}
    final ReentrantLock lock = this.lock;
    lock.lock();

    boolean satisfied = false;
    try {
      return satisfied = guard.isSatisfied();
    } finally {
      if (!satisfied) {
        lock.unlock();
      }
    }
  }

  /**
   * Enters this monitor if the guard is satisfied. Blocks at most the given time acquiring the
   * lock, but does not wait for the guard to be satisfied.

        parent.appendChild(section);

        Element title = document.createElement("title");
        section.appendChild(title);
        title.appendChild(document.createTextNode("Script blocks added by the "));
        Element literal = document.createElement("literal");
        title.appendChild(literal);
        literal.appendChild(document.createTextNode(extension.getPluginId()));

        parent.appendChild(summarySection);

        Element title = document.createElement("title");
        summarySection.appendChild(title);
        title.appendChild(document.createTextNode("Script blocks"));

        Collection<BlockDoc> classBlocks = classDoc.getClassBlocks();
        if (!classBlocks.isEmpty()) {
            Element table = document.createElement("table");
            summarySection.appendChild(table);

    public ClassDocMethodsBuilder(JavadocConverter converter, GenerationListener listener) {
        this.javadocConverter = converter;
        this.listener = listener;
    }

    /**
     * Builds the methods and script blocks of the given class. Assumes properties have already been built.
     */
    public void build(ClassDoc classDoc) {
        Set<String> signatures = new HashSet<String>();

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class BlockTableRenderer {
    public void renderTo(Iterable<BlockDoc> blocks, Element parent) {
        Document document = parent.getOwnerDocument();

        // <thead>
        //   <tr>
        //     <td>Block</td>
        //     <td>Description</td>
        //   </tr>
        // </thead>
        Element thead = document.createElement("thead");

  protected abstract <V> ListenableFuture<V> createListenableFuture(
      V value, @Nullable Exception except, CountDownLatch waitOn);

  /** Tests that the {@link Future#get()} method blocks until a value is available. */
  public void testGetBlocksUntilValueAvailable() throws Throwable {

    assertFalse(future.isDone());
    assertFalse(future.isCancelled());

    // ThreadLocal is not available to GWT, so we always reuse the same
    // instance.  It is always safe to return the same instance because
    // javascript is single-threaded, and only used by blocks that doesn't
    // involve async callbacks.
    return CHAR_BUFFER;
  }

  private Platform() {}

 * strategies.
 *
 * <ul>
 *   <li>SafeAtomicHelper: uses Atomic FieldsUpdaters to implement synchronization
 *   <li>SynchronizedHelper: uses {@code synchronized} blocks for synchronization
 * </ul>
 *
 * To force selection of our fallback strategies we load {@link AggregateFutureState} (and all of
 * {@code com.google.common.util.concurrent}) in degenerate class loaders which make certain

      /*
       * Using weak references here could let us release exceptions earlier, but:
       *
       * 1. On Android, querying a WeakReference blocks if the GC is doing an otherwise-concurrent
       * pass.
       *
       * 2. We would probably choose to compare exceptions using == instead of equals() (for

      }

      /**
       * Blocks until the task is complete or the timeout expires. Throws a {@link TimeoutException}
       * if the timer expires, otherwise behaves like {@link #get()}.
       */
      V get(long nanos)
          throws TimeoutException, CancellationException, ExecutionException, InterruptedException {

        // Attempt to acquire the shared lock with a timeout.