quartz-scheduler | 易学教程

Quartz job triggering from Config.groovy

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I have the following Quartz job running in my application: class ScraperJob { def scraperService static triggers = { cron name: 'scraperTrigger', cronExpression: "0 0 * * * ?" // run every minute } def execute(){ try { scraperService.storing() log.info "${new Date()} - Scraping went smoothly." } catch(IOException) { // Connexion problem log.error "${new Date()} - Method: parsing >> Connexion down or interrupted while parsing !" } catch(SAXException) { // Any SAXParser exception log.error "${new Date()} - Method: parsing >> Parser error." } finally { // if not closed, the application crashes

Correct way to persist Quartz triggers in database

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问题 I'm quite new to Quartz and now I need to schedule some jobs in Spring web application. I know about Spring + Quartz integration (I'm using Spring v 3.1.1) but I'm wondering if this is the right way to follow. In particular I need to persist my scheduled tasks in a DB so I can re-initialize them when application is restarted. Are there some utilities provided by Spring scheduling wrapper to do this? Can you suggest me some "well known" approach to follow? 回答1: Here is one way I handle this

delete trigger in quartz

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问题 Is there a way to delete a scheduled trigger with a specific job? It seems that only way to delete a trigger is to delete the whole job and then re-register the job and trigger. I've a job which can potentially have 100+ triggers and I really don't want to delete the job and re-register all the triggers when I just have to delete 1 trigger. Also, is there a way to stop the scheduler from executing the job as soon as the trigger is configured? Thanks 回答1: try scheduler.unscheduleJob this

Pros and cons of using java.util.timer vs Quartz for scheduling? [closed]

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问题 I've got to write an app that performs a series of tasks: task to be run once at 0200 hours every day. task to be run once at 0400 hours ever day task to be run at 15 minute intervals starting at 0003 hours task to be run at 15 minute intervals starting at 0005 hours What are the pros and cons of using plain java.util.timer Vs. Quartz for this? Are there any other alternatives I should be considering? 回答1: Quartz Additional dependency API currently (late 2011) changing: 1.x on its way out,

How to use @Autowired in a Quartz Job?

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问题 i am using quartz with spring and i want to inject/use another class in the job class and i don't know how to do it correctly the xml: <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">  <bean name="schedulerTask" class="com.mkyong.quartz.SchedulerTask" />

Finding all classes implementing a specific interface [duplicate]

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问题 This question already has an answer here: Find Java classes implementing an interface [duplicate] 9 answers I am in the process of developing an application (Quartz scheduler) where we have a job class which is responsible for actually executing the work and we need to tell/pass the name of the job class while creating a trigger in the Quartz scheduler. I want to provide an extension point to all who want to use the API (beside the some generic jobs which I will provide as part of the API).

Verifying a cron expression is valid in Java

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I'm writing a scheduling application in Java using Quartz. I'm using the CronTrigger, but my cron expressions are entered into a database before they are scheduled and are based on user input. Is there a way I can verify that the cron expressions are valid when I capture them? I'd rather do this and give the user an appropriate error message than wait until the scheduler is run and I get a ParseException when I try and create the trigger. Which could be days after the user inputs the data. Can't you simply create a trigger without actually executing it? You could simply give appropriate

Spring Scheduling: @Scheduled vs Quartz

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问题 I'm reading the Spring 3.0 docs regarding scheduling. I'm leaning towards Spring's JobDetailBean for Quartz. However, the @Scheduled annotation has captured my eye. It appears this is another way of scheduling task using the Spring Framework. Based on the docs, Spring provides three way of scheduling: @Scheduled Via Quartz Via JDK Timer I have no interest in the JDK Timer. Why should I choose @Scheduled over Quartz? (When I mention Quartz I mean using Spring's bean wrapper for Quartz). Let's

An enterprise scheduler for python (like quartz)

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问题 I am looking for an enterprise tasks scheduler for python, like quartz is for Java. Requirements: Persistent: if the process restarts or the machine restarts, then all the jobs must stay there and must be fired after restarting. Jobs must enter and exit the scheduler in a transaction (i.e. if some database operation fail, in a database unrelated to the scheduler, then the job must not have exited or entered the scheduler). Scalability. Depends on the measure of success of the project, but I

Cron Expression (Quartz) for a program to run every midnight at 12 am

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问题 What is the cron expression in Quartz Scheduler to run a program at 12 am every midnight GMT. I have never used quartz before so I am still learning. Is the expression 0 0 12 * * ? or is that for 12 pm (noon) . Could anyone tell me? 回答1: 1 Seconds 2 Minutes 3 Hours 4 Day-of-Month 5 Month 6 Day-of-Week 7 Year (optional field) So in your case: 0 0 0 * * ? This will fire at midnight, if you want to fire at noon: 0 0 12 * * ? Or both: 0 0 0,12 * * ? A good page if you want to get more complicated