log4j appender自定义_log4j routingappender_fileappender log4j(25)

1 protected long maxFileSize = 10 * 1024 * 1024;

2 protected int maxBackupIndex = 1;

3 private long nextRollover = 0;

4

5 public void rollOver() {

6File target;

7File file;

8if (qw != null) {

9long size = ((CountingQuietWriter) qw).getCount();

10LogLog.debug("rolling over count=" + size);

11// if operation fails, do not roll again until

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

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