maven-core/src/test/java/org/apache/maven/lifecycle/internal/builder/multithreaded/ConcurrencyDependencyGraphTest.java

package org.apache.maven.lifecycle.internal.builder.multithreaded;
/*
 * 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.List;
import java.util.Set;

import org.apache.maven.execution.ProjectDependencyGraph;
import org.apache.maven.lifecycle.internal.ProjectBuildList;
import org.apache.maven.lifecycle.internal.stub.ProjectDependencyGraphStub;
import org.apache.maven.project.MavenProject;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class ConcurrencyDependencyGraphTest {

    @Test
    public void testGraph() throws Exception {

        ProjectBuildList projectBuildList = ProjectDependencyGraphStub.getProjectBuildList(
                ProjectDependencyGraphStub.getMavenSession() );

        ProjectDependencyGraph projectDependencyGraph = new ProjectDependencyGraphStub();

        ConcurrencyDependencyGraph graph = new ConcurrencyDependencyGraph( projectBuildList, projectDependencyGraph );

        // start
        assertEquals( 0, graph.getFinishedProjects().size() );
        assertEquals( 6, graph.getNumberOfBuilds() );

        List<MavenProject> rootSchedulableBuilds = graph.getRootSchedulableBuilds();
        // only Project.A has no dependences
        assertEquals( 1, rootSchedulableBuilds.size() );
        assertEquals( ProjectDependencyGraphStub.A, rootSchedulableBuilds.iterator().next() );
        // double check A deps
        List<MavenProject> dependenciesA = graph.getDependencies( ProjectDependencyGraphStub.A );
        assertEquals( 0, dependenciesA.size() );

        assertEquals( 6, graph.getUnfinishedProjects().size() );

        List<MavenProject> schedulableNewProcesses = graph.markAsFinished( ProjectDependencyGraphStub.A );
        // expect Project B, C
        assertEquals( 2, schedulableNewProcesses.size() );
        assertEquals( 1, graph.getFinishedProjects().size() );

        graph.markAsFinished( ProjectDependencyGraphStub.A );
        // still only  A
        assertEquals( 1, graph.getFinishedProjects().size() );

        Set<MavenProject> unfinishedProjects = graph.getUnfinishedProjects();
        assertEquals( 5, unfinishedProjects.size() );

        graph.markAsFinished( schedulableNewProcesses.get( 0 ) );
        assertEquals( 2, graph.getFinishedProjects().size() );
        assertEquals( 4, graph.getUnfinishedProjects().size() );

        List<MavenProject> dependenciesC = graph.getDependencies( ProjectDependencyGraphStub.C );
        // C depends only on A
        assertEquals( 1, dependenciesC.size() );

        List<MavenProject> dependenciesX = graph.getDependencies( ProjectDependencyGraphStub.X );
        // X depends only on B and C
        assertEquals( 2, dependenciesX.size() );

        List<MavenProject> activeDependenciesC = graph.getActiveDependencies( ProjectDependencyGraphStub.C );
        // A already finished
        assertEquals( 0, activeDependenciesC.size() );

        List<MavenProject> activeDependenciesX = graph.getActiveDependencies( ProjectDependencyGraphStub.X );
        // waiting for C
        assertEquals( 1, activeDependenciesX.size() );
    }
}