// Access is synchronized internally in the actual implementation
                        // Here we just verify no concurrent modification exceptions occur
                        String url = "http://example.com/thread" + threadIndex + "/doc" + j;
                        // Simulate the synchronized access that happens in deleteDocument()
                        synchronized (mockCallback) {

    }

    @Override
    public void onSuccess(String result) {
      synchronized (monitor) {
        assertFalse(wasCalled);
        wasCalled = true;
        assertThat(result).isEqualTo(value);
      }
    }

    @Override
    public synchronized void onFailure(Throwable t) {
      synchronized (monitor) {
        assertFalse(wasCalled);
        wasCalled = true;

package com.google.common.collect;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.truth.Truth.assertThat;

import com.google.common.collect.Synchronized.SynchronizedCollection;
import com.google.common.collect.Synchronized.SynchronizedSet;
import com.google.common.testing.SerializableTester;
import java.io.Serializable;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

   * execution of tasks will stop until a call to this method is made.
   */
  @Override
  public void execute(Runnable task) {
    checkNotNull(task);
    Runnable submittedTask;
    long oldRunCount;
    synchronized (queue) {
      // If the worker is already running (or execute() on the delegate returned successfully, and
      // the worker has yet to start) then we don't need to start the worker.

    enqueueHelper(event, label);
  }

  private void enqueueHelper(Event<L> event, Object label) {
    checkNotNull(event, "event");
    checkNotNull(label, "label");
    synchronized (listeners) {
      for (PerListenerQueue<L> queue : listeners) {
        queue.add(event, label);
      }
    }
  }

  /**

  @Override
  public void publish(@Nullable LogRecord record) {
    synchronized (lock) {
      if (record != null) {
        list.add(record);
      }
    }
  }

  @Override
  public void flush() {}

  @Override
  public void close() {}

  public void clear() {
    synchronized (lock) {
      list.clear();
    }
  }

  /** Returns a snapshot of the logged records. */

        }
      }
    }

    synchronized void write(int b) throws IOException {
      update(1);
      out.write(b);
    }

    synchronized void write(byte[] b, int off, int len) throws IOException {
      update(len);
      out.write(b, off, len);
    }

    synchronized void close() throws IOException {
      out.close();
    }

    synchronized void flush() throws IOException {

  }

  /** Set the OAuth session for this client. */
  public synchronized void initOauthSession(OAuthSession session) {
    this.session = session;
    this.notifyAll();
  }

  /** Waits for an OAuth session for this client to be set. */
  public synchronized void awaitAccessToken(Timeout timeout) throws InterruptedIOException {
    while (session == null) {

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

            }
        }
        obj = getCachedAddress(name);
        if (obj == null) {
            synchronized (this.inFlightLookups) {
                this.inFlightLookups.add(name);
            }
        }

        return obj;
    }

    private void updateLookupTable(final Name name) {
        synchronized (this.inFlightLookups) {
            this.inFlightLookups.remove(name);