quartz-scheduler | 易学教程

How to run every 25 seconds in Quartz scheduler?

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I am using the Quartz Scheduling API for Java. Could you help me to run every 25 seconds using cron-expression. It's just a delay. It does not have to start always at second 0. For example, the sequence is like this: 0:00, 0:25, 0:50, 1:15, 1:40, 2:05, etc until minute 5 when the sequence begins again at second 0. Thank you. I don't think cron expression will allow you to do that, but you can use SimpleScheduleBuilder.repeatSecondlyForever( 25 ) as 300 (5 minutes) is a multiple of 25 it will repeat automatically. If you want a job to trigger at a regular interval then you can use a Quartz

Using Quartz to Schedule Single Job Across Multiple Stateless App Servers

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问题 I have a layer of identical app servers behind a load balancer. For operational reasons I have the constraint that the application configuration on both app servers must be identical so that nodes can easily be added and removed. All app servers share the same database. App servers are not/will not be clustered. This has worked fine until now, but now I would like to have a scheduled job that executes on exactly one of the app servers. All app servers will run Quartz and have the same

Update an existing JobDataMap

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问题 I have a Quartz job that has already been scheduled. I want to update the JobDataMap associated with it. If I get a JobDataMap with JobDataMap jobDataMap = scheduler.getJobDetail(....).getJobDataMap() , is that map "live"? ie. if I change it, will it be persisted in the scheduler? If not, how do I persist it? 回答1: See http://www.quartz-scheduler.org/docs/tutorial/TutorialLesson03.html: A Job instance can be defined as "stateful" or "non-stateful". Non-stateful jobs only have their JobDataMap

Integration of tomcat and Quartz scheduler on startup

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问题 I am using tomcat version 6.0. My requirement is that when tomcat starts up, I would like to start a QuartzScheduler which will schedule some jobs at a regular interval. I am trying to figure out the best possible way to do it. Here are the options that I could think of - I can do this via a servlet with " load-on-startup " descriptor in web.xml file to start the scheduler and schedule the jobs inside the servlet. Can be done using a ContextListener (this sounds a better approach to me than 1

Add multiple triggers to single quartz job

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I want to dynamically add triggers to a job, but can't find any helpful methods off of Scheduler I though i would just be able to call the scheduleJob method an repetitively, but this gives me tthe ObjectAlreadyExists Exception "because one already exists with this identification". How can i do this? EDIT private boolean scheduleLoadJob( XfuScheduleTimeInfo time ) { LoadScheduleJob job = new LoadScheduleJob( time ); JobDetail detail; Integer id = Integer.valueOf( time.getScheduleId() ); if( _hashMap.containsKey( id ) ) { detail = _hashMap.get( Integer.valueOf( time.getScheduleId() ) ); } else

What does BLOCKED state mean for Quartz trigger

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问题 For some Quartz job, it misfired; and after checked the trigger status in database, it shows BLOCKED . What does this BLOCKED mean specifically? 回答1: Perhaps some search would help before posting a question here? WAITING = the normal state of a trigger, waiting for its fire time to arrive and be acquired for firing by a scheduler. PAUSED = means that one of the scheduler.pauseXXX() methods was used. The trigger is not eligible for being fired until it is resumed. ACQUIRED = a scheduler node

spring batch vs quartz jobs?

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I am new to batch processing. I am trying to start with simple scheduler and job. But i am confused b/w spring batch vs quartz jobs. My understanding is Quartz :- quartz provides both frameworks i.e scheduler framework and job framework(in case I do not want to use spring batch jobs). Right ? Spring Batch :- It only provides the job framework . I have always send using Quatz schecduler to schedule spring batch jobs. Does spring provides its own scheduler also ? Quartz is a scheduling framework. Like "execute something every hour or every last friday of the month" Spring Batch is a framework

Quartz vs. ScheduledExecutorService in Java web application

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For a system monitoring Java application which currently runs on the command line and uses ScheduledExecutorService , I would like to write a simple web application version, to be run in a Servlet container like Apache Tomcat or Eclipse Jetty . I have read about Quartz as one of the popular job schedulers for web applications. Would it be better (maybe because of better servlet container integration) to port this application from ScheduledExecutorService to Quartz? Adding another library dependency to the application is not a problem, I am interested in technical reasons against usage of

Difference between Quartz Job and Scheduling Tasks with Spring?

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问题 I am new to Spring-boot(version 1.3.6) and Quartz and I am wondering what is the difference between making a task with Spring-scheduler: @Scheduled(fixedRate = 40000) public void reportCurrentTime() { System.out.println("Hello World"); } And the Quartz way: 0. Create sheduler. 1. Job which implements Job interface. 2. Create JobDetail which is instance of the job using the builder org.quartz.JobBuilder.newJob(MyJob.class) 3. Create a Triger 4. Finally set the job and the trigger to the

How to pass instance variables into Quartz job?

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问题 I wonder how to pass an instance variable externally in Quartz? Below is pseudo code I would like to write. How can I pass externalInstance into this Job? public class SimpleJob implements Job { @Override public void execute(JobExecutionContext context) throws JobExecutionException { float avg = externalInstance.calculateAvg(); } } 回答1: you can put your instance in the schedulerContext.When you are going to schedule the job ,just before that you can do below: getScheduler().getContext().put(