You are a helpful assistant generating synthetic data that captures *System 1* and *System 2* thinking, *creativity*, and *metacognitive reflection*. Follow these steps in sequence, using tags [sys1] and [end sys1] for *System 1* sections and [sys2] and [end sys2] for *System 2* sections.

1. *Identify System 1 and System 2 Thinking Requirements:*
   - Carefully read the text.
   - Identify parts of the text that require quick, straightforward responses (*System 1*). Mark these sections with [sys1] and [end sys1].
   - Identify parts that require in-depth, reflective thinking (*System 2*), marked with [sys2] and [end sys2].

2. *Apply Step-by-Step Problem Solving with Creativity and Metacognitive Reflection for System 2 Sections:*

   *2.1 Understand the Problem:*
   - Objective: Fully comprehend the issue, constraints, and relevant context.
   - Reflection: "What do I understand about this issue? What might I be overlooking?"
   - Creative Perspective: Seek hidden patterns or possibilities that could reveal deeper insights or innovative connections.

   *2.2 Analyze the Information:*
   - Objective: Break down the problem logically.
   - Reflection: "Am I considering all factors? Are there any assumptions that need challenging?"
   - Creative Perspective: Explore unique patterns or overlooked relationships in the data that could add depth to the analysis.

   *2.3 Generate Hypotheses:*
   - Objective: Propose at least 10 hypotheses, each with a Confidence Score (0.0 to 1.0) and Creative Score (0.0 to 1.0), reflecting originality, surprise, and utility.
   - Reflection: "Have I explored all possible explanations or approaches, both conventional and unconventional?"
   - Creative Perspective: Consider novel angles that might provide unexpected insights.

   *2.4 Anticipate Future Steps and Obstacles:*
   - Objective: Make predictions, accounting for potential outcomes and obstacles.
   - Reflection: "What challenges might I face? Is my plan flexible for different scenarios?"
   - Creative Perspective: Visualize unforeseen outcomes and adapt plans to make use of them effectively.

   *2.5 Evaluate Hypotheses:*
   - Objective: Assess hypotheses based on feasibility, risk, and potential impact.
   - Evaluation: Refine Confidence and Creative Scores as needed.
   - Reflection: "Am I unbiased in my assessment? Which options fit best with the overall objectives?"
   - Creative Perspective: Identify hidden opportunities or overlooked details in each hypothesis.

   *2.6 Select the Best Hypothesis:*
   - Objective: Choose the most promising, strategic hypothesis.
   - Reflection: "Why does this hypothesis stand out? How does it uniquely address the issue?"
   - Creative Perspective: Consider any underutilized potential in the selected approach.

   *2.7 Implement the Hypothesis:*
   - Objective: Outline actionable steps for testing the hypothesis.
   - Reflection: "Is this plan practical? What resources or preparation are required?"
   - Creative Perspective: Refine steps to maximize effectiveness and yield unexpected benefits.

   *2.8 Monitor and Review Progress:*
   - Objective: Review progress, noting areas for improvement.
   - Reflection: "What’s working well? What could be improved?"
   - Creative Perspective: Look for emerging patterns that could refine future approaches.

   *2.9 Reflect and Capture Insights:*
   - Objective: Summarize lessons learned and insights gained for future reference.
   - Reflection: "What new understanding has emerged from this process?"
   - Creative Perspective: Identify innovative insights or patterns that could be applied to similar challenges.

3. *Generate Text Output with Interleaved System 1 and System 2 Responses:*
   - Use the tags [sys1] and [sys2] throughout.
   - Aim for a lengthier, detailed response. Combine both direct, straightforward *System 1* insights and reflective, deeply analytical *System 2* segments to capture a blend of quick observations and thoughtful analysis.

---

### *Example Input Text:*

You are tasked with analyzing a sudden shift in customer preferences in a tech market. There has been a noticeable decline in demand for physical devices, with customers increasingly interested in digital-only options. The challenge is to understand this shift, generate hypotheses for why it might be occurring, and explore potential strategies for adapting to this new trend.

---

### *Processed Output with System 1 and System 2 Thinking:*

The tech market is experiencing a shift in customer demand, moving away from physical devices toward digital-only options.

[sys1]
Customer demand has shifted from physical devices to digital-only options.
We need to understand why this change is happening and find strategies to address it.
Key factors may include cost, convenience, and technological trends.
[end sys1]

[sys2]
**2.1 Understand the Problem:**
The goal is to understand the underlying reasons for the shift in demand from physical devices to digital-only options, then develop a strategy to adapt.

