[英]When does this @Scheduled(cron = "0 0 0/24 * * ?") get called?
[英]How to start @scheduled cron only when method is explicitly called?
默认情况下,@ Scheduled会在运行时自动启动,即使不显式调用该方法也是如此。
我希望仅在我显式调用该方法时才能启动cron计时器,因此可以在我的代码中看到:
@GetMapping("/checkstatus")
public void getExistingTransaction(@RequestBody String uniq_id){
//get Existing Transaction using uniq_id:
//cases: uniq_id found, uniq_id not found:
//if uniq_id is found: Find Transaction by uniq_id
if(transactionRepository.findByUniqueId(uniq_id) != null){
//if uniq id exists and found: perform checking cron:
testCron(); //<-- this is the cron method.
}
}
这是Cron方法的实现:
//helper:
@Scheduled(cron = "*/10 * * * * *")
private void testCron() {
long currentTime = System.currentTimeMillis() / 1000;
logger.info("Transaction exists and cron stuff workz" + currentTime);
}
我的问题是: 无论何时满足业务逻辑,如何控制它的执行以及如何停止它?
您可以使用started
标志:
private boolean started = false;
private void startCron() {
started = true;
}
private void stopCron() {
started = false;
}
@Scheduled(cron = "*/10 * * * * *")
private void testCron() {
if (!started) {
return;
}
//...
}
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