scheduling

问题 I just want that my program or method should run at specific date and time. i have heard about Timer and TimerTask in java API. But don't know exactly how to use it. 回答1: If you want to run a java program at a specific time you probably want to look at the OS tools (like cron or at). If you want to run a method inside of an already running java application then the ScheduleExecutorService, while it may be overkill, is pretty easy to use. 回答2: If this is for your own benefit and not for a

问题 I want a mechanism that will start a java program ( quite a big one ) depending on 2 conditions: N new inserts in a MySQL table Every 5 minutes interval. I know that I can do this through crontab or using Timer or using Stored Procedure etc. My plan is to write a Java class ( I am most familiar with ), Listener having two threads in parallel - Database Listener and Time listener threads each of them monitoring one of these conditions. If one says, yes, the parent class will start a new thread

问题 Hi everyone, I need to schedule my python files(which contains data extraction from sql and some joins) using airflow. I have successfully installed airflow into my linux server and webserver of airflow is available with me. But even after going through documentation I am not clear where exactly I need to write script for scheduling and how will that script be available into airflow webserver so I could see the status As far as the configuration is concerned I know where the dag folder is

问题 I asked few days ago, a question about how to transform a University Class Scheduling Problem into a Boolean Satisfiability Problem. (Class Scheduling to Boolean satisfiability [Polynomial-time reduction]) I got an answer by @Amit who was very elegant and easy to code. Basically, his answer was like this : instead of considering courses, he considered time-intervals. So for the i-th course, he just indicted all the possible intervals for this course. And we obtain a solution when there is at

问题 Title sums it up, I know little about how I will do this. See also: PHP: running scheduled jobs (cron jobs) 回答1: Have you ever looked at ATrigger? A PHP library is also available to create scheduled tasks without overhead. Disclaimer: I'm among their team. 回答2: The best method for scheduled tasks is beanstalkd with delayed put. 回答3: Use your operating system's scheduled tasks facility. crontab on unix, scheduled tasks on windows. Then we have some more considerations: Do you want to schedule

问题 I am currently revising for an exam and have come across a question that I am really not sure of. 1) Produce a clearly labeled diagram indicating the THREE states a process can take in a single-processor multitasking operating system. This question im okay on (i think) my understanding is that a process state can be any of the states bellow. And a process will change its state as it gets passed around into different queues during its life cycle. The question I ama having issues with is. 2)

问题 I am new to vb scripting. I need to schedule a windows task which can run a vbs file. The script opens up a application from its shortcut, feeds username and password and performs login. In other words, I need to automate the restart process. The scripts runs as expected when opened manually but scheduler cannot not run it. I think the problem is with those UI elements(used for login). Please suggest how to get through it. Thank you! 回答1: AppActivate does not itself restore the window if it

问题 I have 3 threads in my program t1 reads a frame1 of data and writes it onto a hard disk t2 reads a frame2 of data and writes it onto a hard disk t2 reads a frame3 of data and writes it onto a hard disk When the program runs, and t1 t2 and t3 are scheduled for execution one by one, how are the operations performed internally? Ex: say t1 -> t2 -> t3 get scheduled in this order Scenario 1: will t1 finish one full cycle of read frame1 and write frame1 before t2 is scheduled and whether t2

问题 I am using whenever gem in my application. And i have scheduled a rake task every 5 minutes. But that rake task is not running every 5 minutes. When i saw the log it gave me error like `to_specs': Could not find bundler (>= 0) amongst [bigdecimal-1.1.0, io-console-0.3, json-1.5.4, minitest-2.5.1, rake-0.9.2.2, rdoc-3.9.4] (Gem::LoadError) this is the content in schedule.rb every 3.minutes do rake "mytask name" end 回答1: I had same issue solved by putting env :PATH, '/bin:/sbin:/usr/bin:/usr

问题 I'm using k8 v1.7 and Python Client v2.0. My custom scheduler detects a pending pod and schedules it successfully. However, after assigning a pod to a node, it complains that the pod is already assigned to a node though it is just assigned by the scheduler itself. Is this something to be concerned? Or how can I fix this? Error Message create_namespaced_binding: (409) Reason: Conflict HTTP response headers: HTTPHeaderDict({'Date': 'Tue, 19 Jun 2018 16:14:57 GMT', 'Content-Length': '289',