public Optional<Boolean> relaxedChecksums() {
        return returnFirstPresentOrEmpty(MavenOptions::relaxedChecksums);
    }

    @Override
    public Optional<Boolean> failFast() {
        return returnFirstPresentOrEmpty(MavenOptions::failFast);
    }

    @Override
    public Optional<Boolean> failAtEnd() {
        return returnFirstPresentOrEmpty(MavenOptions::failAtEnd);
    }

    @Override

            cmdAndArguments.add("--strict-checksums");
        }
        if (mavenOptions.relaxedChecksums().orElse(false)) {
            cmdAndArguments.add("--lax-checksums");
        }
        if (mavenOptions.failFast().orElse(false)) {
            cmdAndArguments.add("--fail-fast");
        }
        if (mavenOptions.failAtEnd().orElse(false)) {
            cmdAndArguments.add("--fail-at-end");
        }

     *
     * @return an {@link Optional} containing true if Maven should stop at the first failure, false if not, or empty if not specified
     */
    @Nonnull
    Optional<Boolean> failFast();

    /**
     * Indicates whether Maven should run all builds but defer error reporting to the end.
     *

            return Optional.of(Boolean.TRUE);
        }
        return Optional.empty();
    }

    @Override
    public Optional<Boolean> failFast() {
        if (commandLine.hasOption(CLIManager.FAIL_FAST)) {
            return Optional.of(Boolean.TRUE);
        }
        return Optional.empty();
    }

    @Override
    public Optional<Boolean> failAtEnd() {

        }
    }

    protected String determineReactorFailureBehaviour(C context) {
        MavenOptions mavenOptions = context.invokerRequest.options();
        if (mavenOptions.failFast().isPresent()) {
            return MavenExecutionRequest.REACTOR_FAIL_FAST;
        } else if (mavenOptions.failAtEnd().isPresent()) {
            return MavenExecutionRequest.REACTOR_FAIL_AT_END;

    }

    public void setFailureBehavior(String failureBehavior) {
        if (failureBehavior == null) {
            this.failureBehavior = FAIL_FAST; // default
            return;
        }
        if (FAIL_FAST.equals(failureBehavior)
                || FAIL_AT_END.equals(failureBehavior)
                || FAIL_NEVER.equals(failureBehavior)) {
            this.failureBehavior = failureBehavior;

    @Deprecated
    public static final String ALTERNATE_GLOBAL_TOOLCHAINS = "gt";

    public static final String ALTERNATE_INSTALLATION_TOOLCHAINS = "it";

    public static final String FAIL_FAST = "ff";

    public static final String FAIL_ON_SEVERITY = "fos";

    public static final String FAIL_AT_END = "fae";

    public static final String FAIL_NEVER = "fn";

    // ----------------------------------------------------------------------
    // Reactor Failure Mode
    // ----------------------------------------------------------------------

    String REACTOR_FAIL_FAST = "FAIL_FAST";

    String REACTOR_FAIL_AT_END = "FAIL_AT_END";

    String REACTOR_FAIL_NEVER = "FAIL_NEVER";

    // ----------------------------------------------------------------------
    // Reactor Make Mode

        } else {
            return executionListener;
        }
    }

    private String determineReactorFailureBehaviour(final CommandLine commandLine) {
        if (commandLine.hasOption(CLIManager.FAIL_FAST)) {
            return MavenExecutionRequest.REACTOR_FAIL_FAST;
        } else if (commandLine.hasOption(CLIManager.FAIL_AT_END)) {
            return MavenExecutionRequest.REACTOR_FAIL_AT_END;