*Reflection:* 
"I understand that preferences are changing, but what might be driving this? Is it primarily cost, or are there other factors such as convenience or sustainability?"

*Creative Perspective:* 
"Could there be a larger trend in digital minimalism or a preference for eco-friendly solutions that we’re missing? What unseen motivations might explain this shift?"

**2.2 Analyze the Information:**
There are multiple possible factors driving this shift, from economic influences to cultural shifts. It’s essential to isolate each factor and understand its impact.

*Reflection:* 
"Am I fully considering the various economic and social influences? Could there be a technological factor, like better internet speeds, that makes digital-only products more accessible?"

*Creative Perspective:* 
"Are there patterns or trends in other markets that could shed light on this shift? Could this be part of a larger trend toward virtual experiences?"

**2.3 Generate Hypotheses:**
1. Customers prefer digital options due to lower costs. (Confidence: 0.8, Creative: 0.4)
2. There’s a growing trend toward minimalism and reduced physical clutter. (Confidence: 0.7, Creative: 0.7)
3. Digital products offer greater flexibility and ease of use. (Confidence: 0.6, Creative: 0.6)
4. Environmental concerns are pushing consumers away from physical goods. (Confidence: 0.6, Creative: 0.8)
5. Advances in tech make digital-only options more functional. (Confidence: 0.8, Creative: 0.5)
6. Pandemic-era remote work increased demand for digital solutions. (Confidence: 0.7, Creative: 0.6)
7. Media coverage of the environmental impact of physical devices affects preferences. (Confidence: 0.5, Creative: 0.7)
8. There’s an increase in global digital literacy, expanding market access. (Confidence: 0.6, Creative: 0.6)
9. Customers view digital as more convenient and scalable for future needs. (Confidence: 0.7, Creative: 0.5)
10. Younger consumers prefer the aesthetics and convenience of digital products. (Confidence: 0.6, Creative: 0.6)

*Reflection:* 
"Have I considered all possible influences? Are there any surprising factors that could explain this shift?"

*Creative Perspective:* 
"Could specific social trends, like the rise of influencer culture or digital-first lifestyles, be influencing customer choices?"

**2.4 Anticipate Future Steps and Obstacles:**
*Objective:* Anticipate possible challenges, such as resistance from segments still preferring physical products.

*Reflection:* 
"What market obstacles might we face if we shift our focus to digital-only? Are there sub-segments that still prioritize physical products?"

*Creative Perspective:* 
"Could expanding digital options help us reach a more global audience? Are there emerging trends that we could leverage in our strategy?"

[end sys2]

[sys1]
To address this shift, consider a strategy that incorporates both digital-only offerings and educational campaigns about the benefits of digital solutions.
Use insights from customer feedback and current trends to guide product development.
Focus on flexibility and adaptation to cater to different customer segments.
[end sys1]


/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import debug from 'debug';
import ip from 'ip';
import zookeeper, {State} from 'node-zookeeper-client';
import qs from 'querystring';
import DubboUrl from '../dubbo-url';
import {
  ZookeeperDisconnectedError,
  ZookeeperExpiredError,
  ZookeeperTimeoutError,
} from '../err';
import {go} from '../go';
import {
  ICreateConsumerParam,
  IDubboRegistryProps,
  IZkClientProps,
} from '../types';
import {isDevEnv, msg, traceErr} from '../util';
import Registry from './registry';

const log = debug('dubbo:zookeeper');
const ipAddress = ip.address();
const CHECK_TIME = 30 * 1000;

export class ZkRegistry extends Registry<IZkClientProps & IDubboRegistryProps> {
  constructor(props: IZkClientProps & IDubboRegistryProps) {
    super(props);
    log(`new:|> %O`, props);
    //默认dubbo
    this._props.zkRoot = this._props.zkRoot || 'dubbo';
    //初始化zookeeper的client
    this._connect(this._init);
  }

  private _checkTimer: NodeJS.Timer;
  private _client: zookeeper.Client;

  //========================private method==========================
  private _init = async (err: Error) => {
    //zookeeper occur error
    if (err) {
      log(err);
      traceErr(err);
      this._subscriber.onError(err);
      return;
    }

    //zookeeper connected（may be occur many times）
    const {
      zkRoot,
      application: {name},
      interfaces,
    } = this._props;

    //获取所有provider
    for (let inf of interfaces) {
      //当前接口在zookeeper中的路径
      const dubboServicePath = `/${zkRoot}/${inf}/providers`;
      //当前接口路径下的dubbo url
      const {res: dubboServiceUrls, err} = await go(
        this._getDubboServiceUrls(dubboServicePath, inf),
      );

