*             to {@link #MavenBuildTimestamp(Instant, String)} instead.
     */
    @Deprecated
    public MavenBuildTimestamp(Instant time, Properties properties) {
        this(time, properties != null ? properties.getProperty(BUILD_TIMESTAMP_FORMAT_PROPERTY) : null);
    }

    public MavenBuildTimestamp(Instant time, String timestampFormat) {

        return injector.getInstance(Session.class);
    }

    static class DefaultSession extends AbstractSession {

        private final Map<String, String> systemProperties;
        private Instant startTime = Instant.now();

        DefaultSession(RepositorySystemSession session, RepositorySystem repositorySystem, Lookup lookup) {
            this(session, repositorySystem, Collections.emptyList(), null, lookup);
        }

    public int getDegreeOfConcurrency() {
        return getMavenSession().getRequest().getDegreeOfConcurrency();
    }

    @Nonnull
    @Override
    public Instant getStartTime() {
        return getMavenSession().getRequest().getStartTime().toInstant();
    }

    @Override
    public Path getRootDirectory() {
        return getMavenSession().getRequest().getRootDirectory();
    }

    @Override

            valueSource.clearFeedback();
        }
    }

    static class BuildTimestampValueSource extends AbstractValueSource {
        private final Instant startTime;
        private final Map<String, String> properties;

        BuildTimestampValueSource(Instant startTime, Map<String, String> properties) {
            super(false);
            this.startTime = startTime;
            this.properties = properties;
        }

    public long getCurrentTimeAsLong() {
        return System.currentTimeMillis();
    }

    public LocalDateTime getCurrentTimeAsLocalDateTime() {
        final Instant instant = Instant.ofEpochMilli(getCurrentTimeAsLong());
        return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
    }

    public String getLogFilePath() {
        final String value = System.getProperty("fess.log.path");
        if (value != null) {

    /**
     * Shortcut for {@code getService(ArtifactInstaller.class).install(...)}.
     *
     * @param artifacts the artifacts to install
     * @throws org.apache.maven.api.services.ArtifactInstallerException if the artifacts installation failed
     *
     * @see org.apache.maven.api.services.ArtifactInstaller#install(Session, Collection)
     */
    void installArtifacts(@Nonnull Artifact... artifacts);

  public static <V extends @Nullable Object> ListenableFuture<V> immediateCancelledFuture() {
    ListenableFuture<Object> instance = ImmediateCancelledFuture.INSTANCE;
    if (instance != null) {
      return (ListenableFuture<V>) instance;
    }
    return new ImmediateCancelledFuture<>();
  }

  /**

            return determineBuildOutputDirectoryForArtifact(project, artifact);
        }

        // The fall-through indicates that the artifact cannot be found;
        // for instance if package produced nothing or classifier problems.
        return null;
    }

    private File determineBuildOutputDirectoryForArtifact(final MavenProject project, final Artifact artifact) {

   * way {@code IdentityHashMap} handles key lookups.
   *
   * @since 8.0
   */
  public static <E extends @Nullable Object> Set<E> newIdentityHashSet() {
    return Collections.newSetFromMap(Maps.<E, Boolean>newIdentityHashMap());
  }

  /**
   * Creates an empty {@code CopyOnWriteArraySet} instance.
   *

   * under {@code directExecutor}: Not only might the wait for a lock be long, but if the running
   * thread was holding a lock, the listener may deadlock or break lock isolation.
   *
   * <p>This instance is equivalent to:
   *
   * <pre>{@code
   * final class DirectExecutor implements Executor {
   *   public void execute(Runnable r) {
   *     r.run();
   *   }
   * }
   * }</pre>
   *