if (nEdges <= nV) {
            nE = 2 * nE;
        }

        checkEdges(nE);
    }

    private void checkVertices() {
        checkVertices(DEFAULT_VERTICES);
    }

    private void checkVertices(int nVertices) {
        if (vertices == null) {
            vertices = new TreeSet<>();
        }
    }

    private void checkEdges() {

        String projectKey = ArtifactUtils.versionlessKey(groupId, artifactId);

        Map<String, Vertex> vertices = vertexMap.get(projectKey);

        if (vertices != null) {
            if (isSpecificVersion(version)) {
                Vertex vertex = vertices.get(version);
                if (vertex != null) {
                    addEdge(projectVertex, vertex, project, projectMap, force, safe);

     * @param coordinate coordinates of the artifact to resolve
     * @return requested artifact together with the path to its file
     * @throws org.apache.maven.api.services.ArtifactResolverException if the artifact resolution failed
     *
     * @see org.apache.maven.api.services.ArtifactResolver#resolve(Session, Collection)
     */
    @Nonnull
    Map.Entry<Artifact, Path> resolveArtifact(@Nonnull ArtifactCoordinate coordinate);

import java.util.stream.Collectors;

import org.apache.maven.api.*;
import org.apache.maven.api.services.DependencyResolver;
import org.apache.maven.api.services.DependencyResolverResult;
import org.apache.maven.api.services.ProjectBuilder;
import org.apache.maven.api.services.ProjectBuilderRequest;
import org.apache.maven.api.services.SettingsBuilder;
import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;

   */
  public void testTransitionRace() throws TimeoutException {
    for (int k = 0; k < 1000; k++) {
      List<Service> services = Lists.newArrayList();
      for (int i = 0; i < 5; i++) {
        services.add(new SnappyShutdownService(i));
      }
      ServiceManager manager = new ServiceManager(services);
      manager.startAsync().awaitHealthy();
      manager.stopAsync().awaitStopped(10, TimeUnit.SECONDS);
    }
  }

import org.apache.maven.api.di.Singleton;
import org.apache.maven.api.model.Model;
import org.apache.maven.api.services.BuilderProblem;
import org.apache.maven.api.services.ModelBuilderRequest;
import org.apache.maven.api.services.ModelProblem;
import org.apache.maven.api.services.ModelProblemCollector;
import org.apache.maven.api.services.model.*;
import org.apache.maven.model.v4.MavenTransformer;

   * xStats().populationVariance() > 0.0 || yStats().populationVariance() > 0.0}). The result is
   * guaranteed to be horizontal if there is variance in the {@code x} data but not the {@code y}
   * data, and vertical if there is variance in the {@code y} data but not the {@code x} data.
   *
   * <p>This fit minimizes the root-mean-square error in {@code y} as a function of {@code x}. This

 * 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 gradlebuild.cleanup.services;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;

import java.util.stream.Collectors;
import java.util.zip.ZipEntry;

import org.apache.maven.RepositoryUtils;
import org.apache.maven.api.Project;
import org.apache.maven.api.Session;
import org.apache.maven.api.services.ProjectManager;
import org.apache.maven.api.xml.XmlNode;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.classrealm.ClassRealmManager;
import org.apache.maven.di.Injector;
import org.apache.maven.di.Key;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.apache.maven.api.SessionData;
import org.apache.maven.api.services.MessageBuilderFactory;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.apache.maven.artifact.resolver.filter.CumulativeScopeArtifactFilter;