[英]Interrupt spring scheduler task before next invocation
我有一個Spring-Boot應用程序,它將成為我們想要觸發的其他幾個進程的編排服務。 我目前使用Spring Scheduling設置動態從數據庫中提取crons。 我拋出了一個rest方法來觸發從數據庫中提取新的cron信息的過程。 這個邏輯都正常工作。 唯一的“問題”是它不會使用新的cron信息,直到下一次計划運行才能得到真正的問題。 有沒有辦法中斷當前觸發器並使用更新的cron信息再次安排一個觸發器。 以下是申請參考:
package com.bts.poc;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.TriggerContext;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import java.util.Date;
@SpringBootApplication
@EnableScheduling
@RestController
@RequestMapping("/APSCommon/Scheduling")
public class Application implements SchedulingConfigurer {
@Autowired
private DynamicCron dynamicCron;
@Autowired
PropertyManager propertyManager;
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class);
}
private String cronConfig() {
String cronTabExpression = propertyManager.getProperty("COMPANY", "JOB_NAME","CRON_EXPRESSION");
return cronTabExpression;
}
@Override
public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
taskRegistrar.addTriggerTask(new Runnable() {
@Override
public void run() {
dynamicCron.runJob();
}
}, new Trigger() {
@Override
public Date nextExecutionTime(TriggerContext triggerContext) {
String cron = cronConfig();
CronTrigger trigger = new CronTrigger(cron);
Date nextExec = trigger.nextExecutionTime(triggerContext);
DynamicCron.cronExpression = cron;
return nextExec;
}
});
}
@RequestMapping(value = "/reloadScheduling", method = RequestMethod.GET)
public String reloadScheduling() {
PropertyManager.setResetProperties(true);
return "schedules will be altered next run";
}
}
因此,使用SchedulingConfigurer-> configureTasks,您無法訪問我正在使用的Spring版本中的ScheduledFuture(4.2.7.RELEASE)。 從我讀過的幾篇文章中可以看出它是未來可能的功能。 我通過以下方式解決了這個問題:
package com.bts.poc;
import com.bts.poc.service.DynamicCron;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.MessageSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;
import java.util.TimeZone;
import java.util.concurrent.ScheduledFuture;
@SpringBootApplication(exclude = MessageSourceAutoConfiguration.class)
@EnableScheduling
@RestController
public class Application extends SpringBootServletInitializer {
@Autowired
private DynamicCron dynamicCron;
@Autowired
private PropertyManager propertyManager;
private static List<ScheduledFuture> scheduledFutures = new ArrayList<>();
private static final Logger LOGGER = LoggerFactory.getLogger(Application.class);
private static TaskScheduler scheduler;
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
}
private String cronConfig() {
return propertyManager.getProperty("COMPANY", "JOB_NAME", "CRON_EXPRESSION");
}
@RequestMapping(value = {"scheduling/start"}, method = RequestMethod.GET)
public @ResponseBody String startScheduling() {
scheduleAll();
LOGGER.info("Scheduling of jobs has been started.");
return "Scheduling of jobs has been started.";
}
@RequestMapping(value = {"scheduling/cancel"}, method = RequestMethod.GET)
public @ResponseBody String cancelScheduling() {
cancelAll();
LOGGER.info("Cancelling all scheduled jobs.");
return "Cancelling all scheduled jobs.";
}
private void scheduleAll() {
LOGGER.info("Scheduling all applications to run.");
cancelAll();
//eventually go through the database and load all jobs to be scheduled here.
schedule(cronConfig());
}
/**
* Cancel all the scheduled reports
*/
private void cancelAll() {
for (ScheduledFuture scheduledFuture : scheduledFutures) {
scheduledFuture.cancel(true);
}
scheduledFutures.clear();
}
/**
* Schedule the scheduled report with the given cron schedule information
*/
private void schedule(String cronSchedule) {
TimeZone tz = TimeZone.getDefault();
LOGGER.info("Setting up application {} to execute with cron string: '{}'.", cronSchedule);
CronTrigger trigger = new CronTrigger(cronSchedule, tz);
scheduler = scheduler();
if (scheduler == null) {
LOGGER.error("Unable to schedule job as scheduler was not found");
return;
}
ScheduledFuture<?> future = scheduler.schedule(new DynamicCron(), trigger);
scheduledFutures.add(future);
}
@Bean
public TaskScheduler scheduler() {
if (scheduler == null) {
ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
scheduler.setPoolSize(10);
scheduler.afterPropertiesSet();
}
return scheduler;
}
}
這基本上復制了ScheduledTaskRegistrar提供的功能,允許您管理ScheduledFuture。 希望這可以在將來幫助其他人。
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