String msg = str + " aggregator mojo is already being executed "
                            + "in this parallel build, those kind of mojos require exclusive access to "
                            + "reactor to prevent race conditions. This mojo execution will be blocked "
                            + "until the aggregator mojo is done.";
                    warn(msg);

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Indicates that the annotated bean has a lifespan limited to a given mojo execution,
 * which means each mojo execution will result in a different instance being injected.
 *
 * TODO: this is currently not implemented
 *
 * @since 4.0.0
 */
@Scope
@Documented
@Retention(RUNTIME)

    /**
     * This is the case where the Mojo wants to execute on every project and then do something at the end
     * with the results of each project.
     */
    @Test
    void testAggregatorMojo() throws Exception {}

    /**
     * This is the case where a Mojo needs the lifecycle run to a certain phase before it can do
     * anything useful.
     */
    @Test

      as above.

** Control over mojos in the lifecycle

  When binding a mojo to the project's lifecycle instance, check the mojo
  descriptor's requiredConnectivity field.

  * If <<<(offline == true) && (requiresOnline != true)>>>, bind
    the mojo to the lifecycle.

    In this case, the client is <<offline>>, and the mojo does not require
    online status.

        Mojo mojo = new Mojo();
        new EnhancedComponentConfigurator().configureComponent(mojo, configuration, evaluator, null);

        assertEquals(
                Objects.equals(path.toUri().toString(), path.toUri().toASCIIString()), !Os.isFamily(Os.FAMILY_WINDOWS));
        assertEquals(mojo.uri, path.toUri());
        assertEquals(mojo.path, path);

import javax.inject.Singleton;

import java.util.List;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.lifecycle.LifecycleExecutionException;

/**
 * Default mojo execution strategy. It just iterates over mojo executions and runs one by one
 */
@Named
@Singleton
public class DefaultMojosExecutionStrategy implements MojosExecutionStrategy {
    @Override

/**
 * Extension point that allows build extensions observe and possibly veto mojo executions.
 * <p>
 * Unlike {@link org.apache.maven.execution.MojoExecutionListener}, this extension point does not
 * trigger instantiation of the component, hence "weak" class name prefix. Only applies to mojo execution
 * scoped components.
 * </p>

        msgs.add("*****************************************************************");
        msgs.add("* An aggregator Mojo is already executing in parallel build,    *");
        msgs.add("* but aggregator Mojos require exclusive access to reactor to   *");
        msgs.add("* prevent race conditions. This mojo execution will be blocked  *");
        msgs.add("* until the aggregator work is done.                            *");

                LifecycleMojo mojo = mojos.get(i);

                GoalSpec gs = parseGoalSpec(mojo.getGoal());

                if (gs == null) {
                    logger.warn(
                            "Ignored invalid goal specification '{}' from lifecycle mapping for phase {}",
                            mojo.getGoal(),
                            phase);
                    continue;

     *
     * @return the current project or {@code empty()} if not applicable
     */
    @Nonnull
    Optional<Project> getProject();

    /**
     * Gets the current mojo execution (if any).
     *
     * @return the current mojo execution or {@code empty()} if not applicable
     */
    @Nonnull
    Optional<MojoExecution> getMojoExecution();

    /**
     * Gets the exception that caused the event (if any).