tasks

celery 是啥？ 由python 编写 的异步生产者消费者设计模式下 的实例 举个例子： 现有两个进程 生产者进程A 消费者进程B 现在的情况是 逻辑推导： A 产出栗子 B 要吃栗子 那么这两个进程必然是 B依赖于A 耦合度很高且是一个耗时操作 B -----> （发送请求给A）------->(等待A 产出栗子也许会很久)------->(A响应栗子给B)------->（B得到栗子） B 可能是个很多服务的集成后台之类很忙大忙人不想一直等等等 那么 celery 的任务就是 替B 去等 逻辑推导： A 产出栗子 B 要吃栗子 C celery B (替我去取栗子)-----> C（发送请求给A）------->(等待A 产出栗子也许会很久)------->(A响应栗子给C)------->（B得到栗子） (C 可以去把栗子存在一个地方B直接去取就好了) 那么celery 的本质知道了：一个中间人角色 ，类似快递小哥，跑腿的 作用： 1 防止线程阻塞提高性能 2低耦合解耦 高内聚 高复用 好处 ::每分钟可以实现数以百万的任务 特点: 使用消息队列(broker )在客户端和消费者之间协调 主体在消息队列 还有 协调 两端可以有多个 好的，现在说celery 的结构 Celery的架构由三部分组成，消息中间件（message broker），任务执行单元（worker

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This question already has an answer here: Why does my JavaScript get a “No 'Access-Control-Allow-Origin' header is present on the requested resource” error when Postman does not? 36 answers i have data in http://localhost:3000/edata [{"_id":"598705ac8f79380367e0a7f2","name":"prasad","age":"28","gender":"male","phone":8790440944},{"_id":"598733508f79380367e0a7f8","name":"ravi","age":"27","gender":"male","phone":"9912881777"} i want this data to be get when i run my client application i.e http://localhost:4200 app.module.ts import {

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: AggregateException is throwing while waiting for API post to complete how i could fix this? My API call is similar like this using (var httpClient = new HttpClient()) { httpClient.BaseAddress = new Uri(workflowUrl); var task = httpClient.PostAsJsonAsync("api/apiname/execute/", executeModel) .ContinueWith(x => x.Result.Content.ReadAsAsync<bool>().Result); Task continuation = task.ContinueWith(x => { bool response = x.Result; }); continuation.Wait(); } I am getting Exception given below while waitng for POST to complete. System

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: It's not a question but help to those who will find that the declaration of periodic tasks described in celery 4.0.1 documentation is hard to integrate in django: http://docs.celeryproject.org/en/latest/userguide/periodic-tasks.html#entries copy paste celery config file main_app/celery.py : from celery import Celery from celery.schedules import crontab app = Celery() @app.on_after_configure.connect def setup_periodic_tasks(sender, **kwargs): # Calls test('hello') every 10 seconds. sender.add_periodic_task(10.0, test.s('hello'), name='add

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to flip a boolean flag for particular types of objects in my database using sqlalchemy+celery beats. But how do I access my orm from the tasks.py file? from models import Book from celery.decorators import periodic_task from application import create_celery_app celery = create_celery_app() # Create celery: http://flask.pocoo.org/docs/0.10/patterns/celery/ # This task works fine @celery.task def celery_send_email(to,subject,template): with current_app.app_context(): msg = Message( subject, recipients=[to], html=template, sender

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am following a tutorial located here that uses Django Rest Framework , and I keep getting a weird error about a field. I have the following model in my models.py from django.db import models class Task(models.Model): completed = models.BooleanField(default=False) title = models.CharField(max_length=100) description = models.TextField() Then my serializer in serializers.py from rest_framework import serializers from task.models import Task class TaskSerializer(serializers.ModelSerializer): class Meta: model = Task fields = ('title',

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have the following function: getTasks: function() { var taskRequest = Titanium.Network.createHTTPClient(); var api_url = 'http://myawesomeapi.heroku.com/users/' + Ti.App.Properties.getString("userID") + '/tasks'; var tasks = []; taskRequest.onload = function() { var response = JSON.parse(this.responseText), len = response.length, i = 0, t; for(; i < len; i++) { task = response[i]; var newTask = {}; newTask.rowID = i; newTask.title = task.title; newTask.description = task.description; newTask.id = task.id; newTask.hasChild = true; tasks

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a tasks.json script that currently compiles the code { "version": "0.1.0", "command": "gcc", "isShellCommand": true, "args": ["-Wall", "${relativeFile}", "-o", "${relativeFile}.exe", "-pedantic"], "echoCommand": true, "showOutput": "always", "problemMatcher": { "owner": "cpp", "fileLocation": ["relative", "${workspaceRoot}"], "pattern": { "regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$", "file": 1, "line": 2, "column": 3, "severity": 4, "message": 5 } } } This works fine, but when I want to run the file I have to run the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Here is the logcat: 01-15 16:06:03.622: ERROR/AndroidRuntime(22300): Uncaught handler: thread main exiting due to uncaught exception 01-15 16:06:03.657: ERROR/AndroidRuntime(22300): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mohit.geo2do/com.mohit.geo2do.activities.TaskEdit}: java.lang.IllegalArgumentException: Invalid column due_date 01-15 16:06:03.657: ERROR/AndroidRuntime(22300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 01-15 16:06:03.657: ERROR/AndroidRuntime(22300): at

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm calling a task within a tasks in Django-Celery Here are my tasks. @shared_task def post_notification(data,url): url = "http://posttestserver.com/data/?dir=praful" # when in production, remove this line. headers = {'content-type': 'application/json'} requests.post(url, data=json.dumps(data), headers=headers) @shared_task def shipment_server(data,notification_type): notification_obj = Notification.objects.get(name = notification_type) server_list = ServerNotificationMapping.objects.filter(notification_name=notification_obj) for server in