log4j appender自定义_log4j routingappender_fileappender log4j(5)

12// maxFileSize more bytes are written

13nextRollover = size + maxFileSize;

14}

15LogLog.debug("maxBackupIndex=" + maxBackupIndex);

16

17boolean renameSucceeded = true;

18// If maxBackups <= 0, then there is no file renaming to be done.

19if (maxBackupIndex > 0) {

20// Delete the oldest file, to keep Windows happy.

21file = new File(fileName + &#39;.&#39; + maxBackupIndex);

22if (file.exists())

23renameSucceeded = file.delete();

24

25// Map {(maxBackupIndex - 1), , 2, 1} to {maxBackupIndex, , 3,

26// 2}

27for (int i = maxBackupIndex - 1; i >= 1 && renameSucceeded; i--) {

28file = new File(fileName + "." + i);

29if (file.exists()) {

30target = new File(fileName + &#39;.&#39; + (i + 1));

31LogLog.debug("Renaming file " + file + " to " + target);

32renameSucceeded = file.renameTo(target);

33}

34}

35

36if (renameSucceeded) {

37// Rename fileName to fileName.1

38target = new File(fileName + "." + 1);

39this.closeFile(); // keep windows happy.

40file = new File(fileName);

41LogLog.debug("Renaming file " + file + " to " + target);

42renameSucceeded = file.renameTo(target);

43//

44// if file rename failed, reopen file with append = true

45//

46if (!renameSucceeded) {

47try {

48this.setFile(fileName, true, bufferedIO, bufferSize);

49} catch (IOException e) {

50if (e instanceof InterruptedIOException) {

51Thread.currentThread().interrupt();

52}

53LogLog.error("setFile(" + fileName

54+ ", true) call failed.", e);

55}

56}

57}

58}

59

60//

61// if all renames were successful, then

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