thumbnailManager = new TestThumbnailManager();
        thumbnailManager.baseDir = tempDir;
        thumbnailManager.thumbnailTaskQueue = new LinkedBlockingQueue<>(100);
        thumbnailManager.generating = false;
    }

    // Test implementation of ThumbnailManager to avoid container dependencies
    private class TestThumbnailManager extends ThumbnailManager {
        @Override
        public void init() {

# Generating SDKs { #generating-sdks }

Because **FastAPI** is based on the **OpenAPI** specification, its APIs can be described in a standard format that many tools understand.

This makes it easy to generate up-to-date **documentation**, client libraries (<abbr title="Software Development Kits">**SDKs**</abbr>) in multiple languages, and **testing** or **automation workflows** that stay in sync with your code.

    /**
     * Queue for thumbnail generation tasks containing URL, content, and path tuples.
     */
    protected BlockingQueue<Tuple3<String, String, String>> thumbnailTaskQueue;

    /**
     * Flag indicating whether thumbnail generation is currently in progress.
     */
    protected volatile boolean generating;

    private Thread thumbnailQueueThread;

    /**

    private int updates;
    private int signSequence;

    /**
     * Constructs a signing digest with bypass option
     *
     * @param macSigningKey
     *            The MAC signing key used for generating signatures
     * @param bypass
     *            Whether to bypass signature verification
     */
    public SMB1SigningDigest(final byte[] macSigningKey, final boolean bypass) {
        this(macSigningKey, bypass, 0);

Use the following command to generate a private key with RSA:

```sh
openssl genrsa -out private.key 2048
```

A response similar to this one should be displayed:

```
Generating RSA private key, 2048 bit long modulus
............................................+++
...........+++
e is 65537 (0x10001)
```

Taking data from:

* The path as parameters.
* Headers.
* Cookies.
* etc.

And by doing so, **FastAPI** is validating that data, converting it and generating documentation for your API automatically.

But there are situations where you might need to access the `Request` object directly.

## Details about the `Request` object { #details-about-the-request-object }

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.exception.IORuntimeException;
import org.codelibs.fess.Constants;

/**
 * Utility class for generating and writing thread dumps.
 * Provides methods to capture thread information for debugging purposes.
 */
public class ThreadDumpUtil {
    private static final Logger logger = LogManager.getLogger(ThreadDumpUtil.class);

            if (fessConfig.isThumbnailEnabled()) {
                thumbnailManager.offer(doc);
            }
            // 404
            throw responseManager.new404("Thumbnail for " + form.docId + " is under generating.");
        }

        return asStream(form.docId).contentType(getImageMimeType(thumbnailFile)).stream(out -> {
            try (BufferedInputStream in = new BufferedInputStream(new FileInputStream(thumbnailFile))) {

import org.opensearch.monitor.os.OsProbe;
import org.opensearch.monitor.process.ProcessProbe;

import jakarta.annotation.Resource;

/**
 * Executable class for generating thumbnails for indexed documents.
 * This class provides a command-line interface for thumbnail generation tasks.
 */
public class ThumbnailGenerator {

    private static final Logger logger = LogManager.getLogger(ThumbnailGenerator.class);

    /**

import org.codelibs.fess.util.JobProcess;
import org.codelibs.fess.util.ResourceUtil;
import org.codelibs.fess.util.SystemUtil;

import jakarta.servlet.ServletContext;

/**
 * Job class for generating thumbnails for documents in the search engine.
 * This job executes the ThumbnailGenerator process as a separate JVM process
 * to create thumbnail images for supported document types.
 */