cstamas commented on code in PR #161: URL: https://github.com/apache/maven-resolver/pull/161#discussion_r845927475
########## maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/collect/df/DfDependencyCollector.java: ########## @@ -0,0 +1,866 @@ +package org.eclipse.aether.internal.impl.collect.df; + +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import static java.util.Objects.requireNonNull; + +import javax.inject.Inject; +import javax.inject.Named; +import javax.inject.Singleton; + +import org.eclipse.aether.DefaultRepositorySystemSession; +import org.eclipse.aether.RepositoryException; +import org.eclipse.aether.RepositorySystemSession; +import org.eclipse.aether.RequestTrace; +import org.eclipse.aether.artifact.Artifact; +import org.eclipse.aether.artifact.ArtifactProperties; +import org.eclipse.aether.collection.CollectRequest; +import org.eclipse.aether.collection.CollectResult; +import org.eclipse.aether.collection.DependencyCollectionException; +import org.eclipse.aether.collection.DependencyGraphTransformer; +import org.eclipse.aether.collection.DependencyManagement; +import org.eclipse.aether.collection.DependencyManager; +import org.eclipse.aether.collection.DependencySelector; +import org.eclipse.aether.collection.DependencyTraverser; +import org.eclipse.aether.collection.VersionFilter; +import org.eclipse.aether.graph.DefaultDependencyNode; +import org.eclipse.aether.graph.Dependency; +import org.eclipse.aether.graph.DependencyNode; +import org.eclipse.aether.graph.Exclusion; +import org.eclipse.aether.impl.ArtifactDescriptorReader; +import org.eclipse.aether.impl.RemoteRepositoryManager; +import org.eclipse.aether.impl.VersionRangeResolver; +import org.eclipse.aether.internal.impl.collect.CachingArtifactTypeRegistry; +import org.eclipse.aether.internal.impl.collect.DataPool; +import org.eclipse.aether.internal.impl.collect.DefaultDependencyCollectionContext; +import org.eclipse.aether.internal.impl.collect.DefaultDependencyCycle; +import org.eclipse.aether.internal.impl.collect.DefaultDependencyGraphTransformationContext; +import org.eclipse.aether.internal.impl.collect.DefaultVersionFilterContext; +import org.eclipse.aether.internal.impl.collect.DependencyCollectorDelegate; +import org.eclipse.aether.repository.ArtifactRepository; +import org.eclipse.aether.repository.RemoteRepository; +import org.eclipse.aether.resolution.ArtifactDescriptorException; +import org.eclipse.aether.resolution.ArtifactDescriptorRequest; +import org.eclipse.aether.resolution.ArtifactDescriptorResult; +import org.eclipse.aether.resolution.VersionRangeRequest; +import org.eclipse.aether.resolution.VersionRangeResolutionException; +import org.eclipse.aether.resolution.VersionRangeResult; +import org.eclipse.aether.spi.locator.Service; +import org.eclipse.aether.util.ConfigUtils; +import org.eclipse.aether.util.graph.manager.DependencyManagerUtils; +import org.eclipse.aether.util.graph.transformer.TransformationContextKeys; +import org.eclipse.aether.version.Version; + +/** + * Depth-first {@link org.eclipse.aether.impl.DependencyCollector} (the "original" default). Originally + * this class was located a package higher (as "default" implementation). + * + * @since 1.8.0 + */ +@Singleton +@Named( DfDependencyCollector.NAME ) +public class DfDependencyCollector + extends DependencyCollectorDelegate implements Service +{ + public static final String NAME = "df"; + + public DfDependencyCollector() + { + // enables default constructor + } + + @Inject + DfDependencyCollector( RemoteRepositoryManager remoteRepositoryManager, + ArtifactDescriptorReader artifactDescriptorReader, + VersionRangeResolver versionRangeResolver ) + { + super( remoteRepositoryManager, artifactDescriptorReader, versionRangeResolver ); + } + + @SuppressWarnings( "checkstyle:methodlength" ) + public CollectResult collectDependencies( RepositorySystemSession session, CollectRequest request ) + throws DependencyCollectionException + { + requireNonNull( session, "session cannot be null" ); + requireNonNull( request, "request cannot be null" ); + session = optimizeSession( session ); + + RequestTrace trace = RequestTrace.newChild( request.getTrace(), request ); + + CollectResult result = new CollectResult( request ); + + DependencySelector depSelector = session.getDependencySelector(); + DependencyManager depManager = session.getDependencyManager(); + DependencyTraverser depTraverser = session.getDependencyTraverser(); + VersionFilter verFilter = session.getVersionFilter(); + + Dependency