@Override public void onMessage(WebSocket webSocket, String text) {
    System.out.println("MESSAGE: " + text);
  }

  @Override public void onMessage(WebSocket webSocket, ByteString bytes) {
    System.out.println("MESSAGE: " + bytes.hex());
  }

  @Override public void onClosing(WebSocket webSocket, int code, String reason) {
    webSocket.close(1000, null);
    System.out.println("CLOSE: " + code + " " + reason);
  }

        assertNotNull(thumbnailManager.thumbnailTaskQueue);
    }

    // Test initialization with system property
    public void test_init_withSystemProperty() {
        File customDir = new File(tempDir, "custom");
        System.setProperty(Constants.FESS_THUMBNAIL_PATH, customDir.getAbsolutePath());
        try {
            ThumbnailManager manager = new ThumbnailManager() {

import jakarta.validation.constraints.Min;
import jakarta.validation.constraints.Size;

/**
 * Form class for editing general system settings in the admin interface.
 * This form handles global configuration settings that affect the entire Fess system,
 * including crawling behavior, authentication, logging, and various system parameters.
 *
 */
public class EditForm {

    /**
     * Creates a new EditForm instance.
     */

    if (future.isDone()) {
      return;
    }
    long timeoutSeconds = timeoutSeconds();
    long deadline = System.nanoTime() + SECONDS.toNanos(timeoutSeconds);
    do {
      System.runFinalization();
      if (future.isDone()) {
        return;
      }
      System.gc();
      try {
        future.get(1L, SECONDS);
        return;
      } catch (CancellationException | ExecutionException ok) {

        try {
            parser.parseArgument(args);
        } catch (final CmdLineException e) {
            System.err.println(e.getMessage());
            System.err.println("java " + ThumbnailGenerator.class.getCanonicalName() + " [options...] arguments...");
            parser.printUsage(System.err);
            return;
        }

        if (logger.isDebugEnabled()) {
            try {

            if (is != null) {
                Properties props = new Properties();
                props.load(is);
                props.forEach((key, value) -> setProperty(String.valueOf(key), String.valueOf(value)));
                logger.debug("Loaded test system properties");
            } else {

        long start = System.currentTimeMillis();
        for (int i = 0; i < num; i++) {
            System.out.println("test" + i);
        }
        final long sysout = System.currentTimeMillis() - start;
        start = System.currentTimeMillis();
        for (int i = 0; i < num; i++) {
            logger.fatal("test" + i);
        }
        final long logger = System.currentTimeMillis() - start;

     */
    public boolean isAuthenticationError() {
        return errorCode.getCategory() == ErrorCategory.AUTHENTICATION;
    }

    /**
     * Check if this is a file system error
     *
     * @return true if file system error
     */
    public boolean isFileSystemError() {
        return errorCode.getCategory() == ErrorCategory.FILE_SYSTEM;
    }

    /**
     * Check if this is a transient error

        pos += 4;

        // Write payload data: input then output
        if (inputCount > 0 && inputBytes != null) {
            System.arraycopy(inputBytes, 0, buf, pos, inputCount);
            pos += inputCount;
        }
        if (outputCount > 0 && outputBytes != null) {
            System.arraycopy(outputBytes, 0, buf, pos, outputCount);
        }
        return buf;
    }

## **FastAPI** compatibility { #fastapi-compatibility }

The simplicity of the dependency injection system makes **FastAPI** compatible with:

* all the relational databases
* NoSQL databases
* external packages
* external APIs
* authentication and authorization systems
* API usage monitoring systems
* response data injection systems
* etc.

## Simple and Powerful { #simple-and-powerful }