*
 */
public class AbstractExecutionListener implements ExecutionListener {

    public void projectDiscoveryStarted(ExecutionEvent event) {
        // default does nothing
    }

    public void sessionStarted(ExecutionEvent event) {
        // default does nothing
    }

    public void sessionEnded(ExecutionEvent event) {
        // default does nothing
    }

    public void projectSkipped(ExecutionEvent event) {

        dispatcher.onEvent(event);
        delegate.projectDiscoveryStarted(event);
    }

    @Override
    public void sessionStarted(ExecutionEvent event) {
        dispatcher.onEvent(event);
        delegate.sessionStarted(event);
    }

    @Override
    public void sessionEnded(ExecutionEvent event) {
        dispatcher.onEvent(event);
        delegate.sessionEnded(event);
    }

 *
 */
public interface ExecutionEvent {

    /**
     * The possible types of execution events.
     */
    enum Type {
        ProjectDiscoveryStarted,
        SessionStarted,
        SessionEnded,
        ProjectSkipped,
        ProjectStarted,
        ProjectSucceeded,
        ProjectFailed,
        MojoSkipped,
        MojoStarted,
        MojoSucceeded,
        MojoFailed,

 * {@link AbstractExecutionListener} in order to avoid interoperability problems.
 *
 */
public interface ExecutionListener {

    void projectDiscoveryStarted(ExecutionEvent event);

    void sessionStarted(ExecutionEvent event);

    void sessionEnded(ExecutionEvent event);

    void projectSkipped(ExecutionEvent event);

    void projectStarted(ExecutionEvent event);

        ExecutionEvent projectStartedEvent3 = mock(ExecutionEvent.class);
        when(projectStartedEvent3.getProject()).thenReturn(project3);

        // execute
        executionEventLogger.sessionStarted(sessionStartedEvent);
        executionEventLogger.projectStarted(projectStartedEvent1);
        executionEventLogger.projectStarted(projectStartedEvent2);
        executionEventLogger.projectStarted(projectStartedEvent3);

        if (logger.isInfoEnabled()) {
            init();
            logger.info("Scanning for projects...");
        }
    }

    @Override
    public void sessionStarted(ExecutionEvent event) {
        if (logger.isInfoEnabled() && event.getSession().getProjects().size() > 1) {
            init();
            infoLine('-');

            infoMain("Reactor Build Order:");

import org.apache.maven.api.annotations.Experimental;

/**
 * The possible types of execution events.
 *
 * @since 4.0.0
 */
@Experimental
public enum EventType {
    PROJECT_DISCOVERY_STARTED,
    SESSION_STARTED,
    SESSION_ENDED,
    PROJECT_SKIPPED,
    PROJECT_STARTED,
    PROJECT_SUCCEEDED,
    PROJECT_FAILED,
    MOJO_SKIPPED,
    MOJO_STARTED,
    MOJO_SUCCEEDED,
    MOJO_FAILED,
    FORK_STARTED,