| /* |
| * 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. |
| */ |
| |
| 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(); |
| } |
| |
| if (!runningTaskCount) { |
| resolve(rets); |
| } |
| }); |
| } |
| |
| module.exports.runTasks = runTasks; |