{* ../../docs_src/events/tutorial003_py39.py hl[1,13] *}

A **context manager** in Python is something that you can use in a `with` statement, for example, `open()` can be used as a context manager:

```Python
with open("file.txt") as file:
    file.read()
```

In recent versions of Python, there's also an **async context manager**. You would use it with `async with`:

```Python

            "uid": "${DS_PROMETHEUS}"
          },
          "exemplar": true,
          "expr": "minio_node_drive_used_bytes{job=~\"$scrape_jobs\",server=\"$server\"}",
          "interval": "",
          "legendFormat": "Used [{{drive}}]",
          "refId": "B"
        },
        {
          "datasource": {
            "type": "prometheus",
            "uid": "${DS_PROMETHEUS}"
          },
          "exemplar": true,

     */
    public OpenSearchAccessResultData() {
    }

    /**
     * Creates a new instance of OpenSearchAccessResultData from a source map.
     * This constructor is used when loading data from OpenSearch.
     *
     * @param src The source map containing the access result data fields.
     * @throws OpenSearchAccessException if the data cannot be decoded.
     */

    /** The name of the transformer associated with this access result data. */
    protected String transformerName;

    /** The data as a byte array. */
    protected byte[] data;

    /** The encoding used for the access result data. */
    protected String encoding;

    /**
     * Constructs a new AccessResultDataImpl instance.
     */
    public AccessResultDataImpl() {
        // NOP
    }

    @Override

import java.nio.charset.StandardCharsets;

import jcifs.Encodable;
import jcifs.internal.util.SMBUtil;

/**
 * File System Control Code (FSCC) request for pipe wait operations.
 * Implements the FSCTL_PIPE_WAIT control code used to wait for a named pipe
 * to become available when attempting to connect to a busy pipe.
 *
 * @author mbechler
 */
public class FsctlPipeWaitRequest implements Encodable {

    private final byte[] nameBytes;

     * <ul>
     * <li>use either / or \ file path separator</li>
     * <li>have .. parent directory references</li>
     * <li>point either at file or directory, in the latter case POM file name 'pom.xml' needs to be used by the
     * requested model source.</li>
     * </ul>
     *
     * @param relPath is the path of the requested model source relative to this model source POM.

        Charset charset = getTerminalCharset(terminal);
        return charset.newEncoder().canEncode(unicodeChar) ? String.valueOf(unicodeChar) : asciiFallback;
    }

    /**
     * Gets the charset used by the terminal for output.
     * Falls back to the system default charset if terminal charset is not available.
     *
     * @param terminal the terminal to get the charset from

import org.slf4j.LoggerFactory;

/**
 * Use an SLF4J {@link ILoggerFactory} as a backing for a Plexus
 * {@link LoggerManager},
 * ignoring Plexus logger API parts that are not classical and probably not really used.
 *
 * @since 3.1
 */
public class Slf4jLoggerManager implements LoggerManager {

    private final ILoggerFactory loggerFactory;

    public Slf4jLoggerManager() {

     * cache.
     *
     * @param project The project that employs the plugin realm, must not be {@code null}.
     * @param record The cache record being used for the project, must not be {@code null}.
     */
    void register(MavenProject project, Key key, CacheRecord record);

import jakarta.annotation.Resource;

/**
 * Service class for managing data configuration CRUD operations.
 * This service provides functionality to create, read, update, and delete
 * data configurations used by the Fess crawler system.
 *
 * <p>Data configurations define how the crawler should access and process
 * various data sources such as databases, CSV files, or other structured data.</p>
 */