* comparison to the normal way to access the stack trace, {@link Throwable#getStackTrace()
   * throwable.getStackTrace()}. Note, however, that this method's special implementation is not
   * available for all platforms and configurations. If that implementation is unavailable, this
   * method falls back to {@code getStackTrace}. Callers that require the special implementation can

  @Param Mode mode;

  enum Mode {
    LAZY_STACK_TRACE {
      @Override
      List<StackTraceElement> getStackTrace(Throwable t) {
        return lazyStackTrace(t);
      }
    },
    GET_STACK_TRACE {
      @Override
      List<StackTraceElement> getStackTrace(Throwable t) {
        return asList(t.getStackTrace());
      }
    };

    boolean timeIt(int reps, int breakAt) {
      boolean dummy = false;

  @Param Mode mode;

  enum Mode {
    LAZY_STACK_TRACE {
      @Override
      List<StackTraceElement> getStackTrace(Throwable t) {
        return lazyStackTrace(t);
      }
    },
    GET_STACK_TRACE {
      @Override
      List<StackTraceElement> getStackTrace(Throwable t) {
        return asList(t.getStackTrace());
      }
    };

    boolean timeIt(int reps, int breakAt) {
      boolean dummy = false;

              @Override
              public Integer call() {
                return Thread.currentThread().getStackTrace().length;
              }
            },
            directExecutor());
    settableFuture.set(null);
    assertThat(getDone(stackDepthCheck))
        .isLessThan(Thread.currentThread().getStackTrace().length + 100);
  }

              @Override
              public Integer call() {
                return Thread.currentThread().getStackTrace().length;
              }
            },
            directExecutor());
    settableFuture.set(null);
    assertThat(getDone(stackDepthCheck))
        .isLessThan(Thread.currentThread().getStackTrace().length + 100);
  }

  }

  @J2ktIncompatible
  @GwtIncompatible // lazyStackTrace(Throwable)
  public void testLazyStackTrace() {
    Exception e = new Exception();
    StackTraceElement[] originalStackTrace = e.getStackTrace();

    assertThat(lazyStackTrace(e)).containsExactly((Object[]) originalStackTrace).inOrder();

    assertThrows(UnsupportedOperationException.class, () -> lazyStackTrace(e).set(0, null));

                entity.setConfigId(crawlingConfig.getConfigId());
            }
            return entity;
        });

        failureUrl.setErrorName(errorName);
        failureUrl.setErrorLog(getStackTrace(e));
        failureUrl.setLastAccessTime(ComponentUtil.getSystemHelper().getCurrentTimeAsLong());
        failureUrl.setThreadName(Thread.currentThread().getName());

        bhv.insertOrUpdate(failureUrl, op -> {

        this.options = options;
        this.tree = tree.acquire();
        this.tree_num = tree.getTreeId();

        if ( cfg.isTraceResourceUsage() ) {
            this.creationBacktrace = Thread.currentThread().getStackTrace();
        }
        else {
            this.creationBacktrace = null;
        }
    }


    /**
     * @param cfg
     * @param fid
     * @param tree
     * @param unc

  }

  @J2ktIncompatible
  @GwtIncompatible // lazyStackTrace(Throwable)
  public void testLazyStackTrace() {
    Exception e = new Exception();
    StackTraceElement[] originalStackTrace = e.getStackTrace();

    assertThat(lazyStackTrace(e)).containsExactly((Object[]) originalStackTrace).inOrder();

    assertThrows(UnsupportedOperationException.class, () -> lazyStackTrace(e).set(0, null));

  virtual void SetCancellationManager(
      CancellationManager* cancellation_manager) = 0;

  // Returns the stack trace set by `SetStackTrace` if exists.
  virtual absl::optional<ManagedStackTrace> GetStackTrace() = 0;

  virtual void SetStepId(int64_t step_id) = 0;

  // For LLVM style RTTI.
  static bool classof(const AbstractOperation* ptr) {
    return ptr->getKind() == kEager || ptr->getKind() == kTfrt;
  }