# 異步線程配置
# 配置核心線程數(shù)
async.executor.thread.core_pool_size = 30
# 配置最大線程數(shù)
async.executor.thread.max_pool_size = 30
# 配置隊列大小
async.executor.thread.queue_capacity = 99988
# 配置線程池中的線程的名稱前綴
async.executor.thread.name.prefix = async-importDB-

@Configuration
@EnableAsync
@Slf4j
public class ExecutorConfig {
    @Value("${async.executor.thread.core_pool_size}")
    private int corePoolSize;
    @Value("${async.executor.thread.max_pool_size}")
    private int maxPoolSize;
    @Value("${async.executor.thread.queue_capacity}")
    private int queueCapacity;
    @Value("${async.executor.thread.name.prefix}")
    private String namePrefix;
 
    @Bean(name = "asyncServiceExecutor")
    public Executor asyncServiceExecutor() {
        log.warn("start asyncServiceExecutor");
        //在這里修改
        ThreadPoolTaskExecutor executor = new VisiableThreadPoolTaskExecutor();
        //配置核心線程數(shù)
        executor.setCorePoolSize(corePoolSize);
        //配置最大線程數(shù)
        executor.setMaxPoolSize(maxPoolSize);
        //配置隊列大小
        executor.setQueueCapacity(queueCapacity);
        //配置線程池中的線程的名稱前綴
        executor.setThreadNamePrefix(namePrefix);
        // rejection-policy：當(dāng)pool已經(jīng)達(dá)到max size的時候，如何處理新任務(wù)
        // CALLER_RUNS：不在新線程中執(zhí)行任務(wù)，而是有調(diào)用者所在的線程來執(zhí)行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //執(zhí)行初始化
        executor.initialize();
        return executor;
    }
}

@Service
@Slf4j
public class AsyncServiceImpl implements AsyncService {
@Override
    @Async("asyncServiceExecutor")
    public void executeAsync(List<LogOutputResult> logOutputResults, LogOutputResultMapper logOutputResultMapper, CountDownLatch countDownLatch) {
        try{
            log.warn("start executeAsync");
            //異步線程要做的事情
            logOutputResultMapper.addLogOutputResultBatch(logOutputResults);
            log.warn("end executeAsync");
        }finally {
            countDownLatch.countDown();// 很關(guān)鍵, 無論上面程序是否異常必須執(zhí)行countDown,否則await無法釋放
        }
    }
}

@Override
public int testMultiThread() {
    List<LogOutputResult> logOutputResults = getTestData();
    //測試每100條數(shù)據(jù)插入開一個線程
    List<List<LogOutputResult>> lists = ConvertHandler.splitList(logOutputResults, 100);
    CountDownLatch countDownLatch = new CountDownLatch(lists.size());
    for (List<LogOutputResult> listSub:lists) {
        asyncService.executeAsync(listSub, logOutputResultMapper,countDownLatch);
    }
    try {
        countDownLatch.await(); //保證之前的所有的線程都執(zhí)行完成，才會走下面的；
        // 這樣就可以在下面拿到所有線程執(zhí)行完的集合結(jié)果
    } catch (Exception e) {
        log.error("阻塞異常:"+e.getMessage());
    }
    return logOutputResults.size();
}