| function runTasks( |
| taskParamsLists, createTask, concurrency |
| ) { |
| concurrency = Math.min(taskParamsLists.length, concurrency); |
| return new Promise((resolve, reject) => { |
| let runningTaskCount = 0; |
| let cursor = 0; |
| let rets = []; |
| |
| function finishTask(res, idx) { |
| rets[idx] = res; |
| processNext(); |
| } |
| |
| function failTask(e) { |
| console.error(e); |
| processNext(); |
| } |
| |
| function processNext() { |
| runningTaskCount--; |
| addTask(); |
| |
| if (runningTaskCount === 0) { |
| resolve(rets); |
| } |
| } |
| |
| function addTask() { |
| const param = taskParamsLists[cursor]; |
| if (param) { |
| const currentTaskIdx = cursor; |
| runningTaskCount++; |
| createTask(param) |
| .then((res) => finishTask(res, currentTaskIdx)) |
| .catch(failTask); |
| cursor++; |
| } |
| } |
| |
| for (let i = 0; i < concurrency; i++) { |
| addTask(); |
| } |
| }); |
| } |
| |
| module.exports.runTasks = runTasks; |