import org.apache.maven.cling.invoker.mvn.MavenInvoker;

/**
 * Resident invoker implementation, specialization of Maven Invoker, but keeps Maven instance resident. This implies, that
 * things like environment, system properties, extensions etc. are loaded only once. It is caller duty to ensure
 * that subsequent call is right for the resident instance (ie no env change or different extension needed).

 * </ul>
 *
 * There is one specialization of {@link org.apache.maven.cling.invoker.mvn.MavenInvoker}, the "resident"
 * {@link org.apache.maven.cling.invoker.mvn.resident.ResidentMavenInvoker}. The difference is that this invoker
 * will on close "clean up" (tear down) the instance. All invokers are re-entrant.
 */

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.cling.invoker.mvn.resident;

import java.nio.file.FileSystem;
import java.nio.file.Path;
import java.util.List;

import com.google.common.jimfs.Configuration;
import com.google.common.jimfs.Jimfs;
import org.apache.maven.api.cli.Invoker;

/**
 * MetadataGraph node - as it's a directed graph - holds adjacency lists for incident and exident nodes
 *
 *
 */
@Deprecated
public class MetadataGraphNode {
    /** node payload */
    MavenArtifactMetadata metadata;

    /** nodes, incident to this (depend on me) */
    List<MetadataGraphNode> inNodes;

    /** nodes, exident to this (I depend on) */
    List<MetadataGraphNode> exNodes;

    /**
     * Function code for server-side copy chunk write operation
     */
    public static final int FSCTL_SRV_COPYCHUNK_WRITE = 0x001480F2;
    /**
     * Function code to request resilient handle for network failures
     */
    public static final int FSCTL_LRM_REQUEST_RESILENCY = 0x001401D4;
    /**
     * Function code to query network interface information
     */

![Events Diagram](../assets/images/******@****.***)

### Events with Retries and Follow-Ups

The benefit of raising an exception over returning a value will be more evident in the section about Dependencies and Security.

In this example, when the client requests an item by an ID that doesn't exist, raise an exception with a status code of `404`: