java - Spring @Async 传播上下文信息
问题描述
我有一个 Spring Boot 2.2 应用程序。我创建了这样的服务:
@Async
@PreAuthorize("hasAnyRole('ROLE_PBX')")
@PlanAuthorization(allowedPlans = {PlanType.BUSINESS, PlanType.ENTERPRISE})
public Future<AuditCdr> saveCDR(Cdr3CXDto cdrRecord) {
log.debug("Current tenant {}", TenantContext.getCurrentTenantId());
return new AsyncResult<AuditCdr>(auditCdrRepository.save(cdr3CXMapper.cdr3CXDtoToAuditCdr(cdrRecord)));
}
这是我的@Async 配置:
@Configuration
@EnableAsync
public class AsyncConfiguration implements AsyncConfigurer {
@Override
public Executor getAsyncExecutor() {
SecurityContextHolder.setStrategyName(SecurityContextHolder.MODE_INHERITABLETHREADLOCAL);
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(2);
executor.setMaxPoolSize(10);
executor.setQueueCapacity(500);
executor.setThreadNamePrefix("threadAsync");
executor.setWaitForTasksToCompleteOnShutdown(true);
executor.initialize();
return executor;
}
}
使用SecurityContextHolder.MODE_INHERITABLETHREADLOCAL
我看到安全上下文被传递给 @Async 方法。在我的多租户应用程序中,我使用 ThreadLocal 来设置租户的 ID:
public class TenantContext {
public final static String TENANT_DEFAULT = "empty";
private static final ThreadLocal<String> code = new ThreadLocal<>();
public static void setCurrentTenantId(String code) {
if (code != null)
TenantContext.code.set(code);
}
public static String getCurrentTenantId() {
String tenantId = code.get();
if (StringUtils.isNotBlank(tenantId)) {
return tenantId;
}
return TENANT_DEFAULT;
}
public static void clear() {
code.remove();
}
}
因为 ThreadLocal 与线程相关,所以在 @Async 方法中是不可用的。此外,我的自定义@PlanAuthorization
aop 需要它来执行租户计划的验证。是否有一种干净的方法可以在我的应用程序的任何 @Async 方法中设置 TenantContext?
解决方案
我最终使用了TaskDecorator:
@Log4j2
public class MdcTaskDecorator implements TaskDecorator {
@Override
public Runnable decorate(Runnable runnable) {
// Right now: Web thread context !
// (Grab the current thread MDC data)
String tenantId = TenantContext.getCurrentTenantId();
Long storeId = StoreContext.getCurrentStoreId();
SecurityContext securityContext = SecurityContextHolder.getContext();
Map<String, String> contextMap = MDC.getCopyOfContextMap();
log.info("Saving tenant information for async thread...");
return () -> {
try {
// Right now: @Async thread context !
// (Restore the Web thread context's MDC data)
TenantContext.setCurrentTenantId(tenantId);
StoreContext.setCurrentStoreId(storeId);
SecurityContextHolder.setContext(securityContext);
MDC.setContextMap(contextMap);
log.info("Restoring tenant information for async thread...");
runnable.run();
} catch (Throwable e) {
log.error("Error in async task", e);
} finally {
MDC.clear();
}
};
}
}
我以这种方式使用它:
@Configuration
@EnableAsync
public class AsyncConfiguration implements AsyncConfigurer {
@Override
public Executor getAsyncExecutor() {
SecurityContextHolder.setStrategyName(SecurityContextHolder.MODE_INHERITABLETHREADLOCAL);
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(1);
executor.setMaxPoolSize(100);
executor.setQueueCapacity(500);
executor.setThreadNamePrefix("threadAsync");
executor.setWaitForTasksToCompleteOnShutdown(true);
executor.setTaskDecorator(new MdcTaskDecorator());
executor.initialize();
return executor;
}
}
它有效,而且似乎也是一个巧妙的解决方案。
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