private final Collection<MojoExecutionListener> listeners;

    CompoundMojoExecutionListener(Collection<MojoExecutionListener> listeners) {
        this.listeners = listeners; // NB this is live injected collection
    }

    public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
        for (MojoExecutionListener listener : listeners) {
            listener.beforeMojoExecution(event);
        }
    }

        for (MojoExecutionListener listener : listeners) {
            listener.afterMojoExecutionSuccess(event);
        }
    }

    public void afterExecutionFailure(MojoExecutionEvent event) {
        for (MojoExecutionListener listener : listeners) {
            listener.afterExecutionFailure(event);
        }
    }

    public void addMojoExecutionListener(MojoExecutionListener listener) {
        this.listeners.add(listener);

        return updateScope;
    }

    private void fireEvent(int event, List<ResolutionListener> listeners, ResolutionNode node) {
        fireEvent(event, listeners, node, null);
    }

    private void fireEvent(int event, List<ResolutionListener> listeners, ResolutionNode node, Artifact replacement) {
        fireEvent(event, listeners, node, replacement, null);
    }

    private void fireEvent(
            int event,

                // won't happen
            }
        }

        if (listeners == null) {
            listeners = new ArrayList<>();

            if (logger.isDebugEnabled()) {
                listeners.add(new DebugResolutionListener(logger));
            }

            listeners.add(new WarningResolutionListener(logger));
        }

        for (ProjectExecutionListener listener : listeners) {
            listener.afterProjectExecutionFailure(event);
        }
    }

    public void addProjectExecutionListener(ProjectExecutionListener listener) {
        this.listeners.add(listener);
    }

    public void removeProjectExecutionListener(ProjectExecutionListener listener) {
        this.listeners.remove(listener);
    }

        IdentityHashMap<WeakMojoExecutionListener, Object> listeners = new IdentityHashMap<>();
        for (Object provided : getScopeState().provided.values()) {
            if (provided instanceof WeakMojoExecutionListener) {
                listeners.put((WeakMojoExecutionListener) provided, null);
            }
        }
        return listeners.keySet();
    }

    public List<ResolutionListener> getListeners() {
        return listeners;
    }

    public ArtifactResolutionRequest setListeners(List<ResolutionListener> listeners) {
        this.listeners = listeners;

        return this;
    }

    public ArtifactResolutionRequest addListener(ResolutionListener listener) {
        listeners.add(listener);

        return this;
    }

            List<ProjectExecutionListener> listeners,
            ConsumerPomArtifactTransformer consumerPomArtifactTransformer) {
        this.mojoExecutor = mojoExecutor;
        this.builderCommon = builderCommon;
        this.eventCatapult = eventCatapult;
        this.projectExecutionListener = new CompoundProjectExecutionListener(listeners);
        this.consumerPomArtifactTransformer = consumerPomArtifactTransformer;

            ArtifactRepository localRepository,
            List<ArtifactRepository> remoteRepositories,
            ArtifactMetadataSource source,
            ArtifactFilter filter,
            List<ResolutionListener> listeners)
            throws ArtifactResolutionException;

            ArtifactRepository localRepository,
            List<ArtifactRepository> remoteRepositories,
            ArtifactMetadataSource source,
            ArtifactFilter filter,
            List<ResolutionListener> listeners)
            throws ArtifactResolutionException, ArtifactNotFoundException;

    @Deprecated
    ArtifactResolutionResult resolveTransitively(
            Set<Artifact> artifacts,