<V> ClosingCallable<V> waitFor(ClosingCallable<V> closingCallable) {
      return waitFor(closingCallable, ClosingCallable.class);
    }

    @SuppressWarnings("unchecked") // proxy for a generic class
    <V> AsyncClosingCallable<V> waitFor(AsyncClosingCallable<V> asyncClosingCallable) {
      return waitFor(asyncClosingCallable, AsyncClosingCallable.class);
    }

            return inputStream;
        }

        @Override
        public InputStream getErrorStream() {
            return null;
        }

        @Override
        public int waitFor() throws InterruptedException {
            return 0;
        }

        @Override
        public int exitValue() {
            return 0;
        }

        @Override

    return method.getName().startsWith("enterIf");
  }

  /** Identifies all waitForXxx methods, which must be called while occupying the monitor. */
  private static boolean isWaitFor(Method method) {
    return method.getName().startsWith("waitFor");
  }

  /** Determines whether the given method takes a Guard as its first parameter. */
  private static boolean isGuarded(Method method) {

        private final int exitValue;

        public TestProcess(int exitValue) {
            this.exitValue = exitValue;
        }

        @Override
        public int waitFor() throws InterruptedException {
            return exitValue;
        }

        @Override
        public int exitValue() {
            return exitValue;
        }

        @Override

        Future<String> stdoutFuture = readStreamAsync(process.getInputStream());
        Future<String> stderrFuture = readStreamAsync(process.getErrorStream());

        int returnCode = process.waitFor();
        String stdout = stdoutFuture.get();
        String stderr = stderrFuture.get();
        return new ExecResult(stdout, stderr, returnCode);
    }

    Thread waiter =
        new Thread() {
          @Override
          public void run() {
            try {
              service.awaitTermination(1, DAYS);
            } catch (InterruptedException e) {
              return;
            }
          }
        };
    waiter.start();
    awaitTimedWaiting(waiter);
    service.shutdown();

    // Check that we wait long enough anyway (presumably as long as MAX_VALUE nanos):
    TimedWaiterThread waiter = new TimedWaiterThread(future, Long.MAX_VALUE, SECONDS);
    waiter.start();
    waiter.awaitWaiting();

    future.set(1);
    waiter.join();
  }

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testSetNull() throws Exception {
    future.set(null);

    Thread waiter =
        new Thread() {
          @Override
          public void run() {
            try {
              service.awaitTermination(1, DAYS);
            } catch (InterruptedException e) {
              return;
            }
          }
        };
    waiter.start();
    awaitTimedWaiting(waiter);
    service.shutdown();

    // Check that we wait long enough anyway (presumably as long as MAX_VALUE nanos):
    TimedWaiterThread waiter = new TimedWaiterThread(future, Long.MAX_VALUE, SECONDS);
    waiter.start();
    waiter.awaitWaiting();

    future.set(1);
    waiter.join();
  }

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testSetNull() throws Exception {
    future.set(null);

    NoOpService service = new NoOpService();
    Thread waiter =
        new Thread() {
          @Override
          public void run() {
            service.awaitTerminated();
          }
        };
    waiter.start();
    service.startAsync().awaitRunning();
    assertEquals(State.RUNNING, service.state());
    service.stopAsync();