如何在nodejs中的服务之间共享数据

时间:2016-12-20 00:53:29

标签: node.js express feathersjs

我创建了两个服务类。下面是ShellService类定义。

class ShellService {

  create(data, params) {
    if (Array.isArray(data)) {
      return Promise.all(data.map(current => this.create(current)));
    }
    let hostname=params.query.hostname
    let port = params.query.port
    const id = _.uniqueId();

    this.shells[id] = spawn('mongo', ['--host', hostname, '--port', port]);

    return Promise.resolve({id});
  }
...
}
module.exports = function() {
  // Initialize our service with any options it requires
  let service =new ShellService()

  return service;
};

在其create方法中,它创建一个shell实例并将其添加到其shell数组对象上。我有另一个休息服务类,并希望访问shells数组对象。我怎样才能做到这一点?我在下面尝试但没有工作:

const shellService = require('../shell-service')
class SocketService {
  ...

我声明了SocketService类并要求shell服务。但我无法在shellService.XXXX课程中致电SocketService。我该怎么做才能实现这个目标?

1 个答案:

答案 0 :(得分:1)

由于您已经在this.shells[id]中存储了shell引用,因此您可能希望实现一个.find service method,它返回所有可用shell的列表:

class ShellService {
  find() {
    const shellProcesses = this.shells;
    const shells = Object.keys(shellProcesses).map(key => {
      const shell = shellProcesses[key];

      return {
        id: shell.pid
      }
    });

    return Promise.resolve(shells);
  }

  create(data, params) {
    if (Array.isArray(data)) {
      return Promise.all(data.map(current => this.create(current)));
    }
    let hostname=params.query.hostname
    let port = params.query.port
    const id = _.uniqueId();

    this.shells[id] = spawn('mongo', ['--host', hostname, '--port', port]);

    return Promise.resolve({id});
  }
}
module.exports = function() {
  // Initialize our service with any options it requires
  let service =new ShellService()

  return service;
};

注册为Feathers服务后,您可以使用app.service('shells').find().then(shellInfo => )