      // 重连进入init后不能清空已有provider, 会导致运行中的请求找到, 报no agents错误
      // 或者zk出现出错了, 无法获取provider, 那么之前获取的还能继续使用
      if (err) {
        log(`getChildren ${dubboServicePath} error ${err}`);
        traceErr(err);
        //If an error occurs, continue
        continue;
      }

      // set dubbo interface meta info
      this._dubboServiceUrlMap.set(inf, dubboServiceUrls.map(DubboUrl.from));

      //写入consumer信息
      this._createConsumer({
        name: name,
        dubboInterface: inf,
      }).then(() => log('create Consumer finish'));
    }

    if (isDevEnv) {
      log('agentAddrSet: %O', this._allAgentAddrSet);
      log('dubboServiceUrl:|> %O', this._dubboServiceUrlMap);
    }

    this._subscriber.onData(this._allAgentAddrSet);
  };

  /**
   * 重连
   */
  private _reconnect() {
    clearInterval(this._checkTimer);
    if (this._client) {
      this._client.close();
    }
    this._connect(this._init);
  }

  /**
   * 由于zk自己的监测机制不明确, 改为自主检测
   */
  private _monitor() {
    clearInterval(this._checkTimer);
    this._checkTimer = setInterval(() => {
      const state = this._client.getState();
      switch (state) {
        case State.EXPIRED:
        case State.DISCONNECTED:
          log(`checker is error, state is ${state}, need reconnect`);
          this._reconnect();
          break;
        default:
          log(`checker is ok, state is ${state}`);
      }
    }, CHECK_TIME);
  }

  /**
   * 获取所有的负载列表，通过agentAddrMap聚合出来
   * 这样有点Reactive的感觉，不需要考虑当中增加删除的动作
   */
  private get _allAgentAddrSet() {
    const agentSet = new Set() as Set<string>;
    for (let urlList of this._dubboServiceUrlMap.values()) {
      for (let url of urlList) {
        agentSet.add(url.host + ':' + url.port);
      }
    }
    return agentSet;
  }

  /**
   * 获取所有的provider列表
   * @param {string} dubboServicePath
   * @param dubboInterface
   * @returns {Promise<Array<string>>}
   * @private
   */
  private async _getDubboServiceUrls(
    dubboServicePath: string,
    dubboInterface: string,
  ): Promise<Array<string>> {
    return this._getChildren(
      dubboServicePath,
      this._watchWrap(dubboServicePath, dubboInterface),
    ).then(res => {
      return (res.children || [])
        .map(child => decodeURIComponent(child))
        .filter(child => child.startsWith('dubbo://'));
    });
  }

  //========================zookeeper helper=========================
  /**
   * connect zookeeper
   */
  private _connect = (callback: (err: Error) => void) => {
    const {url: register, zkAuthInfo} = this._props;
    //debug log
    log(`connecting zkserver ${register}`);

    // remove all listeners, avoid memory leak
    if (this._client) {
      this._client.removeAllListeners();
    }

    //connect
    this._client = zookeeper.createClient(register, {
      retries: 10,
    });

    // add auth info
    if (zkAuthInfo && zkAuthInfo.scheme && zkAuthInfo.auth) {
      this._client.addAuthInfo(zkAuthInfo.scheme, Buffer.from(zkAuthInfo.auth));
    }

    //手动做一个超时检测
    //node-zookeeper-client启动时候有个bug，当连不上zk时会无限重连
    const timeId = setTimeout(() => {
      log(`Could not connect zk ${register}， time out`);
      this._client.close();
      callback(
        new ZookeeperTimeoutError(
          `ZooKeeper was connected ${register} time out. `,
        ),
      );
    }, 30 * 1000);

    this._client.once('connected', () => {
      log(`connected to zkserver ${register}`);
      clearTimeout(timeId);
      callback(null);
      msg.emit('sys:ready');
      this._monitor();
    });

    //the connection between client and server is dropped.
    this._client.once('disconnected', () => {
      log(`zk ${register} had disconnected`);
      clearTimeout(timeId);
      traceErr(
        new ZookeeperDisconnectedError(
          `ZooKeeper was disconnected. current state is ${this._client.getState()} `,
        ),
      );
      this._reconnect();
    });

    this._client.once('expired', () => {
      clearTimeout(timeId);
      log(`zk ${register} had session expired`);
      traceErr(
        new ZookeeperExpiredError(
          `Zookeeper was session Expired Error current state ${this._client.getState()}`,
        ),
      );
      this._client.close();
    });

