.setCreate(true)
                    .setSource(source)
                    .execute()
                    .actionGet();
                count++;
                Thread.sleep(500);
            } catch(Exception e) {
                Logger.warn(e.getMessage(), e);
            }
        }
    }

 *
 * <p>As of Guava 23.0, this class is thread-safe and lock-free. It internally uses atomics and
 * compare-and-swap to ensure correctness when multiple threads are used to access it.
 *
 * @param <T> the type of instances that the {@code BloomFilter} accepts
 * @author Dimitris Andreou
 * @author Kevin Bourrillion
 * @since 11.0 (thread-safe since 23.0)
 */
@Beta
@ElementTypesAreNonnullByDefault

        final String value = params.get(key);
        if (value == null) {
            return key;
        }
        return value;
    }

    protected static class MonitorThread extends Thread {
        private final Process process;

        private final long timeout;

        private boolean finished = false;

        private boolean teminated = false;

    private static final String KEEP_EXPIRES_DOCS = "keep_expires_docs";

    protected long crawlingExecutionInterval = Constants.DEFAULT_CRAWLING_EXECUTION_INTERVAL;

    protected int crawlerPriority = Thread.NORM_PRIORITY;

    protected final List<DataCrawlingThread> dataCrawlingThreadList = Collections.synchronizedList(new ArrayList<>());

    public void crawl(final String sessionId) {

  private val forbiddenLocks = mutableListOf<Any>()

  /** The timestamp of the last taken event, used to measure elapsed time between events. */
  private var lastTimestampNs: Long? = null

  /** Confirm that the thread does not hold a lock on `lock` during the callback. */
  fun forbidLock(lock: Any) {
    forbiddenLocks.add(lock)
  }

  /**

 * contract.
 *
 * <p>The {@code standard} methods and the 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 12.0
 */
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingNavigableSet<E extends @Nullable Object>

        cli.initialize(request);
        cli.cli(request);
        assertEquals("multithreaded", request.commandLine.getOptionValue(CLIManager.BUILDER));
        assertEquals("8", request.commandLine.getOptionValue(CLIManager.THREADS));

        // override from command line
        request = new CliRequest(new String[] {"--builder", "foobar"}, null);
        cli.cli(request);

import org.apache.maven.wagon.providers.file.FileWagon;
import org.apache.maven.wagon.resource.Resource;

/**
 * Wagon used for test cases that annotate some methods. Note that this is not a thread-safe implementation.
 */
public class TestFileWagon extends FileWagon {
    private TestTransferListener testTransferListener;
    private boolean insideGet;

    @Deprecated

    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) {

    protected IntervalController intervalController;

    protected Set<String> robotsTxtUrlSet = new LruHashSet<>(10000);

    protected ThreadLocal<String[]> sitemapsLocal = new ThreadLocal<>();

    /** The number of a thread */
    protected int numOfThread = 10;

    protected int maxThreadCheckCount = 20;

    /** a max depth for crawling. -1 is no depth check. */
    protected int maxDepth = -1;