getException());
582            }
583
584            /*
585             * NOTE: Touch after registration with local repo to ensure concurrent resolution is not rejected with
586             * "already updated" via session data when actual update to local repo is still pending.
587             */
588            if (item.updateCheck != null) {
589                item.updateCheck.setException(download.getException());
590                updateCheckManager.touchArtifact(session, item.updateCheck);
591            }
592
593            artifactDownloaded(session, download.getTrace(), artifact, group.repository, download.getException());
594            if (download.getException() == null) {
595                artifactResolved(session, download.getTrace(), artifact, group.repository, null);
596            }
597        }
598    }
599
600    private void artifactResolving(RepositorySystemSession session, RequestTrace trace, Artifact artifact) {
601        RepositoryEvent.Builder event = new RepositoryEvent.Builder(session, EventType.ARTIFACT_RESOLVING);
602        event.setTrace(trace);
603        event.setArtifact(artifact);
604
605        repositoryEventDispatcher.dispatch(event.build());
606    }
607
608    private void artifactResolved(
609            RepositorySystemSession session,
610            RequestTrace trace,
611            Artifact artifact,
612            ArtifactRepository repository,
613            Collection<Exception> exceptions) {
614        RepositoryEvent.Builder event = new RepositoryEvent.Builder(session, EventType.ARTIFACT_RESOLVED);
615        event.setTrace(trace);
616        event.setArtifact(artifact);
617        event.setRepository(repository);
618        event.setExceptions(exceptions != null ? new ArrayList<>(exceptions) : null);
619        if (artifact != null) {
620            event.setPath(artifact.getPath());
621        }
622
623        repositoryEventDispatcher.dispatch(event.build());
624    }
625
626    private void artifactDownloading(
627            RepositorySystemSession session, RequestTrace trace, Artifact artifact, RemoteRepository repository) {
628        RepositoryEvent.Builder event = new RepositoryEvent.Builder(session, EventType.ARTIFACT_DOWNLOADING);
629        event.setTrace(trace);
630        event.setArtifact(artifact);
631        event.setRepository(repository);
632
633        repositoryEventDispatcher.dispatch(event.build());
634    }
635
636    private void artifactDownloaded(
637            RepositorySystemSession session,
638            RequestTrace trace,
639            Artifact artifact,
640            RemoteRepository repository,
641            Exception exception) {
642        RepositoryEvent.Builder event = new RepositoryEvent.Builder(session, EventType.ARTIFACT_DOWNLOADED);
643        event.setTrace(trace);
644        event.setArtifact(artifact);
645        event.setRepository(repository);
646        event.setException(exception);
647        if (artifact != null) {
648            event.setPath(artifact.getPath());
649        }
650
651        repositoryEventDispatcher.dispatch(event.build());
652    }
653
654    static class ResolutionGroup {
655
656        final RemoteRepository repository;
657
658        final List<ResolutionItem> items = new ArrayList<>();
659
660        ResolutionGroup(RemoteRepository repository) {
661            this.repository = repository;
662        }
663
664        boolean matches(RemoteRepository repo) {
665            return repository.getUrl().equals(repo.getUrl())
666                    && repository.getContentType().equals(repo.getContentType())
667                    && repository.isRepositoryManager() == repo.isRepositoryManager();
668        }
669    }
670
671    static class ResolutionItem {
672
673        final RequestTrace trace;
674
675        final ArtifactRequest request;
676
677        final ArtifactResult result;
678
679        final LocalArtifactResult local;
680
681        final RemoteRepository repository;
682
683        final Artifact artifact;
684
685        final AtomicBoolean resolved;
686
687        ArtifactDownload download;
688
689        UpdateCheck<Artifact, ArtifactTransferException> updateCheck;
690
691        ResolutionItem(
692                RequestTrace trace,
693                Artifact artifact,
694                AtomicBoolean resolved,
695                ArtifactResult result,
696                LocalArtifactResult local,
697                RemoteRepository repository) {
698            this.trace = trace;
699            this.artifact = artifact;
700            this.resolved = resolved;
701            this.result = result;
702            this.request = result.getRequest();
703            this.local = local;
704            this.repository = repository;
705        }
706    }
707}