private final List<MojoExecutionListener> listeners = new CopyOnWriteArrayList<>();

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

    @Override

        final AtomicInteger afterExecutionFailure = new AtomicInteger();
        final WeakMojoExecutionListener instance = new WeakMojoExecutionListener() {
            @Override
            public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
                beforeExecution.incrementAndGet();
            }

            @Override

        this.listeners = listeners; // NB this is live injected collection
    }

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

    @Override

        return MojoExecutionScope.<T>seededKeySupplier(clazz)::get;
    }

    @Override
    public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
        for (WeakMojoExecutionListener provided : getProvidedListeners()) {
            provided.beforeMojoExecution(event);
        }
    }

    @Override

 *
 * @see org.apache.maven.execution.MojoExecutionListener
 * @since 3.1.2
 */
public interface WeakMojoExecutionListener {
    void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException;

    void afterMojoExecutionSuccess(MojoExecutionEvent event) throws MojoExecutionException;

    void afterExecutionFailure(MojoExecutionEvent event);

 *
 * @see org.apache.maven.execution.scope.WeakMojoExecutionListener
 * @since 3.1.2
 */
public interface MojoExecutionListener {
    void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException;

    void afterMojoExecutionSuccess(MojoExecutionEvent event) throws MojoExecutionException;

    void afterExecutionFailure(MojoExecutionEvent event);