root = request.getRoot(); + List<RemoteRepository> repositories = request.getRepositories(); + List<Dependency> dependencies = request.getDependencies(); + List<Dependency> managedDependencies = request.getManagedDependencies(); + + Map<String, Object> stats = new LinkedHashMap<>(); + long time1 = System.nanoTime(); + + DefaultDependencyNode node; + if ( root != null ) + { + List<? extends Version> versions; + VersionRangeResult rangeResult; + try + { + VersionRangeRequest rangeRequest = + new VersionRangeRequest( root.getArtifact(), request.getRepositories(), + request.getRequestContext() ); + rangeRequest.setTrace( trace ); + rangeResult = versionRangeResolver.resolveVersionRange( session, rangeRequest ); + versions = filterVersions( root, rangeResult, verFilter, new DefaultVersionFilterContext( session ) ); + } + catch ( VersionRangeResolutionException e ) + { + result.addException( e ); + throw new DependencyCollectionException( result, e.getMessage() ); + } + + Version version = versions.get( versions.size() - 1 ); + root = root.setArtifact( root.getArtifact().setVersion( version.toString() ) ); + + ArtifactDescriptorResult descriptorResult; + try + { + ArtifactDescriptorRequest descriptorRequest = new ArtifactDescriptorRequest(); + descriptorRequest.setArtifact( root.getArtifact() ); + descriptorRequest.setRepositories( request.getRepositories() ); + descriptorRequest.setRequestContext( request.getRequestContext() ); + descriptorRequest.setTrace( trace ); + if ( isLackingDescriptor( root.getArtifact() ) ) + { + descriptorResult = new ArtifactDescriptorResult( descriptorRequest ); + } + else + { + descriptorResult = descriptorReader.readArtifactDescriptor( session, descriptorRequest ); + } + } + catch ( ArtifactDescriptorException e ) + { + result.addException( e ); + throw new DependencyCollectionException( result, e.getMessage() ); + } + + root = root.setArtifact( descriptorResult.getArtifact() ); + + if ( !session.isIgnoreArtifactDescriptorRepositories() ) + { + repositories = remoteRepositoryManager.aggregateRepositories( session, repositories, + descriptorResult.getRepositories(), + true ); + } + dependencies = mergeDeps( dependencies, descriptorResult.getDependencies() ); + managedDependencies = mergeDeps( managedDependencies, descriptorResult.getManagedDependencies() ); + + node = new DefaultDependencyNode( root ); + node.setRequestContext( request.getRequestContext() ); + node.setRelocations( descriptorResult.getRelocations() ); + node.setVersionConstraint( rangeResult.getVersionConstraint() ); + node.setVersion( version ); + node.setAliases( descriptorResult.getAliases() ); + node.setRepositories( request.getRepositories() ); + } + else + { + node = new DefaultDependencyNode( request.getRootArtifact() ); + node.setRequestContext( request.getRequestContext() ); + node.setRepositories( request.getRepositories() ); + } + + result.setRoot( node ); + + boolean traverse = root == null || depTraverser == null || depTraverser.traverseDependency( root ); + String errorPath = null; + if ( traverse && !dependencies.isEmpty() ) + { + DataPool pool = new DataPool( session ); + + NodeStack nodes = new NodeStack(); + nodes.push( node ); + + DefaultDependencyCollectionContext context = + new DefaultDependencyCollectionContext( session, request.getRootArtifact(), root, managedDependencies ); + + DefaultVersionFilterContext versionContext = new DefaultVersionFilterContext( session ); + + Args args = new Args( session, trace, pool, nodes, context, versionContext, request ); + Results results = new Results( result, session ); + + process( args, results, dependencies, repositories, + depSelector != null ? depSelector.deriveChildSelector( context ) : null, + depManager != null ? depManager.deriveChildManager( context ) : null, + depTraverser != null ? depTraverser.deriveChildTraverser( context ) : null, + verFilter != null ? verFilter.deriveChildFilter( context ) : null ); + + errorPath = results.errorPath; + } + + long time2 = System.nanoTime(); + + DependencyGraphTransformer transformer = session.getDependencyGraphTransformer(); + if ( transformer != null ) + { + try + { + DefaultDependencyGraphTransformationContext context = + new DefaultDependencyGraphTransformationContext( session ); + context.put( TransformationContextKeys.STATS, stats ); + result.setRoot( transformer.transformGraph( node, context ) ); + } + catch ( RepositoryException e ) + { + result.addException( e ); + } + } + + long time3 = System.nanoTime(); + stats.put( "DefaultDependencyCollector.collectTime", time2 - time1 ); + stats.put( "DefaultDependencyCollector.transformTime", time3 - time2 ); + logger.debug( "Dependency collection stats {}", stats ); + + if ( errorPath != null ) + { + throw new DependencyCollectionException( result, "Failed to collect dependencies at " + errorPath ); + } + if ( !result.getExceptions().isEmpty() ) + { + throw new DependencyCollectionException( result ); + } + + return result; + } + + private static RepositorySystemSession optimizeSession( RepositorySystemSession session ) + { + DefaultRepositorySystemSession optimized = new DefaultRepositorySystemSession( session ); + optimized.setArtifactTypeRegistry( CachingArtifactTypeRegistry.newInstance( session ) ); + return optimized; + } + + private List<Dependency> mergeDeps( List<Dependency> dominant, List<Dependency> recessive ) + { + List<Dependency> result; + if ( dominant == null || dominant.isEmpty() ) + { + result = recessive; + } + else if ( recessive == null || recessive.isEmpty() ) + { + result = dominant; + } + else + { + int initialCapacity = dominant.size() + recessive.size(); + result = new ArrayList<>( initialCapacity ); + Collection<String> ids = new HashSet<>( initialCapacity, 1.0f ); + for ( Dependency dependency : dominant ) + { + ids.add( getId( dependency.getArtifact() ) ); + result.add( dependency ); + } + for ( Dependency dependency : recessive ) + { + if ( !ids.contains( getId( dependency.getArtifact() ) ) ) + { + result.add( dependency ); + } + } + } + return result; + } + + private static String getId( Artifact a ) + { + return a.getGroupId() + ':' + a.getArtifactId() + ':' + a.getClassifier() + ':' + a.getExtension(); + } + + @SuppressWarnings( "checkstyle:parameternumber" ) + private void process( final Args args, Results results, List<Dependency> dependencies, + List<RemoteRepository> repositories, DependencySelector depSelector, + DependencyManager depManager, DependencyTraverser depTraverser, VersionFilter verFilter ) + { + for ( Dependency dependency : dependencies ) + { + processDependency( args, results, repositories, depSelector, depManager, depTraverser, verFilter, + dependency ); + } + } + + @SuppressWarnings( "checkstyle:parameternumber" ) + private void processDependency( Args args, Results results, List<RemoteRepository> repositories, + DependencySelector depSelector, DependencyManager depManager, + DependencyTraverser depTraverser, VersionFilter verFilter, Dependency dependency ) + { + + List<Artifact> relocations = Collections.emptyList(); + processDependency( args, results, repositories, depSelector, depManager, depTraverser, verFilter, dependency, + relocations, false ); + } + + @SuppressWarnings( "checkstyle:parameternumber" ) + private void processDependency( Args args, Results results, List<RemoteRepository> repositories, + DependencySelector depSelector, DependencyManager depManager, + DependencyTraverser depTraverser, VersionFilter verFilter, Dependency dependency, + List<Artifact> relocations, boolean disableVersionManagement ) + { + + if ( depSelector != null && !depSelector.selectDependency( dependency ) ) + { + return; + } + + PremanagedDependency preManaged = + PremanagedDependency.create( depManager, dependency, disableVersionManagement, args.premanagedState ); + dependency = preManaged.managedDependency; + + boolean noDescriptor = isLackingDescriptor( dependency.getArtifact() ); + + boolean traverse = !noDescriptor && ( depTraverser == null || depTraverser.traverseDependency( dependency ) ); + + List<? extends Version> versions; + VersionRangeResult rangeResult; + try + { + VersionRangeRequest rangeRequest = createVersionRangeRequest( args, repositories, dependency ); + + rangeResult = cachedResolveRangeResult( rangeRequest, args.pool, args.session ); + + versions = filterVersions( dependency, rangeResult, verFilter, args.versionContext ); + } + catch ( VersionRangeResolutionException e ) + { + results.addException( dependency, e, args.nodes ); + return; + } + + for ( Version version : versions ) + { + Artifact originalArtifact = dependency.getArtifact().setVersion( version.toString() ); + Dependency d = dependency.setArtifact( originalArtifact ); + + ArtifactDescriptorRequest descriptorRequest = createArtifactDescriptorRequest( args, repositories, d ); + + final ArtifactDescriptorResult descriptorResult = + getArtifactDescriptorResult( args, results, noDescriptor, d, descriptorRequest ); + if ( descriptorResult != null ) + { + d = d.setArtifact( descriptorResult.getArtifact() ); + + DependencyNode