Method checkNotNull

api/src/context/java/io/grpc/Context.java:1069–1075

(T reference, Object errorMessage)

  }

  @CanIgnoreReturnValue
  static <T> T checkNotNull(T reference, Object errorMessage) {
    if (reference == null) {
      throw new NullPointerException(String.valueOf(errorMessage));
    }
    return reference;
  }

  private enum DirectExecutor implements Executor {
    INSTANCE;