有一种替代方法,不依赖于特定的连接池库或特定的数据库。请注意,您需要使用 spring-retry
来实现此方法的预期行为。
首先,您需要将 spring-retry
添加到您的依赖项中:
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
<version>${spring-retry.version}</version>
</dependency>
然后,您可以创建一个 DataSource
装饰器, 继承 AbstractDataSource
, 如下所示 :
@Slf4j
@RequiredArgsConstructor
public class RetryableDataSource extends AbstractDataSource {
private final DataSource dataSource;
@Override
@Retryable(maxAttempts = 5, backoff = @Backoff(multiplier = 1.3, maxDelay = 10000))
public Connection getConnection() throws SQLException {
log.info("getting connection ...");
return dataSource.getConnection();
}
@Override
@Retryable(maxAttempts = 5, backoff = @Backoff(multiplier = 2.3, maxDelay = 10000))
public Connection getConnection(String username, String password) throws SQLException {
log.info("getting connection by username and password ...");
return dataSource.getConnection(username, password);
}
}
那么您需要通过创建一个自定义的 BeanPostProcessor
,将这个自定义的 DataSource 装饰器注入到 Spring 上下文中:
@Slf4j
@Order(value = Ordered.HIGHEST_PRECEDENCE)
@Component
public class RetryableDatabasePostProcessor implements BeanPostProcessor {
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if(bean instanceof DataSource) {
log.info("-----> configuring a retryable datasource for beanName = {}", beanName);
return new RetryableDataSource((DataSource) bean);
}
return bean;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
return bean;
}
}
最后,您需要通过在Spring主类中添加
@EnableRetry
注解来启用Spring Retry功能,例如:
@EnableRetry
@SpringBootApplication
public class RetryableDbConnectionApplication {
public static void main(String[] args) {
SpringApplication.run(RetryableDbConnectionApplication.class, args);
}
}