}

    // Test offer with valid generator
    @Test
    public void test_offer_withValidGenerator() {
        TestThumbnailGenerator generator = new TestThumbnailGenerator();
        generator.available = true;
        generator.target = true;
        generator.task = new Tuple3<>("generator1", "docid1", "path1");
        thumbnailManager.add(generator);

        Map<String, Object> docMap = new HashMap<>();

        final CommandGenerator generator1 = new CommandGenerator();
        final CommandGenerator generator2 = new CommandGenerator();

        generator1.setCommandList(Collections.singletonList("echo test1"));
        generator2.setCommandList(Collections.singletonList("echo test2"));

        generator1.setCommandTimeout(1000L);
        generator2.setCommandTimeout(2000L);

        ThumbnailGenerator generator = new ThumbnailGenerator();
        assertNull(generator.searchEngineClient);

        // After proper initialization, it should be injected
        SearchEngineClient mockClient = new SearchEngineClient() {
            // Mock implementation
        };
        generator.searchEngineClient = mockClient;
        assertEquals(mockClient, generator.searchEngineClient);
    }

    /**
     * Default constructor for ThumbnailGenerator.
     */
    public ThumbnailGenerator() {
        // Default constructor
    }

    /**
     * Command-line options for the thumbnail generator.
     */
    protected static class Options {
        /**
         * Session ID for filtering thumbnail generation.
         */

{"index":{"_index":"fess_config.scheduled_job","_id":"thumbnail_generate"}}

- Documentation files, where applicable (e.g., `.adoc`, `.md`).

#### Exempt Files for Copyright Headers:

- Scripts critical to builds, CI, or deployment (e.g., `.kts`, `.groovy`).
- Auto-generated files (e.g., by code generators).
- Minor configuration files (e.g., `.gitignore`).
- Documentation samples and code snippets (e.g., `.java`, `.kt`, `.groovy`, `.kts`).
- Release notes (e.g., `.md`).
- READMEs (e.g., `.md`).

thumbnail.html.image.xpath=//IMG
# File extensions to exclude from thumbnail generation.
thumbnail.html.image.exclude.extensions=svg,html,css,js
# Interval for thumbnail generator.
thumbnail.generator.interval=0
# Targets for thumbnail generator (e.g., all).
thumbnail.generator.targets=all
# Whether the thumbnail crawler is enabled.
thumbnail.crawler.enabled=true
# Interval for system monitor in thumbnail processing.

        INGEST("fess-ingest"), //
        /** Script plugins */
        SCRIPT("fess-script"), //
        /** Web application plugins */
        WEBAPP("fess-webapp"), //
        /** Thumbnail generator plugins */
        THUMBNAIL("fess-thumbnail"), //
        /** Crawler plugins */
        CRAWLER("fess-crawler"), //
        /** LLM plugins */
        LLM("fess-llm"), //
        /** Unknown/generic JAR files */

    /**
     * Get the value for the key 'thumbnail.generator.interval'. <br>
     * The value is, e.g. 0 <br>
     * comment: Interval for thumbnail generator.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getThumbnailGeneratorInterval();

    /**
     * Get the value for the key 'thumbnail.generator.interval' as {@link Integer}. <br>