以下代码复制了该问题。
测试A类:
package main.java.monitor;
import javax.ejb.Schedule;
import javax.ejb.Singleton;
@Singleton
public class TestA {
@Schedule(hour="*", minute="*", second="*")
public void run() {
System.out.println("Test A started");
System.out.println("Test A finished");
}
}
测试B类:
package main.java.monitor;
import javax.ejb.Schedule;
import javax.ejb.Singleton;
@Singleton
public class TestB {
@Schedule(hour="*", minute="*", second="*")
public void run() throws InterruptedException {
System.out.println("Test B started");
Thread.sleep(10000);
System.out.println("Test B finished");
}
}
预期输出(类似)将是测试 A 开始、测试 A 完成的频率是测试 B 开始和测试 B 完成的 10 倍,但实际输出是(添加日期/时间):
Test A started Tue Feb 03 13:09:47 GMT 2015
Test A finished Tue Feb 03 13:09:47 GMT 2015
Test B started Tue Feb 03 13:09:47 GMT 2015
Test A started Tue Feb 03 13:09:48 GMT 2015
Test A finished Tue Feb 03 13:09:48 GMT 2015
Test A started Tue Feb 03 13:09:49 GMT 2015
Test A finished Tue Feb 03 13:09:49 GMT 2015
Test B finished Tue Feb 03 13:09:57 GMT 2015
Test B started Tue Feb 03 13:09:57 GMT 2015
Test A started Tue Feb 03 13:09:58 GMT 2015
Test A finished Tue Feb 03 13:09:58 GMT 2015
Test B finished Tue Feb 03 13:10:07 GMT 2015
Test B started Tue Feb 03 13:10:07 GMT 2015
Test A started Tue Feb 03 13:10:08 GMT 2015
Test A finished Tue Feb 03 13:10:08 GMT 2015
有谁能解释一下吗?
提前致谢
最佳答案
我想您会很清楚地在 EJB 上添加 @AccessTimeout(0)
用2个字来说:默认情况下,单例是@Lock(WRITE),B正在锁定(每秒执行一次,但等待10)。一旦异步池已满(默认为 3 个线程),则不再有可用线程,并且调用正在等待 B 释放一个槽。
关于java - 一个应用程序中的两个单例 - 都具有不同的 @Scheduled 方法 - 一个类方法等待另一个?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28299837/