男人的盟誓是女人的陷阱——莎士比亚
使用CompletableFuture进行异步任务编排时，可能会有事务的支持需求，我们这里可以使用之前我写的手动回滚、提交事务进行处理
代码案例如下，所用框架stream-query：
首先是不加事务的
代码语言：javascript复制package io.github.vampireachao.stream.plugin.mybatisplus;
import io.github.vampireachao.stream.plugin.mybatisplus.pojo.po.UserInfo;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import java.util.Objects;
import java.util.concurrent.CompletableFuture;
/**
* AsyncTest
*
* @author VampireAchao
* @since 2022/12/6
*/
@SpringBootTest
class AsyncTest {
@Test
@Transactional
void test(@Autowired ThreadPoolTaskExecutor executor) {
UserInfo userInfo = new UserInfo();
userInfo.setName("ruben");
Database.save(userInfo);
CompletableFuture.runAsync(() -> {
Assertions.assertNotNull(userInfo.getId(), "id is null");
Assertions.assertNotNull(Database.getById(userInfo.getId(), userInfo.getClass()), "user is null");
}, executor).join();
}
}此处会抛出assertNotNull，提示user is null
因为外部事务未提交，但内部默认事务没有设置为读未提交
修改后事务支持的代码：
代码语言：javascript复制package io.github.vampireachao.stream.plugin.mybatisplus;
import io.github.vampireachao.stream.plugin.mybatisplus.pojo.po.UserInfo;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.support.DefaultTransactionDefinition;
import org.springframework.transaction.support.TransactionTemplate;
import java.util.Objects;
import java.util.concurrent.CompletableFuture;
/**
* AsyncTest
*
* @author VampireAchao
* @since 2022/12/6
*/
@SpringBootTest
class AsyncTest {
@Test
@Transactional
void test(
@Autowired TransactionTemplate transactionTemplate,
@Autowired ThreadPoolTaskExecutor executor) {
UserInfo userInfo = new UserInfo();
userInfo.setName("ruben");
Database.save(userInfo);
CompletableFuture.runAsync(() -> {
PlatformTransactionManager transactionManager = Objects.requireNonNull(transactionTemplate.getTransactionManager());
DefaultTransactionDefinition transactionDefinition = new DefaultTransactionDefinition();
transactionDefinition.setIsolationLevel(TransactionDefinition.ISOLATION_READ_UNCOMMITTED);
TransactionStatus transactionStatus = transactionManager.getTransaction(transactionDefinition);
try {
Assertions.assertNotNull(userInfo.getId(), "id is null");
Assertions.assertNotNull(Database.getById(userInfo.getId(), userInfo.getClass()), "user is null");
transactionManager.commit(transactionStatus);
} catch (Throwable e) {
transactionManager.rollback(transactionStatus);
throw e;
}
}, executor).join();
}
}成功执行