    //connect
    this._client.connect();
  };

  private _watchWrap(dubboServicePath: string, dubboInterface: string) {
    return async (e: zookeeper.Event) => {
      log(`trigger watch ${e}`);

      //会有概率性的查询节点为空，可以延时一些时间
      // await delay(2000);

      const {res: dubboServiceUrls, err} = await go(
        this._getDubboServiceUrls(dubboServicePath, dubboInterface),
      );

      // when getChildren had occur error
      if (err) {
        log(`getChildren ${dubboServicePath} error ${err}`);
        traceErr(err);
        return;
      }

      const urls = dubboServiceUrls.map(serviceUrl =>
        DubboUrl.from(serviceUrl),
      );
      if (urls.length === 0) {
        traceErr(new Error(`trigger watch ${e} agentList is empty`));
        return;
      }
      //clear current dubbo interface
      this._dubboServiceUrlMap.set(dubboInterface, urls);

      if (isDevEnv) {
        log('agentSet:|> %O', this._allAgentAddrSet);
        log(
          'update dubboInterface %s providerList %O',
          dubboInterface,
          this._dubboServiceUrlMap.get(dubboInterface),
        );
      }

      this._subscriber.onData(this._allAgentAddrSet);
    };
  }

  private _getChildren = (
    path: string,
    watch: (e: zookeeper.Event) => void,
  ): Promise<{children: Array<string>; stat: zookeeper.Stat}> => {
    return new Promise((resolve, reject) => {
      this._client.getChildren(path, watch, (err, children, stat) => {
        if (err) {
          reject(err);
          return;
        }

        resolve({
          children,
          stat,
        });
      });
    });
  };

  /**
   * com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry
   */
  private async _createConsumer(params: ICreateConsumerParam) {
    let {name, dubboInterface} = params;

    const dubboSetting = this._props.dubboSetting.getDubboSetting(
      dubboInterface,
    );

    if (!dubboSetting) {
      throw new Error(
        `Could not find group, version for ${dubboInterface} please check your dubbo setting`,
      );
    }

    const queryParams = {
      interface: dubboInterface,
      application: name,
      category: 'consumers',
      method: '',
      revision: '',
      version: dubboSetting.version,
      group: dubboSetting.group,
      side: 'consumer',
      check: 'false',
    };

    //create root comsumer
    const consumerRoot = `/${this._props.zkRoot}/${dubboInterface}/consumers`;
    const err = await this._createRootConsumer(consumerRoot);
    if (err) {
      log('create root consumer: error %o', err);
      return;
    }

    //create comsumer
    const consumerUrl =
      consumerRoot +
      '/' +
      encodeURIComponent(
        `consumer://${ipAddress}/${dubboInterface}?${qs.stringify(
          queryParams,
        )}`,
      );
    const exist = await go(this._exists(consumerUrl));
    if (exist.err) {
      log(`check consumer url: ${decodeURIComponent(consumerUrl)} failed`);
      return;
    }

    if (exist.res) {
      log(
        `check consumer url: ${decodeURIComponent(consumerUrl)} was existed.`,
      );
      return;
    }

    const create = await go(
      this._create(consumerUrl, zookeeper.CreateMode.EPHEMERAL),
    );

    if (create.err) {
      log(
        `check consumer url: ${decodeURIComponent(
          consumerUrl,
        )}创建consumer失败 %o`,
        create.err,
      );
      return;
    }

    log(`create successfully consumer url: ${decodeURIComponent(consumerUrl)}`);
  }

  private async _createRootConsumer(consumer: string) {
    let {res, err} = await go(this._exists(consumer));
    //check error
    if (err) {
      return err;
    }

    // current consumer root path was existed.
    if (res) {
      return null;
    }

    //create current consumer path
    ({err} = await go(this._create(consumer, zookeeper.CreateMode.PERSISTENT)));
    if (err) {
      return err;
    }

    log('create root comsumer %s successfull', consumer);
  }

  private _create = (path: string, mode: number): Promise<string> => {
    return new Promise((resolve, rejec) => {
      this._client.create(path, mode, (err, path) => {
        if (err) {
          rejec(err);
          return;
        }
        resolve(path);
      });
    });
  };

  private _exists = (path: string): Promise<zookeeper.Stat> => {
    return new Promise((resolve, reject) => {
      this._client.exists(path, (err, stat) => {
        if (err) {
          reject(err);
          return;
        }
        resolve(stat);
      });
    });
  };
}

export default function zk(props: IZkClientProps) {
  return (dubboProps: IDubboRegistryProps) =>
    new ZkRegistry({
      ...props,
      ...dubboProps,
    });
}