this.logger = logger;
    }

    public void testArtifact(Artifact node) {}

    public void startProcessChildren(Artifact artifact) {
        indent += "  ";
    }

    public void endProcessChildren(Artifact artifact) {
        indent = indent.substring(2);
    }

    public void includeArtifact(Artifact artifact) {

    }

    public ExecutionEventLogger(MessageBuilderFactory messageBuilderFactory, Logger logger) {
        this(messageBuilderFactory, logger, -1);
    }

    public ExecutionEventLogger(MessageBuilderFactory messageBuilderFactory, Logger logger, int terminalWidth) {
        this.logger = Objects.requireNonNull(logger, "logger cannot be null");
        this.messageBuilderFactory = messageBuilderFactory;

import org.slf4j.Logger;

/**
 */
class LoggingRepositoryListener extends AbstractRepositoryListener {

    private final Logger logger;

    LoggingRepositoryListener(Logger logger) {
        this.logger = logger;
    }

    @Override
    public void artifactInstalling(RepositoryEvent event) {

import org.apache.maven.api.plugin.Log;
import org.slf4j.Logger;

import static java.util.Objects.requireNonNull;

public class DefaultLog implements Log {
    private final Logger logger;

    public DefaultLog(Logger logger) {
        this.logger = requireNonNull(logger);
    }

    public void debug(CharSequence content) {
        if (isDebugEnabled()) {
            logger.debug(toString(content));
        }
    }

        // verify
        InOrder inOrder = inOrder(logger);
        inOrder.verify(logger).info("");
        inOrder.verify(logger).info("------------------< org.apache.maven:maven-embedder >-------------------");
        inOrder.verify(logger).info("Building Apache Maven Embedder 3.5.4-SNAPSHOT");
        inOrder.verify(logger).info(adaptDirSeparator("  from maven-embedder/pom.xml"));

@Named
@Singleton
public class DefaultLifecycles {
    public static final String[] STANDARD_LIFECYCLES = {"clean", "default", "site"};

    private final Logger logger = LoggerFactory.getLogger(getClass());

    // @Configuration(source="org/apache/maven/lifecycle/lifecycles.xml")

    private final Lookup lookup;

    private final LifecycleRegistry registry;

        }

        if (u == null) {
            logger.warn("Ignored child URL: {} in {}", attrValue, url);
            return;
        }

        if (logger.isDebugEnabled()) {
            logger.debug("{} -> {}", attrValue, u);
        }
        if (StringUtil.isNotBlank(u)) {
            if (logger.isDebugEnabled()) {
                logger.debug("Add Child: {}", u);
            }

        loggerFactory = LoggerFactory.getILoggerFactory();
    }

    public Logger getLoggerForComponent(String role) {
        return new Slf4jLogger(loggerFactory.getLogger(role));
    }

    /**
     * The logger name for a component with a non-null hint is <code>role.hint</code>.
     * <b>Warning</b>: this does not conform to logger name as class name convention.

+-----+

* Logger Name

 Logger name is basically the classical fully qualified class name: it's not visible by default, but can be activated (see {{{/maven-logging.html}user documentation}}).

 Notice that before Maven 3.1.0, with logger created by Maven, some code used to pass logger from class to class because it could not create a new logger:

        R invokerRequest = context.invokerRequest;
        Logger logger = context.logger;
        if (invokerRequest.options().relaxedChecksums().orElse(false)) {
            logger.info("Disabling strict checksum verification on all artifact downloads.");
        } else if (invokerRequest.options().strictChecksums().orElse(false)) {
            logger.info("Enabling strict checksum verification on all artifact downloads.");
        }