import java.util.List;
import java.util.Objects;
import java.util.Properties;

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.model.Profile;
import org.apache.maven.model.building.ModelBuildingRequest;
import org.apache.maven.properties.internal.SystemProperties;
import org.eclipse.aether.RepositorySystemSession;

/**
 * DefaultProjectBuildingRequest
 *

 4. If it's a new route, it connects by building either a direct socket connection, a TLS tunnel (for HTTPS over an HTTP proxy), or a direct TLS connection. It does TLS handshakes as necessary. This step may be retried for tunnel challenges and TLS handshake failures.

### Essential Files

| File | Purpose |
|------|---------|
| `Suggester.java` | Main entry point, index management |
| `SuggestIndexer.java` | Indexing operations |
| `SuggestRequest.java` | Query building, scoring |
| `SuggestSettings.java` | Configuration |
| `SuggestItem.java` | Domain model |
| `DefaultContentsParser.java` | Text processing pipeline |

### Key Constants

```java

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import org.apache.maven.api.annotations.NotThreadSafe;
import org.apache.maven.api.annotations.Nullable;

import static java.util.Objects.requireNonNull;

/**
 * Collects settings that control the building of effective settings.
 */
@Experimental
@Immutable
public interface SettingsBuilderRequest extends Request<ProtoSession> {

    /**
     * Gets the installation settings source.
     *

 * @see DependencyResolver#resolve(DependencyResolverRequest)
 */
@Experimental
public interface DependencyResolverResult extends Result<DependencyResolverRequest> {

    /**
     * Gets the exceptions that occurred while building the dependency graph.
     *
     * @return the exceptions that occurred, never {@code null}
     */
    @Nonnull
    List<Exception> getExceptions();

    /**
     * Gets the root node of the dependency graph.

      }
    }
  };

  ...
}
```

### Events with Failures

When an operation fails, a failure method is called. This is `connectFailed()` for failures while building a connection to the server, and `callFailed()` when the HTTP call fails permanently. When a failure happens it is possible that a `start` event won’t have a corresponding `end` event.

     *
     * @param validationLevel The level of validation to perform on processed models, e.g.
     *            {@link org.apache.maven.model.building.ModelBuildingRequest#VALIDATION_LEVEL_STRICT}.
     * @return This configuration, never {@code null}.
     */
    ProjectBuildingRequest setValidationLevel(int validationLevel);

    /**

import java.util.function.Predicate;

import org.apache.maven.api.services.model.ModelProcessor;
import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.model.Plugin;
import org.apache.maven.model.building.ModelProblem;
import org.apache.maven.plugin.PluginManagerException;
import org.apache.maven.plugin.PluginResolutionException;
import org.apache.maven.project.MavenProject;

        return style(style).a(message).resetStyle();
    }

    MessageBuilder style(String style);

    MessageBuilder resetStyle();

    //
    // message building methods modelled after Ansi methods
    //

    @Nonnull
    @Override
    MessageBuilder append(CharSequence cs);

    @Nonnull
    @Override