}

    // ===================================================================================
    //                                                                        Assist Logic
    //                                                                        ============
    protected JsonResponse<ApiResult> asJson(final ApiResult bean) {
        return new JsonResponse<>(bean);
    }

    InputStream openStream() throws IOException;

    /**
     * Provides a user-friendly hint about the location of the source.
     * This could be a local file path, a URI or just an empty string.
     * The intention is to assist users during error reporting.
     *
     * @return a user-friendly hint about the location of the source, never {@code null}
     */
    @Nonnull
    String getLocation();

    /**

        return toString();
    }

    // ===================================================================================
    //                                                                        Assist Class
    //                                                                        ============
    public class DocMeta implements Serializable {

        private static final long serialVersionUID = 1L;

    @Resource
    protected FessConfig fessConfig;

    // ===================================================================================
    //                                                                              Assist
    //                                                                              ======
    @Override
    protected void prepareAssistDirection(final FwAssistDirection direction) {

		// (i.e. the G has been blocked in a syscall).
		gs.syscallBegin(start, goID, ev.Stack())
	}

	// Note down the goroutine transition.
	_, inMarkAssist := gs.activeRanges["GC mark assist"]
	ctx.GoroutineTransition(ctx.elapsed(ev.Time()), viewerGState(from, inMarkAssist), viewerGState(to, inMarkAssist))
}

func (g *goroutineGenerator) ProcRange(ctx *traceContext, ev *trace.Event) {

        return toString();
    }

    // ===================================================================================
    //                                                                        Assist Class
    //                                                                        ============
    public class DocMeta implements Serializable {

        private static final long serialVersionUID = 1L;

        return redirect(getClass());
    }

    // ===================================================================================
    //                                                                        Assist Logic
    //                                                                        ============

    // ===================================================================================

        });
    }

    // ===================================================================================
    //                                                                        Assist Logic
    //                                                                        ============

    protected void registerEnvItems(final RenderData data) {
        RenderDataUtil.register(data, "envItems", getEnvItems());

        return toString();
    }

    // ===================================================================================
    //                                                                        Assist Class
    //                                                                        ============
    public class DocMeta implements Serializable {

        private static final long serialVersionUID = 1L;

			hasSyncBlockTime = true
		}
		if dt, ok := summary.RangeTime["GC mark assist"]; ok && dt > 0 {
			hasGCMarkAssistTime = true
		}
	}
	if !hasSchedWaitTime {
		t.Error("missing sched wait time")
	}
	if !hasSyncBlockTime {
		t.Error("missing sync block time")
	}
	if !hasGCMarkAssistTime {
		t.Error("missing GC mark assist time")
	}
}

func TestSummarizeGoroutinesRegionsTrace(t *testing.T) {