node = args.nodes.top(); + + int cycleEntry = DefaultDependencyCycle.find( args.nodes.nodes, d.getArtifact() ); + if ( cycleEntry >= 0 ) + { + results.addCycle( args.nodes, cycleEntry, d ); + DependencyNode cycleNode = args.nodes.get( cycleEntry ); + if ( cycleNode.getDependency() != null ) + { + DefaultDependencyNode child = + createDependencyNode( relocations, preManaged, rangeResult, version, d, descriptorResult, + cycleNode ); + node.getChildren().add( child ); + continue; + } + } + + if ( !descriptorResult.getRelocations().isEmpty() ) + { + boolean disableVersionManagementSubsequently = + originalArtifact.getGroupId().equals( d.getArtifact().getGroupId() ) + && originalArtifact.getArtifactId().equals( d.getArtifact().getArtifactId() ); + + processDependency( args, results, repositories, depSelector, depManager, depTraverser, verFilter, d, + descriptorResult.getRelocations(), disableVersionManagementSubsequently ); + return; + } + else + { + d = args.pool.intern( d.setArtifact( args.pool.intern( d.getArtifact() ) ) ); + + List<RemoteRepository> repos = + getRemoteRepositories( rangeResult.getRepository( version ), repositories ); + + DefaultDependencyNode child = + createDependencyNode( relocations, preManaged, rangeResult, version, d, + descriptorResult.getAliases(), repos, args.request.getRequestContext() ); + + node.getChildren().add( child ); + + boolean recurse = traverse && !descriptorResult.getDependencies().isEmpty(); + if ( recurse ) + { + doRecurse( args, results, repositories, depSelector, depManager, depTraverser, verFilter, d, + descriptorResult, child ); + } + } + } + else + { + DependencyNode node = args.nodes.top(); + List<RemoteRepository> repos = + getRemoteRepositories( rangeResult.getRepository( version ), repositories ); + DefaultDependencyNode child = + createDependencyNode( relocations, preManaged, rangeResult, version, d, null, repos, + args.request.getRequestContext() ); + node.getChildren().add( child ); + } + } + } + + @SuppressWarnings( "checkstyle:parameternumber" ) + private void doRecurse( Args args, Results results, List<RemoteRepository> repositories, + DependencySelector depSelector, DependencyManager depManager, + DependencyTraverser depTraverser, VersionFilter verFilter, Dependency d, + ArtifactDescriptorResult descriptorResult, DefaultDependencyNode child ) + { + DefaultDependencyCollectionContext context = args.collectionContext; + context.set( d, descriptorResult.getManagedDependencies() ); + + DependencySelector childSelector = depSelector != null ? depSelector.deriveChildSelector( context ) : null; + DependencyManager childManager = depManager != null ? depManager.deriveChildManager( context ) : null; + DependencyTraverser childTraverser = depTraverser != null ? depTraverser.deriveChildTraverser( context ) : null; + VersionFilter childFilter = verFilter != null ? verFilter.deriveChildFilter( context ) : null; + + final List<RemoteRepository> childRepos = + args.ignoreRepos + ? repositories + : remoteRepositoryManager.aggregateRepositories( args.session, repositories, + descriptorResult.getRepositories(), true ); + + Object key = + args.pool.toKey( d.getArtifact(), childRepos, childSelector, childManager, childTraverser, childFilter ); + + List<DependencyNode> children = args.pool.getChildren( key ); + if ( children == null ) + { + args.pool.putChildren( key, child.getChildren() ); + + args.nodes.push( child ); + + process( args, results, descriptorResult.getDependencies(), childRepos, childSelector, childManager, + childTraverser, childFilter ); + + args.nodes.pop(); + } + else + { + child.setChildren( children ); + } + } + + private ArtifactDescriptorResult getArtifactDescriptorResult( Args args, Results results, boolean noDescriptor, + Dependency d, + ArtifactDescriptorRequest descriptorRequest ) + { + return noDescriptor + ? new ArtifactDescriptorResult( descriptorRequest ) + : resolveCachedArtifactDescriptor( args.pool, descriptorRequest, args.session, d, results, args ); + + } + + private ArtifactDescriptorResult resolveCachedArtifactDescriptor( DataPool pool, + ArtifactDescriptorRequest descriptorRequest, + RepositorySystemSession session, Dependency d, + Results results, Args args ) + { + Object key = pool.toKey( descriptorRequest ); + ArtifactDescriptorResult descriptorResult = pool.getDescriptor( key, descriptorRequest ); + if ( descriptorResult == null ) + { + try + { + descriptorResult = descriptorReader.readArtifactDescriptor( session, descriptorRequest ); + pool.putDescriptor( key, descriptorResult ); + } + catch ( ArtifactDescriptorException e ) + { + results.addException( d, e, args.nodes ); + pool.putDescriptor( key, e ); + return null; + } + + } + else if ( descriptorResult == DataPool.NO_DESCRIPTOR ) + { + return null; + } + + return descriptorResult; + } + + @SuppressWarnings( "checkstyle:parameternumber" ) + private static DefaultDependencyNode createDependencyNode( List<Artifact> relocations, + PremanagedDependency preManaged, + VersionRangeResult rangeResult, Version version, + Dependency d, Collection<Artifact> aliases, + List<RemoteRepository> repos, String requestContext ) + { + DefaultDependencyNode child = new DefaultDependencyNode( d ); + preManaged.applyTo( child ); + child.setRelocations( relocations ); + child.setVersionConstraint( rangeResult.getVersionConstraint() ); + child.setVersion( version ); + child.setAliases( aliases ); + child.setRepositories( repos ); + child.setRequestContext( requestContext ); + return child; + } + + private static DefaultDependencyNode createDependencyNode( List<Artifact> relocations, + PremanagedDependency preManaged, + VersionRangeResult rangeResult, Version version, + Dependency d, ArtifactDescriptorResult descriptorResult, + DependencyNode cycleNode ) + { + DefaultDependencyNode child = + createDependencyNode( relocations, preManaged, rangeResult, version, d, descriptorResult.getAliases(), + cycleNode.getRepositories(), cycleNode.getRequestContext() ); + child.setChildren( cycleNode.getChildren() ); + return child; + } + + private static ArtifactDescriptorRequest createArtifactDescriptorRequest( Args args, + List<RemoteRepository> repositories, + Dependency d ) + { + ArtifactDescriptorRequest descriptorRequest = new ArtifactDescriptorRequest(); + descriptorRequest.setArtifact( d.getArtifact() ); + descriptorRequest.setRepositories( repositories ); + descriptorRequest.setRequestContext( args.request.getRequestContext() ); + descriptorRequest.setTrace( args.trace ); + return descriptorRequest; + } + + private static VersionRangeRequest createVersionRangeRequest( Args args, List<RemoteRepository> repositories, + Dependency dependency ) + { + VersionRangeRequest rangeRequest = new VersionRangeRequest(); + rangeRequest.setArtifact( dependency.getArtifact() ); + rangeRequest.setRepositories( repositories ); + rangeRequest.setRequestContext( args.request.getRequestContext() ); + rangeRequest.setTrace( args.trace ); + return rangeRequest; + } + + private VersionRangeResult cachedResolveRangeResult( VersionRangeRequest rangeRequest, DataPool pool, + RepositorySystemSession session ) + throws VersionRangeResolutionException + { + Object key = pool.toKey( rangeRequest ); + VersionRangeResult rangeResult = pool.getConstraint( key, rangeRequest ); + if ( rangeResult == null ) + { + rangeResult = versionRangeResolver.resolveVersionRange( session, rangeRequest ); + pool.putConstraint( key, rangeResult ); + } + return rangeResult; + } + + private static boolean isLackingDescriptor( Artifact artifact ) + { + return artifact.getProperty( ArtifactProperties.LOCAL_PATH, null ) != null; + } + + private static List<RemoteRepository> getRemoteRepositories( ArtifactRepository repository, + List<RemoteRepository> repositories ) + { + if ( repository instanceof RemoteRepository ) + { + return Collections.singletonList( (RemoteRepository) repository ); + } + if ( repository != null ) + { + return Collections.emptyList(); + } + return repositories; + } + + private static List<? extends Version> filterVersions( Dependency dependency, VersionRangeResult rangeResult, + VersionFilter verFilter, + DefaultVersionFilterContext verContext ) + throws VersionRangeResolutionException + { + if ( rangeResult.getVersions().isEmpty() ) + { + throw new VersionRangeResolutionException( rangeResult, + "No versions available for " + dependency.getArtifact() + + " within specified range" ); + } + + List<? extends Version> versions; + if ( verFilter != null && rangeResult.getVersionConstraint().getRange() != null ) + { + verContext.set( dependency, rangeResult ); + try + { + verFilter.filterVersions( verContext ); + } + catch ( RepositoryException e ) + { + throw new VersionRangeResolutionException( rangeResult, + "Failed to filter versions for " + dependency.getArtifact() + + ": " + e.getMessage(), e ); Review Comment: am unsure is changing log output in scope of this PR -- This is an automated message from the Apache Git Service. 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