* invoke methods, they invoke methods on the {@code ForwardingSortedMultiset}.
 *
 * <p>The {@code standard} methods and any collection views they return are not guaranteed to be
 * thread-safe, even when all of the methods that they depend on are thread-safe.
 *
 * @author Louis Wasserman
 * @since 15.0
 */
@GwtCompatible
public abstract class ForwardingSortedMultiset<E extends @Nullable Object>

import org.apache.commons.pool2.impl.DefaultPooledObject;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.fess.crawler.container.CrawlerContainer;

/**
 * A thread-safe factory for creating and managing pooled crawler objects.
 * This class extends {@link BasePooledObjectFactory} and provides
 * methods for creating, wrapping, and destroying crawler components

        l2.forEach(l1::putIfAbsent);
        return l1;
    }

    // gather artifactIds which are not unique so that the respective thread names can be extended with the groupId
    public Set<String> duplicateIds() {
        if (duplicateIds == null) {
            synchronized (this) {
                if (duplicateIds == null) {

     * Get the value for the key 'crawler.hotthread.threads'. <br>
     * The value is, e.g. 3 <br>
     * comment: Number of threads for hot thread monitoring.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerHotthreadThreads();

    /**
     * Get the value for the key 'crawler.hotthread.threads' as {@link Integer}. <br>

        buf.append(",\"service.name\":\"").append(ecsServiceName).append('"');
        buf.append(",\"event.dataset\":\"").append(ecsEventDataset).append('"');
        buf.append(",\"process.thread.name\":\"").append(StringEscapeUtils.escapeJson(Thread.currentThread().getName())).append('"');
        buf.append(",\"log.logger\":\"").append(StringEscapeUtils.escapeJson(this.getClass().getName())).append('"');
        valueMap.entrySet()

import java.util.concurrent.atomic.AtomicReference;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Simplified circuit breaker implementation for SMB operations.
 * Thread-safe and lock-free implementation to prevent cascading failures.
 *
 * Features:
 * - Simple state management (CLOSED, OPEN, HALF_OPEN)
 * - Lock-free atomic operations
 * - Configurable thresholds and timeouts

            throw new ExtractException(e);
        }
    }

    /**
     * Gets an XPathAPI instance from the cache for the current thread.
     *
     * @return the XPathAPI instance
     */
    protected XPathAPI getXPathAPI() {
        try {
            return xpathAPICache.get(Thread.currentThread().getName());
        } catch (final ExecutionException e) {
            if (logger.isDebugEnabled()) {

    @Min(value = 0)
    @Max(value = 9223372036854775807L)
    @ValidateTypeFailure
    public Long maxAccessCount;

    /** The number of threads to use for crawling (required, 1 to 2147483647). */
    @Required
    @Min(value = 1)
    @Max(value = 2147483647)
    @ValidateTypeFailure
    public Integer numOfThread;

    if (value != null) {
      return value;
    }

    // Store a local reference to the cache entry. If the backing map is immutable, this,
    // in combination with immutable cache entries, will ensure a thread-safe cache.
    CacheEntry<K, V> entry;

    // Check cache. We use == on purpose because it's cheaper and a cache miss is ok.
    entry = cacheEntry1;
    if (entry != null && entry.key == key) {

import java.util.logging.Level;
import java.util.logging.Logger;
import org.jspecify.annotations.NullMarked;

/**
 * A {@code TearDownStack} contains a stack of {@link TearDown} instances.
 *
 * <p>This class is thread-safe.
 *
 * @author Kevin Bourrillion
 * @since 10.0
 */
@GwtCompatible
@NullMarked
public class TearDownStack implements TearDownAccepter {