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

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package org.apache.maven.lifecycle.internal.builder.multithreaded;

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;

class ConcurrencyDependencyGraphTest {

    @Test
    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 dependencies
        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());
    }
}