check(executed.compareAndSet(false, true)) { "Already Executed" }

    timeout.enter()
    callStart()
    try {
      client.dispatcher.executed(this)
      return getResponseWithInterceptorChain()
    } finally {
      client.dispatcher.finished(this)
    }
  }

  override fun enqueue(responseCallback: Callback) {
    check(executed.compareAndSet(false, true)) { "Already Executed" }

    callStart()

                        } catch( InterruptedException ie ) {
                            throw new TransportException( ie );
                        } finally {
                            response_map.remove( req );
                        }
                    }
                } finally {
                    BufferCache.releaseBuffer( req.txn_buf );
                    BufferCache.releaseBuffer( resp.txn_buf );
                }

  }

  private static final ByteSource BROKEN_CLOSE_SOURCE =
      new TestByteSource(new byte[10], CLOSE_THROWS);
  private static final ByteSource BROKEN_OPEN_SOURCE =
      new TestByteSource(new byte[10], OPEN_THROWS);
  private static final ByteSource BROKEN_READ_SOURCE =
      new TestByteSource(new byte[10], READ_THROWS);
  private static final ByteSink BROKEN_CLOSE_SINK = new TestByteSink(CLOSE_THROWS);

   * started execution. It is unclear from the {@code ExecutorService} specification if these should
   * be included, and it's much easier to implement the interpretation that they not be. Finally, a
   * call to {@code shutdown} or {@code shutdownNow} may result in concurrent calls to {@code
   * invokeAll/invokeAny} throwing RejectedExecutionException, although a subset of the tasks may
   * already have been executed.

public class MacHashFunctionTest extends TestCase {

  private static final ImmutableSet<String> INPUTS = ImmutableSet.of("", "Z", "foobar");

  private static final SecretKey MD5_KEY =
      new SecretKeySpec("secret key".getBytes(UTF_8), "HmacMD5");
  private static final SecretKey SHA1_KEY =
      new SecretKeySpec("secret key".getBytes(UTF_8), "HmacSHA1");
  private static final SecretKey SHA256_KEY =

    cacheRef.set(recursiveCache);

    // tells the test when the computation has completed
    final CountDownLatch doneSignal = new CountDownLatch(1);

    Thread thread =
        new Thread() {
          @Override
          public void run() {
            try {
              cacheRef.get().getUnchecked(3);
            } finally {
              doneSignal.countDown();
            }
          }
        };

    cacheRef.set(recursiveCache);

    // tells the test when the computation has completed
    final CountDownLatch doneSignal = new CountDownLatch(1);

    Thread thread =
        new Thread() {
          @Override
          public void run() {
            try {
              cacheRef.get().getUnchecked(3);
            } finally {
              doneSignal.countDown();
            }
          }
        };

    private class ResolveTask implements Runnable {

        private final ClassLoader classLoader;

        private final CountDownLatch latch;

        private final Artifact artifact;

        private final RepositorySystemSession session;

        private final List<ArtifactRepository> remoteRepositories;

        private final ArtifactResolutionResult result;

        ResolveTask(

            implements AutoCloseable {
        public final LookupInvoker<O, R, C> invoker;
        public final ProtoLookup protoLookup;
        public final R invokerRequest;
        public final Function<String, Path> cwdResolver;
        public final Function<String, Path> installationResolver;
        public final Function<String, Path> userResolver;
        public final Session session;

        : new ArrayTable<R, C, V>(table);
  }

  private final ImmutableList<R> rowList;
  private final ImmutableList<C> columnList;

  // TODO(jlevy): Add getters returning rowKeyToIndex and columnKeyToIndex?
  private final ImmutableMap<R, Integer> rowKeyToIndex;
  private final ImmutableMap<C, Integer> columnKeyToIndex;
  private final @Nullable V[][] array;