artifactVersions = Collections.emptyList();
            }
            return artifactVersions;
        }

        public ResolutionGroup retrieve(MetadataResolutionRequest request) throws ArtifactMetadataRetrievalException {
            return retrieve(request.getArtifact(), request.getLocalRepository(), request.getRemoteRepositories());
        }

   * <p>The entry set is backed by the same data as the multiset, so any change to either is
   * immediately reflected in the other. However, multiset changes may or may not be reflected in
   * any {@code Entry} instances already retrieved from the entry set (this is
   * implementation-dependent). Furthermore, implementations are not required to support
   * modifications to the entry set at all, and the {@code Entry} instances themselves don't even

  // calculate names?

  /**
   * Creates an {@link Executor} that renames the {@link Thread threads} that its tasks run in.
   *
   * <p>The names are retrieved from the {@code nameSupplier} on the thread that is being renamed
   * right before each task is run. The renaming is best effort, if a {@link SecurityManager}

   *
   * @throws NoSuchElementException if the queue is empty
   */
  @CanIgnoreReturnValue
  public E removeFirst() {
    return remove();
  }

  /**
   * Retrieves, but does not remove, the least element of this queue, or returns {@code null} if the
   * queue is empty.
   */
  @CheckForNull
  public E peekFirst() {
    return peek();
  }

  /**

                }
            }
        } catch (IOException e) {
            LOGGER.error("Error while cleaning project local repository", e);
        }
    }

    /**
     * Retrieve a stream of the project's artifacts
     */
    private Stream<Artifact> getProjectArtifacts(MavenProject project) {
        Stream<org.apache.maven.artifact.Artifact> artifacts = Stream.concat(

            for (ArtifactRepository repository : repositories) {
                repository.setProxy(getProxy(session, repository));
            }
        }
    }

    public void retrieve(
            ArtifactRepository repository,
            File destination,
            String remotePath,
            ArtifactTransferListener transferListener)

    Iterable<List<Integer>> partitions = Iterables.partition(list, 2);

    // Changes before the partition is retrieved are reflected
    list.set(0, 3);

    Iterator<List<Integer>> iterator = partitions.iterator();

    // Changes before the partition is retrieved are reflected
    list.set(1, 4);

    List<Integer> first = iterator.next();

    // Changes after are not
    list.set(0, 5);

        } catch (ComponentLookupException e) {
            throw new PluginConfigurationException(
                    mojoDescriptor.getPluginDescriptor(),
                    "Unable to retrieve component configurator " + configuratorId + " for configuration of mojo "
                            + mojoDescriptor.getId(),
                    e);
        } catch (NoClassDefFoundError e) {

     * @throws org.apache.maven.api.services.MavenException if not called from the within a mojo execution
     */
    @Nonnull
    Map<String, Object> getPluginContext(@Nonnull Project project);

    /**
     * Retrieves the service for the interface
     *
     * @throws NoSuchElementException if the service could not be found
     */
    @Nonnull
    <T extends Service> T getService(@Nonnull Class<T> clazz);

    /**

        throw new UnsupportedOperationException("Cannot get available versions in this test case");
    }

    public ResolutionGroup retrieve(MetadataResolutionRequest request) throws ArtifactMetadataRetrievalException {
        return retrieve(request.getArtifact(), request.getLocalRepository(), request.getRemoteRepositories());
    }