定时调度，
每天23点执行一次：0 0 23 * * ?
设置总开关，根据配置表增加数据，判断是否调用存储过程，并行执行存储过程。执行成功后修改配置表；定时更新数据，并保留轨迹；获取异步方法返回值
CompletableFuture是对Feature的增强，Feature只能处理简单的异步任务，而CompletableFuture可以将多个异步任务进行复杂的组合。如下：
@RestController
public class AsyncController {
@Autowired
private AsyncService asyncService;
@SneakyThrows
@ApiOperation("异步 有返回值")
@GetMapping("/open/somethings")
public String somethings() {
CompletableFuture<String> createOrder = asyncService.doSomething1("create order");
CompletableFuture<String> reduceAccount = asyncService.doSomething2("reduce account");
CompletableFuture<String> saveLog = asyncService.doSomething3("save log");
// 等待所有任务都执行完
CompletableFuture.allOf(createOrder, reduceAccount, saveLog).join();
// 获取每个任务的返回结果
String result = createOrder.get() + reduceAccount.get() + saveLog.get();
return result;
}
}
@Slf4j
@Service
public class AsyncService {
@Async("doSomethingExecutor")
public CompletableFuture<String> doSomething1(String message) throws InterruptedException {
log.info("do something1: {}", message);
Thread.sleep(1000);
return CompletableFuture.completedFuture("do something1: " + message);
}
@Async("doSomethingExecutor")
public CompletableFuture<String> doSomething2(String message) throws InterruptedException {
log.info("do something2: {}", message);
Thread.sleep(1000);
return CompletableFuture.completedFuture("; do something2: " + message);
}
@Async("doSomethingExecutor")
public CompletableFuture<String> doSomething3(String message) throws InterruptedException {
log.info("do something3: {}", message);
Thread.sleep(1000);
return CompletableFuture.completedFuture("; do something3: " + message);
}
}
访问
C:\Users\Administrator>curl -X GET “http://localhost:8200/open/somethings” -H “accept: /”do something1: create order; do something2: reduce account; do something3: save log
C:\Users\Administrator>curl -X GET "http://localhost:8200/open/somethings" -H "accept: */*"
do something1: create order; do something2: reduce account; do something3: save log
控制台上关键日志如下：2020-04-20 00:27:42.238
INFO 5672 --- [ do-something-3] x.gits.boot.system.service.AsyncService
: do something3: save log
2020-04-20 00:27:42.238
INFO 5672 --- [ do-something-2] x.gits.boot.system.service.AsyncService
: do something2: reduce account
2020-04-20 00:27:42.238
INFO 5672 --- [ do-something-1] x.gits.boot.system.service.AsyncService
: do something1: create order
注意事项@Async注解会在以下几个场景失效，也就是说明明使用了@Async注解，但就没有走多线程。 异步方法使用static关键词修饰；
异步类不是一个Spring容器的bean（一般使用注解@Component和@Service，并且能被Spring扫描到）；
SpringBoot应用中没有添加@EnableAsync注解；
在同一个类中，一个方法调用另外一个有@Async注解的方法，注解不会生效。原因是@Async注解的方法，是在代理类中执行的。
需要注意的是：异步方法使用注解@Async的返回值只能为void或者Future及其子类，当返回结果为其他类型时，方法还是会异步执行，但是返回值都是null，
@Async实际还是通过Future或CompletableFuture来异步执行的，Spring又封装了一下，让我们使用的更方便。 参考
https://blog.csdn.net/zhanglu0223/article/details/110392403
线程池使用：SpringBoot应用中需要添加@EnableAsync注解，来开启异步调用，一般还会配置一个线程池，异步的方法交给特定的线程池完成，如下：@Configuration
@EnableAsync
public class AsyncConfiguration {
@Bean("doSomethingExecutor")
public Executor doSomethingExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
// 核心线程数：线程池创建时候初始化的线程数
executor.setCorePoolSize(10);
// 最大线程数：线程池最大的线程数，只有在缓冲队列满了之后才会申请超过核心线程数的线程
executor.setMaxPoolSize(20);
// 缓冲队列：用来缓冲执行任务的队列
executor.setQueueCapacity(500);
// 允许线程的空闲时间60秒：当超过了核心线程之外的线程在空闲时间到达之后会被销毁
executor.setKeepAliveSeconds(60);
// 线程池名的前缀：设置好了之后可以方便我们定位处理任务所在的线程池
executor.setThreadNamePrefix("do-something-");
// 缓冲队列满了之后的拒绝策略：由调用线程处理（一般是主线程）
executor.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardPolicy());
executor.initialize();
return executor;
}
}
使用的方式非常简单，在需要异步的方法上加@Async注解@RestController
public class AsyncController {
@Autowired
private AsyncService asyncService;
@GetMapping("/open/something")
public String something() {
int count = 10;
for (int i = 0; i < count; i++) {
asyncService.doSomething("index = " + i);
}
lon
return "success";
}
}
@Slf4j
@Service
public class AsyncService {
// 指定使用beanname为doSomethingExecutor的线程池
@Async("doSomethingExecutor")
public String doSomething(String message) {
log.info("do something, message={}", message);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
log.error("do something error: ", e);
}
return message;
}
}
访问：127.0.0.1:8080/open/something，日志如下2020-04-19 23:42:42.486
INFO 21168 --- [io-8200-exec-17] x.g.b.system.controller.AsyncController
: do something end, time 8 milliseconds
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-1] x.gits.boot.system.service.AsyncService
: do something, message=index = 0
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-5] x.gits.boot.system.service.AsyncService
: do something, message=index = 4
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-4] x.gits.boot.system.service.AsyncService
: do something, message=index = 3
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-6] x.gits.boot.system.service.AsyncService
: do something, message=index = 5
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-9] x.gits.boot.system.service.AsyncService
: do something, message=index = 8
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-8] x.gits.boot.system.service.AsyncService
: do something, message=index = 7
2020-04-19 23:42:42.488
INFO 21168 --- [do-something-10] x.gits.boot.system.service.AsyncService
: do something, message=index = 9
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-7] x.gits.boot.system.service.AsyncService
: do something, message=index = 6
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-2] x.gits.boot.system.service.AsyncService
: do something, message=index = 1
2020-04-19 23:42:42.488
INFO 21168 --- [ do-something-3] x.gits.boot.system.service.AsyncService
: do something, message=index = 2
附：1、基本用法
curl http://www.ald8.cntelnet 192.168.27.129 66ping 127.0.0.1
curl
https://blog.csdn.net/cbuy888/article/details/106823347