quartz-scheduler | 易学教程

How to check whether Quartz cron job is running?

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问题 How to check if scheduled Quartz cron job is running or not? Is there any API to do the checking? 回答1: scheduler.getCurrentlyExecutingJobs() should work in most case. But remember not to use it in Job class, for it use ExecutingJobsManager(a JobListener) to put the running job to a HashMap, which run before the job class, so use this method to check job is running will definitely return true. One simple approach is to check that fire times are different: public static boolean isJobRunning

Java Quartz scheduled Job - disallow concurrent execution of Job

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I am using a Quartz Job for executing specific tasks. I am also scheduling its execution in my Main application class and what i am trying to accomplish is not to allow simultaneous instances of this job to be executed. So the scheduler should only execute the job if its previous instance is finished. Here is my Job class: public class MainJob implements Job { static Logger log = Logger.getLogger(MainJob.class.getName()); @Override public void execute(JobExecutionContext arg0) throws JobExecutionException { GlobalConfig cfg = new GlobalConfig(); ProcessDicomFiles processDicomFiles = new

Quartz scheduler in cluster environment

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问题 I am using SchedulerFactory schedulerFactory = new StdSchedulerFactory(); scheduler = schedulerFactory.getScheduler(); scheduler.start(); Trigger asapTrigger = getAsapTrigger(); JobDetail asapJob = getAsapJobDetails(); scheduler.scheduleJob(asapJob, asapTrigger); This is working but when I go for cluster environment, 2 threads are running for the same job. I am using annotations not properties file. I want to run only one thread. Can someone help on this. How to configure? my code almost look

Ensure that Spring Quartz job execution doesn't overlap

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I have a Java program that executes from Spring Qquartz every 20 seconds. Sometimes it takes just few seconds to execute, but as data gets bigger I'm sure it run for 20 seconds or more. How can I prevent Quartz from firing/triggering the job while one instance is still being executed? Firing 2 jobs performing same operations on a database would not be so good. Is there a way I can do some kind of synchronization? If all you need to do is fire every 20 seconds, Quartz is serious overkill. The java.util.concurrent.ScheduledExecutorService should be perfectly sufficient for that job. The

Unmanaged Threads Spring Quartz Websphere Hibernate

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问题 It appears that our implementation of using Quartz - JDBCJobStore along with Spring, Hibernate and Websphere is throwing unmanaged threads. I have done some reading and found a tech article from IBM stating that the usage of Quartz with Spring will cause that. They make the suggestion of using CommnonJ to address this issue. I have done some further research and the only examples I have seen so far all deal with the plan old JobStore that is not in a database. So, I was wondering if anyone

Quartz Java resuming a job excecutes it many times

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问题 For my application i create jobs and schedule them with CronTriggers. Each job has only one trigger and both the job name and the trigger names are the same. No jobs share a trigger. Now when i create a cron trigger like this "0/1 * * * * ?" which instructs the job to execute every second, it works just fine. The problem rises when i first pause the job by calling : scheduler.pauseJob(jobName, jobGroup); and then resuming the job after let's say 50 seconds with : scheduler.resumeJob(jobName,

Quartz: Cron expression that will never execute

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问题 I know there is a duplicate here, which probably is exactly my case, though it would deserve some better explanation, which I will try to provide here. I work with a Java web application using a Spring application context. In this context, I defined scheduled jobs using Quartz. These jobs are triggered by a cron defined in a .properties file. The Spring context is embedded within the war, while the .properties file is on the application server (Tomcat in this particular case). This is just

How to get and set a global object in Java servlet context

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问题 I wonder if anyone can advise: I have a scenario where a scheduled job being run by Quartz will update an arraylist of objects every hour. But I need this arraylist of objects to be visible to all sessions created by Tomcat. So what I'm thinking is that I write this object somewhere every hour from the Quartz job that runs so that each session can access it. Can anyone say how best this may be achieved? I was wondering about the object being written to servlet context from the Quartz job? The

Simple example for Quartz 2.2 and Tomcat 7

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问题 I want to create a scheduler with Quartz 2.2 in java dynamic web application. I am new to this task. I tried all the tutorials around the web. I trying context listener method to initialize the scheduler. It doesn't seem like working. The hello world program only works in general java application. for web application its looks tricky. pom.xml: <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org

How to change Spring's @Scheduled fixedDelay at runtime

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问题 I have a requirement to run a batch job at a fixed interval and have the ability to change the time of this batch job at runtime. For this I came across @Scheduled annotation provided under Spring framework. But I\'m not sure how I\'d change the value of fixedDelay at runtime. I did some googling around but didn\'t find anything useful. 回答1: You can use a Trigger to dynamically set the next execution time. See my answer here: Scheduling a job with Spring programmatically (with fixedRate set