# OPA Quickstart Guide [![Slack](https://slack.minio.io/slack?type=svg)](https://slack.minio.io)

OPA is a lightweight general-purpose policy engine that can be co-located with MinIO server, in this document we talk about how to use OPA HTTP API to authorize requests. It can be used with any type of credentials (STS based like OpenID or LDAP, regular IAM users or service accounts).

OPA is enabled through MinIO's Access Management Plugin feature.

## Get started

 *
 * <p>{@link org.apache.maven.api.DependencyCoordinates} instances represent a dependency element in a POM.
 * A {@code DependencyCoordinates} extends {@code ArtifactCoordinates} with additional information about how
 * the artifact will be used: type, scope and obligation (whether the dependency is optional or mandatory).
 * The version and the obligation may not be defined precisely.</p>
 *

import jcifs.internal.smb2.ServerMessageBlock2Response;
import jcifs.internal.util.SMBUtil;
import jcifs.smb.NtStatus;

/**
 * SMB2 Change Notify response message.
 *
 * This response contains information about file system changes
 * that occurred in the monitored directory.
 *
 * @author mbechler
 */
public class Smb2ChangeNotifyResponse extends ServerMessageBlock2Response implements NotifyResponse {

        tester.numCallsToVerify,
        tester.numCallsToNewTargetIterator * STEPS);
  }

  public void testVerifyCanThrowAssertionThatFailsTest() {
    String message = "Important info about why verify failed";
    IteratorTester<Integer> tester =
        new IteratorTester<Integer>(
            1, MODIFIABLE, newArrayList(1, 2, 3), IteratorTester.KnownOrder.KNOWN_ORDER) {
          @Override

import org.apache.maven.api.annotations.Immutable;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;

/**
 * {@code ArtifactCoordinates} completed with information about how the artifact will be used.
 * This information includes the dependency type (main classes, test classes, <i>etc.</i>),
 * a scope (compile, runtime <i>etc.</i>), an obligation (whether the dependency

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.metadata.RepositoryMetadataStoreException;

/**
 * Contains metadata about an artifact, and methods to retrieve/store it from an artifact repository.
 * TODO merge with artifactmetadatasource
 * TODO retrieval exception not appropriate for store
 *
 */
public interface ArtifactMetadata {
    /**

import java.util.Map;

/**
 * Type safe enumeration for the artifact status field.
 *
 */
@Deprecated
public final class ArtifactStatus implements Comparable<ArtifactStatus> {
    /**
     * No trust - no information about status.
     */
    public static final ArtifactStatus NONE = new ArtifactStatus("none", 0);

    /**
     * No trust - information was generated with defaults.
     */

import jcifs.smb1.smb1.SecurityDescriptor;

/**
 * MS-RPC share information retrieval operation.
 *
 * This class implements the Server Service (SRVSVC) ShareGetInfo operation
 * for retrieving detailed information about a network share, including
 * security descriptors.
 */
public class MsrpcShareGetInfo extends srvsvc.ShareGetInfo {

    /**
     * Creates a new request to get share information.
     *

NOTE:

- `timeToFirstByte` and `timeToResponse` will be expressed in Nanoseconds.
- Additionally in the case of the erasure coded setup `tags.objectLocation` provides per object details about
  - Pool number the object operation was performed on.
  - Set number the object operation was performed on.
  - The list of drives participating in this operation belong to the set.

```json
{
  "version": "1",

 * {@link MapIteratorCache}, this structure caches values for the two most recently retrieved keys.
 *
 * @author James Sexton
 */
final class MapRetrievalCache<K, V> extends MapIteratorCache<K, V> {
  // See the note about volatile in the superclass.
  private transient volatile @Nullable CacheEntry<K, V> cacheEntry1;
  private transient volatile @Nullable CacheEntry<K, V> cacheEntry2;

  MapRetrievalCache(Map<K, V> backingMap) {