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Execute asynchronous functions in order and limit the number of simultaneous executions

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scheduler

Execute asynchronous functions in order and limit the number of simultaneous executions。 按顺序执行异步函数,并限制同时执行的数量。

examples文档

class: Scheduler( limit )

生成一个scheduler

  • limit: number; default:4 Scheduler最大同时执行的数量;
  • Returns: scheduler
let scheduler = new Scheduler(2);

function: scheduler.add(handler, :args, :callback)

添加scheduler要执行的函数

  • handler: function|async function 要执行的异步或同步函数
  • args: 要执行函数的参数
  • callback: 回调函数
  • Returns:要执行的函数返回的结果
async function timeoutAdd(time, ...args) {
  return new Promise(resolve => {
    setTimeout(() => {
      let result = (args && args.length) && args.reduce((pre, cur) => {
        return pre + cur;
      });
      console.log(`time:${time},  args:${args}, result:${result}`)
      resolve(result)
    }, time)
  });
}
function callback(err, res) {
  console.log(`callback:${res}`);
}


scheduler.add(timeoutAdd, [500, 3, 2]);
scheduler.add(() => timeoutAdd(1500, 2, 2));
scheduler.add(() => timeoutAdd(1500, 2, 2), null, callback);
scheduler.add(() => timeoutAdd(1500, 2, 2), null, (err, res) => {
  console.log(`callback:${res}`)
});

function: scheduler.adds(handlers, :callback)

添加scheduler要执行的函数

  • handlers: array function 要执行的异步或同步函数数组
  • callback: 回调函数
  • Returns:要执行的函数返回的结果
scheduler.adds([() => timeoutAdd(1000, 1, 3), () => timeoutAdd(500, 1, 2, 3, 4), () => timeoutAdd(400, 1, 4), () => timeoutAdd(600)];
scheduler.adds([{
  handler: timeoutAdd,
  args: [3000, 1, 3],
}]);
scheduler.adds([{
    handler: () => timeoutAdd(3000, 1, 3),
  }, {
    handler: () => timeoutAdd(1000),
  },
  {
    handler: timeoutAdd,
    args: [2000]
  }, {
    handler: timeoutAdd,
    args: [100, 1, 5],
    callback: callback,
  }, {
    handler: (val) => Promise.resolve(val),
    args: ['哈哈哈'],
    callback: (err, res) => {
      console.log(`callback:${res}`)
    },
  }
]);

获取函数返回的结果

console.log('获取函数结果', await scheduler.add(timeoutAdd, [1, 9, 7]));
console.log('获取函数结果',await scheduler.adds([{
  handler: () => timeoutAdd(0, 1, 3),
}, {
  handler: () => timeoutAdd(0,3,4),
}]))

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Execute asynchronous functions in order and limit the number of simultaneous executions

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