*/
public interface AccessResultCallback<RESULT extends AccessResult<?>> {
    /**
     * Processes the given access result.
     *
     * @param accessResult the result of the access operation to be processed
     */
    /**
     * Processes the given access result.
     *
     * @param accessResult the result of the access operation to be processed
     */
    void iterate(RESULT accessResult);

        }

        /**
         * Executes the crawling thread.
         * Sets the running flag, processes the data store, and ensures
         * proper cleanup regardless of success or failure.
         */
        @Override
        public void run() {
            running = true;
            try {
                process();
            } finally {
                running = false;
                finished = true;

package org.codelibs.fess.crawler.log;

/**
 * LogType defines the different types of log messages that can be generated during the crawling process.
 * Each enum constant represents a specific event or state in the crawler's execution.
 */
public enum LogType {
    /** Indicates the start of a crawling process. */
    START_CRAWLING,
    /** Indicates the cleanup phase of crawling. */
    CLEANUP_CRAWLING,

     * When true, the builder will process parent POMs and child modules as needed.
     *
     * @return true if the build should be recursive, false otherwise
     */
    boolean isRecursive();

    /**
     * Determines whether plugins should be processed during project building.
     * When true, the builder will process plugin information which may include

        if (logHelper != null) {
            logHelper.log(key, objs);
        }
    }

    /**
     * Runs the crawling process in a separate thread.
     * This method fetches URLs from the queue, accesses content, processes responses,
     * and extracts child URLs until the crawling process is done or no more URLs are available.
     */
    @Override
    public void run() {

    /**
     * Constructs a new SSO process exception with the specified detailed message.
     *
     * @param message The detailed error message explaining the cause of the exception
     */
    public SsoProcessException(final String message) {
        super(message);
    }

    /**
     * Constructs a new SSO process exception with the specified detailed message and cause.
     *

        /** Indicates that a URL was prepared for crawling. */
        PREPARED,
        /** Indicates that a URL redirect was encountered. */
        REDIRECTED,
        /** Indicates that a URL was processed completely. */
        PROCESSED
    }

Esta é a ideia básica. Mas você provavelmente vai querer cuidar de algumas coisas adicionais, como:

* Segurança - HTTPS
* Executando na inicialização
* Reinicializações
* Replicação (o número de processos em execução)
* Memória
* Passos anteriores antes de começar

    protected String defaultField = null;

    /**
     * Constructs a new QueryContext with the specified query string.
     * Processes special query prefixes (allinurl:, allintitle:) and initializes
     * request-scoped attributes for highlighting and field logging.
     * @param queryString The query string to process.
     * @param isQuery Whether this is a search query (enables highlighting and logging).
     */
    @SuppressWarnings("unchecked")

        if (available()) {
            process.run();
        } else {
            initProcesses.add(process);
        }
    }

    /**
     * Executes all initialization processes.
     * @param action The action to perform on each initialization process.
     */
    public static void doInitProcesses(final Consumer<? super Runnable> action) {
        try {