REPORT-42043 fanruan.log无法分割-多线程问题

fine-log4j/src/main/java/com/fr/third/apache/log4j/DailyRollingFileAppender.java

@@ -320,6 +320,10 @@ public class DailyRollingFileAppender extends FileAppender {
       if (scheduledFilename.equals(datedFilename)) {
           return;
       }
+      synchronized (this) {
+          if (scheduledFilename.equals(datedFilename)) {
+              return;
+          }
 
           // close current file, and compress it to datedFilename
           this.closeFile();
@@ -372,12 +376,12 @@ public class DailyRollingFileAppender extends FileAppender {
               // This will also close the file. This is OK since multiple
               // close operations are safe.
               this.setFile(fileName, true, this.bufferedIO, this.bufferSize);
-    }
-    catch(IOException e) {
+          } catch (IOException e) {
               errorHandler.error("setFile(" + fileName + ", true) call failed.");
           }
           scheduledFilename = datedFilename;
       }
+  }
 
 
     /**