* <p>
 * This package contains the data model classes that represent the structure of Maven POM files.
 * These classes are immutable to ensure thread safety and prevent unintended modifications.
 * The root class is {@link org.apache.maven.api.model.Model}, which represents the entire POM.
 * <p>
 * Key components include:
 * <ul>

        this.lock = new ReentrantReadWriteLock();

        // Start cleanup executor for expired leases
        this.cleanupExecutor = Executors.newSingleThreadScheduledExecutor(r -> {
            Thread t = new Thread(r, "LeaseManager-Cleanup");
            t.setDaemon(true);
            return t;
        });

        // Schedule periodic cleanup
        long cleanupInterval = context.getConfig().getLeaseTimeout();

 * evicted or manually invalidated. The common way to build instances is using {@link CacheBuilder}.
 *
 * <p>Implementations of this interface are expected to be thread-safe, and can be safely accessed
 * by multiple concurrent threads.
 *
 * @param <K> the type of the cache's keys, which are not permitted to be null
 * @param <V> the type of the cache's values, which are not permitted to be null
 * @author Charles Fry

 * possibly run in another thread. That cause should itself be an {@code Error}; if not, use {@code
 * ExecutionException} or {@link UncheckedExecutionException}. This allows the client code to
 * continue to distinguish between exceptions and errors, even when they come from other threads.
 *
 * @author Chris Povirk
 * @since 10.0
 */
@GwtCompatible

 * 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) {

        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()) {