scheduler

How can threads of execution be running concurrently when there is a thread scheduler?

烂漫一生 提交于 2019-12-02 07:49:31
问题 From the definitions I've been reading: threads are basically pieces of code that are running concurrently (at the same time) . However how can they be running concurrently with the existence of a thread scheduler? I read that the thread scheduler basically chooses randomly a thread to run at a certain moment from the pool of Runnable threads. From that i got that at a precise point of time, only one runnable thread is truly in the run state(running). ( all of this is from SCJP Sun Certified

use removeAll() in scheduler task

喜欢而已 提交于 2019-12-02 07:19:50
Before doing new stuff, i want my scheduler-Task to remove all entries from the database, the execute-function looks like that: public function execute() { $objectManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\CMS\Extbase\Object\ObjectManager'); $jobRepository = $objectManager->get('\TYPO3\MyExtension\Domain\Repository\JobRepository'); //clear DB $jobRepository->removeAll(); (...)//insert new entries to DB $objectManager->get('TYPO3\CMS\Extbase\Persistence\PersistenceManagerInterface')->persistAll(); return true; } inserting new entries to the DB works fine, but clearing

Can a JOB be created dynamically inside a trigger?

天涯浪子 提交于 2019-12-02 06:52:30
问题 The execution of this trigger fails (it compiles but once I do the specified insert -> error) create or replace TRIGGER AFT_INSERT_TMP_TBL AFTER INSERT ON TMP_TBL REFERENCING OLD AS OLD NEW AS NEW FOR EACH ROW DECLARE V_SQL VARCHAR2(1000); A_NAME VARCHAR2(100); BEGIN A_NAME:='ANY_NAME'; V_SQL:='BEGIN DBMS_SCHEDULER.CREATE_JOB ( job_name => '''||A_NAME||''', job_type => ''PLSQL_BLOCK'', job_action => ''BEGIN DBMS_OUTPUT.PUT_LINE('||A_NAME||'); END;'', start_date => TIMESTAMP''2011-12-4 10:30

Disable a Spring Scheduler Task via Property

那年仲夏 提交于 2019-12-01 21:26:55
问题 I am scheduling a task using Spring Framework and have a cron value set through an environment specific property file. I am looking for a way to disable this task through a property so that only certain environments run this task. <task:scheduled-tasks> <task:scheduled ref="theClass" method="theMethod" cron="${scheduler.cron}" /> </task:scheduled-tasks> <bean id="theClass" class="com.test.TheClass" scope="prototype" /> 回答1: You can use Spring environment profiles (example using annotations,

Configuring Quartz.Net to stop a job from executing, if it is taking longer than specified time span

随声附和 提交于 2019-12-01 21:08:39
I am working on making a scheduler, just like Windows Scheduler using Quartz.Net. In Windows Scheduler, there is an option to stop a task from running if it takes more than the specified time. I have to implement the same in my scheduler. But I am not able to find any extension method/setting to configure Trigger or Job accordingly. I request some inputs or suggestions for it. You can write small code to set a custom timout running on another thread. Implement IInterruptableJob interface and make a call to its Interrupt() method from that thread when the job should be interrupted. You can

Disable a Spring Scheduler Task via Property

扶醉桌前 提交于 2019-12-01 21:07:50
I am scheduling a task using Spring Framework and have a cron value set through an environment specific property file. I am looking for a way to disable this task through a property so that only certain environments run this task. <task:scheduled-tasks> <task:scheduled ref="theClass" method="theMethod" cron="${scheduler.cron}" /> </task:scheduled-tasks> <bean id="theClass" class="com.test.TheClass" scope="prototype" /> You can use Spring environment profiles (example using annotations , example using xml ), so you can have different profiles for development, testing, production, etc. And these

Is there a way to schedule a task at a specific time or with an interval?

好久不见. 提交于 2019-12-01 17:57:16
Is there a way to run a task in rust, a thread at best, at a specific time or in an interval again and again? So that I can run my function every 5 minutes or every day at 12 o'clock. In Java there is the TimerTask, so I'm searching for something like that. You can use Timer::periodic to create a channel that gets sent a message at regular intervals, e.g. use std::old_io::Timer; let mut timer = Timer::new().unwrap(); let ticks = timer.periodic(Duration::minutes(5)); for _ in ticks.iter() { your_function(); } Receiver::iter blocks, waiting for the next message, and those messages are 5 minutes

Is there a way to schedule a task at a specific time or with an interval?

给你一囗甜甜゛ 提交于 2019-12-01 17:51:24
问题 Is there a way to run a task in rust, a thread at best, at a specific time or in an interval again and again? So that I can run my function every 5 minutes or every day at 12 o'clock. In Java there is the TimerTask, so I'm searching for something like that. 回答1: You can use Timer::periodic to create a channel that gets sent a message at regular intervals, e.g. use std::old_io::Timer; let mut timer = Timer::new().unwrap(); let ticks = timer.periodic(Duration::minutes(5)); for _ in ticks.iter()

Go scheduler and CGO: Please explain this difference of behavior?

风格不统一 提交于 2019-12-01 13:00:54
I'd like to know the implementation reason for this: package main func main() { c := make(chan struct{}) go func() { print("a") for { } }() go func() { print("b") for { } }() go func() { print("c") c <- struct{}{} for { } }() <-c } ❯❯❯ GOMAXPROCS=2 go run sample1.go ab <--- blocks. package main // static void loop() { for(;;); } import "C" func main() { c := make(chan struct{}) go func() { print("a") C.loop() print("x") }() go func() { print("b") C.loop() print("y") }() go func() { print("c") c <- struct{}{} C.loop() print("z") }() <-c } ❯❯❯ GOMAXPROCS=2 go run sample2.go abc <--- ends

Understanding renice

落花浮王杯 提交于 2019-12-01 11:42:58
问题 I'm trying to give an CPU-bound application the lowest scheduling priority with renice 19 (Linux 3.11). However, it doesn't seem to work as expected or I have an understanding problem. Let me describe two ways how I've tried it. I expected that in both ways I'd get the same results, but I don't. Consider the application loop to be a busy loop: int main() { for(;;) ; return 0; } . Experiment 1 opened a terminal ran ./loop & as many times as CPUs (eg, I have 4 CPUs). ran a further instance of