protected abstract void doSend( Request request ) throws IOException;
    protected abstract void doRecv( Response response ) throws IOException;
    protected abstract void doSkip() throws IOException;

    public synchronized void sendrecv( Request request,
                    Response response,
                    long timeout ) throws IOException {
            makeKey( request );
            response.isReceived = false;
            try {

    void finalizeConfiguration(Gradle gradle);

    /**
     * Synchronizes the property values of the provided cache configurations with those of this cache configuration
     * by setting the provided configuration's properties to be backed by the properties of this configuration.
     */
    void synchronize(CacheConfigurationsInternal cacheConfigurationsInternal);

            bus.handleSubscriberException(e.getCause(), context(event));
          }
        });
  }

  /**
   * Invokes the subscriber method. This method can be overridden to make the invocation
   * synchronized.
   */
  @VisibleForTesting
  void invokeSubscriberMethod(Object event) throws InvocationTargetException {
    try {
      method.invoke(target, checkNotNull(event));
    } catch (IllegalArgumentException e) {

            bus.handleSubscriberException(e.getCause(), context(event));
          }
        });
  }

  /**
   * Invokes the subscriber method. This method can be overridden to make the invocation
   * synchronized.
   */
  @VisibleForTesting
  void invokeSubscriberMethod(Object event) throws InvocationTargetException {
    try {
      method.invoke(target, checkNotNull(event));
    } catch (IllegalArgumentException e) {

import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.Supplier;

/**
 * Synchronizes access to some resource, by making sure that 2 threads do not try to produce it at the same time.
 * The resource to be accessed is represented by a key, and the factory is whatever needs to be done to produce it.

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

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * Connection decorator that synchronizes dispatching and always flushes after each message.
 *
 * The plan is to replace this with a Connection implementation that queues outgoing messages and dispatches them from a worker thread.
 */

                // we are in the transport thread, ie. on idle disconnecting
                // this is synchronous operation
                // This does not handle compound requests
                synchronized ( this.inLock ) {
                    Long peekKey = peekKey();
                    if ( peekKey == firstKey ) {
                        doRecv(response);
                        response.received();

//
// In the terminology of [the Go memory model],
// the n'th call to [RWMutex.Unlock] “synchronizes before” the m'th call to Lock
// for any n < m, just as for [Mutex].
// For any call to RLock, there exists an n such that
// the n'th call to Unlock “synchronizes before” that call to RLock,
// and the corresponding call to [RWMutex.RUnlock] “synchronizes before”
// the n+1'th call to Lock.
//
// [the Go memory model]: https://go.dev/ref/mem

            if (name.startsWith(concurrentPackage)
                // Use other classloader for ListenableFuture, so that the objects can interact
                && !ListenableFuture.class.getName().equals(name)) {
              synchronized (loadedClasses) {
                Class<?> toReturn = loadedClasses.get(name);
                if (toReturn == null) {
                  toReturn = super.findClass(name);
                  loadedClasses.put(name, toReturn);

     */
    WorkResult copy(Action<? super CopySpec> action);

    /**
     * Synchronizes the contents of a destination directory with some source directories and files.
     * The given action is used to configure a {@link CopySpec}, which is then used to synchronize the files.
     *
     * @param action action Action to configure the CopySpec.