fix并发情况下server端删除日志时数据已经被其他server删除的问题

powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/persistence/mongodb/GridFsManager.java

@@ -1,6 +1,7 @@
 package com.github.kfcfans.powerjob.server.persistence.mongodb;
 
 import com.github.kfcfans.powerjob.server.common.PowerJobServerConfigKey;
+import com.github.kfcfans.powerjob.server.service.lock.LockService;
 import com.google.common.base.Stopwatch;
 import com.google.common.collect.Maps;
 import com.mongodb.client.MongoDatabase;
@@ -38,6 +39,8 @@ public class GridFsManager implements InitializingBean {
 
     @Resource
     private Environment environment;
+    @Resource
+    private LockService lockService;
 
     private MongoDatabase db;
     private boolean available;
@@ -107,9 +110,22 @@ public class GridFsManager implements InitializingBean {
      * @param day 日期偏移量，单位 天
      */
     public void deleteBefore(String bucketName, int day) {
+        String deleteFsLock = "deleteFsLock";
+        // 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.lock(deleteFsLock, 10 * 60 * 1000);
+        if (!lock) {
+            log.info("[GridFsManager] deleted task is running, it's ok to return.");
+            return;
+        }
+        try{
+            deleteHistoryFile(bucketName, day);
+        }finally {
+            lockService.unlock(deleteFsLock);
+        }
+    }
 
+    private void deleteHistoryFile(String bucketName, int day) {
         Stopwatch sw = Stopwatch.createStarted();
-
         Date date = DateUtils.addDays(new Date(), -day);
         GridFSBucket bucket = getBucket(bucketName);
         Bson filter = Filters.lt("uploadDate", date);