Schedule jobs dynamically in Quartz by watching a folder - quartz-scheduler

Question

Scheduling jobs using code is easy, but I would like to schedule jobs based on contents of a folder.
For example:
I want the folder in "\MyApp\Jobs\" to contain some XML files that will have the information about the IJob to be scheduled.
The thing is that I want this folder to be watched for changes (for XML files) and when a new file is found, a new IJob will be schedule using the information contained in the XML.
What should I do to implement a mechanism like this?
Thanks

Answer 1

The class java.io.File has a few listFiles() methods which will list the contents of your directory. Use a FileFilter or FilenameFilter if you want to limit the filenames returned in some way. Do this in a loop with a "sleep", something like 60 seconds, to avoid chewing up all your CPU.
Hope this helps.

Answer 2

you dont need to watch for changes in file using file watcher.
while creating quartz property file it have option as
org.quartz.plugin.jobInitializer.scanInterval = 5
which scans for xml file changes.so in above case it scans every 5 seconds
my complete quartz.property file as follow
org.quartz.scheduler.instanceName = MyScheduler
org.quartz.threadPool.threadCount = 3
org.quartz.jobStore.class = org.quartz.simpl.RAMJobStore
org.quartz.plugin.jobInitializer.class =org.quartz.plugins.xml.XMLSchedulingDataProcessorPlugin
org.quartz.plugin.jobInitializer.fileNames =C:/Users/Admin/Documents/NetBeansProjects/QXmlTest/src/java/quartz-config.xml
org.quartz.plugin.jobInitializer.failOnFileNotFound =true
org.quartz.plugin.jobInitializer.scanInterval = 5
org.quartz.plugin.jobInitializer.wrapInUserTransaction= true
and i define jobs and trigger inside this quartz-config.xml file as follows :
<?xml version="1.0" encoding="UTF-8"?>
<job-scheduling-data
xmlns="http://www.quartz-scheduler.org/xml/JobSchedulingData"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.quartz-scheduler.org/xml/JobSchedulingData
http://www.quartz-scheduler.org/xml/job_scheduling_data_1_8.xsd"
version="1.8">
<schedule>
<job>
<name>AJob</name>
<group>AGroup</group>
<description>Print a welcome message</description>
<job-class>mypackage.SchedulerJob</job-class>
</job>
<trigger>
<cron>
<name>dummyTriggerName</name>
<job-name>AJob</job-name>
<job-group>AGroup</job-group>
<!-- It will run every 5 seconds -->
<cron-expression>0/5 * * * * ?</cron-expression>
</cron>
</trigger>
</schedule>
</job-scheduling-data>
Please note that i am using quartz java api.