/** Test initializing the last position in the logs. */
public void testSetLastPosition() throws DatabaseException {
/*
* Pretend that the last file is file 79.
*/
fileManager.setLastPosition( // next available LSN
DbLsn.makeLsn(79L, 88L), DbLsn.makeLsn(79L, 77), 66L);
/* Put an entry down, should fit within file 79. */
fileManager.bumpLsn(11L);
assertEquals(DbLsn.makeLsn(79L, 88L), fileManager.getLastUsedLsn());
assertEquals(77L, fileManager.getPrevEntryOffset());
/* Put another entry in, should go to the next file. */
fileManager.bumpLsn(22L);
assertEquals(
DbLsn.makeLsn(80L, FileManager.firstLogEntryOffset()), fileManager.getLastUsedLsn());
assertEquals(0, fileManager.getPrevEntryOffset());
}
/** Test LSN administration. */
public void testLsnBumping() throws Exception {
/*
We are adding these entries:
+----+------+---------+--------+
file 0: |hdr | 30 | 50 |empty |
+----+------+---------+--------+
0 hdr hdr+30 hdr+80 99
+----+--------+-------+-------+-----+-------+
file 1: |hdr | 40 | 20 | 10 | 5 | empty |
+----+--------+-------+-------+-----+-------+
0 hdr hdr+40 hdr+60 hdr+70 hdr+75
+-----+-----+--------+
file 2: | hdr | 75 | empty |
+-----+-----+--------+
0 hdr hdr+75
+-----+-------------------------------+
file 3: | hdr | 125 |
+-----+-------------------------------+
0 hdr
+-----+-----+------+-----+--------------+
file 4: | hdr | 10 | 20 | 30 | empty
+-----+-----+------+-----+--------------+
0 hdr hdr+10 hdr+30
*/
try {
/* Should start out at LSN 0. */
/* "add" some entries to the log. */
long hdrSize = FileManager.firstLogEntryOffset();
fileManager.bumpLsn(30L);
/* Item placed here. */
assertEquals(DbLsn.makeLsn(0, hdrSize), fileManager.getLastUsedLsn());
/* prev entry. */
assertEquals(0, fileManager.getPrevEntryOffset());
fileManager.bumpLsn(50L);
/* Item placed here. */
assertEquals(DbLsn.makeLsn(0, (hdrSize + 30)), fileManager.getLastUsedLsn());
assertEquals(hdrSize, fileManager.getPrevEntryOffset());
/* bump over to a file 1. */
fileManager.bumpLsn(40L);
/* item placed here. */
assertEquals(DbLsn.makeLsn(1, hdrSize), fileManager.getLastUsedLsn());
assertEquals(0, fileManager.getPrevEntryOffset());
fileManager.bumpLsn(20L);
/* Item placed here. */
assertEquals(DbLsn.makeLsn(1, (hdrSize + 40)), fileManager.getLastUsedLsn());
assertEquals(hdrSize, fileManager.getPrevEntryOffset());
fileManager.bumpLsn(10L);
/* Item placed here. */
assertEquals(DbLsn.makeLsn(1, (hdrSize + 60)), fileManager.getLastUsedLsn());
assertEquals(hdrSize + 40, fileManager.getPrevEntryOffset());
fileManager.bumpLsn(5L);
/* item placed here. */
assertEquals(DbLsn.makeLsn(1, (hdrSize + 70)), fileManager.getLastUsedLsn());
assertEquals(hdrSize + 60, fileManager.getPrevEntryOffset());
/* bump over to file 2. */
fileManager.bumpLsn(75L);
/* Item placed here. */
assertEquals(DbLsn.makeLsn(2, hdrSize), fileManager.getLastUsedLsn());
assertEquals(0, fileManager.getPrevEntryOffset());
/* Ask for something bigger than a file: bump over to file 3. */
fileManager.bumpLsn(125L);
/* item placed here. */
assertEquals(DbLsn.makeLsn(3, hdrSize), fileManager.getLastUsedLsn());
assertEquals(0, fileManager.getPrevEntryOffset());
/* bump over to file 4. */
fileManager.bumpLsn(10L);
/* Item placed here. */
assertEquals(DbLsn.makeLsn(4, hdrSize), fileManager.getLastUsedLsn());
assertEquals(0, fileManager.getPrevEntryOffset());
fileManager.bumpLsn(20L);
/* Item placed here. */
assertEquals(DbLsn.makeLsn(4, (hdrSize + 10)), fileManager.getLastUsedLsn());
assertEquals(hdrSize, fileManager.getPrevEntryOffset());
fileManager.bumpLsn(30L);
/* Item placed here. */
assertEquals(DbLsn.makeLsn(4, (hdrSize + 30)), fileManager.getLastUsedLsn());
assertEquals((hdrSize + 10), fileManager.getPrevEntryOffset());
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}
