doDispatchAction = function()

in src/core/echarts.ts [1888:1999]
89 lines of code
22 McCabe index (conditional complexity)

        doDispatchAction = function (this: ECharts, payload: Payload, silent: boolean): void {
            const ecModel = this.getModel();
            const payloadType = payload.type;
            const escapeConnect = payload.escapeConnect;
            const actionWrap = actions[payloadType];
            const actionInfo = actionWrap.actionInfo;

            const cptTypeTmp = (actionInfo.update || 'update').split(':');
            const updateMethod = cptTypeTmp.pop();
            const cptType = cptTypeTmp[0] != null && parseClassType(cptTypeTmp[0]);

            this[IN_MAIN_PROCESS_KEY] = true;

            let payloads: Payload[] = [payload];
            let batched = false;
            // Batch action
            if (payload.batch) {
                batched = true;
                payloads = map<Payload['batch'][0], Payload, unknown>(payload.batch, function (item) {
                    item = defaults(extend({}, item), payload);
                    item.batch = null;
                    return item as Payload;
                });
            }

            const eventObjBatch: ECEventData[] = [];
            let eventObj: ECActionEvent;

            const isSelectChange = isSelectChangePayload(payload);
            const isHighDown = isHighDownPayload(payload);

            // Only leave blur once if there are multiple batches.
            if (isHighDown) {
                allLeaveBlur(this._api);
            }

            each(payloads, (batchItem) => {
                // Action can specify the event by return it.
                eventObj = actionWrap.action(batchItem, this._model, this._api) as ECActionEvent;
                // Emit event outside
                eventObj = eventObj || extend({} as ECActionEvent, batchItem);
                // Convert type to eventType
                eventObj.type = actionInfo.event || eventObj.type;
                eventObjBatch.push(eventObj);

                // light update does not perform data process, layout and visual.
                if (isHighDown) {
                    const { queryOptionMap, mainTypeSpecified } = modelUtil.preParseFinder(payload as ModelFinder);
                    const componentMainType = mainTypeSpecified ? queryOptionMap.keys()[0] : 'series';
                    updateDirectly(this, updateMethod, batchItem as Payload, componentMainType);
                    markStatusToUpdate(this);
                }
                else if (isSelectChange) {
                    // At present `dispatchAction({ type: 'select', ... })` is not supported on components.
                    // geo still use 'geoselect'.
                    updateDirectly(this, updateMethod, batchItem as Payload, 'series');
                    markStatusToUpdate(this);
                }
                else if (cptType) {
                    updateDirectly(this, updateMethod, batchItem as Payload, cptType.main, cptType.sub);
                }
            });

            if (updateMethod !== 'none' && !isHighDown && !isSelectChange && !cptType) {
                try {
                    // Still dirty
                    if (this[PENDING_UPDATE]) {
                        prepare(this);
                        updateMethods.update.call(this, payload);
                        this[PENDING_UPDATE] = null;
                    }
                    else {
                        updateMethods[updateMethod as keyof typeof updateMethods].call(this, payload);
                    }
                }
                catch (e) {
                    this[IN_MAIN_PROCESS_KEY] = false;
                    throw e;
                }
            }

            // Follow the rule of action batch
            if (batched) {
                eventObj = {
                    type: actionInfo.event || payloadType,
                    escapeConnect: escapeConnect,
                    batch: eventObjBatch
                };
            }
            else {
                eventObj = eventObjBatch[0] as ECActionEvent;
            }

            this[IN_MAIN_PROCESS_KEY] = false;

            if (!silent) {
                const messageCenter = this._messageCenter;
                messageCenter.trigger(eventObj.type, eventObj);
                // Extra triggered 'selectchanged' event
                if (isSelectChange) {
                    const newObj: SelectChangedPayload = {
                        type: 'selectchanged',
                        escapeConnect: escapeConnect,
                        selected: getAllSelectedIndices(ecModel),
                        isFromClick: payload.isFromClick || false,
                        fromAction: payload.type as 'select' | 'unselect' | 'toggleSelected',
                        fromActionPayload: payload
                    };
                    messageCenter.trigger(newObj.type, newObj);
                }
            }
        };