序

本文主要研究一下PowerJob的CleanService

CleanService@Slf4j@Servicepublic class CleanService {

private final DFsService dFsService;private final InstanceInfoRepository instanceInfoRepository;private final WorkflowInstanceInfoRepository workflowInstanceInfoRepository;private final WorkflowNodeInfoRepository workflowNodeInfoRepository;private final LockService lockService;private final int instanceInfoRetentionDay;private final int localContainerRetentionDay;private final int remoteContainerRetentionDay;private static final int TEMPORARY_RETENTION_DAY = 3;/*** 每天凌晨3点定时清理*/
private static final String CLEAN_TIME_EXPRESSION = "0 0 3 * * ?";private static final String HISTORY_DELETE_LOCK = "history_delete_lock";public CleanService(DFsService dFsService, InstanceInfoRepository instanceInfoRepository, WorkflowInstanceInfoRepository workflowInstanceInfoRepository,WorkflowNodeInfoRepository workflowNodeInfoRepository, LockService lockService,@Value("${oms.instanceinfo.retention}") int instanceInfoRetentionDay,@Value("${oms.container.retention.local}") int localContainerRetentionDay,@Value("${oms.container.retention.remote}") int remoteContainerRetentionDay) {this.dFsService = dFsService;this.instanceInfoRepository = instanceInfoRepository;this.workflowInstanceInfoRepository = workflowInstanceInfoRepository;this.workflowNodeInfoRepository = workflowNodeInfoRepository;this.lockService = lockService;this.instanceInfoRetentionDay = instanceInfoRetentionDay;this.localContainerRetentionDay = localContainerRetentionDay;this.remoteContainerRetentionDay = remoteContainerRetentionDay;
}//......

}

CleanService提供了timingClean、cleanLocal方法timingClean@Async(PJThreadPool.TIMING_POOL)@Scheduled(cron = CLEAN_TIME_EXPRESSION)public void timingClean() {

    // 释放本地缓存WorkerClusterManagerService.cleanUp();// 释放磁盘空间cleanLocal(OmsFileUtils.genLogDirPath(), instanceInfoRetentionDay);cleanLocal(OmsFileUtils.genContainerJarPath(), localContainerRetentionDay);cleanLocal(OmsFileUtils.genTemporaryPath(), TEMPORARY_RETENTION_DAY);// 删除数据库历史的数据cleanByOneServer();
}

timingClean先执行WorkerClusterManagerService.cleanUp()释放本地缓存，之后通过cleanLocal释放本地磁盘空间，最后执行cleanByOneServer删除历史数据cleanLocal@VisibleForTestingpublic void cleanLocal(String path, int day) {if (day < 0) {log.info("[CleanService] won't clean up {} because of offset day <= 0.", path);return;}

    Stopwatch stopwatch = Stopwatch.createStarted();File dir = new File(path);if (!dir.exists()) {return;}File[] logFiles = dir.listFiles();if (logFiles == null || logFiles.length == 0) {return;}// 计算最大偏移量long maxOffset = day * 24 * 60 * 60 * 1000L;for (File f : logFiles) {long offset = System.currentTimeMillis() - f.lastModified();if (offset >= maxOffset) {if (!f.delete()) {log.warn("[CleanService] delete file({}) failed.", f.getName());}else {log.info("[CleanService] delete file({}) successfully.", f.getName());}}}log.info("[CleanService] clean {} successfully, using {}.", path, stopwatch.stop());
}

cleanByOneServer

    private void cleanByOneServer() {// 只要第一个server抢到锁其他server就会返回，所以锁10分钟应该足够了boolean lock = lockService.tryLock(HISTORY_DELETE_LOCK, 10 * 60 * 1000L);if (!lock) {log.info("[CleanService] clean job is already running, just return.");return;}try {// 删除数据库运行记录cleanInstanceLog();cleanWorkflowInstanceLog();// 删除无用节点cleanWorkflowNodeInfo();// 删除 GridFS 过期文件cleanRemote(Constants.LOG_BUCKET, instanceInfoRetentionDay);cleanRemote(Constants.CONTAINER_BUCKET, remoteContainerRetentionDay);} finally {lockService.unlock(HISTORY_DELETE_LOCK);}}

cleanByOneServer先加锁，然后执行cleanInstanceLog、cleanWorkflowInstanceLog、cleanWorkflowNodeInfo等

小结

PowerJob的CleanService提供了timingClean、cleanLocal方法，其中timingClean先执行WorkerClusterManagerService.cleanUp()释放本地缓存，之后通过cleanLocal释放本地磁盘空间，最后执行cleanByOneServer删除历史数据；cleanLocal会删除指定目录中lastModified距离当前时间大于等于1天的文件。

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