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https://issues.apache.org/jira/browse/MNG-7619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17642995#comment-17642995
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ASF GitHub Bot commented on MNG-7619:
-------------------------------------
pzygielo commented on code in PR #900:
URL: https://github.com/apache/maven/pull/900#discussion_r1038965386
##########
maven-core/src/main/java/org/apache/maven/internal/aether/ReverseTreeRepositoryListener.java:
##########
@@ -0,0 +1,114 @@
+/*
+ * 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.
+ */
+package org.apache.maven.internal.aether;
+
+import static java.util.Objects.requireNonNull;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.ListIterator;
+import java.util.Objects;
+import org.eclipse.aether.AbstractRepositoryListener;
+import org.eclipse.aether.RepositoryEvent;
+import org.eclipse.aether.RequestTrace;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.collection.CollectStepData;
+import org.eclipse.aether.graph.Dependency;
+import org.eclipse.aether.graph.DependencyNode;
+
+/**
+ * A class building reverse tree using {@link CollectStepData} trace data
provided in {@link RepositoryEvent}
+ * events fired during collection.
+ *
+ * @since 3.9.0
+ */
+class ReverseTreeRepositoryListener extends AbstractRepositoryListener {
+ @Override
+ public void artifactResolved(RepositoryEvent event) {
+ requireNonNull(event, "event cannot be null");
+
+ if (!event.getArtifact()
+ .getFile()
+ .getPath()
+
.startsWith(event.getSession().getLocalRepository().getBasedir().getPath())) {
+ return; // reactor artifact
+ }
+ RequestTrace trace = event.getTrace();
+ CollectStepData collectStepTrace = null;
Review Comment:
Class method (static) would need no instance for test. Like it doesn't to do
its job.
> Maven should explain why an artifact is present in local repository
> -------------------------------------------------------------------
>
> Key: MNG-7619
> URL: https://issues.apache.org/jira/browse/MNG-7619
> Project: Maven
> Issue Type: Improvement
> Components: Dependencies
> Reporter: Tamas Cservenak
> Priority: Major
> Fix For: 3.9.0, 4.0.x-candidate, 4.0.0-alpha-3
>
>
> Ability to make Maven record:
> * why given artifact is present in local repository
> * record reverse dep tree how this artifact got resolved
> This is mostly for detecting dependency resolution anomalies, ideally best
> combined with {{-Dmaven.repo.local}} when you use new/empty local repo to
> build a project. After the build, you will end up with reverse dep trees in
> {{.tracking}} directories for each artifact.
> To enable, pass {{-Dmaven.repo.local.recordReverseTree}} on CLI.
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