Terdapat kira-kira tiga cara untuk melaksanakan log modul:
AOP + pelaksanaan anotasi tersuai
Keluarkan log format yang ditentukan + pelaksanaan pengimbasan log
Dalam antara muka, melalui pencerobohan kod, selepas logik perniagaan diproses, kaedah dipanggil untuk merekodkan log.
Di sini kita membincangkan kaedah pelaksanaan ketiga.
Andaikan kita perlu melaksanakan operasi merekod log masuk selepas pengguna log masuk.
Hubungan panggilan adalah seperti berikut:
Kod teras di sini ditetapkan dalam kaedah LoginService.login() untuk dilaksanakan selepas transaksi tamat:
// 指定事务提交后执行 TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronization() { // 不需要事务提交前的操作,可以不用重写这个方法 @Override public void beforeCommit(boolean readOnly) { System.out.println("事务提交前执行"); } @Override public void afterCommit() { System.out.println("事务提交后执行"); } });
Di sini, kami merangkum kod ini ke dalam kelas alat, rujukan: 4.TransactionUtils.
Jika transaksi didayakan dalam kaedah LoginService.login() dan tidak dinyatakan selepas transaksi diserahkan, akan ada masalah dengan kaedah pemprosesan log tak segerak dan transaksi baharu:
Melakukan secara tak segerak: Memandangkan transaksi utama mungkin tidak selesai, maklumat data yang baru ditambah atau diubah suai dalam transaksi utama mungkin tidak dibaca; boleh menggunakan Propagation .REQUIRES_NEW gelagat penyebaran transaksi untuk mencipta transaksi baharu dan melaksanakan operasi pengelogan dalam transaksi baharu boleh menyebabkan masalah berikut:
Jika ia dihidupkan Jika transaksi baharu beroperasi; jadual yang sama seperti transaksi sebelumnya, ia akan menyebabkan jadual dikunci.
@RestController public class LoginController { @Autowired private LoginService loginService; @RequestMapping("/login") public String login(String username, String pwd) { loginService.login(username, pwd); return "succeed"; } }
/** * <p> @Title Action * <p> @Description 自定义动作函数式接口 * * @author ACGkaka * @date 2023/4/26 13:55 */ public interface Action { /** * 执行动作 */ void doSomething(); }
import org.springframework.transaction.support.TransactionSynchronization; import org.springframework.transaction.support.TransactionSynchronizationManager; /** * <p> @Title TransactionUtils * <p> @Description 事务同步工具类 * * @author ACGkaka * @date 2023/4/26 13:45 */ public class TransactionUtils { /** * 提交事务前执行 */ public static void beforeTransactionCommit(Action action) { TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronization() { @Override public void beforeCommit(boolean readOnly) { // 异步执行 action.doSomething(); } }); } /** * 提交事务后异步执行 */ public static void afterTransactionCommit(Action action) { TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronization() { @Override public void afterCommit() { // 异步执行 action.doSomething(); } }); } }
@Service public class LoginService { @Autowired private LoginLogService loginLogService; /** 登录 */ @Transactional(rollbackFor = Exception.class) public void login(String username, String pwd) { // 用户登录 // TODO: 实现登录逻辑.. // 事务提交后执行 TransactionUtil.afterTransactionCommit(() -> { // 异步执行 taskExecutor.execute(() -> { // 记录日志 loginLogService.recordLog(username); }); }); } }
6.LoginLogService
@Service public class LoginLogService { /** 记录日志 */ @Async @Transactional(rollbackFor = Exception.class) public void recordLog(String username) { // TODO: 实现记录日志逻辑... } }
import com.demo.async.ContextCopyingDecorator; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.task.TaskExecutor; import org.springframework.scheduling.annotation.EnableAsync; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; import java.util.concurrent.ThreadPoolExecutor; /** * <p> @Title AsyncTaskExecutorConfig * <p> @Description 异步线程池配置 * * @author ACGkaka * @date 2023/4/24 19:48 */ @EnableAsync @Configuration public class AsyncTaskExecutorConfig { /** * 核心线程数(线程池维护线程的最小数量) */ private int corePoolSize = 10; /** * 最大线程数(线程池维护线程的最大数量) */ private int maxPoolSize = 200; /** * 队列最大长度 */ private int queueCapacity = 10; @Bean public TaskExecutor taskExecutor() { ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor(); executor.setCorePoolSize(corePoolSize); executor.setMaxPoolSize(maxPoolSize); executor.setQueueCapacity(queueCapacity); executor.setThreadNamePrefix("MyExecutor-"); // for passing in request scope context 转换请求范围的上下文 executor.setTaskDecorator(new ContextCopyingDecorator()); // rejection-policy:当pool已经达到max size的时候,如何处理新任务 // CALLER_RUNS:不在新线程中执行任务,而是有调用者所在的线程来执行 executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy()); executor.setWaitForTasksToCompleteOnShutdown(true); executor.initialize(); return executor; } }
import org.slf4j.MDC; import org.springframework.core.task.TaskDecorator; import org.springframework.security.core.context.SecurityContext; import org.springframework.security.core.context.SecurityContextHolder; import org.springframework.web.context.request.RequestAttributes; import org.springframework.web.context.request.RequestContextHolder; import java.util.Map; /** * <p> @Title ContextCopyingDecorator * <p> @Description 上下文拷贝装饰者模式 * * @author ACGkaka * @date 2023/4/24 20:20 */ public class ContextCopyingDecorator implements TaskDecorator { @Override public Runnable decorate(Runnable runnable) { try { // 从父线程中获取上下文,然后应用到子线程中 RequestAttributes requestAttributes = RequestContextHolder.currentRequestAttributes(); Map<String, String> previous = MDC.getCopyOfContextMap(); SecurityContext securityContext = SecurityContextHolder.getContext(); return () -> { try { if (previous == null) { MDC.clear(); } else { MDC.setContextMap(previous); } RequestContextHolder.setRequestAttributes(requestAttributes); SecurityContextHolder.setContext(securityContext); runnable.run(); } finally { // 清除请求数据 MDC.clear(); RequestContextHolder.resetRequestAttributes(); SecurityContextHolder.clearContext(); } }; } catch (IllegalStateException e) { return runnable; } } }
import org.springframework.transaction.support.TransactionSynchronization; import org.springframework.transaction.support.TransactionSynchronizationManager; @Service public class LoginService { @Autowired private LoginLogService loginLogService; @Qualifier("taskExecutor") @Autowired private TaskExecutor taskExecutor; /** 登录 */ @Transactional(rollbackFor = Exception.class) public void login(String username, String pwd) { // 用户登录 // TODO: 实现登录逻辑.. // 事务提交后执行 TransactionUtil.afterTransactionCommit(() -> { // 异步执行 taskExecutor.execute(() -> { // 记录日志 loginLogService.recordLog(username); }); }); } }
import org.springframework.transaction.support.TransactionTemplate; @Service public class LoginService { @Autowired private LoginLogService loginLogService; @Autowired private TransactionTemplate transactionTemplate; /** 登录 */ public void login(String username, String pwd) { // 用户登录 transactionTemplate.execute(status->{ // TODO: 实现登录逻辑.. }); // 事务提交后异步执行 taskExecutor.execute(() -> { // 记录日志 loginLogService.recordLog(username); }); } }
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