Don't start QuartzSchedulerThread in QuartzScheduler constructor

[ruanwenjun]

Hi team,

Right now, I have two server, one is a web, and another is worker.
The web server is used to CRUD Job and bind Trigger to Job, the worker server is used to execute the Job. Due to some reason, I cannot execute Job in portal server.

I use QuartzScheduler to CRUD Job and bind Trigger in web server, so I just initialize QuartzScheduler and don't execute the QuartzScheduler's start method.

I find quartz will start the QuartzSchedulerThread in QuartzScheduler 's constructor. This seems not needed, if the QuartzScheduler doesn't start, the QuartzSchedulerThread seems only block in a loop

while (paused && !halted.get()) {
    try {
        // wait until togglePause(false) is called...
        sigLock.wait(1000L);
    } catch (InterruptedException ignore) {
    }

    // reset failure counter when paused, so that we don't
    // wait again after unpausing
    acquiresFailed = 0;
}

[rohan-naik07]

@ruanwenjun can we add the schedThreadExecutor.execute(this.schedThread); line in the start method of the QuartzScheduler class?

[ruanwenjun]

@ruanwenjun can we add the schedThreadExecutor.execute(this.schedThread); line in the start method of the QuartzScheduler class?

LGTM, if we can move the execute method move to start.

[jhouserizer]

On initial cursory look, probably safe. I think (at least) past versions of the code relied upon the thread running even when used the way the poster describes - thus probably worth a closer look before any change is made.