assertEquals(1, events.size());
        assertEquals("listener1", events.get(0));

        // Switch to listener2
        factory.setOnDestroyListener(listener2);
        assertEquals(listener2, factory.getOnDestroyListener());
        factory.destroyObject(pooledObject);
        assertEquals(2, events.size());
        assertEquals("listener2", events.get(1));

        // Clear listener

import org.codelibs.fess.crawler.log.LogType;

/**
 * Implementation of the {@link LogHelper} interface.
 * This class provides methods for logging various events during the crawling process.
 * It uses Log4j2 for logging.
 *
 * <p>
 * The class contains methods for logging different types of events, such as:
 * </p>
 * <ul>
 *   <li>Starting and finishing threads</li>
 *   <li>Starting and cleaning up crawling</li>

import org.codelibs.core.timer.TimeoutTarget;

/**
 * HcConnectionMonitorTarget is responsible for monitoring and managing HTTP client connections.
 * It implements the TimeoutTarget interface to handle connection expiration events.
 *
 * <p>This class uses an instance of HttpClientConnectionManager to manage the connections.
 * It closes expired connections and idle connections that have exceeded a specified timeout.
 * </p>
 *

        if (onDestroyListener != null) {
            onDestroyListener.onDestroy(p);
        }
    }

    /**
     * Listener interface for handling object destruction events.
     * @param <T> The type of the pooled object
     */
    public interface OnDestroyListener<T> {
        /**
         * Called when a pooled object is being destroyed.

     */
    protected Client client;

    /**
     * The address of the OpenSearch instance.
     */
    protected String address;

    /**
     * List of listeners for connection events.
     */
    protected List<OnConnectListener> onConnectListenerList = new ArrayList<>();

    /**
     * Flag indicating whether the client is connected.
     */
    private volatile boolean connected;

)(?:\.(.+)|)$/;function Z(){return!0}function $(){return!1}function _(){try{return l.activeElement}catch(a){}}n.event={global:{},add:function(a,b,c,d,e){var f,g,h,i,j,k,l,m,o,p,q,r=L.get(a);if(r){c.handler&&(f=c,c=f.handler,e=f.selector),c.guid||(c.guid=n.guid++),(i=r.events)||(i=r.events={}),(g=r.handle)||(g=r.handle=function(b){return typeof n!==U&&n.event.triggered!==b.type?n.event.dispatch.apply(a,arguments):void 0}),b=(b||"").match(E)||[""],j=b.length;while(j--)h=Y.exec(b[j])||[],o=q=h[1],p...

     */
    public void setRequestListener(final RequestListener listener) {
        this.listener = listener;
    }

    /**
     * Interface for listening to request lifecycle events.
     */
    public interface RequestListener {

        /**
         * Called when a request starts.
         *
         * @param client the fault-tolerant client

				"audio/t140c",
				"audio/t38",
				"audio/telephone-event",
				"audio/tone",
				"audio/ulpfec",
				"audio/vdvi",
				"audio/vmr-wb",
				"audio/vnd.3gpp.iufp",
				"audio/vnd.4sb",
				"audio/vnd.audiokoz",
				"audio/vnd.adobe.soundbooth",
				"audio/vnd.celp",
				"audio/vnd.cisco.nse",
				"audio/vnd.cmles.radio-events",
				"audio/vnd.cns.anp1",
				"audio/vnd.cns.inf1",

 */
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,

      appropriateness of using or redistributing the Work and assume any
      risks associated with Your exercise of permissions under this License.

   8. Limitation of Liability. In no event and under no legal theory,
      whether in tort (including negligence), contract, or otherwise,
      unless required by applicable law (such as deliberate and grossly